Updated ParticleEmitters and Factories

CHANGELOG.md

@@ -16,6 +16,7 @@ und diese Projekt folgt [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ## Changed
 - Die Methoden in `Validator` erwarten nun als zweiten Parameter den Namen des Parameters, der geprüft wird.
 - `DrawingLayer.image(...)` mit Größenänderung umbenannt zu `imageScale(...)`.
+- Klassen in `schule.ngb.zm.util.io` werfen nun nur eine Warnung ohne Stack-Trace, wenn die Ressource nicht gefunden werden konnte.
 
 ## Fixed
 - `Constants.choice(int...)` und `Constants.choice(double...)` wiederhergestellt.

build.gradle

@@ -1,10 +1,11 @@
 plugins {
 	id 'idea'
     id 'java-library'
+	id 'org.hidetake.ssh' version '2.10.1'
 }
 
 group 'schule.ngb'
-version '0.0.34-SNAPSHOT'
+version '0.0.35-SNAPSHOT'
 
 java {
 	withSourcesJar()
@@ -19,6 +20,15 @@ repositories {
     mavenCentral()
 }
 
+remotes {
+	uberspace {
+		host = 'westphal.uberspace.de'
+		user = 'ngb'
+		identity = file("${System.properties['user.home']}/.ssh/uberspace_rsa")
+		knownHosts = allowAnyHosts
+	}
+}
+
 dependencies {
     runtimeOnly 'com.googlecode.soundlibs:jlayer:1.0.1.4'
 	runtimeOnly 'com.googlecode.soundlibs:tritonus-share:0.3.7.4'
@@ -92,6 +102,52 @@ task buildDocs {
 	dependsOn 'mkdocs'
 }
 
+task zipSite(type: Zip) {
+	group "documentation"
+	description "Create zip archives for documentations"
+
+	dependsOn 'mkdocs'
+
+	from fileTree("${buildDir}/docs/site")
+	exclude '*.py'
+	exclude '__pycache__'
+	archiveName 'site.zip'
+	destinationDir(file("${buildDir}/docs"))
+}
+
+task zipJavadoc(type: Zip) {
+	group "documentation"
+	description "Create zip archives for javadoc"
+
+	dependsOn 'javadoc'
+
+	from fileTree("${buildDir}/docs/javadoc")
+	archiveName 'javadoc.zip'
+	destinationDir(file("${buildDir}/docs"))
+}
+
+task uploadDocs {
+	group "documentation"
+	description "Run all documentation tasks and upload artifacts to zeichenmaschine.xyz"
+
+	dependsOn 'zipSite'
+	dependsOn 'zipJavadoc'
+
+	doLast {
+		ssh.run {
+			session(remotes.uberspace) {
+				execute 'rm -rf /var/www/virtual/ngb/zeichenmaschine.xyz/*', ignoreError: true
+
+				put from: "${buildDir}/docs/site.zip", into: '/var/www/virtual/ngb/zeichenmaschine.xyz', ignoreError: true
+				execute 'unzip -o -q /var/www/virtual/ngb/zeichenmaschine.xyz/site.zip -d /var/www/virtual/ngb/zeichenmaschine.xyz'
+
+				put from: "${buildDir}/docs/javadoc.zip", into: '/var/www/virtual/ngb/zeichenmaschine.xyz', ignoreError: true
+				execute 'unzip  -o -q /var/www/virtual/ngb/zeichenmaschine.xyz/javadoc.zip -d /var/www/virtual/ngb/zeichenmaschine.xyz/docs'
+			}
+		}
+	}
+}
+
 test {
 	useJUnitPlatform()
 }

docs/schnellstart.md

@@ -57,7 +57,7 @@ erstellt und in einem Fenster mit dem Titel „Shapes“ angezeigt.
 
 ### Formen zeichnen
 
-Eine Zeichenmaschine hat verschiedene Möglichkeiten, Inhalte in das
+Eine Zeichenmaschine hat verschiedene Möglichkeiten Inhalte in das
 Zeichenfenster zu zeichnen. Um ein einfaches statisches Bild zu erzeugen,
 überschreiben wir die {{ jdl("schule.ngb.zm.Zeichenmaschine", "draw()",
 c=False) }} Methode.
@@ -146,7 +146,7 @@ Im Beispiel setzen wir nun die Grundeinstellungen in der `setup()` Methode. In
 ## Interaktionen mit der Maus: Whack-a-mole
 
 Mit der Zeichenmaschine lassen sich Interaktionen mit der Maus leicht umsetzen.
-Wor wollen das Beispielprogramm zu einem
+Wir wollen das Beispielprogramm zu einem
 [Whac-A-Mole](https://de.wikipedia.org/wiki/Whac-A-Mole) Spiel erweitern.
 
 Auf der Zeichenfläche wird nur noch ein gelber Kreis an einer zufälligen Stelle
@@ -219,7 +219,7 @@ aber auch abnehmen und stellt eine Methode dafür bereit
 Um auf einen Mausklick zu reagieren, ergänzen wir die
 {{ jdm("Zeichenmaschine", "mouseClicked()") }} Methode:
 
-```
+```java
 @Override
 public void mouseClicked() {
 	if( distance(moleX, moleY, mouseX, mouseY) < moleRadius ) {
@@ -290,8 +290,8 @@ angeklickt wird.
 ## Ein paar Details zur Zeichenmaschine
 
 Die _Zeichenmaschine_ wurde stark von der kreativen Programmierumgebung
-[Processing](https://processing.org) inspiriert. Wenn Du Processing schon
-kennst, dann werden Dir einige der Konzepte der _Zeichenmaschine_ schon bekannt
+[Processing](https://processing.org) inspiriert. Wenn du Processing schon
+kennst, dann werden dir einige der Konzepte der _Zeichenmaschine_ schon bekannt
 vorkommen.
 
 ### Farben
@@ -392,14 +392,14 @@ Sekunde aufgerufen wird. Normalerweise passiert dies genau 60-mal pro Sekunde.
 ### Lebenszeit eines Kreises
 
 Jeder Kreis soll drei Sekunden zu sehen sein. Daher fügen wir eine neue
-Objektvariable namens `moleTime` ein, die zunächst auf drei steht. Da wir auch
-Bruchteile von Skeunden abziehen wollen, wählen wir als Datentyp `double`:
+Objektvariable namens `moleTime` ein, die zunächst auf Drei steht. Da wir auch
+Bruchteile von Sekunden abziehen wollen, wählen wir als Datentyp `double`:
 
 ```Java
 private double moleTime=3.0;
 ```
 
-Der Parameter `delta`, der `update()` Methode ist der Zeitraum in Sekunden, seit
+Der Parameter `delta` der `update()` Methode ist der Zeitraum in Sekunden seit
 dem letzten Frame. Subtrahieren wir diesen Wert bei jedem Frame von `moleTime`,
 wird der Wert immer kleiner. Dann müssen wir nur noch prüfen, ob er kleiner Null
 ist und in dem Fall den Kreis auf eine neue Position springen lassen.
@@ -489,7 +489,7 @@ drawing.circle(moleX,moleY,moleRadius*(moleTime/3.0));
 
 ### Punktezähler
 
-Zum Schluss wollen wir noch bei jedem Treffer mit der Maus die Punkte Zählen und
+Zum Schluss wollen wir noch bei jedem Treffer mit der Maus die Punkte zählen und
 als Text auf die Zeichenfläche schreiben.
 
 Dazu ergänzen wir eine weitere Objektvariable `score`, die in `mouseClicked()`
@@ -589,18 +589,18 @@ drawing.setFillColor(BLACK);
 
 ## Wie es weitergehen kann
 
-In diesem Schnellstart-Tutorial hast Du die Grundlagen der _Zeichenmaschine_
-gelernt. Um weiterzumachen, kannst Du versuchen, das Whack-a-mole Spiel um diese
+In diesem Schnellstart-Tutorial hast du die Grundlagen der _Zeichenmaschine_
+gelernt. Um weiterzumachen, kannst du versuchen, das Whack-a-mole Spiel um diese
 Funktionen zu erweitern:
 
 - Mehrere "Maulwürfe" gleichzeitig.
 - Unterschiedliche Zeiten pro Maulwurf.
 
-Wenn Du mehr über die Möglichkeiten lernen möchtest, die Dir die
-_Zeichenmaschine_ bereitstellt, kannst Du Dir die weiteren Tutorials in dieser
+Wenn du mehr über die Möglichkeiten lernen möchtest, die dir die
+_Zeichenmaschine_ bereitstellt, kannst du dir die weiteren Tutorials in dieser
 Dokumentation ansehen. Ein guter Startpunkt ist das
 [Aquarium](tutorials/aquarium/aquarium1.md).
 
-Viele verschiedene Beispiele, ohne detailliertes Tutorial, findest Du in der
+Viele verschiedene Beispiele, ohne detailliertes Tutorial, findest du in der
 Kategorie Beispiele und auf GitHub im Repository
 [jneug/zeichenmaschine-examples](https://github.com/jneug/zeichenmaschine-examples).

src/main/java/schule/ngb/zm/BasicDrawable.java

@@ -34,6 +34,11 @@ public abstract class BasicDrawable extends Constants implements Strokeable, Fil
 	 */
 	protected Options.StrokeType strokeType = SOLID;
 
+	/**
+	 * Die Art der Kantenverbindungen von Linien.
+	 */
+	protected Options.StrokeJoin strokeJoin = MITER;
+
 	/**
 	 * Cache für den aktuellen {@code Stroke} der Kontur. Wird nach Änderung
 	 * einer der Kontureigenschaften auf {@code null} gesetzt und beim nächsten
@@ -53,6 +58,7 @@ public abstract class BasicDrawable extends Constants implements Strokeable, Fil
 	 */
 	protected MultipleGradientPaint fill = null;
 
+	// TODO: Add TexturePaint fill (https://docs.oracle.com/javase/8/docs//api/java/awt/TexturePaint.html)
 
 	// Implementierung Drawable Interface
 
@@ -154,7 +160,7 @@ public abstract class BasicDrawable extends Constants implements Strokeable, Fil
 	@Override
 	public Stroke getStroke() {
 		if( stroke == null ) {
-			stroke = Strokeable.createStroke(strokeType, strokeWeight);
+			stroke = Strokeable.createStroke(strokeType, strokeWeight, strokeJoin);
 		}
 		return stroke;
 	}
@@ -191,4 +197,15 @@ public abstract class BasicDrawable extends Constants implements Strokeable, Fil
 		this.stroke = null;
 	}
 
+	@Override
+	public Options.StrokeJoin getStrokeJoin() {
+		return strokeJoin;
+	}
+
+	@Override
+	public void setStrokeJoin( Options.StrokeJoin join ) {
+		strokeJoin = join;
+		this.stroke = null;
+	}
+
 }

src/main/java/schule/ngb/zm/Constants.java

@@ -11,6 +11,7 @@ import java.awt.event.MouseEvent;
 import java.awt.image.BufferedImage;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.List;
 import java.util.Random;
 import java.util.function.DoubleUnaryOperator;
 
@@ -67,7 +68,7 @@ public class Constants {
 	/**
 	 * Patchversion der Zeichenmaschine.
 	 */
-	public static final int APP_VERSION_REV = 34;
+	public static final int APP_VERSION_REV = 35;
 
 	/**
 	 * Version der Zeichenmaschine als Text-String.
@@ -170,6 +171,21 @@ public class Constants {
 	 */
 	public static final Options.StrokeType DOTTED = Options.StrokeType.DOTTED;
 
+	/**
+	 * Option für abgerundete Kantenverbindungen von Konturen und Linien.
+	 */
+	public static final Options.StrokeJoin ROUND = Options.StrokeJoin.ROUND;
+
+	/**
+	 * Option für abgeschnittene Kantenverbindungen von Konturen und Linien.
+	 */
+	public static final Options.StrokeJoin BEVEL = Options.StrokeJoin.BEVEL;
+
+	/**
+	 * Option für eckige Kantenverbindungen von Konturen und Linien.
+	 */
+	public static final Options.StrokeJoin MITER = Options.StrokeJoin.MITER;
+
 	/**
 	 * Option für Pfeile mit Strichen als Kopf.
 	 */
@@ -1268,7 +1284,7 @@ public class Constants {
 	 *
 	 * @return Die {@code Random}-Instanz.
 	 */
-	private static Random getRandom() {
+	public static Random getRandom() {
 		if( random == null ) {
 			random = new Random();
 		}
@@ -1389,26 +1405,6 @@ public class Constants {
 		return getRandom().nextGaussian();
 	}
 
-	/**
-	 * Wählt ein zufälliges Element aus dem Array aus.
-	 *
-	 * @param values Ein Array mit Werten, die zur Auswahl stehen.
-	 * @return Ein zufälliges Element aus dem Array.
-	 */
-	public static final int choice( int... values ) {
-		return values[random(0, values.length - 1)];
-	}
-
-	/**
-	 * Wählt ein zufälliges Element aus dem Array aus.
-	 *
-	 * @param values Ein Array mit Werten, die zur Auswahl stehen.
-	 * @return Ein zufälliges Element aus dem Array.
-	 */
-	public static final double choice( double... values ) {
-		return values[random(0, values.length - 1)];
-	}
-
 	/**
 	 * Wählt ein zufälliges Element aus dem Array aus.
 	 *
@@ -1571,6 +1567,18 @@ public class Constants {
 		return valueList.toArray(values);
 	}
 
+	/**
+	 * Bringt die Werte im Array in eine zufällige Reihenfolge.
+	 *
+	 * @param values Ein Array mit Werte, die gemischt werden sollen.
+	 * @param <T> Datentyp der Elemente.
+	 * @return Das Array in zufälliger Reihenfolge.
+	 */
+	public static final <T> List<T> shuffle( List<T> values ) {
+		Collections.shuffle(values, random);
+		return values;
+	}
+
 	/**
 	 * Geteilte {@code Noise}-Instanz zur Erzeugung von Perlin-Noise.
 	 */

src/main/java/schule/ngb/zm/Options.java

@@ -1,5 +1,6 @@
 package schule.ngb.zm;
 
+import java.awt.BasicStroke;
 import java.awt.geom.Arc2D;
 
 /**
@@ -31,6 +32,36 @@ public final class Options {
 		DOTTED
 	}
 
+	/**
+	 * Linienstile für Konturlinien.
+	 */
+	public enum StrokeJoin {
+
+		/**
+		 * Abgerundete Verbindungen.
+		 */
+		ROUND(BasicStroke.JOIN_ROUND),
+
+		/**
+		 * Abgeschnittene Verbindungen.
+		 */
+		BEVEL(BasicStroke.JOIN_BEVEL),
+
+		/**
+		 * Eckige Verbindungen.
+		 */
+		MITER(BasicStroke.JOIN_MITER);
+
+		/**
+		 * Der entsprechende Wert der Konstanten in {@link java.awt}
+		 */
+		public final int awt_type;
+
+		StrokeJoin( int type ) {
+			awt_type = type;
+		}
+	}
+
 	/**
 	 * Stile für Pfeilspitzen.
 	 */

src/main/java/schule/ngb/zm/Strokeable.java

@@ -174,7 +174,7 @@ public interface Strokeable extends Drawable {
 	 * @param weight Die Dicke der Konturlinie.
 	 */
 	default void setStrokeWeight( double weight ) {
-		setStroke(createStroke(getStrokeType(), weight));
+		setStroke(createStroke(getStrokeType(), weight, getStrokeJoin()));
 	}
 
 	/**
@@ -193,7 +193,26 @@ public interface Strokeable extends Drawable {
 	 * @see Options.StrokeType
 	 */
 	default void setStrokeType( Options.StrokeType type ) {
-		setStroke(createStroke(type, getStrokeWeight()));
+		setStroke(createStroke(type, getStrokeWeight(), getStrokeJoin()));
+	}
+
+	/**
+	 * Gibt die Art der Konturverbindungen zurück.
+	 *
+	 * @return Die aktuelle Art der Konturverbindungen.
+	 * @see Options.StrokeJoin
+	 */
+	Options.StrokeJoin getStrokeJoin();
+
+	/**
+	 * Setzt den Typ der Konturverbindungen. Erlaubte Werte sind {@link Constants#ROUND},
+	 * {@link Constants#MITER} und {@link Constants#BEVEL}.
+	 *
+	 * @param join Eine der möglichen Konturverbindungen.
+	 * @see Options.StrokeJoin
+	 */
+	default void setStrokeJoin( Options.StrokeJoin join ) {
+		setStroke(createStroke(getStrokeType(), getStrokeWeight(), join));
 	}
 
 	/**
@@ -205,26 +224,26 @@ public interface Strokeable extends Drawable {
 	 * @param strokeWeight
 	 * @return Ein {@code Stroke} mit den passenden Kontureigenschaften.
 	 */
-	static Stroke createStroke( Options.StrokeType strokeType, double strokeWeight ) {
+	static Stroke createStroke( Options.StrokeType strokeType, double strokeWeight, Options.StrokeJoin strokeJoin ) {
 		switch( strokeType ) {
 			case DOTTED:
 				return new BasicStroke(
 					(float) strokeWeight,
 					BasicStroke.CAP_ROUND,
-					BasicStroke.JOIN_ROUND,
+					strokeJoin.awt_type,
 					10.0f, new float[]{1.0f, 5.0f}, 0.0f);
 			case DASHED:
 				return new BasicStroke(
 					(float) strokeWeight,
 					BasicStroke.CAP_ROUND,
-					BasicStroke.JOIN_ROUND,
+					strokeJoin.awt_type,
 					10.0f, new float[]{5.0f}, 0.0f);
 			case SOLID:
 			default:
 				return new BasicStroke(
 					(float) strokeWeight,
 					BasicStroke.CAP_ROUND,
-					BasicStroke.JOIN_ROUND);
+					strokeJoin.awt_type);
 		}
 	}
 

src/main/java/schule/ngb/zm/Vector.java

@@ -191,6 +191,22 @@ public class Vector extends Point2D.Double {
 		return new Vector(x, y);
 	}
 
+	public int getIntX() {
+		return (int)this.x;
+	}
+
+	public int getRoundedX() {
+		return (int)Math.round(this.x);
+	}
+
+	public int getIntY() {
+		return (int)this.y;
+	}
+
+	public int getRoundedY() {
+		return (int)Math.round(this.y);
+	}
+
 	/**
 	 * Setzt die Komponenten dieses Vektors neu.
 	 *

src/main/java/schule/ngb/zm/Zeichenfenster.java

@@ -28,7 +28,7 @@ public class Zeichenfenster extends JFrame {
 	/**
 	 * Setzt das Look and Feel auf den Standard des Systems.
 	 * <p>
-	 * Sollte einmalig vor erstellen des erstyen Programmfensters aufgerufen
+	 * Sollte einmalig vor Erstellen des ersten Programmfensters aufgerufen
 	 * werden.
 	 */
 	public static final void setLookAndFeel() {

src/main/java/schule/ngb/zm/Zeichenmaschine.java

@@ -94,7 +94,7 @@ public class Zeichenmaschine extends Constants {
 	 */
 	private boolean running;
 
-	private boolean terminateImediately = false;
+	private boolean terminateImmediately = false;
 
 	/**
 	 * Ob die ZM nach dem nächsten Frame pausiert werden soll.
@@ -545,7 +545,7 @@ public class Zeichenmaschine extends Constants {
 
 		if( running ) {
 			running = false;
-			terminateImediately = true;
+			terminateImmediately = true;
 			quitAfterShutdown = true;
 			mainThread.interrupt();
 		} else {
@@ -769,6 +769,23 @@ public class Zeichenmaschine extends Constants {
 		framesPerSecond = framesPerSecondInternal;
 	}
 
+	/**
+	 * Erstellt aus dem aktuellen Inhalt der {@link Zeichenleinwand} ein neues
+	 * {@link BufferedImage}.
+	 */
+	public final BufferedImage getImage() {
+		BufferedImage img = ImageLoader.createImage(canvas.getWidth(), canvas.getHeight());
+
+		Graphics2D g = img.createGraphics();
+		// TODO: Transparente Hintergründe beim Speichern von png erlauben
+		g.setColor(DEFAULT_BACKGROUND.getJavaColor());
+		g.fillRect(0, 0, img.getWidth(), img.getHeight());
+		canvas.draw(g);
+		g.dispose();
+
+		return img;
+	}
+
 	/**
 	 * Speichert den aktuellen Inhalt der {@link Zeichenleinwand} in einer
 	 * Bilddatei auf der Festplatte. Zur Auswahl der Zieldatei wird dem Nutzer
@@ -794,24 +811,15 @@ public class Zeichenmaschine extends Constants {
 	 * Bilddatei im angegebenen Dateipfad auf der Festplatte.
 	 */
 	public final void saveImage( String filepath ) {
-		BufferedImage img = ImageLoader.createImage(canvas.getWidth(), canvas.getHeight());
-
-		Graphics2D g = img.createGraphics();
-		// TODO: Transparente Hintergründe beim Speichern von png erlauben
-		g.setColor(DEFAULT_BACKGROUND.getJavaColor());
-		g.fillRect(0, 0, img.getWidth(), img.getHeight());
-		canvas.draw(g);
-		g.dispose();
-
 		try {
-			ImageLoader.saveImage(img, new File(filepath), true);
+			ImageLoader.saveImage(getImage(), new File(filepath), true);
 		} catch( IOException ex ) {
 			ex.printStackTrace();
 		}
 	}
 
 	/**
-	 * Erstellt eine Momentanaufnahme des aktuellen Inhalts der
+	 * Erstellt eine Momentaufnahme des aktuellen Inhalts der
 	 * {@link Zeichenleinwand} und erstellt daraus eine
 	 * {@link ImageLayer Bildebene}. Die Ebene wird automatisch der
 	 * {@link Zeichenleinwand} vor dem {@link #background} hinzugefügt.
@@ -1399,7 +1407,7 @@ public class Zeichenmaschine extends Constants {
 
 						if( Thread.interrupted() ) {
 							running = false;
-							terminateImediately = true;
+							terminateImmediately = true;
 							break;
 						}
 					}
@@ -1455,7 +1463,7 @@ public class Zeichenmaschine extends Constants {
 			}
 			state = Options.AppState.STOPPED;
 			// Shutdown the updateThread
-			while( !terminateImediately && updateThreadExecutor.isRunning() ) {
+			while( !terminateImmediately && updateThreadExecutor.isRunning() ) {
 				Thread.yield();
 			}
 			updateThreadExecutor.shutdownNow();

src/main/java/schule/ngb/zm/anim/Animation.java

@@ -50,7 +50,7 @@ public abstract class Animation<T> extends Constants implements Updatable {
 	}
 
 	public void setEasing( DoubleUnaryOperator pEasing ) {
-		this.easing = pEasing;
+		this.easing = Validator.requireNotNull(pEasing, "easing");
 	}
 
 	public abstract T getAnimationTarget();
@@ -61,7 +61,7 @@ public abstract class Animation<T> extends Constants implements Updatable {
 		running = true;
 		finished = false;
 		animate(easing.applyAsDouble(0.0));
-		initializeEventDispatcher().dispatchEvent("start", this);
+		dispatchEvent("start");
 	}
 
 	public final void stop() {
@@ -70,7 +70,7 @@ public abstract class Animation<T> extends Constants implements Updatable {
 		animate(easing.applyAsDouble((double) elapsedTime / (double) runtime));
 		this.finish();
 		finished = true;
-		initializeEventDispatcher().dispatchEvent("stop", this);
+		dispatchEvent("stop");
 	}
 
 	public void initialize() {
@@ -100,10 +100,9 @@ public abstract class Animation<T> extends Constants implements Updatable {
 
 		double t = (double) elapsedTime / (double) runtime;
 		if( t >= 1.0 ) {
-			running = false;
 			stop();
 		} else {
-			animate(easing.applyAsDouble(t));
+			animate(getEasing().applyAsDouble(t));
 		}
 	}
 
@@ -118,7 +117,7 @@ public abstract class Animation<T> extends Constants implements Updatable {
 	 * e = Constants.limit(e, 0, 1);
 	 * </code></pre>
 	 *
-	 * @param e Fortschritt der Animation nachdem die Easingfunktion angewandt
+	 * @param e Fortschritt der Animation, nachdem die Easing-Funktion angewandt
 	 * 	wurde.
 	 */
 	public abstract void animate( double e );
@@ -134,6 +133,12 @@ public abstract class Animation<T> extends Constants implements Updatable {
 		return eventDispatcher;
 	}
 
+	private void dispatchEvent( String type ) {
+		if( eventDispatcher != null ) {
+			eventDispatcher.dispatchEvent(type, this);
+		}
+	}
+
 	public void addListener( AnimationListener listener ) {
 		initializeEventDispatcher().addListener(listener);
 	}

src/main/java/schule/ngb/zm/anim/AnimationFacade.java

@@ -4,9 +4,15 @@ import schule.ngb.zm.util.Validator;
 
 import java.util.function.DoubleUnaryOperator;
 
+/**
+ * Eine Wrapper Animation, um die Werte einer anderen Animation (Laufzeit, Easing) zu überschrieben,
+ * ohne die Werte der Originalanimation zu verändern.
+ *
+ * @param <S> Art des Animierten Objektes.
+ */
 public class AnimationFacade<S> extends Animation<S> {
 
-	private Animation<S> anim;
+	private final Animation<S> anim;
 
 	public AnimationFacade( Animation<S> anim, int runtime, DoubleUnaryOperator easing ) {
 		super(runtime, easing);

src/main/java/schule/ngb/zm/anim/AnimationGroup.java

@@ -1,22 +1,28 @@
 package schule.ngb.zm.anim;
 
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 import java.util.function.DoubleUnaryOperator;
 
+// TODO: (ngb) Maybe use AnimationFacade to override runtime?
 @SuppressWarnings( "unused" )
 public class AnimationGroup<T> extends Animation<T> {
 
-	List<Animation<T>> anims;
+	private final List<Animation<T>> anims;
 
-	private boolean overrideEasing = false;
+	private final boolean overrideEasing;
 
 	private int overrideRuntime = -1;
 
-	private int lag = 0;
+	private final int lag;
 
 	private int active = 0;
 
+	public AnimationGroup( Animation<T>... anims ) {
+		this(0, -1, null, Arrays.asList(anims));
+	}
+
 	public AnimationGroup( Collection<Animation<T>> anims ) {
 		this(0, -1, null, anims);
 	}
@@ -42,6 +48,8 @@ public class AnimationGroup<T> extends Animation<T> {
 		if( easing != null ) {
 			this.easing = easing;
 			overrideEasing = true;
+		} else {
+			overrideEasing = false;
 		}
 
 		if( runtime > 0 ) {
@@ -64,52 +72,110 @@ public class AnimationGroup<T> extends Animation<T> {
 				return anim.getAnimationTarget();
 			}
 		}
-		return anims.get(anims.size() - 1).getAnimationTarget();
+		if( this.finished ) {
+			return anims.get(anims.size() - 1).getAnimationTarget();
+		} else {
+			return anims.get(0).getAnimationTarget();
+		}
 	}
 
 	@Override
-	public void update( double delta ) {
-		elapsedTime += (int) (delta * 1000);
-		// Animation is done. Stop all Animations.
-		if( elapsedTime > runtime ) {
-			for( int i = 0; i < anims.size(); i++ ) {
-				if( anims.get(i).isActive() ) {
-					anims.get(i).elapsedTime = anims.get(i).runtime;
-					anims.get(i).stop();
-				}
+	public DoubleUnaryOperator getEasing() {
+		for( Animation<T> anim : anims ) {
+			if( anim.isActive() ) {
+				return anim.getEasing();
 			}
-			running = false;
-			this.stop();
 		}
-
-		while( active < anims.size() && elapsedTime >= active * lag ) {
-			anims.get(active).start();
-			active += 1;
+		if( this.finished ) {
+			return anims.get(anims.size() - 1).getEasing();
+		} else {
+			return anims.get(0).getEasing();
 		}
+	}
 
-		for( int i = 0; i < active; i++ ) {
-			double t = 0.0;
-			if( overrideRuntime > 0 ) {
-				t = (double) (elapsedTime - i*lag) / (double) overrideRuntime;
-			} else {
-				t = (double) (elapsedTime - i*lag) / (double) anims.get(i).getRuntime();
-			}
+//	@Override
+//	public void update( double delta ) {
+//		elapsedTime += (int) (delta * 1000);
+//
+//		// Animation is done. Stop all Animations.
+//		if( elapsedTime > runtime ) {
+//			for( int i = 0; i < anims.size(); i++ ) {
+//				if( anims.get(i).isActive() ) {
+//					anims.get(i).elapsedTime = anims.get(i).runtime;
+//					anims.get(i).stop();
+//				}
+//			}
+//			elapsedTime = runtime;
+//			running = false;
+//			this.stop();
+//		}
+//
+//		while( active < anims.size() && elapsedTime >= active * lag ) {
+//			anims.get(active).start();
+//			active += 1;
+//		}
+//
+//		for( int i = 0; i < active; i++ ) {
+//			double t = 0.0;
+//			if( overrideRuntime > 0 ) {
+//				t = (double) (elapsedTime - i*lag) / (double) overrideRuntime;
+//			} else {
+//				t = (double) (elapsedTime - i*lag) / (double) anims.get(i).getRuntime();
+//			}
+//
+//			if( t >= 1.0 ) {
+//				anims.get(i).elapsedTime = anims.get(i).runtime;
+//				anims.get(i).stop();
+//			} else {
+//				double e = overrideEasing ?
+//					easing.applyAsDouble(t) :
+//					anims.get(i).easing.applyAsDouble(t);
+//
+//				anims.get(i).animate(e);
+//			}
+//		}
+//	}
 
-			if( t >= 1.0 ) {
-				anims.get(i).elapsedTime = anims.get(i).runtime;
-				anims.get(i).stop();
-			} else {
-				double e = overrideEasing ?
-					easing.applyAsDouble(t) :
-					anims.get(i).easing.applyAsDouble(t);
 
-				anims.get(i).animate(e);
+	@Override
+	public void finish() {
+		for( Animation<T> anim : anims ) {
+			if( anim.isActive() ) {
+				anim.elapsedTime = anim.runtime;
+				anim.stop();
 			}
 		}
 	}
 
 	@Override
 	public void animate( double e ) {
+		while( active < anims.size() && elapsedTime >= active * lag ) {
+			anims.get(active).start();
+			active += 1;
+		}
+
+		for( int i = 0; i < active; i++ ) {
+			Animation<T> curAnim = anims.get(i);
+
+			double curRuntime = curAnim.getRuntime();
+			if( overrideRuntime > 0 ) {
+				curRuntime = overrideRuntime;
+			}
+
+			double t = (double) (elapsedTime - i * lag) / (double) curRuntime;
+			if( t >= 1.0 ) {
+				curAnim.elapsedTime = curAnim.getRuntime();
+				curAnim.stop();
+			} else {
+				e = overrideEasing ?
+					easing.applyAsDouble(t) :
+					curAnim.easing.applyAsDouble(t);
+
+				curAnim.elapsedTime = (elapsedTime - i * lag);
+				curAnim.animate(e);
+			}
+		}
+
 	}
 
 }

src/main/java/schule/ngb/zm/anim/AnimationSequence.java

@@ -0,0 +1,144 @@
+package schule.ngb.zm.anim;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.List;
+import java.util.function.DoubleUnaryOperator;
+
+/**
+ * Führt eine Liste von Animationen nacheinander aus. Jede Animation startet direkt nachdem die
+ * davor geendet ist. Optional kann zwischen dem Ende einer und dem Start der nächsten Animation
+ * ein
+ * <var>lag</var> eingefügt werden.
+ *
+ * @param <T> Die Art des animierten Objektes.
+ */
+@SuppressWarnings( "unused" )
+public class AnimationSequence<T> extends Animation<T> {
+
+	private final List<Animation<T>> anims;
+
+	private final int lag;
+
+	private int currentAnimationIndex = -1, currentStart = -1, nextStart = -1;
+
+	@SafeVarargs
+	public AnimationSequence( Animation<T>... anims ) {
+		this(0, Arrays.asList(anims));
+	}
+
+	public AnimationSequence( Collection<Animation<T>> anims ) {
+		this(0, anims);
+	}
+
+	public AnimationSequence( int lag, Collection<Animation<T>> anims ) {
+		super(Easing::linear);
+
+		this.anims = List.copyOf(anims);
+		this.lag = lag;
+
+		this.runtime = (anims.size() - 1) * lag + anims.stream().mapToInt(Animation::getRuntime).sum();
+	}
+
+	@Override
+	public T getAnimationTarget() {
+		for( Animation<T> anim : anims ) {
+			if( anim.isActive() ) {
+				return anim.getAnimationTarget();
+			}
+		}
+		if( this.finished ) {
+			return anims.get(anims.size() - 1).getAnimationTarget();
+		} else {
+			return anims.get(0).getAnimationTarget();
+		}
+	}
+
+	@Override
+	public DoubleUnaryOperator getEasing() {
+		for( Animation<T> anim : anims ) {
+			if( anim.isActive() ) {
+				return anim.getEasing();
+			}
+		}
+		if( this.finished ) {
+			return anims.get(anims.size() - 1).getEasing();
+		} else {
+			return anims.get(0).getEasing();
+		}
+	}
+
+//	@Override
+//	public void update( double delta ) {
+//		elapsedTime += (int) (delta * 1000);
+//
+//		// Animation is done. Stop all Animations.
+//		if( elapsedTime > runtime ) {
+//			for( int i = 0; i < anims.size(); i++ ) {
+//				if( anims.get(i).isActive() ) {
+//					anims.get(i).elapsedTime = anims.get(i).runtime;
+//					anims.get(i).stop();
+//				}
+//			}
+//			elapsedTime = runtime;
+//			running = false;
+//			this.stop();
+//		}
+//
+//		Animation<T> curAnim = null;
+//		if( elapsedTime > nextStart ) {
+//			currentAnimation += 1;
+//			curAnim = anims.get(currentAnimation);
+//			currentStart = nextStart;
+//			nextStart += lag + curAnim.getRuntime();
+//			curAnim.start();
+//		} else {
+//			curAnim = anims.get(currentAnimation);
+//		}
+//
+//		// Calculate delta for current animation
+//		double t = (double) (elapsedTime - currentStart) / (double) curAnim.getRuntime();
+//		if( t >= 1.0 ) {
+//			curAnim.elapsedTime = curAnim.runtime;
+//			curAnim.stop();
+//		} else {
+//			curAnim.animate(curAnim.easing.applyAsDouble(t));
+//		}
+//	}
+
+
+	@Override
+	public void finish() {
+		for( Animation<T> anim : anims ) {
+			if( anim.isActive() ) {
+				anim.elapsedTime = anim.runtime;
+				anim.stop();
+			}
+		}
+	}
+
+	@Override
+	public void animate( double e ) {
+		Animation<T> curAnim = null;
+		if( running && elapsedTime > nextStart ) {
+			currentAnimationIndex += 1;
+			curAnim = anims.get(currentAnimationIndex);
+			currentStart = nextStart;
+			nextStart += lag + curAnim.getRuntime();
+			curAnim.start();
+		} else {
+			curAnim = anims.get(currentAnimationIndex);
+		}
+
+		// Calculate delta for current animation
+		double t = (double) (elapsedTime - currentStart) / (double) curAnim.getRuntime();
+		if( t >= 1.0 ) {
+			curAnim.elapsedTime = curAnim.runtime;
+			curAnim.stop();
+		} else {
+			curAnim.elapsedTime = (elapsedTime - currentStart);
+			curAnim.animate(curAnim.easing.applyAsDouble(t));
+		}
+	}
+
+}

src/main/java/schule/ngb/zm/anim/CircleAnimation.java

@@ -7,33 +7,87 @@ import schule.ngb.zm.shapes.Shape;
 
 import java.util.function.DoubleUnaryOperator;
 
+/**
+ * Animates the {@code target} in a circular motion centered at (<var>cx</var>, <var>cy</var>).
+ */
 public class CircleAnimation extends Animation<Shape> {
 
-	private Shape object;
+	private final Shape target;
 
-	private double centerx, centery, radius, startangle;
+	private final double centerX, centerY, rotateTo;
 
-	public CircleAnimation( Shape target, double cx, double cy, int runtime, DoubleUnaryOperator easing ) {
+	private double rotationRadius, startAngle;
+
+	private final boolean rotateRight;
+
+	public CircleAnimation( Shape target, double cx, double cy ) {
+		this(target, cx, cy, 360, true, DEFAULT_ANIM_RUNTIME, DEFAULT_EASING);
+	}
+
+	public CircleAnimation( Shape target, double cx, double cy, double rotateTo ) {
+		this(target, cx, cy, rotateTo, true, DEFAULT_ANIM_RUNTIME, DEFAULT_EASING);
+	}
+
+	public CircleAnimation( Shape target, double cx, double cy, boolean rotateRight ) {
+		this(target, cx, cy, 360, rotateRight, DEFAULT_ANIM_RUNTIME, DEFAULT_EASING);
+	}
+
+	public CircleAnimation( Shape target, double cx, double cy, double rotateTo, boolean rotateRight ) {
+		this(target, cx, cy, rotateTo, rotateRight, DEFAULT_ANIM_RUNTIME, DEFAULT_EASING);
+	}
+
+	public CircleAnimation( Shape target, double cx, double cy, int runtime ) {
+		this(target, cx, cy, 360, true, runtime, DEFAULT_EASING);
+	}
+
+	public CircleAnimation( Shape target, double cx, double cy, boolean rotateRight, int runtime ) {
+		this(target, cx, cy, 360, rotateRight, runtime, DEFAULT_EASING);
+	}
+
+	public CircleAnimation( Shape target, double cx, double cy, DoubleUnaryOperator easing ) {
+		this(target, cx, cy, 360, true, DEFAULT_ANIM_RUNTIME, easing);
+	}
+
+	public CircleAnimation( Shape target, double cx, double cy, boolean rotateRight, DoubleUnaryOperator easing ) {
+		this(target, cx, cy, 360, rotateRight, DEFAULT_ANIM_RUNTIME, easing);
+	}
+
+	public CircleAnimation( Shape target, double cx, double cy, double rotateTo, int runtime, DoubleUnaryOperator easing ) {
+		this(target, cx, cy, rotateTo, true, runtime, easing);
+	}
+
+	public CircleAnimation( Shape target, double cx, double cy, double rotateTo, boolean rotateRight, int runtime, DoubleUnaryOperator easing ) {
 		super(runtime, easing);
-		object = target;
-		centerx = cx;
-		centery = cy;
-		Vector vec = new Vector(target.getX(), target.getY()).sub(cx, cy);
-		startangle = vec.heading();
-		radius = vec.length();
+		this.target = target;
+		this.centerX = cx;
+		this.centerY = cy;
+		this.rotateTo = Constants.radians(Constants.limit(rotateTo, 0, 360));
+		this.rotateRight = rotateRight;
+	}
+
+	@Override
+	public void initialize() {
+		Vector vec = new Vector(target.getX(), target.getY()).sub(centerX, centerY);
+		startAngle = vec.heading();
+		rotationRadius = vec.length();
 	}
 
 	@Override
 	public Shape getAnimationTarget() {
-		return object;
+		return target;
 	}
 
 	@Override
 	public void animate( double e ) {
-		double angle = startangle + Constants.radians(Constants.interpolate(0, 360, e));
-		double x = centerx + radius * Constants.cos(angle);
-		double y = centery + radius * Constants.sin(angle);
-		object.moveTo(x, y);
+		double angle = startAngle;
+		if( rotateRight ) {
+			angle += Constants.interpolate(0, rotateTo, e);
+		} else {
+			angle -= Constants.interpolate(0, rotateTo, e);
+		}
+		double x = centerX + rotationRadius * Constants.cos(angle);
+		double y = centerY + rotationRadius * Constants.sin(angle);
+		target.moveTo(x, y);
 	}
 
 }

src/main/java/schule/ngb/zm/anim/ContinousAnimation.java

@@ -8,9 +8,9 @@ public class ContinousAnimation<T> extends Animation<T> {
 	private int lag = 0;
 
 	/**
-	 * Speichert eine Approximation der aktuellen Steigung der Easing-Funktion,
-	 * um im Fall {@code easeInOnly == true} nach dem ersten Durchlauf die
-	 * passende Geschwindigkeit beizubehalten.
+	 * Speichert eine Approximation der aktuellen Steigung der Easing-Funktion, um im Fall
+	 * {@code easeInOnly == true} nach dem ersten Durchlauf die passende Geschwindigkeit
+	 * beizubehalten.
 	 */
 	private double m = 1.0, lastEase = 0.0;
 
@@ -29,7 +29,7 @@ public class ContinousAnimation<T> extends Animation<T> {
 	}
 
 	private ContinousAnimation( Animation<T> baseAnimation, int lag, boolean easeInOnly ) {
-		super(baseAnimation.getRuntime(), baseAnimation.getEasing());
+		super(baseAnimation.getRuntime() + lag, baseAnimation.getEasing());
 		this.baseAnimation = baseAnimation;
 		this.lag = lag;
 		this.easeInOnly = easeInOnly;
@@ -40,35 +40,80 @@ public class ContinousAnimation<T> extends Animation<T> {
 		return baseAnimation.getAnimationTarget();
 	}
 
+	@Override
+	public int getRuntime() {
+		return Integer.MAX_VALUE;
+	}
+
+	//	@Override
+//	public void update( double delta ) {
+//		elapsedTime += (int) (delta * 1000);
+//		if( elapsedTime >= runtime + lag ) {
+//			elapsedTime %= (runtime + lag);
+//
+//			if( easeInOnly && easing != null ) {
+//				easing = null;
+//				// runtime = (int)((1.0/m)*(runtime + lag));
+//			}
+//		}
+//
+//		double t = (double) elapsedTime / (double) runtime;
+//		if( t >= 1.0 ) {
+//			t = 1.0;
+//		}
+//		if( easing != null ) {
+//			double e = easing.applyAsDouble(t);
+//			animate(e);
+//			m = (e-lastEase)/(delta*1000/(asDouble(runtime)));
+//			lastEase = e;
+//		} else {
+//			animate(t);
+//		}
+//	}
+
+
+	@Override
+	public void finish() {
+		baseAnimation.elapsedTime = baseAnimation.getRuntime();
+		baseAnimation.stop();
+	}
+
+	@Override
+	public void initialize() {
+		baseAnimation.start();
+	}
+
+	@Override
+	public void setRuntime( int pRuntime ) {
+		baseAnimation.setRuntime(pRuntime);
+		runtime = pRuntime + lag;
+	}
+
 	@Override
 	public void update( double delta ) {
-		elapsedTime += (int) (delta * 1000);
-		if( elapsedTime >= runtime + lag ) {
-			elapsedTime %= (runtime + lag);
+		int currentRuntime = elapsedTime + (int) (delta * 1000);
+		if( currentRuntime >= runtime + lag ) {
+			elapsedTime = currentRuntime % (runtime + lag);
 
 			if( easeInOnly && easing != null ) {
-				easing = null;
+				easing = Easing.linear();
 				// runtime = (int)((1.0/m)*(runtime + lag));
 			}
 		}
 
-		double t = (double) elapsedTime / (double) runtime;
-		if( t >= 1.0 ) {
-			t = 1.0;
-		}
-		if( easing != null ) {
-			double e = easing.applyAsDouble(t);
-			animate(e);
-			m = (e-lastEase)/(delta*1000/(asDouble(runtime)));
-			lastEase = e;
-		} else {
-			animate(t);
-		}
+		super.update(delta);
 	}
 
 	@Override
 	public void animate( double e ) {
+//		double t = (double) elapsedTime / (double) runtime;
+//		if( t >= 1.0 ) {
+//			t = 1.0;
+//		}
+		baseAnimation.elapsedTime = elapsedTime;
 		baseAnimation.animate(e);
+		m = (e - lastEase) / (delta * 1000 / (asDouble(runtime)));
+		lastEase = e;
 	}
 
 }

src/main/java/schule/ngb/zm/anim/FadeAnimation.java

@@ -13,32 +13,51 @@ public class FadeAnimation extends Animation<Shape> {
 
 	public static final int FADE_OUT = 0;
 
-	private Shape object;
+	private final Shape target;
+
+	private final int targetAlpha;
 
 	private Color fill, stroke;
 
-	private int fillAlpha, strokeAlpha, tAlpha;
+	private int fillAlpha, strokeAlpha;
 
-	public FadeAnimation( Shape object, int alpha, int runtime, DoubleUnaryOperator easing ) {
+	public FadeAnimation( Shape target, int targetAlpha ) {
+		this(target, targetAlpha, DEFAULT_ANIM_RUNTIME, DEFAULT_EASING);
+	}
+
+	public FadeAnimation( Shape target, int targetAlpha, int runtime ) {
+		this(target, targetAlpha, runtime, DEFAULT_EASING);
+	}
+
+	public FadeAnimation( Shape target, int runtime, DoubleUnaryOperator easing ) {
+		this(target, 0, runtime, easing);
+	}
+
+	public FadeAnimation( Shape target, int targetAlpha, int runtime, DoubleUnaryOperator easing ) {
 		super(runtime, easing);
 
-		this.object = object;
-		fill = object.getFillColor();
+		this.target = target;
+		this.targetAlpha = targetAlpha;
+	}
+
+	@Override
+	public void initialize() {
+		fill = target.getFillColor();
 		fillAlpha = fill.getAlpha();
-		stroke = object.getStrokeColor();
+		stroke = target.getStrokeColor();
 		strokeAlpha = stroke.getAlpha();
-		tAlpha = alpha;
+
 	}
 
 	@Override
 	public Shape getAnimationTarget() {
-		return object;
+		return target;
 	}
 
 	@Override
 	public void animate( double e ) {
-		object.setFillColor(new Color(fill, (int) Constants.interpolate(fillAlpha, tAlpha, e)));
-		object.setStrokeColor(new Color(stroke, (int) Constants.interpolate(strokeAlpha, tAlpha, e)));
+		target.setFillColor(fill, (int) Constants.interpolate(fillAlpha, targetAlpha, e));
+		target.setStrokeColor(stroke, (int) Constants.interpolate(strokeAlpha, targetAlpha, e));
 	}
 
 }

src/main/java/schule/ngb/zm/anim/FillAnimation.java

@@ -1,23 +1,28 @@
 package schule.ngb.zm.anim;
 
 import schule.ngb.zm.Color;
-import schule.ngb.zm.Constants;
 import schule.ngb.zm.shapes.Shape;
 
 import java.util.function.DoubleUnaryOperator;
 
 public class FillAnimation extends Animation<Shape> {
 
-	private Shape object;
+	private final Shape object;
 
-	private Color oFill, tFill;
+	private Color originFill;
 
-	public FillAnimation( Shape object, Color newFill, int runtime, DoubleUnaryOperator easing ) {
+	private final Color targetFill;
+
+	public FillAnimation( Shape target, Color newFill, int runtime, DoubleUnaryOperator easing ) {
 		super(runtime, easing);
 
-		this.object = object;
-		oFill = object.getFillColor();
-		tFill = newFill;
+		this.object = target;
+		targetFill = newFill;
+	}
+
+	@Override
+	public void initialize() {
+		originFill = object.getFillColor();
 	}
 
 	@Override
@@ -27,7 +32,7 @@ public class FillAnimation extends Animation<Shape> {
 
 	@Override
 	public void animate( double e ) {
-		object.setFillColor(Color.interpolate(oFill, tFill, e));
+		object.setFillColor(Color.interpolate(originFill, targetFill, e));
 	}
 
 }

src/main/java/schule/ngb/zm/anim/MoveAnimation.java

@@ -1,28 +1,31 @@
 package schule.ngb.zm.anim;
 
-import schule.ngb.zm.Color;
 import schule.ngb.zm.Constants;
-import schule.ngb.zm.shapes.Circle;
-import schule.ngb.zm.shapes.Ellipse;
-import schule.ngb.zm.shapes.Rectangle;
 import schule.ngb.zm.shapes.Shape;
 
 import java.util.function.DoubleUnaryOperator;
 
 public class MoveAnimation extends Animation<Shape> {
 
-	private Shape object;
+	private final Shape object;
 
-	private double oX, oY, tX, tY;
+	private final double targetX, targetY;
 
-	public MoveAnimation( Shape object, double x, double y, int runtime, DoubleUnaryOperator easing ) {
+	private double originX, originY;
+
+
+	public MoveAnimation( Shape target, double targetX, double targetY, int runtime, DoubleUnaryOperator easing ) {
 		super(runtime, easing);
 
-		this.object = object;
-		oX = object.getX();
-		oY = object.getY();
-		tX = x;
-		tY = y;
+		this.object = target;
+		this.targetX = targetX;
+		this.targetY = targetY;
+	}
+
+	@Override
+	public void initialize() {
+		originX = object.getX();
+		originY = object.getY();
 	}
 
 	@Override
@@ -32,8 +35,8 @@ public class MoveAnimation extends Animation<Shape> {
 
 	@Override
 	public void animate( double e ) {
-		object.setX(Constants.interpolate(oX, tX, e));
-		object.setY(Constants.interpolate(oY, tY, e));
+		object.setX(Constants.interpolate(originX, targetX, e));
+		object.setY(Constants.interpolate(originY, targetY, e));
 	}
 
 }

src/main/java/schule/ngb/zm/layers/DrawingLayer.java

@@ -404,6 +404,11 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 		return shapeDelegate.getStrokeType();
 	}
 
+	@Override
+	public Options.StrokeJoin getStrokeJoin() {
+		return shapeDelegate.getStrokeJoin();
+	}
+
 	/**
 	 * Setzt den Typ der Kontur. Erlaubte Werte sind {@link #DASHED},
 	 * {@link #DOTTED} und {@link #SOLID}.
@@ -980,7 +985,7 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * @see ImageLoader#loadImage(String)
 	 */
 	public void image( String imageSource, double x, double y ) {
-		image(ImageLoader.loadImage(imageSource), x, y, 1.0, shapeDelegate.getAnchor());
+		imageScale(ImageLoader.loadImage(imageSource), x, y, 1.0, shapeDelegate.getAnchor());
 	}
 
 	/**
@@ -997,7 +1002,7 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * @see ImageLoader#loadImage(String)
 	 */
 	public void image( String imageSource, double x, double y, Options.Direction anchor ) {
-		image(ImageLoader.loadImage(imageSource), x, y, 1.0, anchor);
+		imageScale(ImageLoader.loadImage(imageSource), x, y, 1.0, anchor);
 	}
 
 	/**
@@ -1005,8 +1010,9 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * Koordinaten auf die Zeichenebene. Das Bild wird um den angegebenen Faktor
 	 * skaliert.
 	 * <p>
-	 * Siehe {@link #image(Image, double, double, double, Options.Direction)}
-	 * für mehr Details.
+	 * Siehe
+	 * {@link #imageScale(Image, double, double, double, Options.Direction)} für
+	 * mehr Details.
 	 *
 	 * @param imageSource Die Bildquelle.
 	 * @param x x-Koordinate des Ankerpunktes.
@@ -1014,8 +1020,8 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * @param scale Der Skalierungsfaktor des Bildes.
 	 * @see ImageLoader#loadImage(String)
 	 */
-	public void image( String imageSource, double x, double y, double scale ) {
-		image(ImageLoader.loadImage(imageSource), x, y, scale, shapeDelegate.getAnchor());
+	public void imageScale( String imageSource, double x, double y, double scale ) {
+		imageScale(ImageLoader.loadImage(imageSource), x, y, scale, shapeDelegate.getAnchor());
 	}
 
 	/**
@@ -1023,8 +1029,9 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * Koordinaten auf die Zeichenebene. Das Bild wird um den angegebenen Faktor
 	 * skaliert und der angegebene Ankerpunkt verwendet.
 	 * <p>
-	 * Siehe {@link #image(Image, double, double, double, Options.Direction)}
-	 * für mehr Details.
+	 * Siehe
+	 * {@link #imageScale(Image, double, double, double, Options.Direction)} für
+	 * mehr Details.
 	 *
 	 * @param imageSource Die Bildquelle.
 	 * @param x x-Koordinate des Ankerpunktes.
@@ -1033,8 +1040,8 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * @param anchor Der Ankerpunkt.
 	 * @see ImageLoader#loadImage(String)
 	 */
-	public void image( String imageSource, double x, double y, double scale, Options.Direction anchor ) {
-		image(ImageLoader.loadImage(imageSource), x, y, scale, anchor);
+	public void imageScale( String imageSource, double x, double y, double scale, Options.Direction anchor ) {
+		imageScale(ImageLoader.loadImage(imageSource), x, y, scale, anchor);
 	}
 
 	/**
@@ -1046,23 +1053,24 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * @param y y-Koordinate des Ankerpunktes.
 	 */
 	public void image( Image image, double x, double y ) {
-		image(image, x, y, 1.0, shapeDelegate.getAnchor());
+		imageScale(image, x, y, 1.0, shapeDelegate.getAnchor());
 	}
 
 	/**
 	 * Zeichnet das angegebene Bild an den angegebenen Koordinaten auf die
 	 * Zeichenebene. Das Bild wird um den angegebenen Faktor skaliert.
 	 * <p>
-	 * Siehe {@link #image(Image, double, double, double, Options.Direction)}
-	 * für mehr Details.
+	 * Siehe
+	 * {@link #imageScale(Image, double, double, double, Options.Direction)} für
+	 * mehr Details.
 	 *
 	 * @param image Das vorher geladene Bild.
 	 * @param x x-Koordinate des Ankerpunktes.
 	 * @param y y-Koordinate des Ankerpunktes.
 	 * @param scale Der Skalierungsfaktor des Bildes.
 	 */
-	public void image( Image image, double x, double y, double scale ) {
-		image(image, x, y, scale, shapeDelegate.getAnchor());
+	public void imageScale( Image image, double x, double y, double scale ) {
+		imageScale(image, x, y, scale, shapeDelegate.getAnchor());
 	}
 
 	/**
@@ -1077,8 +1085,8 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * Das Seitenverhältnis wird immer beibehalten.
 	 * <p>
 	 * Soll das Bild innerhalb eines vorgegebenen Rechtecks liegen, sollte
-	 * {@link #image(Image, double, double, double, double, Options.Direction)}
-	 * verwendet werden.
+	 * {@link #imageScale(Image, double, double, double, double,
+	 * Options.Direction)} verwendet werden.
 	 *
 	 * @param image Das vorher geladene Bild.
 	 * @param x x-Koordinate des Ankerpunktes.
@@ -1086,7 +1094,7 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * @param scale Der Skalierungsfaktor des Bildes.
 	 * @param anchor Der Ankerpunkt.
 	 */
-	public void image( Image image, double x, double y, double scale, Options.Direction anchor ) {
+	public void imageScale( Image image, double x, double y, double scale, Options.Direction anchor ) {
 		/*if( image != null ) {
 			double neww = image.getWidth(null) * scale;
 			double newh = image.getHeight(null) * scale;
@@ -1095,7 +1103,7 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 		}*/
 		double neww = image.getWidth(null) * scale;
 		double newh = image.getHeight(null) * scale;
-		image(image, x, y, neww, newh, anchor);
+		imageScale(image, x, y, neww, newh, anchor);
 	}
 
 	/**
@@ -1103,8 +1111,8 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * Koordinaten in der angegebenen Größe auf die Zeichenebene.
 	 * <p>
 	 * Siehe
-	 * {@link #image(Image, double, double, double, double, Options.Direction)}
-	 * für mehr Details.
+	 * {@link #imageScale(Image, double, double, double, double,
+	 * Options.Direction)} für mehr Details.
 	 *
 	 * @param imageSource Die Bildquelle.
 	 * @param x x-Koordinate des Ankerpunktes.
@@ -1113,8 +1121,8 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * @param height Höhe des Bildes auf der Zeichenebene oder 0.
 	 * @see ImageLoader#loadImage(String)
 	 */
-	public void image( String imageSource, double x, double y, double width, double height ) {
-		image(ImageLoader.loadImage(imageSource), x, y, width, height, shapeDelegate.getAnchor());
+	public void imageScale( String imageSource, double x, double y, double width, double height ) {
+		imageScale(ImageLoader.loadImage(imageSource), x, y, width, height, shapeDelegate.getAnchor());
 	}
 
 	/**
@@ -1123,8 +1131,8 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * angegebene Ankerpunkt verwendet.
 	 * <p>
 	 * Siehe
-	 * {@link #image(Image, double, double, double, double, Options.Direction)}
-	 * für mehr Details.
+	 * {@link #imageScale(Image, double, double, double, double,
+	 * Options.Direction)} für mehr Details.
 	 *
 	 * @param imageSource Die Bildquelle.
 	 * @param x x-Koordinate des Ankerpunktes.
@@ -1134,8 +1142,8 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * @param anchor Der Ankerpunkt.
 	 * @see ImageLoader#loadImage(String)
 	 */
-	public void image( String imageSource, double x, double y, double width, double height, Options.Direction anchor ) {
-		image(ImageLoader.loadImage(imageSource), x, y, width, height, anchor);
+	public void imageScale( String imageSource, double x, double y, double width, double height, Options.Direction anchor ) {
+		imageScale(ImageLoader.loadImage(imageSource), x, y, width, height, anchor);
 	}
 
 	/**
@@ -1143,8 +1151,8 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * angegebenen Größe auf die Zeichenebene.
 	 * <p>
 	 * Siehe
-	 * {@link #image(Image, double, double, double, double, Options.Direction)}
-	 * für mehr Details.
+	 * {@link #imageScale(Image, double, double, double, double,
+	 * Options.Direction)} für mehr Details.
 	 *
 	 * @param image Ein Bild-Objekt.
 	 * @param x x-Koordinate des Ankerpunktes.
@@ -1152,8 +1160,8 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * @param width Breite des Bildes auf der Zeichenebene oder 0.
 	 * @param height Höhe des Bildes auf der Zeichenebene oder 0.
 	 */
-	public void image( Image image, double x, double y, double width, double height ) {
-		image(image, x, y, width, height, shapeDelegate.getAnchor());
+	public void imageScale( Image image, double x, double y, double width, double height ) {
+		imageScale(image, x, y, width, height, shapeDelegate.getAnchor());
 	}
 
 	/**
@@ -1171,7 +1179,7 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * <p>
 	 * Soll die Bildgröße unter Beachtung der Abmessungen um einen Faktor
 	 * verändert werden, sollte
-	 * {@link #image(Image, double, double, double, Options.Direction)}
+	 * {@link #imageScale(Image, double, double, double, Options.Direction)}
 	 * verwendet werden.
 	 *
 	 * @param image Ein Bild-Objekt.
@@ -1181,17 +1189,163 @@ public class DrawingLayer extends Layer implements Strokeable, Fillable {
 	 * @param height Höhe des Bildes auf der Zeichenebene oder 0.
 	 * @param anchor Der Ankerpunkt.
 	 */
-	public void image( Image image, double x, double y, double width, double height, Options.Direction anchor ) {
+	public void imageScale( Image image, double x, double y, double width, double height, Options.Direction anchor ) {
+		imageRotateAndScale(image, x, y, 0, width, height, anchor);
+	}
+
+	/**
+	 * Zeichnet das Bild von der angegebenen Bildquelle an den angegebenen
+	 * Koordinaten mit der angegebenen Drehung auf die Zeichenebene.
+	 * <p>
+	 * Das Bild wird um seinen Mittelpunkt als Rotationszentrum gedreht.
+	 *
+	 * @param imageSource Die Bildquelle.
+	 * @param x x-Koordinate des Ankerpunktes.
+	 * @param y y-Koordinate des Ankerpunktes.
+	 * @param angle Winkel in Grad.
+	 */
+	public void imageRotate( String imageSource, double x, double y, double angle ) {
+		imageRotate(ImageLoader.loadImage(imageSource), x, y, angle, shapeDelegate.getAnchor());
+	}
+
+	/**
+	 * Zeichnet das Bild von der angegebenen Bildquelle an den angegebenen
+	 * Koordinaten mit der angegebenen Drehung auf die Zeichenebene. Der
+	 * angegebene Ankerpunkt wird verwendet.
+	 * <p>
+	 * Das Bild wird um seinen Mittelpunkt als Rotationszentrum gedreht.
+	 *
+	 * @param imageSource Die Bildquelle.
+	 * @param x x-Koordinate des Ankerpunktes.
+	 * @param y y-Koordinate des Ankerpunktes.
+	 * @param angle Winkel in Grad.
+	 * @param anchor Der Ankerpunkt.
+	 */
+	public void imageRotate( String imageSource, double x, double y, double angle, Options.Direction anchor ) {
+		imageRotate(ImageLoader.loadImage(imageSource), x, y, angle, anchor);
+	}
+
+	/**
+	 * Zeichnet das angegebene Bild an den angegebenen Koordinaten mit der
+	 * angegebenen Drehung auf die Zeichenebene.
+	 * <p>
+	 * Das Bild wird um seinen Mittelpunkt als Rotationszentrum gedreht.
+	 *
+	 * @param image Ein Bild-Objekt.
+	 * @param x x-Koordinate des Ankerpunktes.
+	 * @param y y-Koordinate des Ankerpunktes.
+	 * @param angle Winkel in Grad.
+	 */
+	public void imageRotate( Image image, double x, double y, double angle ) {
+		imageRotateAndScale(image, x, y, angle, image.getWidth(null), image.getHeight(null), shapeDelegate.getAnchor());
+	}
+
+	/**
+	 * Zeichnet das angegebene Bild an den angegebenen Koordinaten mit der
+	 * angegebenen Drehung auf die Zeichenebene. Der angegebene Ankerpunkt wird
+	 * verwendet.
+	 * <p>
+	 * Das Bild wird um seinen Mittelpunkt als Rotationszentrum gedreht.
+	 *
+	 * @param image Ein Bild-Objekt.
+	 * @param x x-Koordinate des Ankerpunktes.
+	 * @param y y-Koordinate des Ankerpunktes.
+	 * @param angle Winkel in Grad.
+	 * @param anchor Der Ankerpunkt.
+	 */
+	public void imageRotate( Image image, double x, double y, double angle, Options.Direction anchor ) {
+		imageRotateAndScale(image, x, y, angle, image.getWidth(null), image.getHeight(null), anchor);
+	}
+
+	/**
+	 * Zeichnet das Bild von der angegebenen Bildquelle an den angegebenen
+	 * Koordinaten mit der angegebenen Drehung in der angegebenen Größe auf die
+	 * Zeichenebene.
+	 *
+	 * @param imageSource Die Bildquelle.
+	 * @param x x-Koordinate des Ankerpunktes.
+	 * @param y y-Koordinate des Ankerpunktes.
+	 * @param angle Winkel in Grad.
+	 * @param width Breite des Bildes auf der Zeichenebene oder 0.
+	 * @param height Höhe des Bildes auf der Zeichenebene oder 0.
+	 * @see #imageRotate(String, double, double, double)
+	 * @see #imageScale(Image, double, double, double)
+	 */
+	public void imageRotateAndScale( String imageSource, double x, double y, double angle, double width, double height ) {
+		imageRotateAndScale(ImageLoader.loadImage(imageSource), x, y, angle, width, height, shapeDelegate.getAnchor());
+	}
+
+	/**
+	 * Zeichnet das Bild von der angegebenen Bildquelle an den angegebenen
+	 * Koordinaten mit der angegebenen Drehung in der angegebenen Größe auf die
+	 * Zeichenebene. Der angegebene Ankerpunkt wird verwendet.
+	 *
+	 * @param imageSource Die Bildquelle.
+	 * @param x x-Koordinate des Ankerpunktes.
+	 * @param y y-Koordinate des Ankerpunktes.
+	 * @param angle Winkel in Grad.
+	 * @param width Breite des Bildes auf der Zeichenebene oder 0.
+	 * @param height Höhe des Bildes auf der Zeichenebene oder 0.
+	 * @param anchor Der Ankerpunkt.
+	 * @see #imageRotate(String, double, double, double)
+	 * @see #imageScale(Image, double, double, double)
+	 */
+	public void imageRotateAndScale( String imageSource, double x, double y, double angle, double width, double height, Options.Direction anchor ) {
+		imageRotateAndScale(ImageLoader.loadImage(imageSource), x, y, angle, width, height, anchor);
+	}
+
+	/**
+	 * Zeichnet das angegebene Bild an den angegebenen Koordinaten mit der
+	 * angegebenen Drehung in der angegebenen Größe auf die Zeichenebene. Der
+	 * angegebene Ankerpunkt wird verwendet.
+	 *
+	 * @param image Ein Bild-Objekt.
+	 * @param x x-Koordinate des Ankerpunktes.
+	 * @param y y-Koordinate des Ankerpunktes.
+	 * @param angle Winkel in Grad.
+	 * @param width Breite des Bildes auf der Zeichenebene oder 0.
+	 * @param height Höhe des Bildes auf der Zeichenebene oder 0.
+	 * @see #imageRotate(String, double, double, double)
+	 * @see #imageScale(Image, double, double, double)
+	 */
+	public void imageRotateAndScale( Image image, double x, double y, double angle, double width, double height ) {
+		imageRotateAndScale(image, x, y, angle, width, height, shapeDelegate.getAnchor());
+	}
+
+	/**
+	 * Zeichnet das angegebene Bild an den angegebenen Koordinaten mit der
+	 * angegebenen Drehung in der angegebenen Größe auf die Zeichenebene. Der
+	 * angegebene Ankerpunkt wird verwendet.
+	 *
+	 * @param image Ein Bild-Objekt.
+	 * @param x x-Koordinate des Ankerpunktes.
+	 * @param y y-Koordinate des Ankerpunktes.
+	 * @param angle Winkel in Grad.
+	 * @param width Breite des Bildes auf der Zeichenebene oder 0.
+	 * @param height Höhe des Bildes auf der Zeichenebene oder 0.
+	 * @param anchor Der Ankerpunkt.
+	 * @see #imageRotate(String, double, double, double)
+	 * @see #imageScale(Image, double, double, double)
+	 */
+	public void imageRotateAndScale( Image image, double x, double y, double angle, double width, double height, Options.Direction anchor ) {
 		// TODO: Use Validator or at least LOG a message if image == null?
 		if( image != null ) {
+			AffineTransform orig = drawing.getTransform();
+
+			int imgWidth = image.getWidth(null);
+			int imgHeight = image.getHeight(null);
+
 			if( width == 0 ) {
-				width = (height / image.getHeight(null)) * image.getWidth(null);
+				width = (height / imgHeight) * imgWidth;
 			} else if( height == 0 ) {
-				height = (width / image.getWidth(null)) * image.getHeight(null);
+				height = (width / imgWidth) * imgHeight;
 			}
 
 			Point2D.Double anchorPoint = getOriginPoint(x, y, width, height, anchor);
+			drawing.rotate(Math.toRadians(angle), anchorPoint.x + width / 2, anchorPoint.y + height / 2);
 			drawing.drawImage(image, (int) anchorPoint.x, (int) anchorPoint.y, (int) width, (int) height, null);
+
+			drawing.setTransform(orig);
 		}
 	}
 

src/main/java/schule/ngb/zm/layers/ShapesLayer.java

@@ -159,6 +159,16 @@ public class ShapesLayer extends Layer {
 	@Override
 	public void update( double delta ) {
 		if( updateShapes ) {
+			synchronized( shapes ) {
+				List<Updatable> uit = List.copyOf(updatables);
+				for( Updatable u : uit ) {
+					if( u.isActive() ) {
+						u.update(delta);
+					}
+				}
+			}
+
+			/*
 			Iterator<Updatable> uit = updatables.iterator();
 			while( uit.hasNext() ) {
 				Updatable u = uit.next();
@@ -166,6 +176,7 @@ public class ShapesLayer extends Layer {
 					u.update(delta);
 				}
 			}
+			*/
 		}
 
 		Iterator<Animation<? extends Shape>> it = animations.iterator();

src/main/java/schule/ngb/zm/layers/TurtleLayer.java

@@ -230,6 +230,11 @@ public class TurtleLayer extends Layer implements Strokeable, Fillable {
 		return mainTurtle.getStrokeType();
 	}
 
+	@Override
+	public Options.StrokeJoin getStrokeJoin() {
+		return mainTurtle.getStrokeJoin();
+	}
+
 	@Override
 	public void setStrokeType( Options.StrokeType type ) {
 		mainTurtle.setStrokeType(type);

src/main/java/schule/ngb/zm/particles/BasicParticle.java

@@ -0,0 +1,77 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.Color;
+import schule.ngb.zm.Vector;
+
+import java.awt.Graphics2D;
+
+public class BasicParticle extends Particle {
+
+	protected Color color, startColor, finalColor;
+
+
+	public BasicParticle() {
+		super();
+	}
+
+	public BasicParticle( Color startColor ) {
+		this(startColor, null);
+	}
+
+	public BasicParticle( Color startColor, Color finalColor ) {
+		super();
+
+		this.color = startColor;
+		this.startColor = startColor;
+		this.finalColor = finalColor;
+	}
+
+	public Color getColor() {
+		return color;
+	}
+
+	public void setColor( Color pColor ) {
+		this.color = pColor;
+	}
+
+	public Color getStartColor() {
+		return startColor;
+	}
+
+	public void setStartColor( Color pStartColor ) {
+		this.startColor = pStartColor;
+	}
+
+	public Color getFinalColor() {
+		return finalColor;
+	}
+
+	public void setFinalColor( Color pFinalColor ) {
+		this.finalColor = pFinalColor;
+	}
+
+	@Override
+	public void spawn( int pLifetime, Vector pPosition, Vector pVelocity ) {
+		super.spawn(pLifetime, pPosition, pVelocity);
+		this.color = this.startColor;
+	}
+
+	@Override
+	public void update( double delta ) {
+		super.update(delta);
+
+		if( isActive() && startColor != null && finalColor != null ) {
+			double t = 1.0 - lifetime / maxLifetime;
+			this.color = Color.interpolate(startColor, finalColor, t);
+		}
+	}
+
+	@Override
+	public void draw( Graphics2D graphics ) {
+		if( isActive() && this.color != null ) {
+			graphics.setColor(this.color.getJavaColor());
+			graphics.fillOval(position.getIntX() - 3, position.getIntY() - 3, 6, 6);
+		}
+	}
+
+}

src/main/java/schule/ngb/zm/particles/BasicParticleFactory.java

@@ -0,0 +1,43 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.Color;
+
+public class BasicParticleFactory implements ParticleFactory {
+
+	private final Color startColor;
+
+	private final Color finalColor;
+
+	private boolean fadeOut = true;
+
+	public BasicParticleFactory() {
+		this(null, null);
+	}
+
+	public BasicParticleFactory( Color startColor ) {
+		this(startColor, null);
+	}
+
+	public BasicParticleFactory( Color startColor, Color finalColor ) {
+		this.startColor = startColor;
+		this.finalColor = finalColor;
+	}
+
+	public void setFadeOut( boolean pFadeOut ) {
+		this.fadeOut = pFadeOut;
+	}
+
+	@Override
+	public Particle createParticle() {
+		Color finalClr = finalColor;
+		if( fadeOut ) {
+			if( finalColor != null ) {
+				finalClr = new Color(finalColor, 0);
+			} else if( startColor != null ) {
+				finalClr = new Color(startColor, 0);
+			}
+		}
+		return new BasicParticle(startColor, finalClr);
+	}
+
+}

src/main/java/schule/ngb/zm/particles/GenericParticleFactory.java

@@ -0,0 +1,49 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.util.Log;
+
+import java.util.Arrays;
+import java.util.function.Supplier;
+
+public class GenericParticleFactory<T extends Particle> implements ParticleFactory {
+
+	private final Class<T> type;
+
+	private final Supplier<T> supplier;
+
+	public GenericParticleFactory( Class<T> type, Object... params ) {
+		this.type = type;
+
+		// Create paramTypes array once
+		Class<?>[] paramTypes = new Class<?>[params.length];
+		for( int i = 0; i < params.length; i++ ) {
+			paramTypes[i] = params[i].getClass();
+		}
+
+		this.supplier = () -> {
+			T p = null;
+			try {
+				p = GenericParticleFactory.this.type.getDeclaredConstructor(paramTypes).newInstance(params);
+			} catch( Exception ex ) {
+				LOG.error( ex,
+					"Unable to create new Particle of type %s",
+					GenericParticleFactory.this.type.getCanonicalName()
+				);
+			}
+			return p;
+		};
+	}
+
+	public GenericParticleFactory( Supplier<T> supplier ) {
+		this.supplier = supplier;
+		this.type = (Class<T>)supplier.get().getClass();
+	}
+
+	@Override
+	public Particle createParticle() {
+		return this.supplier.get();
+	}
+
+	private static final Log LOG = Log.getLogger(GenericParticleFactory.class);
+
+}

src/main/java/schule/ngb/zm/particles/Particle.java

@@ -0,0 +1,60 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.Drawable;
+import schule.ngb.zm.Updatable;
+import schule.ngb.zm.Vector;
+
+
+public abstract class Particle extends PhysicsObject implements Updatable, Drawable {
+
+	protected double maxLifetime = 0, lifetime = 0;
+
+
+	public Particle() {
+		super();
+	}
+
+	public void spawn( int pLifetime, Vector pPosition, Vector pVelocity ) {
+		this.maxLifetime = pLifetime;
+		this.lifetime = pLifetime;
+		this.position = pPosition.copy();
+		this.velocity = pVelocity.copy();
+		this.acceleration = new Vector();
+	}
+
+	@Override
+	public boolean isActive() {
+		return lifetime > 0;
+	}
+
+	@Override
+	public boolean isVisible() {
+		return isActive();
+	}
+
+	public double getLifetime() {
+		return lifetime;
+	}
+
+	public void setLifetime( double pLifetime ) {
+		this.lifetime = pLifetime;
+	}
+
+	public double getMaxLifetime() {
+		return maxLifetime;
+	}
+
+	public void setMaxLifetime( double pMaxLifetime ) {
+		this.maxLifetime = pMaxLifetime;
+	}
+
+	@Override
+	public void update( double delta ) {
+		super.update(delta);
+		// lifetime -= delta;
+		lifetime -= 1;
+
+		// TODO: (ngb) calculate delta based on lifetime?
+	}
+
+}

src/main/java/schule/ngb/zm/particles/ParticleEmitter.java

@@ -0,0 +1,174 @@
+package schule.ngb.zm.particles;
+
+
+import schule.ngb.zm.Drawable;
+import schule.ngb.zm.Updatable;
+import schule.ngb.zm.Vector;
+
+import java.awt.Graphics2D;
+
+public class ParticleEmitter implements Updatable, Drawable {
+
+	protected ParticleFactory particleFactory;
+
+	private int particlesPerFrame;
+
+	private int particleLifetime = 180;
+
+	private Particle[] particles;
+
+	private boolean active = false;
+
+	private Particle nextParticle;
+
+	public Vector position;
+
+	public Vector direction = new Vector();
+
+	public double strength = 100.0;
+
+	public int angle = 0;
+
+	public double randomness = 0.0;
+
+	// private Vortex vortex = null;
+
+	public ParticleEmitter( double pX, double pY, int pParticleLifetime, int pParticlesPerFrame, ParticleFactory pFactory ) {
+		this.position = new Vector(pX, pY);
+		this.particlesPerFrame = pParticlesPerFrame;
+		this.particleLifetime = pParticleLifetime;
+		this.particleFactory = pFactory;
+
+		// Create particle pool
+		this.particles = new Particle[particlesPerFrame * pParticleLifetime];
+		this.direction = Vector.random(8, 16).normalize();
+
+		// vortex = new Vortex(position.copy().add(-10, -10), -.2, 8);
+	}
+
+	@Override
+	public boolean isActive() {
+		return active;
+	}
+
+	@Override
+	public boolean isVisible() {
+		return active;
+	}
+
+	public void start() {
+		this.direction.normalize();
+
+		// Partikel initialisieren
+		for( int i = 0; i < particles.length; i++ ) {
+			particles[i] = particleFactory.createParticle();
+		}
+
+		active = true;
+	}
+
+	public void stop() {
+		for( int i = 0; i < particles.length; i++ ) {
+			particles[i].setLifetime(0);
+			particles[i] = null;
+		}
+		active = false;
+	}
+
+	private Particle getNextParticle() {
+		// TODO: improve by caching next particle
+		for( Particle p : particles ) {
+			if( p != null && !p.isActive() ) {
+				return p;
+			}
+		}
+		return null;
+	}
+
+	public void emitParticle() {
+		int ppf = particlesPerFrame;
+		Particle nextParticle = getNextParticle();
+		while( ppf > 0 && nextParticle != null ) {
+			int lifetime = (int) random(particleLifetime);
+
+			double rotation = (angle / 2.0) - (int) (Math.random() * angle);
+			Vector velocity = direction.copy().scale(strength).rotate(rotation);
+			velocity.scale(random());
+
+			nextParticle.spawn(lifetime, this.position, velocity);
+			nextParticle = getNextParticle();
+			ppf -= 1;
+		}
+	}
+
+	@Override
+	public void update( double delta ) {
+		emitParticle();
+
+		boolean _active = false;
+		for( Particle particle : particles ) {
+			if( particle != null ) {
+				if( particle.isActive() ) {
+//					if( vortex != null ) {
+//						vortex.attract(particle);
+//					}
+					particle.update(delta);
+					_active = true;
+				}
+			}
+		}
+		this.active = _active;
+	}
+
+	private double random() {
+		return 1.0 - (Math.random() * randomness);
+	}
+
+	private double random( double pZahl ) {
+		return pZahl * random();
+	}
+
+	@Override
+	public void draw( Graphics2D graphics ) {
+		java.awt.Color current = graphics.getColor();
+		for( Particle particle : particles ) {
+			if( particle != null && particle.isVisible() ) {
+				particle.draw(graphics);
+			}
+		}
+
+//		if( vortex != null ) {
+//			graphics.setColor(java.awt.Color.BLACK);
+//			double vscale = (4 * vortex.scale);
+//			graphics.fillOval((int) (vortex.position.x - vscale * .5), (int) (vortex.position.y - vscale * .5), (int) vscale, (int) vscale);
+//		}
+		graphics.setColor(current);
+	}
+
+
+	class Vortex {
+
+		Vector position;
+
+		double speed = 1.0, scale = 1.0;
+
+		public Vortex( Vector pPosition, double pSpeed, double pScale ) {
+			this.position = pPosition.copy();
+			this.scale = pScale;
+			this.speed = pSpeed;
+		}
+
+		public void attract( Particle pPartikel ) {
+			Vector diff = Vector.sub(pPartikel.position, this.position);
+			double dx = -diff.y * this.speed;
+			double dy = diff.x * this.speed;
+			double f = 1.0 / (1.0 + (dx * dx + dy * dy) / scale);
+
+			pPartikel.position.x += (diff.x - pPartikel.velocity.x) * f;
+			pPartikel.position.y += (diff.y - pPartikel.velocity.y) * f;
+
+		}
+
+	}
+
+}

src/main/java/schule/ngb/zm/particles/ParticleFactory.java

@@ -0,0 +1,7 @@
+package schule.ngb.zm.particles;
+
+public interface ParticleFactory {
+
+	Particle createParticle();
+
+}

src/main/java/schule/ngb/zm/particles/PhysicsObject.java

@@ -0,0 +1,69 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.Updatable;
+import schule.ngb.zm.Vector;
+
+
+public abstract class PhysicsObject implements Updatable {
+
+	protected Vector position, velocity, acceleration;
+
+	protected double mass = 1.0;
+
+
+	public PhysicsObject() {
+		position = new Vector();
+		velocity = new Vector();
+		acceleration = new Vector();
+	}
+
+	public PhysicsObject( Vector pPosition ) {
+		position = pPosition.copy();
+		velocity = new Vector();
+		acceleration = new Vector();
+	}
+
+	public Vector getAcceleration() {
+		return acceleration;
+	}
+
+	public void setAcceleration( Vector pAcceleration ) {
+		this.acceleration = pAcceleration;
+	}
+
+	public double getMass() {
+		return mass;
+	}
+
+	public void setMass( double pMass ) {
+		this.mass = pMass;
+	}
+
+	public Vector getPosition() {
+		return position;
+	}
+
+	public void setPosition( Vector pPosition ) {
+		this.position = pPosition;
+	}
+
+	public Vector getVelocity() {
+		return velocity;
+	}
+
+	public void setVelocity( Vector pVelocity ) {
+		this.velocity = pVelocity;
+	}
+
+	public void accelerate( Vector pAcceleration ) {
+		acceleration.add(Vector.div(pAcceleration, mass));
+	}
+
+	@Override
+	public void update( double delta ) {
+		velocity.add(acceleration);
+		position.add(Vector.scale(velocity, delta));
+		acceleration.scale(0.0);
+	}
+
+}

src/main/java/schule/ngb/zm/particles/StarParticle.java

@@ -0,0 +1,35 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.Color;
+
+import java.awt.Graphics2D;
+
+public class StarParticle extends BasicParticle {
+
+	public StarParticle() {
+		super();
+		this.startColor = Color.PURE_GREEN;
+	}
+
+	public StarParticle( Color startColor ) {
+		this(startColor, null);
+	}
+
+	public StarParticle( Color startColor, Color finalColor ) {
+		super();
+
+		this.color = startColor;
+		this.startColor = startColor;
+		this.finalColor = finalColor;
+	}
+
+	@Override
+	public void draw( Graphics2D graphics ) {
+		if( isActive() && this.color != null ) {
+			graphics.setColor(this.color.getJavaColor());
+			graphics.drawLine((int) position.x - 3, (int) position.y - 3, (int) position.x + 3, (int) position.y + 3);
+			graphics.drawLine((int) position.x + 3, (int) position.y - 3, (int) position.x - 3, (int) position.y + 3);
+		}
+	}
+
+}

src/main/java/schule/ngb/zm/shapes/Curve.java

@@ -1,5 +1,9 @@
 package schule.ngb.zm.shapes;
 
+import schule.ngb.zm.Options;
+
+import java.awt.Graphics2D;
+import java.awt.geom.AffineTransform;
 import java.awt.geom.CubicCurve2D;
 import java.awt.geom.Point2D;
 import java.awt.geom.QuadCurve2D;
@@ -170,6 +174,30 @@ public class Curve extends Shape {
 		move(dx, dy);
 	}
 
+	@Override
+	public void draw( Graphics2D graphics, AffineTransform transform ) {
+		if( !visible ) {
+			return;
+		}
+
+		AffineTransform orig = graphics.getTransform();
+		if( transform != null ) {
+			//graphics.transform(transform);
+		}
+
+		graphics.translate(x, y);
+		graphics.rotate(Math.toRadians(rotation));
+
+		java.awt.Shape shape = getShape();
+
+		java.awt.Color currentColor = graphics.getColor();
+		fillShape(shape, graphics);
+		strokeShape(shape, graphics);
+		graphics.setColor(currentColor);
+
+		graphics.setTransform(orig);
+	}
+
 	@Override
 	public boolean equals( Object o ) {
 		if( this == o ) return true;

src/main/java/schule/ngb/zm/shapes/CustomShape.java

@@ -11,6 +11,7 @@ public class CustomShape extends Shape {
 	public CustomShape( double x, double y ) {
 		super(x, y);
 		path = new Path2D.Double();
+		path.moveTo(x, y);
 	}
 
 	public CustomShape( CustomShape custom ) {
@@ -36,7 +37,7 @@ public class CustomShape extends Shape {
 	}
 
 	public void lineTo( double x, double y ) {
-		path.lineTo(x - x, y - y);
+		path.lineTo(x - this.x, y - this.y);
 		calculateBounds();
 	}
 

src/main/java/schule/ngb/zm/shapes/Shape.java

@@ -404,6 +404,7 @@ public abstract class Shape extends BasicDrawable {
 			setStrokeColor(shape.getStrokeColor());
 			setStrokeWeight(shape.getStrokeWeight());
 			setStrokeType(shape.getStrokeType());
+			setStrokeJoin(shape.getStrokeJoin());
 			visible = shape.isVisible();
 			rotation = shape.getRotation();
 			scale(shape.getScale());

src/main/java/schule/ngb/zm/util/io/FileLoader.java

@@ -181,34 +181,39 @@ public final class FileLoader {
 		).toArray(String[][]::new);
 	}
 
-	public static double[][] loadValues( String source, char separator, boolean skipFirst ) {
+	public static double[][] loadValues( String source, String separator, boolean skipFirst ) {
 		return loadValues(source, separator, skipFirst, UTF8);
 	}
 
 	/**
-	 * Lädt Double-Werte aus einer CSV Datei in ein zweidimensionales Array.
+	 * Lädt Double-Werte aus einer Text-Datei in ein zweidimensionales Array.
 	 * <p>
-	 * Die gelesenen Strings werden mit {@link Double#parseDouble(String)} in
-	 * {@code double} umgeformt. Es leigt in der Verantwortung des Nutzers
-	 * sicherzustellen, dass die CSV-Datei auch nur Zahlen enthält, die korrekt
-	 * in {@code double} umgewandelt werden können. Zellen für die die
-	 * Umwandlung fehlschlägt werden mit 0.0 befüllt.
+	 * Die Zeilen der Eingabedatei werden anhand der Zeichenkette {@code separator}
+	 * in einzelne Teile aufgetrennt. {@code separator} wird als regulärer Ausdruck
+	 * interpretiert (siehe {@link String#split(String)}).
+	 * <p>
+	 * Jeder Teilstring wird mit {@link Double#parseDouble(String)} in
+	 * {@code double} umgeformt. Es liegt in der Verantwortung des Nutzers,
+	 * sicherzustellen, dass die Eingabedatei nur Zahlen enthält, die korrekt
+	 * in {@code double} umgewandelt werden können. Zellen, für die die
+	 * Umwandlung fehlschlägt, werden mit 0.0 befüllt.
 	 * <p>
 	 * Die Methode unterliegt denselben Einschränkungen wie
 	 * {@link #loadCsv(String, char, boolean, Charset)}.
 	 *
 	 * @param source Die Quelle der CSV-Daten.
-	 * @param separator Das verwendete Trennzeichen.
+	 * @param separator Ein Trennzeichen oder ein regulärer Ausdruck.
 	 * @param skipFirst Ob die erste Zeile übersprungen werden soll.
 	 * @param charset Die zu verwendende Zeichenkodierung.
 	 * @return Ein Array mit den Daten als {@code String}s.
 	 */
-	public static double[][] loadValues( String source, char separator, boolean skipFirst, Charset charset ) {
+	public static double[][] loadValues( String source, String separator, boolean skipFirst, Charset charset ) {
 		int n = skipFirst ? 1 : 0;
 		List<String> lines = loadLines(source, charset);
 		return lines.stream().skip(n).map(
 			( line ) -> Arrays
-				.stream(line.split(Character.toString(separator)))
+				//.stream(line.split(Character.toString(separator)))
+				.stream(line.split(separator))
 				.mapToDouble(
 					( value ) -> {
 						try {

src/test/java/schule/ngb/zm/ColorTest.java

@@ -262,6 +262,8 @@ class ColorTest {
 
 		assertEquals(0.0, Color.BLACK.compare(Color.WHITE), 0.0001);
 		assertEquals(0.0, Color.WHITE.compare(Color.BLACK), 0.0001);
+
+		assertEquals(0.5, Color.GRAY.compare(Color.BLACK), 0.01);
 	}
 
 }

src/test/java/schule/ngb/zm/Testmaschine.java

@@ -0,0 +1,51 @@
+package schule.ngb.zm;
+
+
+import schule.ngb.zm.layers.DrawingLayer;
+import schule.ngb.zm.util.Log;
+
+public class Testmaschine extends Zeichenmaschine {
+
+	static {
+		Log.enableGlobalDebugging();
+	}
+
+	private DrawingLayer gridLayer;
+
+	public Testmaschine() {
+		this(400, 400);
+	}
+
+	public Testmaschine( int width, int height ) {
+		super(width, height, "Testmaschine", false);
+	}
+
+	@Override
+	public void settings() {
+		gridLayer = new DrawingLayer(getWidth(), getHeight());
+		this.getCanvas().addLayer(1, gridLayer);
+		setGrid(50, 10);
+	}
+
+	public void setGrid( int majorGrid, int minorGrid ) {
+		gridLayer.clear();
+
+		gridLayer.clear(LIGHTGRAY);
+		gridLayer.setStrokeColor(LIGHTGRAY.darker(20));
+		for( int i = 0; i < getWidth(); i += minorGrid ) {
+			gridLayer.line(i, 0, i, gridLayer.getHeight());
+		}
+		for( int i = 0; i < getHeight(); i += minorGrid ) {
+			gridLayer.line(0, i, gridLayer.getWidth(), i);
+		}
+
+		gridLayer.setStrokeColor(LIGHTGRAY.darker(50));
+		for( int i = 0; i < getWidth(); i += majorGrid ) {
+			gridLayer.line(i, 0, i, gridLayer.getHeight());
+		}
+		for( int i = 0; i < getHeight(); i += majorGrid ) {
+			gridLayer.line(0, i, gridLayer.getWidth(), i);
+		}
+	}
+
+}

src/test/java/schule/ngb/zm/TestmaschineTest.java

@@ -0,0 +1,71 @@
+package schule.ngb.zm;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import schule.ngb.zm.layers.DrawingLayer;
+import schule.ngb.zm.util.io.ImageLoader;
+
+import java.awt.Graphics2D;
+import java.awt.image.BufferedImage;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static schule.ngb.zm.util.test.ImageAssertions.assertEquals;
+import static schule.ngb.zm.util.test.ImageAssertions.setSaveDiffImageOnFail;
+
+public class TestmaschineTest {
+
+	private static Testmaschine tm;
+
+	private static DrawingLayer drawing;
+
+	@BeforeAll
+	static void beforeAll() {
+		setSaveDiffImageOnFail(true);
+
+		tm = new Testmaschine();
+		drawing = tm.getDrawingLayer();
+		assertNotNull(drawing);
+	}
+
+	@AfterAll
+	static void afterAll() {
+		tm.exit();
+	}
+
+	@BeforeEach
+	void setUp() {
+		drawing.clear();
+	}
+
+	@Test
+	void testSaveDiffImage() {
+		drawing.noStroke();
+		drawing.setAnchor(Constants.NORTHWEST);
+		drawing.setFillColor(Constants.BLUE);
+		drawing.rect(0, 0, 400, 400);
+		drawing.setFillColor(Constants.RED);
+		drawing.rect(100, 100, 200, 200);
+
+		BufferedImage img1 = ImageLoader.createImage(400, 400);
+		Graphics2D graphics = img1.createGraphics();
+
+		graphics.setColor(Constants.BLUE.getJavaColor());
+		graphics.fillRect(0, 0, 400, 400);
+		graphics.setColor(Constants.RED.getJavaColor());
+		graphics.fillRect(100, 100, 200, 200);
+
+		assertEquals(drawing.buffer, drawing.buffer);
+		assertEquals(ImageLoader.copyImage(drawing.buffer), drawing.buffer);
+		assertEquals(img1, drawing.buffer);
+		assertEquals(img1, tm.getImage());
+	}
+
+	@Test
+	void testGrid() {
+//		tm.setGrid(50, 10);
+		tm.delay(2000);
+	}
+
+}

src/test/java/schule/ngb/zm/anim/AnimationGroupsTest.java

@@ -0,0 +1,96 @@
+package schule.ngb.zm.anim;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import schule.ngb.zm.Color;
+import schule.ngb.zm.Testmaschine;
+import schule.ngb.zm.Zeichenmaschine;
+import schule.ngb.zm.layers.ShapesLayer;
+import schule.ngb.zm.shapes.Circle;
+import schule.ngb.zm.shapes.Shape;
+
+import java.util.Arrays;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+class AnimationGroupsTest {
+
+	private static Testmaschine zm;
+
+	private static ShapesLayer shapes;
+
+	@BeforeAll
+	static void beforeAll() {
+		zm = new Testmaschine();
+		shapes = zm.getShapesLayer();
+		assertNotNull(shapes);
+	}
+
+	@AfterAll
+	static void afterAll() {
+		zm.exit();
+	}
+
+	@BeforeEach
+	void setUp() {
+		shapes.removeAll();
+	}
+
+	@Test
+	void animationGroup() {
+		Shape s = new Circle(0, 0, 10);
+		shapes.add(s);
+
+		Animation<Shape> anims = new AnimationGroup<>(
+			500,
+			Arrays.asList(
+				new MoveAnimation(s, 200, 200, 2000, Easing.DEFAULT_EASING),
+				new FillAnimation(s, Color.GREEN, 1000, Easing.sineIn())
+			)
+		);
+		Animations.playAndWait(anims);
+		assertEquals(200, s.getX());
+		assertEquals(200, s.getY());
+		assertEquals(Color.GREEN, s.getFillColor());
+	}
+
+	@Test
+	void animationSequence() {
+		Shape s = new Circle(0, 0, 10);
+		shapes.add(s);
+
+		Animation<Shape> anims = new AnimationSequence<>(
+			Arrays.asList(
+				new CircleAnimation(s, 200, 0, 90, false, 1000, Easing::rushIn),
+				new CircleAnimation(s, 200, 400, 90, 1000, Easing::rushOut),
+				new CircleAnimation(s, 200, 400, 90, false, 1000, Easing::rushIn),
+				new CircleAnimation(s, 200, 0, 90, 1000, Easing::rushOut)
+			)
+		);
+		Animations.playAndWait(anims);
+		assertEquals(0, s.getX());
+		assertEquals(0, s.getY());
+	}
+
+	@Test
+	void animationSequenceContinous() {
+		Shape s = new Circle(0, 0, 10);
+		shapes.add(s);
+
+		Animation<Shape> anims = new ContinousAnimation<>(new AnimationSequence<>(
+			Arrays.asList(
+				new CircleAnimation(s, 200, 0, 90, false, 1000, Easing::rushIn),
+				new CircleAnimation(s, 200, 400, 90, 1000, Easing::rushOut),
+				new CircleAnimation(s, 200, 400, 90, false, 1000, Easing::rushIn),
+				new CircleAnimation(s, 200, 0, 90, 1000, Easing::rushOut)
+			)
+		), false);
+		Animations.playAndWait(anims);
+		zm.delay(8000);
+		anims.stop();
+	}
+
+}

src/test/java/schule/ngb/zm/anim/AnimationTest.java

@@ -0,0 +1,75 @@
+package schule.ngb.zm.anim;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import schule.ngb.zm.Testmaschine;
+import schule.ngb.zm.layers.ShapesLayer;
+import schule.ngb.zm.shapes.Circle;
+import schule.ngb.zm.shapes.Shape;
+import schule.ngb.zm.util.test.TestEnv;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class AnimationTest {
+
+	private static Testmaschine zm;
+
+	private static ShapesLayer shapes;
+
+	@BeforeAll
+	static void beforeAll() {
+		zm = new Testmaschine();
+		shapes = zm.getShapesLayer();
+		assertNotNull(shapes);
+	}
+
+	@AfterAll
+	static void afterAll() {
+		zm.exit();
+	}
+
+	@BeforeEach
+	void setUp() {
+		shapes.removeAll();
+	}
+
+	@Test
+	void circleAnimation() {
+		Shape s = new Circle(zm.getWidth()/4.0, zm.getHeight()/2.0, 10);
+		shapes.add(s);
+
+		CircleAnimation anim = new CircleAnimation(s, zm.getWidth()/2.0, zm.getHeight()/2.0, 360, true, 3000, Easing::linear);
+		Animations.playAndWait(anim);
+		assertEquals(zm.getWidth()/4.0, s.getX());
+		assertEquals(zm.getHeight()/2.0, s.getY());
+	}
+
+	@Test
+	void fadeAnimation() {
+		Shape s = new Circle(zm.getWidth()/4.0, zm.getHeight()/2.0, 10);
+		s.setFillColor(s.getFillColor(), 0);
+		s.setStrokeColor(s.getStrokeColor(), 0);
+		shapes.add(s);
+
+		Animation<Shape> anim = new FadeAnimation(s, 255, 1000);
+		Animations.playAndWait(anim);
+		assertEquals(s.getFillColor().getAlpha(), 255);
+	}
+
+	@Test
+	void continousAnimation() {
+		Shape s = new Circle(zm.getWidth()/4, zm.getHeight()/2, 10);
+		shapes.add(s);
+
+		ContinousAnimation anim = new ContinousAnimation(
+			new CircleAnimation(s, zm.getWidth()/2, zm.getHeight()/2, 360, true, 1000, Easing::linear)
+		);
+		Animations.play(anim);
+		zm.delay(3000);
+		anim.stop();
+	}
+
+}

src/test/java/schule/ngb/zm/layers/DrawingLayerTest.java

@@ -0,0 +1,30 @@
+package schule.ngb.zm.layers;
+
+import org.junit.jupiter.api.Test;
+import schule.ngb.zm.Constants;
+import schule.ngb.zm.Zeichenmaschine;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class DrawingLayerTest {
+
+	@Test
+	void imageRotateAndScale() {
+		Zeichenmaschine zm = new Zeichenmaschine();
+		zm.getDrawingLayer().imageRotateAndScale(
+			"WitchCraftIcons_122_t.PNG",
+			50, 100,
+			90,
+			300, 200,
+			Constants.NORTHWEST
+		);
+		zm.redraw();
+
+		try {
+			Thread.sleep(4000);
+		} catch( InterruptedException e ) {
+			throw new RuntimeException(e);
+		}
+	}
+
+}

src/test/java/schule/ngb/zm/particles/ParticleExample.java

@@ -0,0 +1,158 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.*;
+import schule.ngb.zm.layers.DrawableLayer;
+import schule.ngb.zm.layers.DrawingLayer;
+
+import java.awt.Graphics2D;
+
+public class ParticleExample extends Testmaschine {
+
+	public static void main( String[] args ) {
+		new ParticleExample();
+	}
+
+	public ParticleExample() {
+		super();
+	}
+
+	ParticleEmitter pe1, pe2, pe3;
+
+	Rocket r;
+
+	public void setup() {
+		getLayer(DrawingLayer.class).hide();
+		background.setColor(0);
+		drawing.noStroke();
+		drawing.setFillColor(WHITE);
+		for( int i = 0; i < 1000; i++ ) {
+			drawing.point(random(0, canvasWidth), random(0, canvasHeight));
+		}
+
+		pe1 = new ParticleEmitter(
+			100, 100, 50, 5,
+			// new BasicParticleFactory(PINK, BLUE)
+			new GenericParticleFactory<Particle>(() -> {
+				return new Particle() {
+					@Override
+					public void draw( Graphics2D graphics ) {
+						graphics.setColor(Color.MAGENTA.getJavaColor());
+						graphics.rotate(Constants.radians(45), (int) position.x, (int) position.y);
+						graphics.drawRect((int) position.x - 3, (int) position.y - 3, 6, 6);
+						graphics.rotate(Constants.radians(-45), (int) position.x, (int) position.y);
+					}
+				};
+			})
+		);
+		pe1.randomness = .2;
+		pe1.angle = 45;
+		pe1.strength = 200;
+
+
+		pe2 = new ParticleEmitter(
+			300, 300, 50, 10,
+			new GenericParticleFactory(() -> new StarParticle(RED, new Color(BLUE, 55)))
+			//new GenericParticleFactory(StarParticle.class, RED, new Color(BLUE, 55))
+		);
+		pe2.direction = NORTH.asVector().scale(100);
+		pe2.randomness = .8;
+		pe2.angle = 90;
+		pe2.strength = 200;
+
+
+		pe3 = new ParticleEmitter(
+			100, 400, 20, 8,
+			new BasicParticleFactory(YELLOW, RED)
+		);
+		pe3.direction = SOUTH.asVector();
+		pe3.randomness = .33;
+		pe3.angle = 30;
+
+		DrawableLayer drawables = new DrawableLayer();
+		addLayer(drawables);
+		drawables.add(pe1, pe2, pe3);
+
+		pe1.start();
+		pe2.start();
+		pe3.start();
+
+		r = new Rocket(200, 400);
+		drawables.add(r);
+		r.start();
+	}
+
+	@Override
+	public void update( double delta ) {
+		pe1.update(delta);
+		pe2.update(delta);
+		pe3.update(delta);
+		pe3.position.add(NORTH.asVector().scale(Constants.map(runtime, 0, 1000, 0, 10) * delta));
+
+		if( r.isActive() ) {
+			r.update(delta);
+		}
+	}
+
+	class Rocket extends PhysicsObject implements Drawable {
+
+		ParticleEmitter trail;
+
+		private boolean starting = false;
+
+		private double acc = 4;
+
+		public Rocket( double x, double y ) {
+			super(new Vector(x, y));
+			trail = new ParticleEmitter(
+				x, y, 30, 6,
+				new BasicParticleFactory(YELLOW, RED)
+			);
+			trail.direction = SOUTH.asVector();
+			trail.randomness = .33;
+			trail.angle = 30;
+			trail.position = this.position;
+		}
+
+		public void start() {
+			starting = true;
+			trail.start();
+		}
+
+		@Override
+		public boolean isActive() {
+			return starting;
+		}
+
+		@Override
+		public boolean isVisible() {
+			return true;
+		}
+
+		@Override
+		public void update( double delta ) {
+			super.update(delta);
+			if( this.acceleration.lengthSq() < acc * acc ) {
+				this.accelerate(NORTHWEST.asVector().scale(acc));
+			}
+
+			trail.update(delta);
+		}
+
+		@Override
+		public void draw( Graphics2D graphics ) {
+			graphics.rotate(-Constants.radians(velocity.angle() + 180), position.getIntX(), position.getIntY());
+			trail.draw(graphics);
+
+			graphics.setColor(WHITE.getJavaColor());
+			graphics.fillRect(position.getIntX() - 6, position.getIntY() - 32, 12, 32);
+			graphics.fillPolygon(
+				new int[]{position.getIntX() - 6, position.getIntX(), position.getIntX() + 6},
+				new int[]{position.getIntY() - 32, position.getIntY() - 40, position.getIntY() - 32},
+				3
+			);
+			graphics.rotate(Constants.radians(velocity.angle() + 180), position.getIntX(), position.getIntY());
+		}
+
+	}
+
+}

src/test/java/schule/ngb/zm/util/FileLoaderTest.java

@@ -72,10 +72,10 @@ class FileLoaderTest {
 			{2.1,2.2,2.3},
 			{3.1,3.2,3.3}
 		};
-		csv = FileLoader.loadValues("data_comma.csv", ',', true);
+		csv = FileLoader.loadValues("data_comma.csv", ",", true);
 		assertArrayEquals(data, csv);
 
-		csv = FileLoader.loadValues("data_semicolon_latin.csv", ';', true, FileLoader.ISO_8859_1);
+		csv = FileLoader.loadValues("data_semicolon_latin.csv", ";", true, FileLoader.ISO_8859_1);
 		assertArrayEquals(data, csv);
 	}
 

src/test/java/schule/ngb/zm/util/test/ImageAssertions.java

@@ -0,0 +1,165 @@
+package schule.ngb.zm.util.test;
+
+import org.junit.jupiter.api.Assertions;
+import org.opentest4j.AssertionFailedError;
+import schule.ngb.zm.util.io.ImageLoader;
+
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import java.util.function.Supplier;
+
+public final class ImageAssertions {
+
+	private static boolean SAVE_DIFF_IMAGE_ON_FAIL = false;
+
+	private static File DIFF_IMAGE_PATH = new File("build/test-results/diff");
+
+	private static AssertionFailedError ASSERTION_FAILED_ERROR = null;
+
+
+	public static boolean isSaveDiffImageOnFail() {
+		return SAVE_DIFF_IMAGE_ON_FAIL;
+	}
+
+	public static final void setSaveDiffImageOnFail( boolean saveOnFail ) {
+		SAVE_DIFF_IMAGE_ON_FAIL = saveOnFail;
+	}
+
+	public static File getDiffImagePath() {
+		return DIFF_IMAGE_PATH;
+	}
+
+	public static void assertEquals( BufferedImage expected, BufferedImage actual ) {
+		assertEquals(expected, actual, () -> "Actual image differs from expected buffer.");
+	}
+
+	public static void assertEquals( BufferedImage expected, BufferedImage actual, String message ) {
+		assertEquals(expected, actual, () -> message);
+	}
+
+	public static void assertEquals( BufferedImage expected, BufferedImage actual, Supplier<String> messageSupplier ) {
+		// Compare image dimensions
+		int expectedHeight = expected.getHeight(), expectedWidth = expected.getWidth();
+		int actualHeight = actual.getHeight(), actualWidth = actual.getWidth();
+		try {
+			Assertions.assertEquals(expectedHeight, actualHeight);
+			Assertions.assertEquals(expectedWidth, actualWidth);
+		} catch( AssertionFailedError afe ) {
+			ASSERTION_FAILED_ERROR = afe;
+			fail(expected, actual, messageSupplier);
+		}
+
+		// TODO: Fix comparison of transparent pixels
+		for( int x = 0; x < actualWidth; x++ ) {
+			for( int y = 0; y < actualHeight; y++ ) {
+				try {
+					Assertions.assertTrue(comparePixels(expected.getRGB(x, y), actual.getRGB(x, y)));
+				} catch( AssertionFailedError afe ) {
+					ASSERTION_FAILED_ERROR = afe;
+					fail(expected, actual, messageSupplier);
+				}
+			}
+		}
+	}
+
+	public static void assertNotEquals( BufferedImage expected, BufferedImage actual ) {
+		assertNotEquals(expected, actual, () -> "Actual image is the same as expected buffer.");
+	}
+
+	public static void assertNotEquals( BufferedImage expected, BufferedImage actual, String message ) {
+		assertNotEquals(expected, actual, () -> message);
+	}
+
+	public static void assertNotEquals( BufferedImage expected, BufferedImage actual, Supplier<String> messageSupplier ) {
+		// Compare image dimensions
+		int expectedHeight = expected.getHeight(), expectedWidth = expected.getWidth();
+		int actualHeight = actual.getHeight(), actualWidth = actual.getWidth();
+		if( expectedHeight != actualHeight || expectedWidth != actualWidth ) {
+			// Image dimensions differ, assertion is true
+			return;
+		}
+
+		for( int x = 0; x < actualWidth; x++ ) {
+			for( int y = 0; y < actualHeight; y++ ) {
+				if( !comparePixels(expected.getRGB(x, y), actual.getRGB(x, y)) ) {
+					// Found different pixels, assertion is true
+					return;
+				}
+			}
+		}
+
+		// Images are the same, fail without diff
+		fail(expected, actual, messageSupplier, false);
+	}
+
+	private static void fail( BufferedImage expected, BufferedImage actual, Supplier<String> messageSupplier ) {
+		fail(expected, actual, messageSupplier, SAVE_DIFF_IMAGE_ON_FAIL);
+	}
+
+	private static void fail( BufferedImage expected, BufferedImage actual, Supplier<String> messageSupplier, boolean saveDiffImage ) {
+		if( saveDiffImage ) {
+			saveDiffImage(expected, actual);
+		}
+		throw new AssertionFailedError(
+			messageSupplier != null ? messageSupplier.get() : null,
+			ASSERTION_FAILED_ERROR
+		);
+	}
+
+	private static boolean comparePixels( int a, int b ) {
+		// TODO: Fix comparison of transparent pixels
+		return a == b || ((0xFF000000 & a) == 0 && (0xFF000000 & b) == 0);
+	}
+
+	public static BufferedImage createDiffImage( BufferedImage expected, BufferedImage actual ) {
+		// Error color (white)
+		int errorColor = 0xFF00FF;
+
+		int expectedHeight = expected.getHeight(), expectedWidth = expected.getWidth();
+		int actualHeight = actual.getHeight(), actualWidth = actual.getWidth();
+		int maxHeight = Math.max(expectedHeight, actualHeight), maxWidth = Math.max(expectedWidth, actualWidth);
+
+		BufferedImage diff = ImageLoader.createImage(maxWidth, maxHeight);
+		for( int x = 0; x < maxWidth; x++ ) {
+			for( int y = 0; y < maxHeight; y++ ) {
+				diff.setRGB(x, y, 0);
+				if( x > actualWidth || y > actualHeight || x > expectedWidth || y > expectedHeight ) {
+					// Set overflow pixels to error color
+					diff.setRGB(x, y, errorColor);
+				} else if( !comparePixels(actual.getRGB(x, y), expected.getRGB(x, y)) ) {
+					// Set differences to error color
+					// If both pixels are transparent, the color dows not matter ...
+					// TODO: saturate error color based on how different the colors are?
+					diff.setRGB(x, y, errorColor);
+				}
+			}
+		}
+
+		return diff;
+	}
+
+	public static boolean saveDiffImage( BufferedImage expected, BufferedImage actual ) {
+		BufferedImage diff = createDiffImage(expected, actual);
+		try {
+			File diffFile = new File(DIFF_IMAGE_PATH, makeDiffName());
+			if( !diffFile.getParentFile().exists() ) {
+				diffFile.mkdirs();
+			}
+			ImageLoader.saveImage(diff, diffFile);
+		} catch( IOException ioe ) {
+			// We fail anyways at this point
+			// TODO: Log something?
+			return false;
+		}
+		return true;
+	}
+
+	private static String makeDiffName() {
+		return System.currentTimeMillis() + ".png";
+	}
+
+	private ImageAssertions() {
+	}
+
+}

src/test/java/schule/ngb/zm/util/test/TestEnv.java

@@ -0,0 +1,25 @@
+package schule.ngb.zm.util.test;
+
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.ParameterContext;
+import org.junit.jupiter.api.extension.ParameterResolutionException;
+import org.junit.jupiter.api.extension.ParameterResolver;
+import schule.ngb.zm.Testmaschine;
+import schule.ngb.zm.Zeichenmaschine;
+
+public class TestEnv implements ParameterResolver {
+
+	@Override
+	public boolean supportsParameter( ParameterContext parameterContext, ExtensionContext extensionContext ) throws ParameterResolutionException {
+		return (
+			parameterContext.getParameter().getType() == Zeichenmaschine.class ||
+				parameterContext.getParameter().getType() == Testmaschine.class
+		);
+	}
+
+	@Override
+	public Object resolveParameter( ParameterContext parameterContext, ExtensionContext extensionContext ) throws ParameterResolutionException {
+		return new Testmaschine();
+	}
+
+}