Viele weitere Beispielprojekt für verschiedene Anwendungen

examples/zm_aquarium/Aquarium.java

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+import schule.ngb.zm.Zeichenmaschine;
+import schule.ngb.zm.util.ImageLoader;
+
+public class Aquarium extends Zeichenmaschine {
+
+	public static final int N_FISHES = 25;
+
+	public static void main( String[] args ) {
+		new Aquarium();
+	}
+
+	private Fish[] fish;
+
+	public Aquarium() {
+		super(800, 600, "Aquarium");
+	}
+
+	@Override
+	public void setup() {
+		canvas.addLayer(1, new Background());
+
+		fish = new Fish[N_FISHES];
+
+		for( int i = 1; i <= 7; i++ ) {
+			ImageLoader.preloadImage("fish"+i, "tiles/fish"+i+"gs.png");
+		}
+
+		for( int i = 0; i < N_FISHES; i++ ) {
+			fish[i] = new Fish();
+			shapes.add(fish[i]);
+		}
+	}
+
+	@Override
+	public void update( double delta ) {
+		for( int i = 0; i < fish.length; i++ ) {
+			fish[i].update(delta);
+		}
+	}
+
+	@Override
+	public void draw() {
+
+	}
+
+	@Override
+	public void mouseClicked() {
+		for( int i = 0; i < fish.length; i++ ) {
+			fish[i].randomize();
+		}
+	}
+
+}

examples/zm_aquarium/Background.java

@@ -0,0 +1,59 @@
+
+import schule.ngb.zm.Layer;
+
+import java.awt.Graphics2D;
+import java.awt.Image;
+
+public class Background extends Layer {
+
+	private static final int TILE_SIZE = 64;
+
+	private int tile_width;
+
+	private Image[] floor, plants;
+
+	private Image water;
+
+	public Background() {
+		super();
+	}
+
+	public Background( int width, int height ) {
+		super(width, height);
+	}
+
+	@Override
+	public void setSize( int width, int height ) {
+		super.setSize(width, height);
+		generateBackground();
+	}
+
+	public void generateBackground() {
+		tile_width = (int)(ceil(getWidth()/(double)TILE_SIZE));
+		floor = new Image[tile_width];
+		plants = new Image[tile_width];
+
+		for ( int i = 0; i < tile_width; i++ ) {
+			floor[i] = loadImage("tiles/floor"+random(1,8)+".png");
+			if( random(1,10) < 4 ) {
+				plants[i] = loadImage("tiles/plant"+random(1,14)+".png");
+			}
+		}
+
+		water = loadImage("tiles/water.png");
+
+		for ( int i = 0; i < getHeight(); i += TILE_SIZE ) {
+			for ( int j = 0; j < getWidth(); j += TILE_SIZE ) {
+				drawing.drawImage(water, j, i, null);
+			}
+		}
+
+		for ( int i = 0; i < tile_width; i++ ) {
+			if( plants[i] != null ) {
+				drawing.drawImage(plants[i], i*TILE_SIZE, getHeight() - (2*TILE_SIZE) + 10,TILE_SIZE,TILE_SIZE, null);
+			}
+			drawing.drawImage(floor[i], i*TILE_SIZE, getHeight() - TILE_SIZE,TILE_SIZE,TILE_SIZE, null);
+		}
+	}
+
+}

examples/zm_aquarium/Fish.java

@@ -0,0 +1,72 @@
+import schule.ngb.zm.*;
+import schule.ngb.zm.shapes.Picture;
+import schule.ngb.zm.shapes.Shape;
+
+import java.awt.Graphics2D;
+import java.awt.geom.AffineTransform;
+
+public class Fish extends Shape implements Updatable {
+
+	private int speed;
+
+	private Picture img;
+
+	public Fish() {
+		randomize();
+	}
+
+	public void randomize() {
+		int i = random(1, 7);
+		speed = random(-2, 2);
+		img = new Picture("fish" + i);
+		img.setAnchor(NORTHWEST);
+		img.scale(random(0.8, 1.0));
+		img.tint(randomNiceColor());
+		//img.scale(0.5);
+		if( speed < 0 ) {
+			img.flip(LEFT);
+		}
+		img.moveTo(random(10, width-img.getWidth()), random(30, height-120));
+	}
+
+	@Override
+	public boolean isActive() {
+		return true;
+	}
+
+	@Override
+	public void update( double delta ) {
+		img.move(speed, .5 * sin(tick / (speed * 10.0)));
+
+		if( img.getX() <= 0 || img.getX()+img.getWidth() >= 800 ) {
+			speed *= -1;
+			img.flip(LEFT);
+		}
+	}
+
+	@Override
+	public void draw( Graphics2D graphics, AffineTransform transform ) {
+		img.draw(graphics, transform);
+	}
+
+	@Override
+	public double getWidth() {
+		return img.getWidth();
+	}
+
+	@Override
+	public double getHeight() {
+		return img.getHeight();
+	}
+
+	@Override
+	public Shape copy() {
+		return img.copy();
+	}
+
+	@Override
+	public java.awt.Shape getShape() {
+		return img.getShape();
+	}
+
+}

examples/zm_aquarium/package.bluej

@@ -0,0 +1,55 @@
+#BlueJ package file
+dependency1.from=Attractor
+dependency1.to=Gravity
+dependency1.type=UsesDependency
+dependency2.from=Gravity
+dependency2.to=Mover
+dependency2.type=UsesDependency
+dependency3.from=Gravity
+dependency3.to=Attractor
+dependency3.type=UsesDependency
+editor.fx.0.height=728
+editor.fx.0.width=1037
+editor.fx.0.x=95
+editor.fx.0.y=53
+objectbench.height=94
+objectbench.width=776
+package.divider.horizontal=0.6
+package.divider.vertical=0.8305369127516778
+package.editor.height=488
+package.editor.width=661
+package.editor.x=374
+package.editor.y=158
+package.frame.height=660
+package.frame.width=800
+package.numDependencies=3
+package.numTargets=3
+package.showExtends=true
+package.showUses=true
+project.charset=UTF-8
+readme.height=60
+readme.name=@README
+readme.width=48
+readme.x=10
+readme.y=10
+target1.height=70
+target1.name=Mover
+target1.showInterface=false
+target1.type=ClassTarget
+target1.width=120
+target1.x=380
+target1.y=220
+target2.height=70
+target2.name=Attractor
+target2.showInterface=false
+target2.type=ClassTarget
+target2.width=120
+target2.x=380
+target2.y=350
+target3.height=70
+target3.name=Gravity
+target3.showInterface=false
+target3.type=ClassTarget
+target3.width=120
+target3.x=120
+target3.y=120

examples/zm_boids/Boid.java

@@ -0,0 +1,128 @@
+import schule.ngb.zm.*;
+
+import java.util.List;
+
+public class Boid extends Creature {
+
+	public static final double COHESION_FACTOR = .5;
+
+	public static final double SEPARATION_FACTOR = .5;
+
+	public static final double ALIGNMENT_FACTOR = .5;
+
+	public static final double FLIGHT_FACTOR = .5;
+
+	public static final double VELOCITY_LIMIT = 3.0;
+
+	public static final double FORCE_LIMIT = .1;
+
+	public static final int FLOCK_RADIUS = 100;
+
+	public static final boolean SHOW_RADIUS = false;
+
+	public static final int BOID_WIDTH = 8;
+
+	public static final int BOID_HEIGHT = 16;
+
+	private boolean highlight = false;
+
+	public Boid() {
+		// Generate random Boid
+		super(
+			Vector.random(BOID_WIDTH, width-BOID_WIDTH, BOID_HEIGHT, height-BOID_HEIGHT),
+			Vector.random(-1, 1).scale(random(VELOCITY_LIMIT))
+		);
+		senseRange = FLOCK_RADIUS;
+	}
+
+	public Boid( Vector pos, Vector vel ) {
+		super(pos, vel);
+		senseRange = FLOCK_RADIUS;
+	}
+
+	public void toggleHighlight() {
+		highlight = !highlight;
+	}
+
+	public void draw( DrawingLayer drawing ) {
+		drawing.setFillColor(251, 241, 195);
+		drawing.setStrokeColor(239, 191, 77);
+		drawing.setStrokeWeight(2);
+
+		drawing.pushMatrix();
+		drawing.translate(position.x, position.y);
+		drawing.rotate(90 + velocity.angle());
+		drawing.triangle(BOID_WIDTH / -2.0, BOID_HEIGHT / 2.0, 0, BOID_HEIGHT / -2.0, BOID_WIDTH / 2.0, BOID_HEIGHT / 2.0);
+
+		if( SHOW_RADIUS || highlight ) {
+			drawing.setFillColor(251, 241, 195, 33);
+			drawing.noStroke();
+			drawing.circle(0, 0, FLOCK_RADIUS);
+		}
+		drawing.popMatrix();
+	}
+
+
+	public void update( List<Creature> creatures ) {
+		Vector cohesion = new Vector();
+		Vector separation = new Vector();
+		Vector alignment = new Vector();
+		Vector flight = new Vector();
+		int boids = 0, predators = 0;
+
+		for( Creature c: creatures ) {
+			if( isInRange(c) ) {
+				if( Predator.class.isInstance(c) ) {
+					double distSq = position.distanceSq(c.getPosition());
+					flight.add(Vector.sub(position, c.getPosition()).div(distSq));
+
+					predators += 1;
+				} else {
+					cohesion.add(c.getPosition());
+					alignment.add(c.getVelocity());
+
+					double distSq = position.distanceSq(c.getPosition());
+					separation.add(Vector.sub(position, c.getPosition()).div(distSq));
+
+					boids += 1;
+				}
+			}
+		}
+
+		if( boids > 0 ) {
+			// Cohesion
+			cohesion.div(boids).sub(position);
+			cohesion.setLength(VELOCITY_LIMIT).sub(velocity);
+			cohesion.limit(FORCE_LIMIT);
+			cohesion.scale(COHESION_FACTOR);
+			// Separation
+			separation.div(boids);
+			separation.setLength(VELOCITY_LIMIT).sub(velocity);
+			separation.limit(FORCE_LIMIT);
+			separation.scale(SEPARATION_FACTOR);
+			// Alignment
+			alignment.div(boids);
+			alignment.setLength(VELOCITY_LIMIT).sub(velocity);
+			alignment.limit(FORCE_LIMIT);
+			alignment.scale(ALIGNMENT_FACTOR);
+		}
+		if( predators > 0 ) {
+			flight.div(predators);
+			flight.setLength(VELOCITY_LIMIT).sub(velocity);
+			flight.limit(FORCE_LIMIT*4.0);
+			flight.scale(FLIGHT_FACTOR);
+		}
+
+		acceleration
+			.scale(0.0)
+			.add(separation)
+			.add(cohesion)
+			.add(alignment)
+			.add(flight);
+
+		position.add(velocity);
+		limitPosition();
+		velocity.add(acceleration).limit(VELOCITY_LIMIT);
+	}
+
+}

examples/zm_boids/Boids.java

@@ -0,0 +1,78 @@
+import schule.ngb.zm.*;
+import schule.ngb.zm.util.ImageLoader;
+
+import java.awt.event.KeyEvent;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Boids extends Zeichenmaschine {
+
+	public static void main( String[] args ) {
+		new Boids();
+	}
+
+	public static final boolean BORDER_WRAP = true;
+
+	public static final int N_BOIDS = 200;
+
+	public static final int N_PREDATORS = 0;
+
+	private List<Creature> creatures;
+
+	public Boids() {
+		super(1280, 720, "ZM: Boids");
+	}
+
+	@Override
+	public void setup() {
+		setFullscreen(true);
+		setCursor(ImageLoader.loadImage("pointer.png"), 0, 0);
+
+		creatures = new ArrayList<Creature>();
+
+		synchronized( creatures ) {
+			for( int i = 0; i < N_BOIDS; i++ ) {
+				creatures.add(new Boid());
+			}
+			for( int i = 0; i < N_PREDATORS; i++ ) {
+				creatures.add(new Predator());
+			}
+		}
+	}
+
+	@Override
+	public void update( double delta ) {
+		synchronized( creatures ) {
+			for( Creature c : creatures ) {
+				c.update(creatures);
+			}
+		}
+	}
+
+	@Override
+	public void draw() {
+		drawing.clear(0, 125, 182);
+		synchronized( creatures ) {
+			for( Creature c : creatures ) {
+				c.draw(drawing);
+			}
+		}
+	}
+
+	@Override
+	public void mouseClicked() {
+		synchronized( creatures ) {
+			creatures.add(new Predator(
+				Vector.mouse(), Vector.ZERO
+			));
+		}
+	}
+
+	@Override
+	public void keyPressed() {
+		if( keyCode == KeyEvent.VK_G ) {
+			setSize(800, 800);
+		}
+	}
+
+}

examples/zm_boids/Creature.java

@@ -0,0 +1,77 @@
+import schule.ngb.zm.Constants;
+import schule.ngb.zm.DrawingLayer;
+import schule.ngb.zm.Vector;
+
+import java.util.List;
+
+public abstract class Creature extends Constants {
+
+	protected Vector position, velocity, acceleration;
+
+	protected int senseRange = 100;
+
+	public Creature( Vector pos, Vector vel ) {
+		position = pos.copy();
+		velocity = vel.copy();
+		acceleration = new Vector();
+	}
+
+	public Vector getPosition() {
+		return position;
+	}
+
+	public Vector getVelocity() {
+		return velocity;
+	}
+
+	public abstract void draw( DrawingLayer drawing );
+
+	public abstract void update( List<Creature> creatures );
+
+	protected void limitPosition() {
+		if( position.x < 0 ) {
+			if( Boids.BORDER_WRAP ) {
+				position.x = width;
+			} else {
+				position.x = 0;
+				//velocity.mult(-1);
+				acceleration.add(Vector.scale(velocity, -2));
+			}
+		} else if( position.x > width ) {
+			if( Boids.BORDER_WRAP ) {
+				position.x = 0;
+			} else {
+				position.x = width;
+				//velocity.mult(-1);
+				acceleration.add(Vector.scale(velocity, -2));
+			}
+		}
+		if( position.y < 0 ) {
+			if( Boids.BORDER_WRAP ) {
+				position.y = height;
+			} else {
+				position.y = 0;
+				//velocity.mult(-1);
+				acceleration.add(Vector.scale(velocity, -2));
+			}
+		} else if( position.y > height ) {
+			if( Boids.BORDER_WRAP ) {
+				position.y = 0.0;
+			} else {
+				position.y = height;
+				//velocity.mult(-1);
+				acceleration.add(Vector.scale(velocity, -2));
+			}
+		}
+	}
+
+	protected boolean isInRange( Creature otherCreature ) {
+		if( otherCreature == this || otherCreature == null ) {
+			return false;
+		}
+		if( abs(position.x-otherCreature.getPosition().x) > senseRange  ) {
+			return false;
+		}
+		return position.distanceSq(otherCreature.getPosition()) < senseRange*senseRange;
+	}
+}

examples/zm_boids/Predator.java

@@ -0,0 +1,97 @@
+import schule.ngb.zm.DrawingLayer;
+import schule.ngb.zm.Vector;
+
+import java.util.List;
+
+public class Predator extends Creature {
+
+	public static final int SENSE_RADIUS = 180;
+
+	public static final double AVOIDANCE_FACTOR = .65;
+
+	public static final double HUNTING_FACTOR = .65;
+
+	public static final double VELOCITY_LIMIT = 5.0;
+
+	public static final double FORCE_LIMIT = .1;
+
+	public static final int PREDATOR_WIDTH = 12;
+
+	public static final int PREDATOR_HEIGHT = 26;
+
+	public static final boolean SHOW_RADIUS = true;
+
+	public Predator() {
+		// Generate random Predator
+		super(
+			Vector.random(PREDATOR_WIDTH, width - PREDATOR_WIDTH, PREDATOR_HEIGHT, height - PREDATOR_HEIGHT),
+			Vector.random(-1, 1).scale(random(VELOCITY_LIMIT))
+		);
+		senseRange = SENSE_RADIUS;
+	}
+
+	public Predator( Vector pos, Vector vel ) {
+		super(pos, vel);
+		senseRange = SENSE_RADIUS;
+	}
+
+	public void draw( DrawingLayer drawing ) {
+		drawing.setFillColor(152, 61, 83);
+		drawing.setStrokeColor(225, 33, 32);
+		drawing.setStrokeWeight(2);
+
+		drawing.pushMatrix();
+		drawing.translate(position.x, position.y);
+		drawing.rotate(90 + velocity.angle());
+		drawing.triangle(PREDATOR_WIDTH / -2.0, PREDATOR_HEIGHT / 2.0, 0, PREDATOR_HEIGHT / -2.0, PREDATOR_WIDTH / 2.0, PREDATOR_HEIGHT / 2.0);
+
+		if( SHOW_RADIUS ) {
+			drawing.setFillColor(152, 61, 83, 33);
+			drawing.noStroke();
+			drawing.circle(0, 0, SENSE_RADIUS);
+		}
+		drawing.popMatrix();
+	}
+
+	public void update( List<Creature> creatures ) {
+		Vector hunting = new Vector();
+		Vector separation = new Vector();
+		double boids = 0, predators = 0;
+
+		for( Creature c : creatures ) {
+			if( isInRange(c) ) {
+				if( Boid.class.isInstance(c) ) {
+					hunting.add(c.getPosition());
+					boids += 1;
+				} else {
+					double distSq = position.distanceSq(c.getPosition());
+					separation.add(Vector.sub(position, c.getPosition()).div(distSq));
+
+					predators += 1;
+				}
+			}
+		}
+		if( boids > 0 ) {
+			hunting.div(boids).sub(position);
+			hunting.setLength(VELOCITY_LIMIT).sub(velocity);
+			hunting.limit(FORCE_LIMIT);
+			hunting.scale(HUNTING_FACTOR);
+		}
+		if( predators > 0 ) {
+			separation.div(predators);
+			separation.setLength(VELOCITY_LIMIT).sub(velocity);
+			separation.limit(FORCE_LIMIT);
+			separation.scale(AVOIDANCE_FACTOR);
+		}
+
+		acceleration
+			.scale(0.0)
+			.add(hunting)
+			.add(separation);
+
+		position.add(velocity);
+		limitPosition();
+		velocity.add(acceleration).limit(VELOCITY_LIMIT);
+	}
+
+}

examples/zm_boids/package.bluej

@@ -0,0 +1,55 @@
+#BlueJ package file
+dependency1.from=Attractor
+dependency1.to=Gravity
+dependency1.type=UsesDependency
+dependency2.from=Gravity
+dependency2.to=Mover
+dependency2.type=UsesDependency
+dependency3.from=Gravity
+dependency3.to=Attractor
+dependency3.type=UsesDependency
+editor.fx.0.height=728
+editor.fx.0.width=1037
+editor.fx.0.x=95
+editor.fx.0.y=53
+objectbench.height=94
+objectbench.width=776
+package.divider.horizontal=0.6
+package.divider.vertical=0.8305369127516778
+package.editor.height=488
+package.editor.width=661
+package.editor.x=374
+package.editor.y=158
+package.frame.height=660
+package.frame.width=800
+package.numDependencies=3
+package.numTargets=3
+package.showExtends=true
+package.showUses=true
+project.charset=UTF-8
+readme.height=60
+readme.name=@README
+readme.width=48
+readme.x=10
+readme.y=10
+target1.height=70
+target1.name=Mover
+target1.showInterface=false
+target1.type=ClassTarget
+target1.width=120
+target1.x=380
+target1.y=220
+target2.height=70
+target2.name=Attractor
+target2.showInterface=false
+target2.type=ClassTarget
+target2.width=120
+target2.x=380
+target2.y=350
+target3.height=70
+target3.name=Gravity
+target3.showInterface=false
+target3.type=ClassTarget
+target3.width=120
+target3.x=120
+target3.y=120

examples/zm_cookieclicker/Cookieclicker.java

@@ -0,0 +1,101 @@
+import schule.ngb.zm.GraphicsLayer;
+import schule.ngb.zm.Options;
+import schule.ngb.zm.Zeichenmaschine;
+import schule.ngb.zm.shapes.Picture;
+import schule.ngb.zm.shapes.Text;
+
+import java.util.ArrayList;
+
+public class Cookieclicker extends Zeichenmaschine {
+
+	public static void main( String[] args ) {
+		new Cookieclicker();
+	}
+
+	private int cookies = 0;
+
+	private int cookiesPerClick = 1;
+
+	private int grandmas = 0;
+
+	private int autoclicker = 12, autoclickerTimer = 0, autoClickerDelay = 600;
+
+	private Text tCookies, tShopGrandma, tShopAutoclicker;
+
+	private Picture pCookie;
+
+	private boolean cookieDown = false;
+
+	public Cookieclicker() {
+		super(1280, 900, "Cookieclicker");
+	}
+
+	@Override
+	public void setup() {
+		pCookie = new Picture(width / 2, height / 2, "assets/cookie.png");
+		pCookie.scale(.5);
+		shapes.add(pCookie);
+
+		tCookies = new Text(width - 60, 60, "" + cookies);
+		tCookies.setAnchor(NORTHEAST);
+		tCookies.setStrokeColor(255);
+		tCookies.setFontsize(36);
+		shapes.add(tCookies);
+
+		background.setColor(0);
+	}
+
+	@Override
+	public void update( double delta ) {
+		tCookies.setText("" + cookies);
+
+		autoclickerTimer -= (int)(delta * 1000.0);
+		if( autoclickerTimer <= 0 ) {
+			cookies += autoclicker;
+			autoclickerTimer += autoClickerDelay;
+		}
+
+		synchronized( particles ) {
+			ArrayList<NumberParticle> remove = new ArrayList<>();
+			for( NumberParticle p : particles ) {
+				if( p.isActive() ) {
+					p.update(delta);
+				} else {
+					remove.add(p);
+				}
+			}
+			for( NumberParticle p : remove ) {
+				particles.remove(p);
+			}
+		}
+	}
+
+	@Override
+	public void draw() {
+	}
+
+	ArrayList<NumberParticle> particles = new ArrayList<>();
+
+	@Override
+	public void mousePressed() {
+		if( pCookie.getBounds().contains(mouseX, mouseY) ) {
+			cookieDown = true;
+			cookies += cookiesPerClick;
+			pCookie.scale(.95);
+
+			synchronized( particles ) {
+				NumberParticle p = new NumberParticle(mouseX, mouseY, cookiesPerClick);
+				particles.add(p);
+				shapes.add(p);
+			}
+		}
+	}
+
+	@Override
+	public void mouseReleased() {
+		if( cookieDown ) {
+			pCookie.scale(1 / .95);
+		}
+	}
+
+}

examples/zm_cookieclicker/NumberParticle.java

@@ -0,0 +1,33 @@
+import schule.ngb.zm.Updatable;
+import schule.ngb.zm.shapes.Text;
+
+public class NumberParticle extends Text implements Updatable {
+
+	double sinOffset, life = 0;
+
+	public NumberParticle( double x, double y, int number ) {
+		super(x,y,"+"+number);
+		sinOffset = random(0.0, PI);
+		life = 1.5;
+		setStrokeColor(255);
+		setFontsize(36);
+	}
+
+	@Override
+	public boolean isActive() {
+		return (life > 0);
+	}
+
+	@Override
+	public void update( double delta ) {
+		if( isActive() ) {
+			double deltaX = sin(sinOffset + life);
+			x += deltaX;
+			y -= 100*delta;
+
+			life -= delta;
+			setStrokeColor(strokeColor, (int) interpolate(0, 255, life / 1.5));
+		}
+	}
+
+}

examples/zm_cookieclicker/NumberParticleEmitter.java

@@ -0,0 +1,111 @@
+import schule.ngb.zm.Drawable;
+import schule.ngb.zm.Updatable;
+import schule.ngb.zm.shapes.Text;
+
+import java.awt.Graphics2D;
+import java.util.ArrayList;
+
+public class NumberParticleEmitter implements Updatable, Drawable {
+
+	public class NumberParticle extends Text implements Updatable {
+
+		double velX = 0, velY = 0, accX = 0, accY = 0;
+
+		double life = 0;
+
+		public NumberParticle() {
+			super(0, 0, "0");
+			// life = particleLifespan;
+		}
+
+		@Override
+		public boolean isActive() {
+			return (life <= 0);
+		}
+
+		public void activate() {
+			x = emitterX;
+			y = emitterY;
+			life = particleLifespan;
+		}
+
+		@Override
+		public void update( double delta ) {
+			if( isActive() ) {
+				velX += accX;
+				velY += accY;
+				x += velX;
+				y += velY;
+
+				life -= delta;
+				setFillColor(fillColor, (int) interpolate(0, 255, life / particleLifespan));
+			}
+		}
+
+	}
+
+	private int particlesPerSecond, maxParticles;
+
+	private double particleLifespan;
+
+	private ArrayList<NumberParticle> particles;
+
+	private int activeParticles = 0;
+
+	private double lastEmit = 0.0;
+
+	private double emitterX, emitterY;
+
+	public NumberParticleEmitter( double x, double y, int particlesPerSecond, double particleLifespan ) {
+		emitterX = x;
+		emitterY = y;
+
+		this.particlesPerSecond = particlesPerSecond;
+		this.particleLifespan = particleLifespan;
+
+		maxParticles = (int) Math.ceil(particlesPerSecond * particleLifespan);
+		particles = new ArrayList<>(maxParticles);
+
+		for( int i = 0; i < maxParticles; i++ ) {
+			particles.add(new NumberParticle());
+		}
+	}
+
+	@Override
+	public boolean isVisible() {
+		return activeParticles > 0;
+	}
+
+	@Override
+	public void draw( Graphics2D graphics ) {
+		for( NumberParticle p : particles ) {
+			if( p.isActive() ) {
+				p.draw(graphics);
+			}
+		}
+	}
+
+	@Override
+	public boolean isActive() {
+		return isVisible();
+	}
+
+	public void emitParticle( int number ) {
+		particles.add(new NumberParticle());
+	}
+
+	@Override
+	public void update( double delta ) {
+		//lastEmit -= delta;
+
+		for( NumberParticle p : particles ) {
+			if( p.isActive() ) {
+				p.update(delta);
+			} /*else if( lastEmit <= 0 ) {
+				p.activate();
+				lastEmit += 1/(double)particlesPerSecond;
+			}*/
+		}
+	}
+
+}

examples/zm_cookieclicker/ParticleTest.java

@@ -0,0 +1,36 @@
+import schule.ngb.zm.GraphicsLayer;
+import schule.ngb.zm.Zeichenmaschine;
+
+public class ParticleTest extends Zeichenmaschine {
+
+	public static void main( String[] args ) {
+		new ParticleTest();
+	}
+
+	private NumberParticleEmitter emitter;
+
+	private GraphicsLayer graphics;
+
+	public ParticleTest() {
+		super(800,800, "Particles");
+	}
+
+	@Override
+	public void setup() {
+		graphics = new GraphicsLayer();
+		canvas.addLayer(graphics);
+
+		emitter = new NumberParticleEmitter(400, 400, 1, 10);
+	}
+
+	@Override
+	public void update( double delta ) {
+		emitter.update(delta);
+	}
+
+	@Override
+	public void draw() {
+		emitter.draw(graphics.getGraphics());
+	}
+
+}

examples/zm_cookieclicker/package.bluej

@@ -0,0 +1,55 @@
+#BlueJ package file
+dependency1.from=Attractor
+dependency1.to=Gravity
+dependency1.type=UsesDependency
+dependency2.from=Gravity
+dependency2.to=Mover
+dependency2.type=UsesDependency
+dependency3.from=Gravity
+dependency3.to=Attractor
+dependency3.type=UsesDependency
+editor.fx.0.height=728
+editor.fx.0.width=1037
+editor.fx.0.x=95
+editor.fx.0.y=53
+objectbench.height=94
+objectbench.width=776
+package.divider.horizontal=0.6
+package.divider.vertical=0.8305369127516778
+package.editor.height=488
+package.editor.width=661
+package.editor.x=374
+package.editor.y=158
+package.frame.height=660
+package.frame.width=800
+package.numDependencies=3
+package.numTargets=3
+package.showExtends=true
+package.showUses=true
+project.charset=UTF-8
+readme.height=60
+readme.name=@README
+readme.width=48
+readme.x=10
+readme.y=10
+target1.height=70
+target1.name=Mover
+target1.showInterface=false
+target1.type=ClassTarget
+target1.width=120
+target1.x=380
+target1.y=220
+target2.height=70
+target2.name=Attractor
+target2.showInterface=false
+target2.type=ClassTarget
+target2.width=120
+target2.x=380
+target2.y=350
+target3.height=70
+target3.name=Gravity
+target3.showInterface=false
+target3.type=ClassTarget
+target3.width=120
+target3.x=120
+target3.y=120

examples/zm_follow/Eye.java

@@ -0,0 +1,51 @@
+import schule.ngb.zm.Color;
+import schule.ngb.zm.DrawingLayer;
+import schule.ngb.zm.Vector;
+import schule.ngb.zm.Zeichenobjekt;
+
+public class Eye extends Zeichenobjekt {
+
+	private Vector position;
+
+	private double size;
+
+	private Color color;
+
+	public Eye() {
+		position = Vector.random(0, width, 0, height);
+		size = random(10.0, 25.0);
+		color = null;
+	}
+
+	public Eye( float x, float y ) {
+		position = new Vector(x, y);
+		size = random(10.0, 25.0);
+		color = null;
+	}
+
+	public Eye( float x, float y, Color color ) {
+		position = new Vector(x, y);
+		size = random(10.0, 25.0);
+		this.color = color;
+	}
+
+	@Override
+	public void draw( DrawingLayer drawing ) {
+		Vector dir = Vector.sub(new Vector(mouseX, mouseY), position);
+		double len = dir.length();
+
+		drawing.setStrokeColor(0);
+		if( color == null ) {
+			drawing.setFillColor(colorHsb(354, 100.0 - limit(len, 0.0, 100.0), 100));
+		} else {
+			drawing.setFillColor(color);
+		}
+		drawing.circle(position.x, position.y, size);
+
+
+		Vector pupil = Vector.add(position, dir.limit(size*.4));
+
+		drawing.setFillColor(0);
+		drawing.circle(pupil.x, pupil.y, size*.4);
+	}
+}

examples/zm_follow/Eyes.java

@@ -0,0 +1,38 @@
+import schule.ngb.zm.Zeichenmaschine;
+
+public class Eyes extends Zeichenmaschine {
+
+	public static final int N_EYES = 30;
+
+	public static void main( String[] args ) {
+		new Eyes();
+	}
+
+	Eye[] eyes;
+
+	public Eyes() {
+		super(600, 600, "Eyes");
+	}
+
+	@Override
+	public void setup() {
+		eyes = new Eye[N_EYES];
+		for( int i = 0; i < eyes.length; i++ ) {
+			eyes[i] = new Eye();
+		}
+	}
+
+	@Override
+	public void update( double delta ) {
+
+	}
+
+	@Override
+	public void draw() {
+		drawing.clear(200);
+
+		for( int i = 0; i < eyes.length; i++ ) {
+			eyes[i].draw(drawing);
+		}
+	}
+}

examples/zm_follow/package.bluej

@@ -0,0 +1,55 @@
+#BlueJ package file
+dependency1.from=Attractor
+dependency1.to=Gravity
+dependency1.type=UsesDependency
+dependency2.from=Gravity
+dependency2.to=Mover
+dependency2.type=UsesDependency
+dependency3.from=Gravity
+dependency3.to=Attractor
+dependency3.type=UsesDependency
+editor.fx.0.height=728
+editor.fx.0.width=1037
+editor.fx.0.x=95
+editor.fx.0.y=53
+objectbench.height=94
+objectbench.width=776
+package.divider.horizontal=0.6
+package.divider.vertical=0.8305369127516778
+package.editor.height=488
+package.editor.width=661
+package.editor.x=374
+package.editor.y=158
+package.frame.height=660
+package.frame.width=800
+package.numDependencies=3
+package.numTargets=3
+package.showExtends=true
+package.showUses=true
+project.charset=UTF-8
+readme.height=60
+readme.name=@README
+readme.width=48
+readme.x=10
+readme.y=10
+target1.height=70
+target1.name=Mover
+target1.showInterface=false
+target1.type=ClassTarget
+target1.width=120
+target1.x=380
+target1.y=220
+target2.height=70
+target2.name=Attractor
+target2.showInterface=false
+target2.type=ClassTarget
+target2.width=120
+target2.x=380
+target2.y=350
+target3.height=70
+target3.name=Gravity
+target3.showInterface=false
+target3.type=ClassTarget
+target3.width=120
+target3.x=120
+target3.y=120

examples/zm_forces/Attractor.java

@@ -75,8 +75,8 @@ public class Attractor extends Mover {
 		if( pMover != this && isActive() ) {
 			Vector force = new Vector(this.x, this.y);
 			force.sub(pMover.getX(), pMover.getY());
-			double v = G * mass / force.lenSq();
+			double v = G * mass / force.lengthSq();
-			force.setLen(v).limit(1.0, 4 * G);
+			force.setLength(v).limit(1.0, 4 * G);
 			pMover.applyForce(force);
 		}
 	}

examples/zm_forces/Gravity.java

@@ -77,10 +77,11 @@ public class Gravity extends Zeichenmaschine {
 	 * Welt zurück.
 	 */
 	public void mouseClicked() {
+		background.setColor(randomNiceColor());
 		for( Mover m : movers ) {
 			m.moveTo(random(10, width - 10), 30);
 			m.setVelocity(mouseX-m.getX(), mouseY-m.getY());
-			m.getVelocity().setLen(4.0);
+			m.getVelocity().setLength(4.0);
 		}
 	}
 

examples/zm_forces/Mover.java

@@ -23,7 +23,7 @@ public class Mover extends Circle implements Updatable {
 	/**
 	 * Ob die momentane Geschwindigkeit der Objekte als Pfeil dargestellt werden soll.
 	 */
-	public static final boolean SHOW_VELOCITY = false;
+	public static final boolean SHOW_VELOCITY = true;
 
 
 	/**
@@ -163,9 +163,11 @@ public class Mover extends Circle implements Updatable {
 		velocity.add(acceleration);
 		acceleration.scale(0.0);
 
+		if( velocity.length() > 0.5 ) {
 			this.x += velocity.x;
 			this.y += velocity.y;
 		}
+	}
 
 	@Override
 	public void draw( Graphics2D graphics, AffineTransform transform ) {

examples/zm_formen/Dreieck.java

@@ -0,0 +1,33 @@
+
+/**
+ * Beschreiben Sie hier die Klasse Dreieck.
+ * 
+ * @author (Ihr Name) 
+ * @version (eine Versionsnummer oder ein Datum)
+ */
+public class Dreieck
+{
+    // Instanzvariablen - ersetzen Sie das folgende Beispiel mit Ihren Variablen
+    private int x;
+
+    /**
+     * Konstruktor für Objekte der Klasse Dreieck
+     */
+    public Dreieck()
+    {
+        // Instanzvariable initialisieren
+        x = 0;
+    }
+
+    /**
+     * Ein Beispiel einer Methode - ersetzen Sie diesen Kommentar mit Ihrem eigenen
+     * 
+     * @param  y    ein Beispielparameter für eine Methode
+     * @return        die Summe aus x und y
+     */
+    public int beispielMethode(int y)
+    {
+        // tragen Sie hier den Code ein
+        return x + y;
+    }
+}

examples/zm_formen/Kreis.java

@@ -0,0 +1,88 @@
+import schule.ngb.zm.Color;
+import schule.ngb.zm.Drawable;
+
+import java.awt.Graphics2D;
+
+public class Kreis implements Drawable {
+
+    private int x;
+
+    private int y;
+
+    private int radius;
+
+    private Color farbe;
+
+    private Color linienfarbe;
+
+    private boolean sichtbar;
+
+    public Kreis() {
+        x = 420;
+        y = 420;
+
+        radius = 80;
+
+        farbe = Color.BLUE;
+        linienfarbe = Color.BLACK;
+
+        sichtbar = true;
+    }
+
+    public void anzeigen() {
+        sichtbar = true;
+    }
+
+    public void verstecken() {
+        sichtbar = false;
+    }
+
+    public void setPosition( int pX, int pY ) {
+        x = pX;
+        y = pY;
+    }
+
+    public void links() {
+        x -= 10;
+    }
+
+    public void rechts() {
+        x += 10;
+    }
+
+    public void hoch() {
+        y -= 10;
+    }
+
+    public void runter() {
+        y += 10;
+    }
+
+    public void setRadius( int pRadius ) {
+        radius = pRadius;
+    }
+
+    public void setFarbe( String pFarbe ) {
+        farbe = Color.parseString(pFarbe);
+    }
+
+    public void setLinienfarbe( String pLinienfarbe ) {
+        linienfarbe = Color.parseString(pLinienfarbe);
+    }
+
+    @Override
+    public boolean isVisible() {
+        return sichtbar;
+    }
+
+    @Override
+    public void draw( Graphics2D graphics ) {
+        if( x-(radius/2.0) > 0 && x+(radius/2.0) < 800 && y-(radius/2.0) > 0 && y+(radius/2.0) < 800 ) {
+            graphics.setColor(farbe.getJavaColor());
+            graphics.fillOval(x, y, radius, radius);
+            graphics.setColor(linienfarbe.getJavaColor());
+            graphics.drawOval(x, y, radius, radius);
+        }
+    }
+
+}

examples/zm_formen/Leinwand.java

@@ -0,0 +1,29 @@
+import schule.ngb.zm.Drawable;
+import schule.ngb.zm.DrawableLayer;
+import schule.ngb.zm.Zeichenmaschine;
+
+public class Leinwand {
+
+	private final Zeichenmaschine zm;
+
+    private final DrawableLayer zeichenflaeche;
+
+    public Leinwand() {
+		zm = new Zeichenmaschine(800, 800, "ZM: Shapes", false);
+        zeichenflaeche = new DrawableLayer();
+        zm.addLayer(zeichenflaeche);
+    }
+
+    public void anzeigen( Drawable pForm ) {
+        zeichenflaeche.add(pForm);
+    }
+
+	public void beenden() {
+		zm.exit();
+	}
+
+	public void zeichnen() {
+		zm.redraw();
+	}
+
+}

examples/zm_formen/Rechteck.java

@@ -0,0 +1,95 @@
+import schule.ngb.zm.Color;
+import schule.ngb.zm.Drawable;
+
+import java.awt.Graphics2D;
+
+public class Rechteck implements Drawable {
+
+    private int x;
+
+    private int y;
+
+    private int breite;
+
+    private int hoehe;
+
+    private Color farbe;
+
+    private Color linienfarbe;
+
+    private boolean sichtbar;
+
+    public Rechteck() {
+        x = 320;
+        y = 240;
+
+        breite = 100;
+        hoehe = 60;
+
+        farbe = Color.RED;
+        linienfarbe = Color.BLACK;
+
+        sichtbar = true;
+    }
+
+	public void anzeigen() {
+		sichtbar = true;
+	}
+
+	public void verstecken() {
+		sichtbar = false;
+	}
+
+	public void setPosition( int pX, int pY ) {
+		x = pX;
+		y = pY;
+	}
+
+	public void links() {
+		x -= 10;
+	}
+
+	public void rechts() {
+		x += 10;
+	}
+
+	public void hoch() {
+		y -= 10;
+	}
+
+	public void runter() {
+		y += 10;
+	}
+
+	public void setBreite( int pBreite ) {
+		breite = pBreite;
+	}
+
+	public void setHoehe( int pHoehe ) {
+		hoehe = pHoehe;
+	}
+
+	public void setFarbe( String pFarbe ) {
+		farbe = Color.parseString(pFarbe);
+	}
+
+	public void setLinienfarbe( String pLinienfarbe ) {
+		linienfarbe = Color.parseString(pLinienfarbe);
+	}
+
+	@Override
+	public boolean isVisible() {
+		return sichtbar;
+	}
+
+	@Override
+	public void draw( Graphics2D graphics ) {
+		if( x-(breite/2.0) > 0 && x+(breite/2.0) < 800 && y-(hoehe/2.0) > 0 && y+(hoehe/2.0) < 800 ) {
+			graphics.setColor(farbe.getJavaColor());
+			graphics.fillRect(x, y, breite, hoehe);
+			graphics.setColor(linienfarbe.getJavaColor());
+			graphics.drawRect(x, y, breite, hoehe);
+		}
+	}
+
+}

examples/zm_formen/package.bluej

@@ -0,0 +1,53 @@
+#BlueJ package file
+editor.fx.0.height=728
+editor.fx.0.width=800
+editor.fx.0.x=488
+editor.fx.0.y=107
+objectbench.height=94
+objectbench.width=776
+package.divider.horizontal=0.6
+package.divider.vertical=0.8305369127516778
+package.editor.height=488
+package.editor.width=661
+package.editor.x=36
+package.editor.y=155
+package.frame.height=660
+package.frame.width=800
+package.numDependencies=0
+package.numTargets=4
+package.showExtends=true
+package.showUses=true
+project.charset=UTF-8
+readme.height=60
+readme.name=@README
+readme.width=48
+readme.x=10
+readme.y=10
+target1.height=30
+target1.name=Rechteck
+target1.showInterface=false
+target1.type=ClassTarget
+target1.width=70
+target1.x=190
+target1.y=50
+target2.height=30
+target2.name=Dreieck
+target2.showInterface=false
+target2.type=ClassTarget
+target2.width=70
+target2.x=190
+target2.y=170
+target3.height=30
+target3.name=Kreis
+target3.showInterface=false
+target3.type=ClassTarget
+target3.width=70
+target3.x=190
+target3.y=110
+target4.height=60
+target4.name=Leinwand
+target4.showInterface=false
+target4.type=ClassTarget
+target4.width=120
+target4.x=40
+target4.y=100

examples/zm_gallery/Gallery.java

@@ -1,8 +1,6 @@
 import schule.ngb.zm.Color;
 import schule.ngb.zm.Zeichenmaschine;
 
-import java.awt.event.KeyEvent;
-
 /**
  * Eine Bildergallerie von Bildern eines Informatikkurses des 10. Jahrgangs.
  */
@@ -45,7 +43,7 @@ public class Gallery extends Zeichenmaschine {
 	}
 
 	/**
-	 * Bei Betätigen der Leertaste ein Zufallsbild anzeigen
+	 * Bei Betätigen der Leertaste ein Zufallsbild anzeigen.
 	 */
 	public void keyPressed() {
 		if (keyCode == 32) {
@@ -133,7 +131,6 @@ public class Gallery extends Zeichenmaschine {
 		double size = height * 0.06666;
 		double borderX = width / 6.0, borderY = height / 6.0;
 
-
 		// Flaggenstab zeichnen
 		drawing.setFillColor(BROWN);
 		drawing.rect(borderX, borderY, size, height - 2 * borderY, NORTHWEST);
@@ -165,7 +162,7 @@ public class Gallery extends Zeichenmaschine {
 
 		// Einige Werte berechnen, die später verwendet werden, um
 		// die Zeichnung an die Bildschirmgröße anzupassen.
-		double radius = limit(width*0.6666, height*0.6666) / 2.0;
+		double radius = limit(width * 0.6666, 0.0, height * 0.6666) / 2.0;
 		double w2 = width / 2.0, h2 = height / 2.0;
 		double r2 = radius / 2.0,
 				r3 = radius / 3.0, r4 = radius / 4.0,
@@ -195,8 +192,7 @@ public class Gallery extends Zeichenmaschine {
 					w2 + r2 - r4 * cos(radians(360 / beams * i)),
 					h2 - r3 + r4 * sin(radians(360 / beams * i)),
 					w2 + r2 + 2 + r5,
-				h2 - r3 - 2 - r5
+					h2 - r3 - 2 - r5);
-			);
 
 			drawing.setStrokeType(DASHED);
 			drawing.setStrokeWeight(3.0);
@@ -204,8 +200,7 @@ public class Gallery extends Zeichenmaschine {
 					w2 + r2 - r4 * cos(radians(360 / beams * i)),
 					h2 - r3 + r4 * sin(radians(360 / beams * i)),
 					w2 + r2 + 2 + r5,
-				h2 - r3 - 2 - r5
+					h2 - r3 - 2 - r5);
-			);
 
 			drawing.setStrokeColor(WHITE);
 			drawing.setStrokeType(SOLID);
@@ -214,8 +209,7 @@ public class Gallery extends Zeichenmaschine {
 					w2 + r2 - r4 * cos(radians(360 / beams * i)),
 					h2 - r3 + r4 * sin(radians(360 / beams * i)),
 					w2 + r2 + 2 + r5,
-				h2 - r3 - 2 - r5
+					h2 - r3 - 2 - r5);
-			);
 		}
 
 		// Hauptstrahl

examples/zm_generative/BouncingLine.java

@@ -0,0 +1,77 @@
+import schule.ngb.zm.Vector;
+import schule.ngb.zm.Zeichenmaschine;
+
+public class BouncingLine extends Zeichenmaschine {
+
+	public static void main( String[] args ) {
+		new BouncingLine();
+	}
+
+	private Vector start, end, dStart, dEnd;
+
+	private int r, g, b;
+
+	private boolean mouseFollow = false;
+
+	public BouncingLine() {
+		super(800, 800, "Bouncing Lines");
+	}
+
+	@Override
+	public void setup() {
+		start = Vector.random(0, width, 0, height);
+		end = Vector.random(0, width, 0, height);
+		dStart = Vector.random(-5, 5);
+		dEnd = Vector.random(-5, 5);
+
+		r = random(255);
+		g = random(255);
+		b = random(255);
+	}
+
+	@Override
+	public void update( double delta ) {
+		start.add(dStart);
+		end.add(dEnd);
+
+		if( start.x > width || start.x < 0 ) {
+			dStart.x *= -1;
+		}
+		if( end.x > width || end.x < 0 ) {
+			dEnd.x *= -1;
+		}
+		if( start.y > width || start.y < 0 ) {
+			dStart.y *= -1;
+		}
+		if( end.y > width || end.y < 0 ) {
+			dEnd.y *= -1;
+		}
+
+		r += limit(random(-5, 5), 0, 255);
+		g += limit(random(-5, 5), 0, 255);
+		b += limit(random(-5, 5), 0, 255);
+	}
+
+	@Override
+	public void draw() {
+		drawing.setStrokeColor(r, g, b);
+		drawing.line(start.x, start.y, end.x, end.y);
+		// bezier(0, 0, startX, startY, endX, endY, width, height);
+	}
+
+	@Override
+	public void mouseClicked() {
+		mouseFollow = !mouseFollow;
+	}
+
+	@Override
+	public void mouseMoved() {
+		if( mouseFollow ) {
+			dStart = new Vector(mouseX - start.x, mouseY - start.y);
+			dStart.setLength(5);
+			dEnd = new Vector(mouseX - end.x, mouseY - end.y);
+			dEnd.setLength(5);
+		}
+	}
+
+}

examples/zm_generative/GenColors.java

@@ -0,0 +1,40 @@
+import schule.ngb.zm.Color;
+import schule.ngb.zm.Zeichenmaschine;
+
+public class GenColors extends Zeichenmaschine {
+
+	public static void main( String[] args ) {
+		new GenColors();
+	}
+
+	public GenColors() {
+		super(800, 800, "Nice Colors");
+	}
+
+	@Override
+	public void setup() {
+		genPattern();
+	}
+
+	public void genPattern() {
+		drawing.noStroke();
+
+		int SIZE = 40;
+		for( int i = 0; i < width/SIZE; i++ ) {
+			for( int j = 0; j < height/SIZE; j++ ) {
+				Color c = randomNiceColor();
+				float[] hsl = Color.RGBtoHSL(c.getRGBA(), null);
+				System.out.printf("%f, %f, %f\n", hsl[0], hsl[1], hsl[2]);
+				drawing.setFillColor(c);
+				drawing.square(i*SIZE, j*SIZE, SIZE, NORTHWEST);
+			}
+		}
+	}
+
+	@Override
+	public void mouseClicked() {
+		genPattern();
+		redraw();
+	}
+
+}

examples/zm_generative/GenHitomezashi.java

@@ -0,0 +1,122 @@
+import schule.ngb.zm.Color;
+import schule.ngb.zm.Constants;
+import schule.ngb.zm.Options;
+import schule.ngb.zm.Zeichenmaschine;
+
+public class GenHitomezashi extends Zeichenmaschine {
+
+	public static final int TILE_SIZE = 20;
+
+	public static final int COLUMNS = 30;
+
+	public static final int ROWS = 30;
+
+	public static final double P = 0.5;
+
+	public static final Color[] colors = new Color[]{
+		randomNiceColor(),
+		randomNiceColor(),
+		color(241, 124, 55),
+		color(62, 156, 191)
+	};
+
+	private int[] stitchesX, stitchesY;
+
+	public static void main( String[] args ) {
+		new GenHitomezashi();
+	}
+
+
+	public GenHitomezashi() {
+		super(TILE_SIZE*COLUMNS, TILE_SIZE*ROWS, "Hitomezashi Pattern");
+	}
+
+	@Override
+	public void setup() {
+		drawing.setStrokeColor(0);
+		drawing.setFillColor(0);
+
+		generatePattern();
+
+		pause();
+	}
+
+	public void generatePattern() {
+		stitchesX = new int[COLUMNS];
+		for ( int i = 0; i < COLUMNS; i++ ) {
+			stitchesX[i] = random(0, 1) < P ? 1 : 0;
+		}
+		stitchesY = new int[COLUMNS];
+		for ( int j = 0; j < ROWS; j++ ) {
+			stitchesY[j] = random(0, 1) < P ? 1 : 0;
+		}
+	}
+
+	public boolean hasStitch( int i, int j, Options.Direction dir ) {
+		switch( dir ) {
+			case UP:
+				return (j > 0 && (stitchesY[j-1]+i)%2 == 1);
+			case DOWN:
+				return (j >= 0 && (stitchesY[j]+i)%2 == 1);
+			case LEFT:
+				return (i > 0 && (stitchesX[i-1]+j)%2 == 1);
+			case RIGHT:
+				return (i >= 0 && (stitchesX[i]+j)%2 == 1);
+			default:
+				return false;
+		}
+	}
+
+	@Override
+	public void update( double delta ) {
+
+	}
+
+	@Override
+	public void draw() {
+		drawing.clear(200);
+
+		int clr = random(1), clr2 = clr;
+		drawing.noStroke();
+		for ( int i = 0; i < COLUMNS; i++ ) {
+			if ( hasStitch(i, 0, LEFT) ) {
+				clr = (clr2+1)%2;
+				clr2 = clr;
+			} else {
+				clr = clr2;
+			}
+
+			for ( int j = 0; j < ROWS; j++ ) {
+				drawing.setFillColor(colors[clr]);
+				drawing.rect(i*TILE_SIZE, j*TILE_SIZE, TILE_SIZE, TILE_SIZE, NORTHWEST);
+
+				if ( hasStitch(i, j, DOWN) ) {
+					clr = (clr+1)%2;
+				}
+			}
+		}
+
+		drawing.setStrokeColor(0);
+		drawing.setStrokeWeight(2);
+		for ( int i = 0; i < COLUMNS; i++ ) {
+			for ( int j = 0; j < ROWS; j++ ) {
+				boolean stitchX = (stitchesX[i]+j)%2 == 1;
+				if ( i < COLUMNS-1 && stitchX ) {
+					drawing.line((i+1)*TILE_SIZE, j*TILE_SIZE, (i+1)*TILE_SIZE, (j+1)*TILE_SIZE);
+				}
+
+				boolean stitchY = (stitchesY[j]+i)%2 == 1;
+				if ( j < ROWS-1 && stitchY ) {
+					drawing.line(i*TILE_SIZE, (j+1)*TILE_SIZE, (i+1)*TILE_SIZE, (j+1)*TILE_SIZE);
+				}
+			}
+		}
+	}
+
+	@Override
+	public void mousePressed() {
+		generatePattern();
+		redraw();
+	}
+
+}

examples/zm_generative/GenLines.java

@@ -0,0 +1,62 @@
+import schule.ngb.zm.Color;
+import schule.ngb.zm.Zeichenmaschine;
+
+public class GenLines extends Zeichenmaschine {
+
+	public static final int BORDER = 16;
+
+	public static final int SIZE = 400;
+
+	public static Color[] colors = new Color[]{
+		color(62, 156, 191),
+		color(167, 236, 242),
+		color(242, 196, 61),
+		color(241, 124, 55),
+		color(242, 109, 80)
+	};
+
+
+	public static void main( String[] args ) {
+		new GenLines();
+	}
+
+
+	private int i = 0;
+
+	public GenLines() {
+		super(SIZE, SIZE, "Lines");
+	}
+
+	@Override
+	public void setup() {
+		setFramesPerSecond(10);
+		drawing.clear(33);
+	}
+
+	@Override
+	public void update( double delta ) {
+	}
+
+	@Override
+	public void draw() {
+		int a = random(BORDER, SIZE-BORDER);
+
+		//drawing.setStrokeColor(random(50, 200));
+		drawing.setStrokeColor(colors[random(colors.length-1)]);
+		drawing.setStrokeWeight(random(4,12));
+
+		int d;
+		if( a > SIZE*0.5 ) {
+			d = random(1, (SIZE - a) - BORDER);
+		} else {
+			d = random(1, a - BORDER);
+		}
+		drawing.line(a - d, a + d, a + d, a - d);
+
+		i += 1;
+		if( i == SIZE ) {
+			stop();
+		}
+	}
+
+}

examples/zm_generative/GenSpiral.java

@@ -0,0 +1,60 @@
+import schule.ngb.zm.Color;
+import schule.ngb.zm.Zeichenmaschine;
+
+public class GenSpiral extends Zeichenmaschine {
+
+	public static final int SIZE = 800;
+
+	public static final double D_SCALE = .33;
+	public static final double A_SCALE = 6.0;
+
+	public static Color[] colors = new Color[]{
+		color(62, 156, 191, 44),
+		color(167, 236, 242, 44),
+		color(242, 196, 61, 44),
+		color(241, 124, 55, 44),
+		color(242, 109, 80, 44)
+	};
+
+	public static void main( String[] args ) {
+		new GenSpiral();
+	}
+
+
+	private int i = 0;
+
+	public GenSpiral() {
+		super(SIZE, SIZE, "Lines");
+	}
+
+	@Override
+	public void setup() {
+		setFramesPerSecond(60);
+		drawing.clear(33);
+		drawing.translate(SIZE/2, SIZE/2);
+	}
+
+	@Override
+	public void update( double delta ) {
+	}
+
+	@Override
+	public void draw() {
+		double d = (tick * D_SCALE); // + random(0,3);
+		double a = radians(tick * tick / A_SCALE);
+		// a = radians(tick * A_SCALE / D_SCALE);
+		// a = radians(d * A_SCALE);
+
+		int x = (int)(d * cos(a));
+		int y = (int)(d * sin(a));
+
+		drawing.setFillColor(colors[random(colors.length - 1)]);
+		drawing.noStroke();
+		drawing.circle(x, y, 10);
+
+		if( d > SIZE+SIZE ) {
+			stop();
+		}
+	}
+
+}

examples/zm_generative/GenWalk.java

@@ -0,0 +1,43 @@
+import schule.ngb.zm.DrawingLayer;
+import schule.ngb.zm.Zeichenmaschine;
+
+public class GenWalk extends Zeichenmaschine {
+
+	public static final int N_WALKERS = 8;
+
+	private Walker[] walkers;
+
+	public static void main( String[] args ) {
+		new GenWalk();
+	}
+
+	public GenWalk() {
+		super(800, 800, "Randomwalk");
+	}
+
+	@Override
+	public void setup() {
+		this.walkers = new Walker[N_WALKERS];
+		for( int i = 0; i < walkers.length; i++ ) {
+			this.walkers[i] = new Walker(width/2, height/2, drawing);
+		}
+
+		drawing.clear(0);
+	}
+
+	@Override
+	public void update( double delta ) {
+		for( Walker walker: walkers ) {
+			walker.update();
+		}
+	}
+
+	@Override
+	public void draw() {
+		drawing.clear(0, 5);
+		for( Walker walker: walkers ) {
+			walker.draw();
+		}
+	}
+
+}

examples/zm_generative/README.TXT

@@ -0,0 +1,12 @@
+# Zeichenmaschine: GenLines
+
+GenLines ist ein kreatives Projekt, bei dem ein Feld von Punkten durch geschickt
+gewählte mathematische Formeln animiert wird.
+
+Die Idee stammt von der Seite http://tixy.land
+
+Dort finden sich auch weitere Beispiele für interessante Animationen.
+
+## Verwendung
+
+

examples/zm_generative/Walker.java

@@ -0,0 +1,50 @@
+import schule.ngb.zm.*;
+
+// TODO: Build Interface (like Drawable) that uses DrawingLayer instead of Graphics2D ?
+
+public class Walker extends Constants {
+
+	public static final int SIZE = 8;
+
+	public static final int STEP = 6;
+
+	private static final Color[] colors = new Color[]{
+		Color.parseHexcode("#b13254"),
+		Color.parseHexcode("#ff5349"),
+		Color.parseHexcode("#ff7249"),
+		Color.parseHexcode("#ff9248")
+	};
+
+	private int x;
+
+	private int y;
+
+	private Color color;
+
+	private DrawingLayer drawing;
+
+	public Walker(DrawingLayer drawing) {
+		this(0, 0, drawing);
+	}
+
+	public Walker( int x, int y, DrawingLayer drawing) {
+		this.x = x;
+		this.y = y;
+		this.color = choice(colors);
+		this.drawing = drawing;
+	}
+
+	public void update() {
+		x += random(-STEP, STEP);
+		y += random(-STEP, STEP);
+		x = limit(x, 10, drawing.getWidth() - 10);
+		y = limit(y, 10, drawing.getHeight() - 10);
+	}
+
+	public void draw() {
+		drawing.setFillColor(color);
+		drawing.noStroke();
+		drawing.square(x, y, SIZE, MIDDLE);
+	}
+
+}

examples/zm_generative/package.bluej

@@ -0,0 +1,58 @@
+#BlueJ package file
+dependency1.from=GenLines
+dependency1.to=MyTIXY
+dependency1.type=UsesDependency
+dependency2.from=GenLines
+dependency2.to=Dot
+dependency2.type=UsesDependency
+dependency3.from=MyTIXY
+dependency3.to=Dot
+dependency3.type=UsesDependency
+dependency4.from=Dot
+dependency4.to=GenLines
+dependency4.type=UsesDependency
+editor.fx.0.height=728
+editor.fx.0.width=1037
+editor.fx.0.x=95
+editor.fx.0.y=53
+objectbench.height=94
+objectbench.width=776
+package.divider.horizontal=0.6
+package.divider.vertical=0.8305369127516778
+package.editor.height=488
+package.editor.width=661
+package.editor.x=374
+package.editor.y=158
+package.frame.height=660
+package.frame.width=800
+package.numDependencies=4
+package.numTargets=3
+package.showExtends=true
+package.showUses=true
+project.charset=UTF-8
+readme.height=60
+readme.name=@README
+readme.width=48
+readme.x=10
+readme.y=10
+target1.height=70
+target1.name=GenLines
+target1.showInterface=false
+target1.type=ClassTarget
+target1.width=120
+target1.x=120
+target1.y=60
+target2.height=70
+target2.name=MyTIXY
+target2.showInterface=false
+target2.type=ClassTarget
+target2.width=120
+target2.x=200
+target2.y=210
+target3.height=70
+target3.name=Dot
+target3.showInterface=false
+target3.type=ClassTarget
+target3.width=120
+target3.x=420
+target3.y=140

examples/zm_raindrops/package.bluej

@@ -1,8 +1,8 @@
 #BlueJ package file
-editor.fx.0.height=728
+editor.fx.0.height=0
-editor.fx.0.width=1037
+editor.fx.0.width=0
-editor.fx.0.x=95
+editor.fx.0.x=0
-editor.fx.0.y=53
+editor.fx.0.y=0
 objectbench.height=94
 objectbench.width=776
 package.divider.horizontal=0.6

examples/zm_raindrops_oop/package.bluej

@@ -1,15 +1,15 @@
 #BlueJ package file
-dependency1.from=TIXY
+dependency1.from=GenLines
 dependency1.to=MyTIXY
 dependency1.type=UsesDependency
-dependency2.from=TIXY
+dependency2.from=GenLines
 dependency2.to=Dot
 dependency2.type=UsesDependency
 dependency3.from=MyTIXY
 dependency3.to=Dot
 dependency3.type=UsesDependency
 dependency4.from=Dot
-dependency4.to=TIXY
+dependency4.to=GenLines
 dependency4.type=UsesDependency
 editor.fx.0.height=728
 editor.fx.0.width=1037
@@ -36,7 +36,7 @@ readme.width=48
 readme.x=10
 readme.y=10
 target1.height=70
-target1.name=TIXY
+target1.name=GenLines
 target1.showInterface=false
 target1.type=ClassTarget
 target1.width=120

examples/zm_tixy/Dot.java

@@ -40,7 +40,7 @@ public class Dot implements Drawable {
 			color = DOT_WHITE;
 		}
 
-		value = Constants.limit(value, 1.0);
+		value = Constants.limit(value, 0.0, 1.0);
 		size = (int) (SIZE * value);
 	}
 
@@ -51,7 +51,7 @@ public class Dot implements Drawable {
 
 	@Override
 	public void draw( Graphics2D graphics ) {
-		graphics.setColor(color.getColor());
+		graphics.setColor(color.getJavaColor());
 		graphics.fillOval(GAP + x * (SIZE + GAP) + RADIUS - (size / 2), GAP + y * (SIZE + GAP) + RADIUS - (size / 2), size, size);
 	}
 

examples/zm_tixy/README.TXT

@@ -1,6 +1,6 @@
-# Zeichenmaschine: TIXY
+# Zeichenmaschine: GenLines
 
-TIXY ist ein kreatives Projekt, bei dem ein Feld von Punkten durch geschickt
+GenLines ist ein kreatives Projekt, bei dem ein Feld von Punkten durch geschickt
 gewählte mathematische Formeln animiert wird.
 
 Die Idee stammt von der Seite http://tixy.land

examples/zm_tixy/TIXY.java

@@ -60,4 +60,9 @@ public class TIXY extends Zeichenmaschine {
 		}
 	}
 
+	@Override
+	public void mousePressed() {
+		stop();
+	}
+
 }

examples/zm_tixy/package.bluej

@@ -1,15 +1,15 @@
 #BlueJ package file
-dependency1.from=TIXY
+dependency1.from=GenLines
 dependency1.to=MyTIXY
 dependency1.type=UsesDependency
-dependency2.from=TIXY
+dependency2.from=GenLines
 dependency2.to=Dot
 dependency2.type=UsesDependency
 dependency3.from=MyTIXY
 dependency3.to=Dot
 dependency3.type=UsesDependency
 dependency4.from=Dot
-dependency4.to=TIXY
+dependency4.to=GenLines
 dependency4.type=UsesDependency
 editor.fx.0.height=728
 editor.fx.0.width=1037
@@ -36,7 +36,7 @@ readme.width=48
 readme.x=10
 readme.y=10
 target1.height=70
-target1.name=TIXY
+target1.name=GenLines
 target1.showInterface=false
 target1.type=ClassTarget
 target1.width=120

examples/zm_wahlkamp/DatabaseConnector.java

@@ -0,0 +1,148 @@
+import java.sql.*;
+
+/**
+ * <p>
+ * Materialien zu den zentralen NRW-Abiturpruefungen im Fach Informatik ab 2018
+ * </p>
+ * <p>
+ * Klasse DatabaseConnector
+ * </p>
+ * <p>
+ * Ein Objekt der Klasse DatabaseConnector ermoeglicht die Abfrage und Manipulation 
+ * einer SQLite-Datenbank. 
+ * Beim Erzeugen des Objekts wird eine Datenbankverbindung aufgebaut, so dass 
+ * anschließend SQL-Anweisungen an diese Datenbank gerichtet werden koennen.
+ * </p>
+ * 
+ * @author Qualitaets- und UnterstuetzungsAgentur - Landesinstitut fuer Schule
+ * @version 2016-01-24
+ */
+public class DatabaseConnector{
+  private Connection connection;  
+  private QueryResult currentQueryResult = null;
+  private String message = null;
+
+  /**
+   * Ein Objekt vom Typ DatabaseConnector wird erstellt, und eine Verbindung zur Datenbank 
+   * wird aufgebaut. Mit den Parametern pIP und pPort werden die IP-Adresse und die 
+   * Port-Nummer uebergeben, unter denen die Datenbank mit Namen pDatabase zu erreichen ist. 
+   * Mit den Parametern pUsername und pPassword werden Benutzername und Passwort fuer die 
+   * Datenbank uebergeben.
+   */
+  public DatabaseConnector(String pIP, int pPort, String pDatabase, String pUsername, String pPassword){
+    //Eine Impementierung dieser Schnittstelle fuer SQLite ignoriert pID und pPort, da die Datenbank immer lokal ist. 
+    //Auch pUsername und pPassword werden nicht verwendet, da SQLite sie nicht unterstuetzt.
+    try {
+      //Laden der Treiberklasse
+      Class.forName("org.sqlite.JDBC");
+
+      //Verbindung herstellen
+      connection = DriverManager.getConnection("jdbc:sqlite:"+pDatabase);
+
+    } catch (Exception e) {
+      message = e.getMessage();
+    }
+  }
+
+  /**
+   * Der Auftrag schickt den im Parameter pSQLStatement enthaltenen SQL-Befehl an die 
+   * Datenbank ab. 
+   * Handelt es sich bei pSQLStatement um einen SQL-Befehl, der eine Ergebnismenge 
+   * liefert, so kann dieses Ergebnis anschließend mit der Methode getCurrentQueryResult 
+   * abgerufen werden.
+   */
+  public void executeStatement(String pSQLStatement){  
+    //Altes Ergebnis loeschen
+    currentQueryResult = null;
+    message = null;
+
+    try {
+      //Neues Statement erstellen
+      Statement statement = connection.createStatement();
+
+      //SQL Anweisung an die DB schicken.
+      if (statement.execute(pSQLStatement)) { //Fall 1: Es gibt ein Ergebnis
+
+        //Resultset auslesen
+        ResultSet resultset = statement.getResultSet();
+
+        //Spaltenanzahl ermitteln
+        int columnCount = resultset.getMetaData().getColumnCount();
+        
+        //Spaltennamen und Spaltentypen in Felder uebertragen
+        String[] resultColumnNames = new String[columnCount];
+        String[] resultColumnTypes = new String[columnCount];
+        for (int i = 0; i < columnCount; i++){
+          resultColumnNames[i] = resultset.getMetaData().getColumnLabel(i+1);
+          resultColumnTypes[i] = resultset.getMetaData().getColumnTypeName(i+1);
+        }
+
+        //Queue fuer die Zeilen der Ergebnistabelle erstellen
+        Queue<String[]> rows = new Queue<String[]>();
+
+        //Daten in Queue uebertragen und Zeilen zaehlen
+        int rowCount = 0;
+        while (resultset.next()){
+          String[] resultrow =  new String[columnCount];
+          for (int s = 0; s < columnCount; s++){
+            resultrow[s] = resultset.getString(s+1);
+          }
+          rows.enqueue(resultrow);
+          rowCount = rowCount + 1;
+        }
+
+        //Ergebnisfeld erstellen und Zeilen aus Queue uebertragen
+        String[][] resultData = new String[rowCount][columnCount];
+        int j = 0;
+        while (!rows.isEmpty()){
+          resultData[j] = rows.front();
+          rows.dequeue();          
+          j = j + 1;
+        }
+               
+        //Statement schließen und Ergebnisobjekt erstellen
+        statement.close();
+        currentQueryResult =  new QueryResult(resultData, resultColumnNames, resultColumnTypes); 
+
+      } else { //Fall 2: Es gibt kein Ergebnis.
+        //Statement ohne Ergebnisobjekt schliessen
+        statement.close();       
+      }
+
+    } catch (Exception e) {
+      //Fehlermeldung speichern
+      message = e.getMessage();
+    }
+  }
+
+  /**
+   * Die Anfrage liefert das Ergebnis des letzten mit der Methode executeStatement an 
+   * die Datenbank geschickten SQL-Befehls als Ob-jekt vom Typ QueryResult zurueck.
+   * Wurde bisher kein SQL-Befehl abgeschickt oder ergab der letzte Aufruf von 
+   * executeStatement keine Ergebnismenge (z.B. bei einem INSERT-Befehl oder einem 
+   * Syntaxfehler), so wird null geliefert.  
+   */  
+  public QueryResult getCurrentQueryResult(){
+    return currentQueryResult;
+  }
+
+  /**
+   * Die Anfrage liefert null oder eine Fehlermeldung, die sich jeweils auf die letzte zuvor ausgefuehrte 
+   * Datenbankoperation bezieht.
+   */
+  public String getErrorMessage(){
+    return message;
+  }
+
+  /**
+   * Die Datenbankverbindung wird geschlossen.
+   */
+  public void close(){
+    try{
+      connection.close();
+    } catch (Exception e) {
+      message = e.getMessage();
+    }
+  }
+
+}

examples/zm_wahlkamp/QueryResult.java

@@ -0,0 +1,76 @@
+/**
+ * <p>
+ * Materialien zu den zentralen NRW-Abiturpruefungen im Fach Informatik ab 2018
+ * </p>
+ * <p>
+ * Klasse QueryResult
+ * </p>
+ * <p>
+ * Ein Objekt der Klasse QueryResult stellt die Ergebnistabelle einer Datenbankanfrage mit Hilfe 
+ * der Klasse DatabaseConnector dar. Objekte dieser Klasse werden nur von der Klasse DatabaseConnector erstellt. 
+ * Die Klasse verfuegt ueber keinen oeffentlichen Konstruktor.
+ * </p>
+ * 
+ * @author Qualitaets- und UnterstuetzungsAgentur - Landesinstitut fuer Schule
+ * @version 2015-01-31
+ */
+public class QueryResult{
+  private String[][] data;
+  private String[] columnNames;
+  private String[] columnTypes;
+
+  /**
+   * Paketinterner Konstruktor.
+   */
+  QueryResult(String[][] pData, String[] pColumnNames, String[] pColumnTypes){
+    data = pData;
+    columnNames = pColumnNames;   
+    columnTypes = pColumnTypes;
+  }
+
+  /**
+   * Die Anfrage liefert die Eintraege der Ergebnistabelle als zweidimensionales Feld
+   * vom Typ String. Der erste Index des Feldes stellt die Zeile und der zweite die 
+   * Spalte dar (d.h. Object[zeile][spalte]).
+   */
+  public String[][] getData(){
+    return data;
+  }
+
+  /**
+   * Die Anfrage liefert die Bezeichner der Spalten der Ergebnistabelle als Feld vom 
+   * Typ String zurueck.
+   */
+  public String[] getColumnNames(){
+    return columnNames;
+  }
+
+  /**
+   * Die Anfrage liefert die Typenbezeichnung der Spalten der Ergebnistabelle als Feld 
+   * vom Typ String zurueck. Die Bezeichnungen entsprechen den Angaben in der MySQL-Datenbank.
+   */
+  public String[] getColumnTypes(){
+    return columnTypes;
+  }
+
+  /**
+   * Die Anfrage liefert die Anzahl der Zeilen der Ergebnistabelle als Integer.
+   */
+  public int getRowCount(){
+    if (data != null )
+      return data.length;
+    else 
+      return 0;
+  }
+
+  /**
+   * Die Anfrage liefert die Anzahl der Spalten der Ergebnistabelle als Integer.
+   */
+  public int getColumnCount(){
+    if (data != null && data.length > 0 && data[0] != null)
+      return data[0].length;
+    else
+      return 0;
+  }
+
+}

examples/zm_wahlkamp/Queue.java

@@ -0,0 +1,142 @@
+/**
+ * <p>
+ * Materialien zu den zentralen NRW-Abiturpruefungen im Fach Informatik ab 2018
+ * </p>
+ * <p>
+ * Generische Klasse Queue<ContentType>
+ * </p>
+ * <p>
+ * Objekte der generischen Klasse Queue (Warteschlange) verwalten beliebige
+ * Objekte vom Typ ContentType nach dem First-In-First-Out-Prinzip, d.h., das
+ * zuerst abgelegte Objekt wird als erstes wieder entnommen. Alle Methoden haben
+ * eine konstante Laufzeit, unabhaengig von der Anzahl der verwalteten Objekte.
+ * </p>
+ * 
+ * @author Qualitaets- und UnterstuetzungsAgentur - Landesinstitut fuer Schule
+ * @version Generisch_02 2014-02-21
+ */
+public class Queue<ContentType> {
+	
+	/* --------- Anfang der privaten inneren Klasse -------------- */
+	
+	private class QueueNode {
+
+		private ContentType content = null;
+		private QueueNode nextNode = null;
+
+		/**
+		 * Ein neues Objekt vom Typ QueueNode<ContentType> wird erschaffen. 
+		 * Der Inhalt wird per Parameter gesetzt. Der Verweis ist leer.
+		 * 
+		 * @param pContent das Inhaltselement des Knotens vom Typ ContentType
+		 */
+		public QueueNode(ContentType pContent) {
+			content = pContent;
+			nextNode = null;
+		}
+
+		/**
+		 * Der Verweis wird auf das Objekt, das als Parameter uebergeben wird,
+		 * gesetzt.
+		 * 
+		 * @param pNext der Nachfolger des Knotens
+		 */
+		public void setNext(QueueNode pNext) {
+			nextNode = pNext;
+		}
+		
+		/**
+		 * Liefert das naechste Element des aktuellen Knotens.
+		 * 
+		 * @return das Objekt vom Typ QueueNode, auf das der aktuelle Verweis zeigt
+		 */
+		public QueueNode getNext() {
+			return nextNode;
+		}
+
+		/**
+		 * Liefert das Inhaltsobjekt des Knotens vom Typ ContentType.
+		 * 
+		 * @return das Inhaltsobjekt des Knotens
+		 */
+		public ContentType getContent() {
+			return content;
+		}
+		
+	}
+	
+	/* ----------- Ende der privaten inneren Klasse -------------- */
+	
+	private QueueNode head;
+	private QueueNode tail;
+
+	/**
+	 * Eine leere Schlange wird erzeugt. 
+	 * Objekte, die in dieser Schlange verwaltet werden, muessen vom Typ
+	 * ContentType sein.
+	 */
+	public Queue() {
+		head = null;
+		tail = null;
+	}
+
+	/**
+	 * Die Anfrage liefert den Wert true, wenn die Schlange keine Objekte enthaelt, 
+	 * sonst liefert sie den Wert false.
+	 * 
+	 * @return true, falls die Schlange leer ist, sonst false
+	 */
+	public boolean isEmpty() {
+		return head == null;
+	}
+
+	/**
+	 * Das Objekt pContentType wird an die Schlange angehaengt. 
+	 * Falls pContentType gleich null ist, bleibt die Schlange unveraendert.
+	 * 
+	 * @param pContent
+	 *            das anzuhaengende Objekt vom Typ ContentType
+	 */
+	public void enqueue(ContentType pContent) {
+		if (pContent != null) {
+			QueueNode newNode = new QueueNode(pContent);
+			if (this.isEmpty()) {
+				head = newNode;
+				tail = newNode;
+			} else {
+				tail.setNext(newNode);
+				tail = newNode;
+			}
+		}
+	}
+
+	/**
+	 * Das erste Objekt wird aus der Schlange entfernt. 
+	 * Falls die Schlange leer ist, wird sie nicht veraendert.
+	 */
+	public void dequeue() {
+		if (!this.isEmpty()) {
+			head = head.getNext();
+			if (this.isEmpty()) {
+				head = null;
+				tail = null;
+			}
+		}
+	}
+
+	/**
+	 * Die Anfrage liefert das erste Objekt der Schlange. 
+	 * Die Schlange bleibt unveraendert. 
+	 * Falls die Schlange leer ist, wird null zurueckgegeben.
+	 *
+	 * @return das erste Objekt der Schlange vom Typ ContentType oder null,
+	 *         falls die Schlange leer ist
+	 */
+	public ContentType front() {
+		if (this.isEmpty()) {
+			return null;
+		} else {
+			return head.getContent();
+		}
+	}
+}

examples/zm_wahlkamp/Wahlkampf.java

@@ -0,0 +1,75 @@
+import schule.ngb.zm.Color;
+import schule.ngb.zm.Zeichenmaschine;
+import schule.ngb.zm.charts.*;
+
+public class Wahlkampf extends Zeichenmaschine {
+
+	public static void main( String[] args ) {
+		new Wahlkampf();
+	}
+
+	public Wahlkampf() {
+		super(800, 800, "Landtagswahl 2022 in Bielefeld");
+	}
+
+	public void draw() {
+		background.setColor(240);
+
+		DatabaseConnector dbc = new DatabaseConnector("", 0, "wahlergebnisse.db", "", "");
+		QueryResult res;
+
+		String[] parteien = new String[]{"CDU", "SPD", "FDP", "AfD", "GRÜNE", "DIELINKE", "PIRATEN"};
+		Color[] farben = new Color[]{BLACK, RED, YELLOW, BLUE, GREEN, MAGENTA, ORANGE};
+
+		// Erststimmen im Bezirk
+		StringBuilder sb = new StringBuilder("SELECT ");
+		for( int i = 0; i < parteien.length; i++ ) {
+			sb.append("SUM(");
+			sb.append('"');
+			sb.append('D');
+			sb.append(i+1);
+			sb.append('-');
+			sb.append(parteien[i]);
+			sb.append("Erstimmen");
+			sb.append('"');
+			sb.append(')');
+			if( i < parteien.length-1 ) {
+				sb.append(',');
+			}
+		}
+		sb.append(" FROM \"2022_Landtagswahl\"");
+
+		dbc.executeStatement(sb.toString());
+		res = dbc.getCurrentQueryResult();
+		if( res != null ) {
+			String[] data = res.getData()[0];
+
+			double[] values = new double[parteien.length];
+			for( int i = 0; i < data.length; i++ ) {
+				values[i] = Double.parseDouble(data[i]);
+			}
+			RingChart chart1 = new RingChart(200, 200, 100, parteien.length);
+			RingChart chart2 = new RingChart(600, 200, 100, parteien.length);
+			RingChart chart3 = new RingChart(200, 600, 100, parteien.length);
+			RingChart chart4 = new RingChart(600, 600, 100, parteien.length);
+
+			double s = sum(values);
+			for( int i = 0; i < values.length; i++ ) {
+				double value = values[i];
+				chart1.setValue(i, value, s, parteien[i], farben[i]);
+				chart2.setValue(i, value, s, parteien[i], farben[i]);
+				chart3.setValue(i, value, s, parteien[i], farben[i]);
+				chart4.setValue(i, value, s, parteien[i], farben[i]);
+			}
+
+			chart4.setStrokeColor(200);
+
+			shapes.add(chart1, chart2, chart3, chart4);
+		} else {
+			System.err.println(dbc.getErrorMessage());
+		}
+
+		pause();
+	}
+
+}

examples/zm_wahlkamp/package.bluej

@@ -0,0 +1,55 @@
+#BlueJ package file
+dependency1.from=Attractor
+dependency1.to=Gravity
+dependency1.type=UsesDependency
+dependency2.from=Gravity
+dependency2.to=Mover
+dependency2.type=UsesDependency
+dependency3.from=Gravity
+dependency3.to=Attractor
+dependency3.type=UsesDependency
+editor.fx.0.height=728
+editor.fx.0.width=1037
+editor.fx.0.x=95
+editor.fx.0.y=53
+objectbench.height=94
+objectbench.width=776
+package.divider.horizontal=0.6
+package.divider.vertical=0.8305369127516778
+package.editor.height=488
+package.editor.width=661
+package.editor.x=374
+package.editor.y=158
+package.frame.height=660
+package.frame.width=800
+package.numDependencies=3
+package.numTargets=3
+package.showExtends=true
+package.showUses=true
+project.charset=UTF-8
+readme.height=60
+readme.name=@README
+readme.width=48
+readme.x=10
+readme.y=10
+target1.height=70
+target1.name=Mover
+target1.showInterface=false
+target1.type=ClassTarget
+target1.width=120
+target1.x=380
+target1.y=220
+target2.height=70
+target2.name=Attractor
+target2.showInterface=false
+target2.type=ClassTarget
+target2.width=120
+target2.x=380
+target2.y=350
+target3.height=70
+target3.name=Gravity
+target3.showInterface=false
+target3.type=ClassTarget
+target3.width=120
+target3.x=120
+target3.y=120