Umsetzung von issue #7

Die Anker werden nun als Options.Direction Typ gespeichert und nicht mehr als konkreter Point2D. Die Ankerpunkte werden dann beim Zeichnen dynamisch berechnet. Dies ist intuitiver für die Benutzung von Ankern, da ein Anker, der auf CENTER gesetzt wurde auch nach Skalierung und Änderungen der Größe im Mittelpunkt der Form bleibt. Dies ist vor allem für die Ausrichtung von Texten hilfreich.

src/schule/ngb/zm/shapes/Arc.java

@@ -98,11 +98,6 @@ public class Arc extends Shape {
 		}
 	}
 
-	@Override
-	public void setAnchor( Options.Direction anchor ) {
-		calculateAnchor(width, height, anchor);
-	}
-
 	@Override
 	public java.awt.Shape getShape() {
 		return new Arc2D.Double(0, 0, width, height, startingangle, angle, type.awt_type);

src/schule/ngb/zm/shapes/Arrow.java

@@ -1,5 +1,6 @@
 package schule.ngb.zm.shapes;
 
+import org.jetbrains.annotations.NotNull;
 import schule.ngb.zm.Options;
 import schule.ngb.zm.Vector;
 
@@ -29,7 +30,7 @@ public class Arrow extends Line {
 	 *
 	 * @param vector
 	 */
-	public Arrow( Vector vector ) {
+	public Arrow( @NotNull Vector vector ) {
 		this(0, 0, vector.x, vector.y);
 	}
 
@@ -40,7 +41,7 @@ public class Arrow extends Line {
 	 * @param vector1
 	 * @param vector2
 	 */
-	public Arrow( Vector vector1, Vector vector2 ) {
+	public Arrow( @NotNull Vector vector1, @NotNull Vector vector2 ) {
 		this(vector1.x, vector1.y, vector2.x, vector2.y);
 	}
 
@@ -52,7 +53,7 @@ public class Arrow extends Line {
 	 * @param y
 	 * @param vector
 	 */
-	public Arrow( double x, double y, Vector vector ) {
+	public Arrow( double x, double y, @NotNull Vector vector ) {
 		this(x, y, x + vector.x, y + vector.y);
 	}
 
@@ -61,7 +62,7 @@ public class Arrow extends Line {
 	 *
 	 * @param line
 	 */
-	public Arrow( Line line ) {
+	public Arrow( @NotNull Line line ) {
 		this(line.x, line.y, line.x2, line.y2);
 		this.copyFrom(line);
 	}
@@ -150,16 +151,16 @@ public class Arrow extends Line {
 	}
 
 	@Override
-	public void draw( Graphics2D graphics, AffineTransform at ) {
+	public void draw( Graphics2D graphics, AffineTransform transform ) {
 		if( !visible ) {
 			return;
 		}
 
-		super.draw(graphics, at);
+		super.draw(graphics, transform);
 
 		java.awt.Shape head = getHeadShape();
-		if( at != null ) {
+		if( transform != null ) {
-			head = at.createTransformedShape(head);
+			head = transform.createTransformedShape(head);
 		}
 
 		Color currentColor = graphics.getColor();

src/schule/ngb/zm/shapes/Bounds.java

@@ -0,0 +1,30 @@
+package schule.ngb.zm.shapes;
+
+import java.awt.geom.Rectangle2D;
+
+public class Bounds extends Rectangle2D.Double {
+
+	public Bounds( double x, double y, double w, double h ) {
+		super(x,y,w,h);
+	}
+
+	public Bounds( Shape shape ) {
+		if( shape != null ) {
+			java.awt.Shape s = shape.getShape();
+			if( s != null ) {
+				s = shape.getTransform().createTransformedShape(s);
+				Rectangle2D bounds = s.getBounds2D();
+				x = bounds.getX();
+				y = bounds.getY();
+				width = bounds.getWidth();
+				height = bounds.getHeight();
+			} else {
+				x = shape.getX();
+				y = shape.getY();
+				width = 0;
+				height = 0;
+			}
+		}
+	}
+
+}

src/schule/ngb/zm/shapes/Circle.java

@@ -11,7 +11,6 @@ public class Circle extends Shape {
 	public Circle( double x, double y, double radius ) {
 		super(x, y);
 		this.radius = radius;
-		setAnchor(CENTER);
 	}
 
 	public Circle( Circle circle ) {
@@ -19,6 +18,16 @@ public class Circle extends Shape {
 		copyFrom(circle);
 	}
 
+	@Override
+	public double getWidth() {
+		return radius+radius;
+	}
+
+	@Override
+	public double getHeight() {
+		return radius+radius;
+	}
+
 	public double getRadius() {
 		return radius;
 	}
@@ -51,11 +60,6 @@ public class Circle extends Shape {
 		return new Ellipse2D.Double(0, 0, radius + radius, radius + radius);
 	}
 
-	@Override
-	public void setAnchor( Options.Direction anchor ) {
-		calculateAnchor(radius + radius, radius + radius, anchor);
-	}
-
 	@Override
 	public boolean equals( Object o ) {
 		if( this == o ) return true;

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

@@ -34,6 +34,16 @@ public class Curve extends Shape {
 		coordinates = Arrays.copyOf(curve.coordinates, curve.coordinates.length);
 	}
 
+	@Override
+	public double getWidth() {
+		return Math.abs(x-coordinates[coordinates.length-2]);
+	}
+
+	@Override
+	public double getHeight() {
+		return Math.abs(y-coordinates[coordinates.length-1]);
+	}
+
 	public Point2D getStart() {
 		return new Point2D.Double(x, y);
 	}
@@ -136,6 +146,9 @@ public class Curve extends Shape {
 	@Override
 	public void scale( double factor ) {
 		super.scale(factor);
+		/*for( int i = 0; i < coordinates.length; i++ ) {
+			coordinates[i] *= factor;
+		}*/
 		coordinates[coordinates.length - 4] *= factor;
 		coordinates[coordinates.length - 3] *= factor;
 		coordinates[coordinates.length - 2] *= factor;

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

@@ -1,31 +1,55 @@
 package schule.ngb.zm.shapes;
 
+import org.jetbrains.annotations.NotNull;
+
 import java.awt.geom.Path2D;
 
 public class CustomShape extends Shape {
 
 	protected Path2D.Double path;
 
+	private double width = 0.0, height = 0.0;
+
 	public CustomShape( double x, double y ) {
 		super(x, y);
 		path = new Path2D.Double();
 	}
 
-	public CustomShape( CustomShape custom ) {
+	public CustomShape( @NotNull CustomShape custom ) {
 		super(custom.x, custom.y);
 		path = custom.path;
+		calculateBounds();
+	}
+
+	@Override
+	public double getWidth() {
+		return width;
+	}
+
+	@Override
+	public double getHeight() {
+		return height;
+	}
+
+	private void calculateBounds() {
+		java.awt.Rectangle s = path.getBounds();
+		width = s.width;
+		height = s.height;
 	}
 
 	public void lineTo( double x, double y ) {
 		path.lineTo(x - x, y - y);
+		calculateBounds();
 	}
 
 	public void arcTo( double x1, double y1, double x2, double y2 ) {
 		path.quadTo(x1 - x, y1 - y, x2 - x, y2 - y);
+		calculateBounds();
 	}
 
 	public void curveTo( double x1, double y1, double x2, double y2, double x3, double y3 ) {
 		path.curveTo(x1 - x, y1 - y, x2 - x, y2 - y, x3 - x, y3 - y);
+		calculateBounds();
 	}
 
 	public void close() {

src/schule/ngb/zm/shapes/Ellipse.java

@@ -14,7 +14,7 @@ public class Ellipse extends Shape {
 		super(x, y);
 		this.width = width;
 		this.height = height;
-		setAnchor(CENTER);
+		this.anchor = Options.Direction.CENTER;
 	}
 
 	public Ellipse( Ellipse ellipse ) {
@@ -22,18 +22,20 @@ public class Ellipse extends Shape {
 		copyFrom(ellipse);
 	}
 
+	@Override
 	public double getWidth() {
 		return width;
 	}
 
-	public void setWidth( double width ) {
+	@Override
-		this.width = width;
-	}
-
 	public double getHeight() {
 		return height;
 	}
 
+	public void setWidth( double width ) {
+		this.width = width;
+	}
+
 	public void setHeight( double height ) {
 		this.height = height;
 	}
@@ -60,11 +62,6 @@ public class Ellipse extends Shape {
 		height *= factor;
 	}
 
-	@Override
-	public void setAnchor( Options.Direction anchor ) {
-		calculateAnchor(width, height, anchor);
-	}
-
 	@Override
 	public java.awt.Shape getShape() {
 		return new Ellipse2D.Double(0, 0, width, height);

src/schule/ngb/zm/shapes/Kite.java

@@ -21,7 +21,7 @@ public class Kite extends Shape {
 		this.width = width;
 		this.height = height;
 		this.ratio = ratio;
-		setAnchor(CENTER);
+		this.anchor = Options.Direction.CENTER;
 	}
 
 	public Kite( Kite pKite ) {
@@ -29,6 +29,7 @@ public class Kite extends Shape {
 		copyFrom(pKite);
 	}
 
+	@Override
 	public double getWidth() {
 		return width;
 	}
@@ -37,6 +38,7 @@ public class Kite extends Shape {
 		this.width = width;
 	}
 
+	@Override
 	public double getHeight() {
 		return height;
 	}
@@ -76,11 +78,6 @@ public class Kite extends Shape {
 		height *= factor;
 	}
 
-	@Override
-	public void setAnchor( Options.Direction anchor ) {
-		calculateAnchor(width, height, anchor);
-	}
-
 	@Override
 	public java.awt.Shape getShape() {
 		double hHalf = width * .5, hRatio = ratio * height;

src/schule/ngb/zm/shapes/Line.java

@@ -1,5 +1,6 @@
 package schule.ngb.zm.shapes;
 
+import org.jetbrains.annotations.NotNull;
 import schule.ngb.zm.Options;
 
 import java.awt.geom.Line2D;
@@ -16,7 +17,7 @@ public class Line extends Shape {
 		this.y2 = y2;
 	}
 
-	public Line( Line line ) {
+	public Line( @NotNull Line line ) {
 		this(line.x, line.y, line.x2, line.y2);
 		copyFrom(line);
 	}
@@ -37,6 +38,21 @@ public class Line extends Shape {
 		this.y2 = y;
 	}
 
+	@Override
+	public double getWidth() {
+		return Math.abs(x2-x);
+	}
+
+	@Override
+	public double getHeight() {
+		return Math.abs(y2-y);
+	}
+
+	@Override
+	public Bounds getBounds() {
+		return new Bounds(Math.min(x,x2), Math.min(y,y2), getWidth(), getHeight());
+	}
+
 	@Override
 	public void scale( double factor ) {
 		super.scale(factor);
@@ -75,11 +91,6 @@ public class Line extends Shape {
 		y2 += dy;
 	}
 
-	@Override
-	public void setAnchor( Options.Direction anchor ) {
-		calculateAnchor(x2 - x, y2 - y, anchor);
-	}
-
 	@Override
 	public java.awt.Shape getShape() {
 		return new Line2D.Double(0, 0, x2 - x, y2 - y);

src/schule/ngb/zm/shapes/Picture.java

@@ -35,7 +35,7 @@ public class Picture extends Shape {
 
 		width = image.getWidth();
 		height = image.getHeight();
-		setAnchor(CENTER);
+		this.anchor = Options.Direction.CENTER;
 	}
 
 	public Picture( Picture picture ) {
@@ -60,7 +60,6 @@ public class Picture extends Shape {
 
 			width = image.getWidth();
 			height = image.getHeight();
-			setAnchor(shape.getAnchor());
 		}
 	}
 
@@ -69,7 +68,7 @@ public class Picture extends Shape {
 	}
 
 	public void setWidth( double width ) {
-		scale(width / width);
+		scale(width / this.width);
 	}
 
 	public double getHeight() {
@@ -77,18 +76,13 @@ public class Picture extends Shape {
 	}
 
 	public void setHeight( double height ) {
-		scale(height / height);
+		scale(height / this.height);
 	}
 
 	public BufferedImage getImage() {
 		return image;
 	}
 
-	@Override
-	public void setAnchor( Options.Direction anchor ) {
-		calculateAnchor(width, height, anchor);
-	}
-
 	@Override
 	public void scale( double factor ) {
 		super.scale(factor);
@@ -114,7 +108,7 @@ public class Picture extends Shape {
 	*/
 
 	@Override
-	public void draw( Graphics2D graphics, AffineTransform pVerzerrung ) {
+	public void draw( Graphics2D graphics, AffineTransform transform ) {
 		if( !visible ) {
 			return;
 		}

src/schule/ngb/zm/shapes/Point.java

@@ -20,7 +20,7 @@ public class Point extends Circle {
 	/**
 	 * Erstellt ein Punktobjekt mit den Koordinaten des übergebenen
 	 * {@link schule.ngb.zm.Vector Vektors}.
-	 * @param point
+	 * @param vector
 	 */
 	public Point( schule.ngb.zm.Vector vector ) {
 		super(vector.x, vector.y, POINT_RADIUS);
@@ -52,7 +52,7 @@ public class Point extends Circle {
 	@Override
 	public void setAnchor( Options.Direction anchor ) {
 		// Punkte sind immer im Zentrum verankert
-		calculateAnchor(radius + radius, radius + radius, CENTER);
+		super.setAnchor(Options.Direction.CENTER);
 	}
 
 }

src/schule/ngb/zm/shapes/Polygon.java

@@ -7,6 +7,8 @@ public class Polygon extends Shape {
 
 	protected Point2D[] points;
 
+	private double width = 0.0, height = 0.0;
+
 	public Polygon( double x, double y, Point2D... points ) {
 		super(x, y);
 
@@ -14,6 +16,8 @@ public class Polygon extends Shape {
 		for( int i = 0; i < points.length; i++ ) {
 			this.points[i] = new Point2D.Double(points[i].getX() - x, points[i].getY() - y);
 		}
+
+		calculateBounds();
 	}
 
 	public Polygon( Point2D... points ) {
@@ -25,6 +29,8 @@ public class Polygon extends Shape {
 			}
 			this.points[i] = new Point2D.Double(points[i].getX() - x, points[i].getY() - y);
 		}
+
+		calculateBounds();
 	}
 
 	public Polygon( double x1, double y1, double x2, double y2, double... coordinates ) {
@@ -38,6 +44,8 @@ public class Polygon extends Shape {
 		for( int i = 0; i < numPoints - 2; i += 1 ) {
 			this.points[i + 2] = new Point2D.Double(coordinates[i * 2] - x1, coordinates[i * 2 + 1] - y1);
 		}
+
+		calculateBounds();
 	}
 
 	public Polygon( Polygon polygon ) {
@@ -45,6 +53,22 @@ public class Polygon extends Shape {
 		copyFrom(polygon);
 	}
 
+	@Override
+	public double getWidth() {
+		return width;
+	}
+
+	@Override
+	public double getHeight() {
+		return height;
+	}
+
+	private void calculateBounds() {
+		java.awt.Rectangle s = getShape().getBounds();
+		width = s.width;
+		height = s.height;
+	}
+
 	public Point2D[] getPoints() {
 		return points;
 	}
@@ -60,6 +84,7 @@ public class Polygon extends Shape {
 				points[i] = new Point2D.Double(v.points[i].getX(), v.points[i].getY());
 			}
 		}
+		calculateBounds();
 	}
 
 	@Override

src/schule/ngb/zm/shapes/Rectangle.java

@@ -14,7 +14,7 @@ public class Rectangle extends Shape {
 		super(x, y);
 		this.width = width;
 		this.height = height;
-		setAnchor(NORTHWEST);
+		this.anchor = Options.Direction.NORTHWEST;
 	}
 
 	public Rectangle( Rectangle pRechteck ) {
@@ -36,23 +36,24 @@ public class Rectangle extends Shape {
 		strokeType = DASHED;
 	}
 
+	@Override
 	public double getWidth() {
 		return width;
 	}
 
+	@Override
+	public double getHeight() {
+		return height;
+	}
+
 	public void setWidth( double width ) {
 		this.width = width;
 	}
 
-	public double getHeight() {
-		return height;
-	}
-
 	public void setHeight( double height ) {
 		this.height = height;
 	}
 
-
 	@Override
 	public Rectangle copy() {
 		return new Rectangle(this);
@@ -80,11 +81,6 @@ public class Rectangle extends Shape {
 		return new Rectangle2D.Double(0, 0, width, height);
 	}
 
-	@Override
-	public void setAnchor( Options.Direction anchor ) {
-		calculateAnchor(width, height, anchor);
-	}
-
 	@Override
 	public boolean equals( Object o ) {
 		if( this == o ) return true;

src/schule/ngb/zm/shapes/Rhombus.java

@@ -4,7 +4,6 @@ public class Rhombus extends Kite {
 
 	public Rhombus( double x, double y, double width, double height ) {
 		super(x, y, width, height, 0.5);
-		setAnchor(CENTER);
 	}
 
 	public Rhombus( Rhombus rhombus ) {

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

@@ -3,10 +3,10 @@ package schule.ngb.zm.shapes;
 import org.jetbrains.annotations.NotNull;
 import schule.ngb.zm.Options;
 
-import java.awt.*;
+import java.awt.Color;
+import java.awt.Graphics2D;
 import java.awt.geom.AffineTransform;
 import java.awt.geom.Point2D;
-import java.awt.geom.Rectangle2D;
 
 public abstract class Shape extends FilledShape {
 
@@ -20,7 +20,7 @@ public abstract class Shape extends FilledShape {
 
 	protected boolean visible = true;
 
-	protected Point2D.Double anchor = new Point2D.Double();
+	protected Options.Direction anchor = Options.Direction.CENTER;
 
 	public Shape( double x, double y ) {
 		this.x = x;
@@ -47,6 +47,32 @@ public abstract class Shape extends FilledShape {
 		this.y = y;
 	}
 
+	/**
+	 * Gibt die Breite dieser Form zurück.
+	 * <p>
+	 * Die Breite einer Form ist immer die Breite ihrer Begrenzung, <b>bevor</b>
+	 * Drehungen und andere Transformationen auf sei angewandt wurden.
+	 * <p>
+	 * Die Begrenzungen der tatsächlich gezeichneten Form kann mit {@link #getBounds()}
+	 * abgerufen werden.
+	 *
+	 * @return
+	 */
+	public abstract double getWidth();
+
+	/**
+	 * Gibt die Höhe dieser Form zurück.
+	 * <p>
+	 * Die Höhe einer Form ist immer die Höhe ihrer Begrenzung, <b>bevor</b>
+	 * Drehungen und andere Transformationen auf sei angewandt wurden.
+	 * <p>
+	 * Die Begrenzungen der tatsächlich gezeichneten Form kann mit {@link #getBounds()}
+	 * abgerufen werden.
+	 *
+	 * @return
+	 */
+	public abstract double getHeight();
+
 	public double getRotation() {
 		return rotation;
 	}
@@ -71,114 +97,84 @@ public abstract class Shape extends FilledShape {
 		visible = !visible;
 	}
 
-	public Point2D.Double getAnchor() {
+	public Options.Direction getAnchor() {
-		return new Point2D.Double(anchor.x, anchor.y);
+		return anchor;
 	}
 
 	/**
 	 * Setzt den Ankerpunkt der Form basierend auf der angegebenen
 	 * {@link Options.Direction Richtung}.
-	 *
+	 * <p>
 	 * Für das Setzen des Ankers muss das {@link #getBounds() begrenzende
 	 * Rechteck} berechnet werden. Unterklassen sollten die Methode
 	 * überschreiben, wenn der Anker auch direkt gesetzt werden kann.
+	 *
 	 * @param anchor
 	 */
 	public void setAnchor( Options.Direction anchor ) {
-		java.awt.Shape shape = getShape();
-		if( shape != null ) {
-			Rectangle2D bounds = shape.getBounds2D();
-			calculateAnchor(bounds.getWidth(), bounds.getHeight(), anchor);
-		} else {
-			this.anchor.x = 0;
-			this.anchor.y = 0;
-		}
-	}
-
-	/**
-	 * Setzt den Ankerpunkt explizit auf den angegebenen
-	 * @param anchor
-	 */
-	public void setAnchor( Point2D.Double anchor ) {
-		setAnchor(anchor, false);
-	}
-
-	public void setAnchor( Point2D.Double anchor, boolean isRelative ) {
 		if( anchor != null ) {
-			setAnchor(anchor.x, anchor.y, isRelative);
+			this.anchor = anchor;
-		} else {
-			setAnchor(0, 0, true);
-		}
-	}
-
-	public void setAnchor( double x, double y ) {
-		setAnchor(x, y, false);
-	}
-
-	public void setAnchor( double x, double y, boolean isRelative ) {
-		if( isRelative ) {
-			this.anchor.x = x;
-			this.anchor.y = y;
-		} else {
-			this.anchor.x = this.x-x;
-			this.anchor.y = this.y-y;
 		}
 	}
 
 	/**
-	 * Hilfsmethode zur Berechnung eines Ankerpunktes relativ zu den angegebenen
+	 * Bestimmt den Ankerpunkt der Form relativ zur oberen linken Ecke und
-	 * Begrenzungen basierend aus {@link #x}-, {@link #y}-Koordinate und
+	 * abhängig vom gesetzten {@link #setAnchor(Options.Direction) Anker}.
-	 * <var>width</var> / <var>height</var> (Breite / Höhe).
-	 * @param width
-	 * @param height
-	 * @param anchor
 	 */
-	protected void calculateAnchor( double width, double height, @NotNull Options.Direction anchor ) {
+	public Point2D.Double getAnchorPoint() {
-		double bHalf = width * .5, hHalf = height * .5;
+		Point2D.Double anchorpoint = new Point2D.Double(0, 0);
-		// pAnker == CENTER
+
-		this.anchor.x = bHalf;
+		double bHalf = getWidth() * .5, hHalf = getHeight() * .5;
-		this.anchor.y = hHalf;
+		// anchor == CENTER
+		anchorpoint.x = bHalf;
+		anchorpoint.y = hHalf;
+
 		if( NORTH.is(anchor) ) {
-			this.anchor.y -= hHalf;
+			anchorpoint.y -= hHalf;
 		}
 		if( SOUTH.is(anchor) ) {
-			this.anchor.y += hHalf;
+			anchorpoint.y += hHalf;
 		}
 		if( WEST.is(anchor) ) {
-			this.anchor.x -= bHalf;
+			anchorpoint.x -= bHalf;
 		}
 		if( EAST.is(anchor) ) {
-			this.anchor.x += bHalf;
+			anchorpoint.x += bHalf;
 		}
+
+		return anchorpoint;
 	}
 
 	/**
 	 * Kopiert die Eigenschaften der übergebenen Form in diese.
-	 *
+	 * <p>
 	 * Unterklassen sollten diese Methode überschreiben, um weitere Eigenschaften
 	 * zu kopieren (zum Beispiel den Radius eines Kreises). Mit dem Aufruf
 	 * <code>super.copyFrom(shape)</code> sollten die Basiseigenschaften
 	 * kopiert werden.
+	 *
 	 * @param shape
 	 */
 	public void copyFrom( Shape shape ) {
-		moveTo(shape.x, shape.y);
+		if( shape != null ) {
-		setFillColor(shape.getFillColor());
+			moveTo(shape.x, shape.y);
-		setStrokeColor(shape.getStrokeColor());
+			setFillColor(shape.getFillColor());
-		setStrokeWeight(shape.getStrokeWeight());
+			setStrokeColor(shape.getStrokeColor());
-		setStrokeType(shape.getStrokeType());
+			setStrokeWeight(shape.getStrokeWeight());
-		visible = shape.isVisible();
+			setStrokeType(shape.getStrokeType());
-		rotation = shape.rotation;
+			visible = shape.isVisible();
-		scale(shape.scale);
+			rotation = shape.rotation;
-		setAnchor(shape.getAnchor());
+			scale(shape.scale);
+			setAnchor(shape.getAnchor());
+		}
 	}
 
 	public abstract Shape copy();
 
 	public abstract java.awt.Shape getShape();
 
-	public Rectangle getBounds() {
+	public Bounds getBounds() {
-		return new Rectangle(this);
+		return new Bounds(this);
 	}
 
 	public void move( double dx, double dy ) {
@@ -193,8 +189,6 @@ public abstract class Shape extends FilledShape {
 
 	public void scale( double factor ) {
 		scale = factor;
-		anchor.x *= factor;
-		anchor.y *= factor;
 	}
 
 	public void scaleBy( double factor ) {
@@ -214,6 +208,8 @@ public abstract class Shape extends FilledShape {
     }*/
 
 	public AffineTransform getTransform() {
+		Point2D.Double anchor = getAnchorPoint();
+
 		AffineTransform transform = new AffineTransform();
 		transform.translate(x, y);
 		transform.rotate(Math.toRadians(rotation));
@@ -237,17 +233,17 @@ public abstract class Shape extends FilledShape {
 	 * matrix an. Wird u.A. von der {@link ShapeGroup} verwendet.
 	 *
 	 * @param graphics
-	 * @param pVerzerrung
+	 * @param transform
 	 */
-	public void draw( Graphics2D graphics, AffineTransform pVerzerrung ) {
+	public void draw( Graphics2D graphics, AffineTransform transform ) {
 		if( !visible ) {
 			return;
 		}
 
 		java.awt.Shape shape = getShape();
 		if( shape != null ) {
-			if( pVerzerrung != null ) {
+			if( transform != null ) {
-				shape = pVerzerrung.createTransformedShape(shape);
+				shape = transform.createTransformedShape(shape);
 			}
 
 			Color currentColor = graphics.getColor();

src/schule/ngb/zm/shapes/ShapeGroup.java

@@ -13,6 +13,10 @@ public class ShapeGroup extends Shape {
 
 	private List<Shape> shapes;
 
+	protected double width = -1.0;
+
+	protected double height = -1.0;
+
 	public ShapeGroup() {
 		super();
 		shapes = new ArrayList<>(10);
@@ -29,7 +33,7 @@ public class ShapeGroup extends Shape {
 		for( Shape pShape : shapes ) {
 			this.shapes.add(pShape);
 		}
-		setAnchor(CENTER);
+		this.anchor = Options.Direction.CENTER;
 	}
 
 	public Shape copy() {
@@ -41,6 +45,7 @@ public class ShapeGroup extends Shape {
 		for( Shape shape : shapes ) {
 			add(shape, false);
 		}
+		invalidateBounds();
 	}
 
 	public void add( Shape pShape, boolean relative ) {
@@ -49,15 +54,18 @@ public class ShapeGroup extends Shape {
 			pShape.y = pShape.y - y;
 		}
 		shapes.add(pShape);
+		invalidateBounds();
 	}
 
 	public void removeAll() {
 		shapes.clear();
+		invalidateBounds();
 	}
 
 	public List<Shape> getShapes() {
 		return shapes;
 	}
+
 	public <ShapeType extends Shape> List<ShapeType> getShapes( Class<ShapeType> typeClass ) {
 		LinkedList<ShapeType> list = new LinkedList<>();
 		for( Shape s: shapes ) {
@@ -70,6 +78,7 @@ public class ShapeGroup extends Shape {
 
 	public void remove( Shape shape ) {
 		shapes.remove(shape);
+		invalidateBounds();
 	}
 
 	public Shape get( int index ) {
@@ -89,22 +98,39 @@ public class ShapeGroup extends Shape {
 	}
 
 	@Override
-	public void setAnchor( Options.Direction anchor ) {
+	public double getWidth() {
+		if( width < 0 ) {
+			calculateBounds();
+		}
+		return width;
+	}
+
+	@Override
+	public double getHeight() {
+		if( height < 0 ) {
+			calculateBounds();
+		}
+		return height;
+	}
+
+	private void invalidateBounds() {
+		width = -1.0;
+		height = -1.0;
+	}
+
+	private void calculateBounds() {
 		double minx = Double.MAX_VALUE, miny = Double.MAX_VALUE,
 			maxx = Double.MIN_VALUE, maxy = Double.MIN_VALUE;
 		for( Shape pShape : shapes ) {
-			Rectangle bounds = pShape.getBounds();
+			Bounds bounds = pShape.getBounds();
-			if( bounds.x < minx )
+			minx = Math.min(minx, bounds.x);
-				minx = bounds.x;
+			maxx = Math.max(maxx, bounds.x+bounds.width);
-			if( bounds.y < miny )
+			miny = Math.min(miny, bounds.y);
-				miny = bounds.y;
+			maxy = Math.max(maxy, bounds.y+bounds.height);
-			if( bounds.x+bounds.width > maxx )
-				maxx = bounds.x+bounds.width;
-			if( bounds.y+bounds.height > maxy )
-				maxy = bounds.y+bounds.height;
 		}
 
-		calculateAnchor(maxx-minx, maxy-miny, anchor);
+		width = maxx-minx;
+		height = maxy-miny;
 	}
 
 	@Override
@@ -117,20 +143,22 @@ public class ShapeGroup extends Shape {
 	}
 
 	@Override
-	public void draw( Graphics2D graphics, AffineTransform pVerzerrung ) {
+	public void draw( Graphics2D graphics, AffineTransform transform ) {
 		if( !visible ) {
 			return;
 		}
 
+		/*
 		AffineTransform verzerrung = new AffineTransform();
 		verzerrung.translate(x, y);
 		verzerrung.rotate(Math.toRadians(rotation));
 		//verzerrung.scale(skalierung, skalierung);
 		verzerrung.translate(-anchor.x, -anchor.y);
+		*/
 
 		for( Shape f: shapes ) {
 			AffineTransform af = f.getTransform();
-			af.preConcatenate(verzerrung);
+			af.preConcatenate(transform);
 			f.draw(graphics, af);
 		}
 	}

src/schule/ngb/zm/shapes/Text.java

@@ -25,6 +25,42 @@ public class Text extends Shape {
 		copyFrom(text);
 	}
 
+	public double getWidth() {
+		return width;
+	}
+
+	public double getHeight() {
+		return height;
+	}
+
+	public Font getFont() {
+		return font;
+	}
+
+	public void setFontsize( double size ) {
+		font = font.deriveFont((float) size);
+		calculateBounds();
+	}
+
+	public String getText() {
+		return text;
+	}
+
+	public void setText( String pText ) {
+		text = pText;
+		calculateBounds();
+	}
+
+	private void calculateBounds() {
+		//GraphicsDevice gd;
+		//gd.getDefaultConfiguration().createCompatibleImage(1,1);
+		Canvas metricsCanvas = new Canvas();
+		FontMetrics metrics = metricsCanvas.getFontMetrics(font);
+		width = metrics.stringWidth(text);
+		//height = metrics.getHeight();
+		height = metrics.getDescent() + metrics.getAscent();
+	}
+
 	public Shape copy() {
 		return new Text(this);
 	}
@@ -36,6 +72,7 @@ public class Text extends Shape {
 			Text pText = (Text) shape;
 			this.text = pText.getText();
 			this.font = pText.getFont();
+			calculateBounds();
 		}
 	}
 
@@ -45,50 +82,13 @@ public class Text extends Shape {
 		setFontsize(font.getSize2D() * factor);
 	}
 
-	public Font getFont() {
-		return font;
-	}
-
-	public void setFontsize( double size ) {
-		font = font.deriveFont((float) size);
-		setText(text);
-	}
-
-	public String getText() {
-		return text;
-	}
-
-	public void setText( String pText ) {
-		text = pText;
-
-		Canvas metricsCanvas = new Canvas();
-		FontMetrics metrics = metricsCanvas.getFontMetrics(font);
-		width = metrics.stringWidth(text);
-		height = metrics.getDescent() + metrics.getAscent();
-		ascent = metrics.getAscent();
-
-		setAnchor(CENTER);
-	}
-
-	public double getWidth() {
-		return width;
-	}
-
-	public double getHeight() {
-		return height;
-	}
-
-	public void setAnchor( Options.Direction anchor ) {
-		calculateAnchor(width, ascent - height, anchor);
-	}
-
 	@Override
 	public java.awt.Shape getShape() {
 		return new Rectangle2D.Double(0, 0, width, height);
 	}
 
 	@Override
-	public void draw( Graphics2D graphics, AffineTransform pVerzerrung ) {
+	public void draw( Graphics2D graphics, AffineTransform transform ) {
 		if( !visible ) {
 			return;
 		}
@@ -101,10 +101,10 @@ public class Text extends Shape {
 		// Neue Werte setzen
 		graphics.setFont(font);
 		graphics.setColor(strokeColor.getColor());
-		graphics.transform(pVerzerrung);
+		graphics.transform(transform);
 
 		// Draw text
-		FontMetrics fm = graphics.getFontMetrics();
+		//FontMetrics fm = graphics.getFontMetrics();
 		//graphics.drawString(text, (float) (x - fm.stringWidth(text)/2.0), (float) (y + fm.getDescent()));
 		graphics.drawString(text, 0, 0);