Класс графики с учётом матрицы преобразований

src/com/annimon/graphics/GraphicsExt.java

@@ -15,7 +15,8 @@ public class GraphicsExt {
     private final Graphics g;
     private final int width, height;
     
-    private double oldX, oldY;
+    private Point old;
+    private Matrix transformMatrix;
 
     public GraphicsExt(Graphics g, int width, int height) {
         this.g = g;
@@ -24,22 +25,55 @@ public class GraphicsExt {
         g.setColor(Color.BLACK);
         this.width = width;
         this.height = height;
-        oldX = oldY = 0;
+        old = new Point();
+        
+        transformMatrix = new Matrix();
     }
     
     public void move(double x, double y) {
-        oldX = x;
-        oldY = y;
+        old.setX(x);
+        old.setY(y);
+    }
+    
+    public void move(Point point) {
+        old = point;
     }
     
     public void draw(double x, double y) {
-        line(oldX, oldY, x, y);
-        oldX = x;
-        oldY = y;
+        Point point = new Point(x, y);
+        line(old, point);
+        old = point;
+    }
+    
+    public void draw(Point point) {
+        line(old, point);
+        old = point;
+    }
+    
+    public void reset() {
+        transformMatrix.reset();
+    }
+    
+    public void rotate(double angle) {
+        transformMatrix = transformMatrix.multiply(Matrix.createRotationMatrix(angle));
+    }
+    
+    public void translate(double tx, double ty) {
+        transformMatrix.translate(tx, ty);
+    }
+    
+    public void scale(double value) {
+        transformMatrix.multiply(value);
     }
     
     public void line(double x1, double y1, double x2, double y2) {
-        g.drawLine(convertX(x1), convertY(y1), convertX(x2), convertY(y2));
+        line(new Point(x1, x2), new Point(x2, y2));
+    }
+    
+    public void line(Point from, Point to) {
+        double[] p1 = transformMatrix.applyTransform(from.getVector3());
+        double[] p2 = transformMatrix.applyTransform(to.getVector3());
+        g.drawLine(convertX(p1[0]), convertY(p1[1]), convertX(p2[0]), convertY(p2[1]));
     }
     
     private int convertX(double x) {