Scaling a Graphics2D object

Question

hi there! i have this drawing in a Graphics2D object and if I render it it takes around 2 seconds to load. if i scale it before I render it takes like 4 seconds to show up? is there anyway to speed this up?
heres some of my code:
  public void paint(Graphics g){
        Graphics2D g2d = (Graphics2D) g; 
        g2d.scale(0.5, 0.5); //// heres the line that slows down the system!
        for (int y = 0; y < 256; y++) {
            for (int x = 0; x < 256; x++) {
                g2d.setPaint(new Color((int) Mod.mod(tree[0].evaluate(v), 255), (int) Mod.mod(tree[1].evaluate(v), 255), (int) Mod.mod(tree[2].evaluate(v), 255)));
                g2d.drawRect(x, y, 0, 0);
    }Mind the drawing method, Im actually evulating an expression tree for each pixel on the canvas (256x256) so it produces a random pattern.

Answer 1

Something I forgot earlier: if you apply transforms to your Graphics context, you need to undo those when your done. I.e. the paint method should actually look like this:public void paint(Graphics g){
  Graphics2D g2d = (Graphics2D) g;
  AffineTransform oldTransform = g2d.getTransform();
  // apply whatever transforms you need
  // calculate the position of the image's upper left corner
  int x = ...;
  int y = ...;
  g2d.drawImage(image, x, y, null);
  g2d.setTransform(oldTransform);
}If you modify the Graphics context in other ways (e.g. setting a Color, Stroke, etc), too, it might be easier to work on a copy though:public void paint(Graphics g){
  Graphics2D g2d = (Graphics2D) ((Graphics2D) g).create();
  // apply whatever transforms you need
  // calculate the position of the image's upper left corner
  int x = ...;
  int y = ...;
  g2d.drawImage(image, x, y, null);
  g2d.dispose();
}