Hello,

I would like to draw multiple partially overlapping figures in xor mode (applying the even-odd rule) and then place the drawing on another image.

I've  tried this on a JPanel:

public void paintComponent(Graphics g) {
        super.paintComponent( g );
        Graphics2D g2 = (Graphics2D) g;

        Dimension d = getSize();
        int w = d.width;
        int h = d.height;

        BufferedImage buffImg = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
        Graphics2D gbi = buffImg.createGraphics();

        gbi.setColor(new Color(1f,1f,1f,0f));  // I except that it clears the Graphics with "white" transparent color
        gbi.fillRect(0, 0, d.width, d.height);

        gbi.setXORMode(new Color(0f,0f,1f, 1f)); // it would be tell Graphics to alternate opaque blue and transparent white

        int rectx = w/4;  // draw the two partially overlapping figure
        int recty = h/4;
        gbi.fill(new Rectangle2D.Double(rectx, recty, 150, 100));
        gbi.fill(new Ellipse2D.Double(rectx+rectx/2,recty+recty/2,150,100));

        g2.setColor(Color.green);
        g2.fillRect(30,30, 100, 140);  // it shows what happens with the previously drawed things

        g2.drawImage(buffImg, null, 0, 0);
    }

It draws only the green rectangle, ie. the BufferedImage contains tansparency only. :(
If I change the clearing transparent white to this way
        gbi.setColor(new Color(1f,1f,1f,1f)); // opaque white
then the blue figures shows correctly, but the green rectangle goes away because of no transparency.

What did I wrong?

Any working solution/idea would be greatly appreciated.

Thanks,
Feri