import java.awt.Canvas;
import java.awt.Frame;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.image.BufferedImage;


public class ImageTest extends Canvas {
    public static void main(String[] args) {
	Frame frame = new Frame("Image testing");
	
	ImageTest instance = new ImageTest();
	
	frame.add(instance);
	frame.pack();
	frame.setVisible(true);
    }

    public Dimension getPreferredSize() {
	return new Dimension(256, 256);
    }

    BufferedImage backgroundImage;
    BufferedImage alphaImage;

    void initImage() {
	backgroundImage = (BufferedImage) createImage(256, 256);
        alphaImage = new BufferedImage(64, 64, BufferedImage.TYPE_INT_ARGB);

	for (int x=0; x<256; x++)
	    for (int y=0; y<256; y++) {
		int v = (int) (Math.sin(x/5F)*63+ (Math.cos(y/5F))*63 +128);
		int vv = (x<<16) | (y<<8) | v;
		backgroundImage.setRGB(x, y, vv);
	    }

	for (int x=0; x<64; x++)
	    for (int y=0; y<64; y++) {
		int a = Math.abs(y*8-255);
		int r = x*4;
		int g = y*4;
		int b = 255 - (x+y)*2;
		int vv = (a<<24) | (r<<16) | (g<<8) | b;
		alphaImage.setRGB(x, y, vv);
	    }
    }

    public void paint(Graphics gfx) {
	if (backgroundImage == null) initImage();

	gfx.drawImage(backgroundImage, 0, 0, this);

	gfx.setColor(Color.white);
	gfx.drawLine(0, 0, 255, 255);
	gfx.setColor(Color.black);
	gfx.drawLine(5, 0, 255, 250);
	gfx.drawLine(0, 5, 250, 255);
	gfx.setColor(Color.blue);
	gfx.drawLine(10, 0, 255, 245);
	gfx.setColor(Color.yellow);
	gfx.drawLine(20, 0, 255, 235);
	gfx.setColor(Color.red);
	gfx.drawLine(0, 10, 245, 255);
	gfx.setColor(Color.green);
	gfx.drawLine(0, 20, 235, 255);

	gfx.drawImage(alphaImage, 56, 56, this);
	gfx.drawImage(alphaImage, 76, 76, this);
	gfx.drawImage(alphaImage, 96, 96, this);
	gfx.drawImage(alphaImage, 116, 116, this);
	gfx.drawImage(alphaImage, 136, 136, this);
    }
}