如何在Java Applet中测试像素的颜色？

Question

I have been doing some searching, and I have not found anything that suits my needs. I have a small game applet I am writing in Java. I am curious if there is a way for me to obtain the color value (preferably RGB format) of a pixel on the Applet Viewer screen. I am planning on using this to detect collisions. Is there a way to get the color values of a pixel on the Java Applet screen?

Answer 1

1. Create a BufferedImage, with the width/height of your applet.
2. Create a Graphics2D object by calling createGraphics() on your BufferedImage object.
3. Pass this Graphics2D object to the paint method of your applet - now the applet will be painted on your BufferedImage.
4. Call dispose() on your Graphics2D object.
5. Examine the pixel colors in your BufferedImage.

BTW, Andrew Thompson is probably right when he says that this must be an ineffective way of calculating collisions. Probably you should be looking into the intersects method of Rectangle. Or for best results use a game engine, they have support for collision detection.