show Rainbow Colors

Tue Nov 11, 2008 6:07 pm

show Rainbow Colors

Code:: import javax.swing.*; import java.awt.event.*; import java.awt.Graphics; import java.awt.image.BufferedImage; public class ShowRainbowColors extends JComponent { BufferedImage bufferedImage; public void initialize() { int wd= getSize().width; int ht = getSize().height; int[] data = new int[wd * ht]; int index = 0; for (int j = 0; j < ht; j++) { int red = (j * 255) / (ht - 1); for (int k = 0; k < wd; k++) { int green = (k* 255) / (wd - 1); int blue = 128; data[index++] = (red << 16) | (green << 8) | blue; } } bufferedImage = new BufferedImage(wd, ht, BufferedImage. TYPE_INT_RGB); bufferedImage.setRGB(0, 0, wd, ht, data, 0, wd); } public void paint(Graphics g) { if (bufferedImage == null) initialize(); g.drawImage(bufferedImage, 0, 0, this); } public static void main(String[] args) { JFrame frame = new JFrame("Show Rainbow Colors"); frame.getContentPane().add(new ShowRainbowColors()); frame.setSize(450, 300); frame.setLocation(100, 100); frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent event) { System.exit(0); } }); frame.setVisible(true); } }

Output will be displayed as: