Drawing stripes with Java (Swing/WritableRaster).

Stripe.java

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

import javax.swing.JFrame;
import javax.swing.JPanel;


public class Stripe {
 
    public static void main(String[] args) {
        JFrame frame = new JFrame("stripe");
        BufferedImage bi = new BufferedImage(640, 480, BufferedImage.TYPE_INT_ARGB);
        long start = System.currentTimeMillis();
        draw(bi.getRaster(), 50, 0, new int[]{255, 255, 255, 255}, new int[]{0, 0, 0, 255});
        System.out.println("eplaced: " + (System.currentTimeMillis() - start) / 1000.0f);
        
        Canvas canvas = new Canvas() {
                public void paint(Graphics g) {
                    g.setColor(new Color(0, 0, 0, 255));
                    g.fillRect(0, 0, this.getWidth(), this.getHeight());
                    g.drawImage(bi, 0, 0, null);
                }
            };

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        canvas.setPreferredSize(new Dimension(640, 480));

        frame.add(canvas);
        frame.pack();
        frame.show();
    }

    public static void draw(WritableRaster ras, int i, int o, int[] c1, int[] c2) {
        int w = ras.getWidth();
        int h = ras.getHeight();
        for (int y=0; y<h; y++) {
            for (int x=0; x<w; x++) {
                if (((x + o) / i) % 2 == 0) {
                    ras.setPixel(x, y, c1);
                } else {
                    ras.setPixel(x, y, c2);
                }
            }
        }
    }
}