// Draws a smooth color gradient from black to white.

import java.awt.*;

public class DrawColorGradient {
    public static final int RECTS = 32;
    
    public static void main(String[] args) {
        DrawingPanel panel = new DrawingPanel(256, 256);
        panel.setBackground(new Color(255, 128, 0));  // orange

        Graphics g = panel.getGraphics();

        // from black to white, top/left to bottom/right
        for (int i = 0; i < RECTS; i++) {
            int shift = i * 256 / RECTS;
            g.setColor(new Color(shift, shift, shift));
            g.fillRect(shift, shift, 20, 20);
        }
    }
}