import java.awt.*;

public class AnimatedColor {
    public static void main(String[] args) {
	DrawingPanel p = new DrawingPanel(300, 300);
	Graphics g = p.getGraphics();
	// This is a forever loop
	// If you do this in your animations you won't be able
	// to save them as an image
	for(;;) {
	    // Animate from white to green
	    for (int i = 255; i > 0; i-=5) {
		drawCircle(p, g, i);
	    }
	    // Animate from green to whtie
	    for (int i = 0; i < 255; i+=5) {
		drawCircle(p, g, i);
	    }
	}
    }

    // Erases the canvas
    // Draws a circle at 100, 100 of size 100 and color shade, 255, shade
    // Sleeps the panel for 1/20 of a second
    public static void drawCircle(DrawingPanel p, Graphics g, int shade) {
	g.setColor(Color.WHITE);
	g.drawRect(0, 0, 300, 300);
	g.setColor(new Color(shade, 255, shade));
	g.fillOval(100, 100, 100, 100);
	p.sleep(50);
    }
}