Concentric Circles---I need some help on this one...

Question

I'm trying to figure out how to change the color of my concentric rings. Here is my code:
import java.applet.*;
import java.awt.*;
public class SvnRings extends Applet {
public void paint(Graphics g) {
int RectLeft, RectTop, RectHeight, RectWidth;
int AppletHeight = this.getSize().height;
int AppletWidth = this.getSize().width;
for (int i=8; i >= 0; i--) {
if ((i % 2) == 0) g.setColor(Color.red);
else g.setColor(Color.white);
RectHeight = AppletHeight*i/8;
RectWidth = AppletWidth*i/8;
RectLeft = AppletWidth/2 - i*AppletWidth/16;
RectTop = AppletHeight/2 - i*AppletHeight/16;
g.fillOval(RectLeft, RectTop, RectWidth, RectHeight);
Can anyone tell me what I am forgeting?

Answer 1

Well, what colours do you want them to be?
You could generate them randomly, based on a sequence or from an array. I'll do the latter 'cos it's easiest.
// 9 colours (for the 9 rings)
private Color[] colors = new Color[] {Color.RED, Color.ORANGE, Color.YELLOW, Color.GREEN, Color.BLUE, Color.CYAN, Color.PURPLE, Color.PINK, Color.WHITE};
for(int idx = 8; idx >= 0; idx--) {
  g.setColor(colors[idx]);
}If you want a mathematical approach then you've got to create a new color in each iteration of the loop based on the loop value.
Hope this helps.