Java drawing panel?

I have completed some of the code for a color wheel, but I'm confused on how to complete it? I've also commented the code to help understand. So far, it prints red, orange and yellow gradients. How do I complete this?

 import java.awt.*;

    public class ColorDrawing2 {
        public static final int CENTER = 256;
        public static final int RADIUS = 120;
        public static final int SHAPES = 32;
        public static final int SIZE = 40;
        public static void main(String[] args) {

            DrawingPanel panel = new DrawingPanel(512,512);         // create a drawing panel
            panel.setBackground(new Color(0,0,0));          // set background color (orange)
            Graphics g = panel.getGraphics();               // get graphics toolkit

            for (int i = 0; i <= SHAPES; i++) {
                                        // System.out.println("i = " + i);
                double angle = (i)*(360/SHAPES)*(Math.PI/180);      // angle
                                        // System.out.println("Angle = " + angle);
                double x = CENTER - (SIZE/2) + RADIUS*Math.cos(angle);  // x-cooordinate
                double y = CENTER - (SIZE/2) + RADIUS*Math.sin(angle);  // y-coordinate

                int red = (int) (199 + 56/SHAPES*i);            // 199 < red < 255
                                        // System.out.println("Red = " + red);
                int grn = (int) (7.97*i);               // 0   < grn < 255
                                        // System.out.println("Green = " + grn);
                int blu = 0;
                g.setColor(new Color((int) red, grn, blu));
                g.fillOval((int)x, (int)y, SIZE, SIZE);
                panel.sleep(200);                   // pause 200 msec
            }
        }
    }

Yes, seems like 6 for loops should be enough. Maybe the colors should go up to 255?