Arc2D.PIE help

[MZA]

Hi there.

I have to construct a project that is a solid color circle with four circles inside of each other (kind of like a bulls-eye) that each have a third of the circle a different color (hence the Arc2D problem)

I'm having problems with making the inner pie pieces. I am able to construct them, but not at the angles required. Also, I'm trying to figure out how to keep them at a consistent ratio with the outer circle when I re-size the window. If someone could give me some pointers or some sample code I would be eternally grateful.

Thanks,

MZA

[Fubarable]

First you show us yours (code that is). :)

[MZA]

:D

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Arc2D;
import javax.swing.JComponent;
import javax.swing.JFrame;

public class prog2
{
   public static void main(String[] args)
   {
      JFrame frame = new JFrame();
      frame.setSize(360, 360);
      frame.setTitle("Prog2");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      GraphicComponent component = new GraphicComponent();
      frame.add(component);

      frame.setVisible(true);
   }
}

class GraphicComponent extends JComponent
{
   public void paintComponent(Graphics g)
   {
     // Recover Graphics2D
      Graphics2D g2 = (Graphics2D) g;
      Ellipse2D.Double elli;
      Arc2D.Double arc;

      int h=getHeight();    //h is height of component
      int w=getWidth();     //w is width of component

      Ellipse2D.Double circ1 = new Ellipse2D.Double(16, 16, w*9/10, h*9/10);
      g2.setColor(Color.ORANGE);
      g2.fill(circ1);

      Arc2D.Double arc1 = new Arc2D.Double(64, 64, w*3/5, h*3/5, 360, 480, Arc2D.PIE);
      g2.setColor(Color.GREEN);
      g2.fill(arc1);

      Arc2D.Double arc2 = new Arc2D.Double(64, 64, w*3/5, h*3/5, 240, 120, Arc2D.PIE);
      g2.setColor(Color.RED);
      g2.fill(arc2);

      Arc2D.Double arc3 = new Arc2D.Double(64, 64, w*3/5, h*3/5, 0, 120, Arc2D.PIE);
      g2.setColor(Color.BLUE);
      g2.fill(arc3);
   }

thanks for responding, this is a pain in the arse :p. I'm a complete noob when it comes to this stuff.

[Fubarable]

Myself, I'd use a 2D array of arcs, the outer index for the circles, the inner index for the arcs, and perhaps a parallel array (sorry!) of Colors. I also wouldn't hard-code the x, y, w, h of the arcs but would calculate them based on the width and height of the component displaying the arcs. You could do the calculations within a ComponentListener's componentResize() method.

for instance,

declarations...

   private static final int CIRCLE_COUNT = 4;
   private static final int ARC_COUNT = 3;

   private Arc2D[][] arcs = new Arc2D[CIRCLE_COUNT][ARC_COUNT];
   private Color[][] colors = new Color[CIRCLE_COUNT][ARC_COUNT];

the component listener...

      mainPanel.addComponentListener(new ComponentAdapter() {
         public void componentResized(ComponentEvent e) {
            
            int width = mainPanel.getWidth();
            int height = mainPanel.getHeight();
            for (int i = 0; i < CIRCLE_COUNT; i++) {
               double x = //... add code here
               double y = //... add code here
               double w = width - 2*x;
               double h = height - 2*y;

               for (int j = 0; j < ARC_COUNT; j++) {
                  double start = (double)j * 360 / ARC_COUNT;
                  double extent = //... add code here
                  Arc2D arc = new Arc2D.Double(x, y, w, h, start, extent, Arc2D.PIE);
                  arcs[i][j] = arc;
               }
               
            }
            mainPanel.repaint();
         }
      });

and in the paintComponent

      Graphics2D g2 = (Graphics2D)g;
      g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
      for (int i = 0; i < arcs.length; i++) {
         for (int j = 0; j < arcs[i].length; j++) {
            if (arcs[i][j] != null) {
               g2.setColor(colors[i][j]);
               g2.fill(arcs[i][j]);
            }
         }
      }

[MZA]

Thanks a ton for the input, it helped me solve my problem. Glad to find a place where I can get help even on basic stuff :D.