help regarding pie graph

[Aayush Patel]

Can someone help me..i want to make pie graph...like graph in which will be disribute circle according to values

[Greg Harris]

i wrote a similar program in c++ last year... it was supposed to display a regular clock with an hour hand and a minute hand. i will have to send the code when i get home tonight, but here is the idea:
first draw the circle and then draw a line from the center point to a point on the circumference of the circle. i cannot remember the exact formula at the moment, but it has something to do with the (pi * radius ^2) formula.
if you do not have an answer by the time i get home then i will send you that part of my code.

[Stephanie Grasson]

Aayush,
You could try something like this:

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class PieChart extends Applet
{
    int chartValues[] = { 30, 10, 20, 15, 25 };
    Color chartColors[] = { Color.red, Color.orange, Color.blue, Color.green, Color.yellow };
    public void paint( Graphics g )
    {
        int aWidth = getWidth();    // width of applet
        int aHeight = getHeight();  // height of applet
        int diameter;               // diameter of applet
        Point center = new Point(); // center point of applet
        if(aWidth > aHeight)
        {
            diameter = aHeight;
        }
        else // aHeight >= aWidth
        {
            diameter = aWidth;
        }
        center.x = aWidth / 2;
        center.y = aHeight / 2;
        int top = center.y - ( diameter / 2 );
        int left = center.x - ( diameter / 2 );
        int angles[] = new int[chartValues.length];
        for(int i = 0; i < angles.length; i++)
        {
            angles[i] = (int)((chartValues[i] / 100.0) * 360.0);
            g.setColor( chartColors[i] );
            int start = 0;
            for( int j = 0; j < i; j++ )
            {
                start += angles[j];
            }
            g.fillArc( left, top, diameter, diameter, start, angles[i] );
        }
        g.setColor( Color.black );
        g.drawOval( left, top, diameter, diameter );
    }
}

Hope this helps.
Stephanie