using System;
using System.Drawing;
using System.Windows.Forms;
class PieChart: Form
{
int[] aiValues = { 50, 100, 25, 150, 100, 75 };
public static void Main()
{
Application.Run(new PieChart());
}
public PieChart()
{
ResizeRedraw = true;
}
protected override void OnPaint(PaintEventArgs pea)
{
DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
}
protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
{
Rectangle rect = new Rectangle(50, 50, 200, 200);
Pen pen = new Pen(clr);
int iTotal = 0;
float fAngle = 0, fSweep;
foreach(int iValue in aiValues)
iTotal += iValue;
foreach(int iValue in aiValues)
{
fSweep = 360f * iValue / iTotal;
DrawPieSlice(grfx, pen, rect, fAngle, fSweep);
fAngle += fSweep;
}
}
protected virtual void DrawPieSlice(Graphics grfx, Pen pen,
Rectangle rect,
float fAngle, float fSweep)
{
float fSlice = (float)(2 * Math.PI * (fAngle + fSweep / 2) / 360);
rect.Offset((int)(rect.Width / 10 * Math.Cos(fSlice)),
(int)(rect.Height / 10 * Math.Sin(fSlice)));
grfx.DrawPie(pen, rect, fAngle, fSweep);
}
}
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