绘制饼形统计图

struct PieInfo

{

public Color Color;

public uint Number;

public PieInfo(Color AColor, uint ANumber)

{

Color = AColor;

Number = ANumber;

}

}

///<summary>

///绘制饼形统计图

///</summary>

///<param name="AGraphics">绘制的画板</param>

///<param name="ARect">圆形的大小</param>

///<param name="APies">每个颜色所占数量</param>

private void DrawPies(Graphics AGraphics, Rectangle ARect, params PieInfo[] APies)

{

if (AGraphics == null) return;

uint vSum = 0;

foreach (PieInfo vPieInfo in APies)

vSum += vPieInfo.Number;

float vAngle = 0;

foreach (PieInfo vPieInfo in APies)

{

if (vPieInfo.Number == 0) continue;

float vAngleOffset = ((float)vPieInfo.Number / vSum) * 360;

AGraphics.FillPie(new SolidBrush(vPieInfo.Color),

ARect, vAngle, vAngleOffset);

vAngle += vAngleOffset;

}

}

private void button1_Click(object sender, EventArgs e)

{

//如红允占%,绿色占%,黄色占%,黑色占%

Graphics vGraphics = CreateGraphics();

DrawPies(vGraphics, new Rectangle(0, 0, 200, 200),

new PieInfo(Color.Red, 30),

new PieInfo(Color.Green, 35),

new PieInfo(Color.Yellow, 20),

new PieInfo(Color.Black, 15));

vGraphics.Dispose();

}