Select Case itemIndex
Case 0
objColor = Color.Blue
Case 1
objColor = Color.Red
Case 2
objColor = Color.Yellow
Case 3
objColor = Color.Purple
Case 4
objColor = Color.Orange
Case 5
objColor = Color.Brown
Case 6
objColor = Color.Gray
Case 7
objColor = Color.Maroon
Case 8
objColor = Color.Maroon
Case Else
objColor = Color.Blue
End Select
Return objColor
End Function
End Class
好了，我们的代码已经写完，点击“全部保存”按钮，然后按“F5”执行，看看最好的结果。如果没有错误的话，您将会看到如下的结果：
![]() seover="this.style.cursor=''''hand'''';" style="CURSOR: hand" onclick=window.open(this.src); height=227 alt="" src="/Article/UploadFiles/200904/2009042310415340.gif" width=385 onload=javascript:DrawImage(this); border=0 pop="按此在新窗口打开图片">
值得说明的是，上面只是简单地示例了如何利用.NET 框架类库中的图形类创建简单的图形，但.NET 框架类库中还提供了更高级的二维和矢量图形功能，利用这些高级功能，我们可以创建出二维或矢量的图形，那时，我们的图形看起来会更加形象。
本文所有代码在简体中文Windows 2000 + .NET FrameWork 1.0（英文正式版）+ .NET FrameWork SP1和Windows XP + .NET FrameWork 1.0（中文版）下调试通过。
C#代码
using System.Drawing;
using System.Drawing.Imaging;
public class Chart : System.Web.UI.Page
{
[System.Diagnostics.DebuggerStepThrough()]
private void InitializeComponent()
{
}
private void Page_Init(object sender, System.EventArgs e)
{
InitializeComponent();
}
private void Page_Load(object sender, System.EventArgs e)
{
int i;
Bitmap objBitMap = new Bitmap(400, 200);
Graphics objGraphics;
objGraphics = Graphics.FromImage(objBitMap);
objGraphics.Clear(Color.White);
int[5] arrValues;
arrValues(0) = 100;
arrValues(1) = 135;
arrValues(2) = 115;
arrValues(3) = 125;
arrValues(4) = 75;
arrValues(5) = 120;
string[5] arrValueNames;
arrValueNames(0) = "一月";
arrValueNames(1) = "二月";
arrValueNames(2) = "三月";
arrValueNames(3) = "四月";
arrValueNames(4) = "五月";
arrValueNames(5) = "六月";
objGraphics.DrawString(" X 公司上半年销售情况", new Font("宋体", 16), Brushes.Black, new PointF(5, 5));
PointF symbolLeg = new PointF(335, 20);
PointF descLeg = new PointF(360, 16);
for (int i = 0; i <= arrValueNames.Length - 1; i++) {
objGraphics.FillRectangle(new SolidBrush(GetColor(i)), symbolLeg.X, symbolLeg.Y, 20, 10);
objGraphics.DrawRectangle(Pens.Black, symbolLeg.X, symbolLeg.Y, 20, 10);
objGraphics.DrawString(arrValueNames(i).ToString, new Font("宋体", 10), Brushes.Black, descLeg);
symbolLeg.Y += 15;
descLeg.Y += 15;
}
for (int i = 0; i <= arrValues.Length - 1; i++) {
objGraphics.FillRectangle(new SolidBrush(GetColor(i)), (i * 35) + 15, 200 - arrValues(i), 20, arrValues(i) + 5);
objGraphics.DrawRectangle(Pens.Black, (i * 35) + 15, 200 - arrValues(i), 20, arrValues(i) + 5);
}
float sglCurrentAngle = 0;
float sglTotalAngle = 0;
float sglTotalValues = 0;
for (int i = 0; i <= arrValues.Length - 1; i++) {
sglTotalValues += arrValues(i);
}
i = 0;
for (int i = 0; i <= arrValues.Length - 1; i++) {
sglCurrentAngle = arrValues(i) / sglTotalValues * 360;
objGraphics.FillPie(new SolidBrush(GetColor(i)), 220, 95, 100, 100, sglTotalAngle, sglCurrentAngle);
objGraphics.DrawPie(Pens.Black, 220, 95, 100, 100, sglTotalAngle, sglCurrentAngle);
sglTotalAngle += sglCurrentAngle;
}
objBitMap.Save(Response.OutputStream, ImageFormat.Gif);
}
private Color GetColor(int itemIndex)
{
Color objColor;
if (itemIndex == 0) {
objColor = Color.Blue;
} else if (itemIndex == 1) {
objColor = Color.Red;
} else if (itemIndex == 2) {
objColor = Color.Yellow;
} else if (itemIndex == 3) {
objColor = Color.Purple;
} else if (itemIndex == 4) {
objColor = Color.Orange;
} else if (itemIndex == 5) {
objColor = Color.Brown;
} else if (itemIndex == 6) {
objColor = Color.Gray;
} else if (itemIndex == 7) {
objColor = Color.Maroon;
} else if (itemIndex == 8) {
objColor = Color.Maroon;
} else {
objColor = Color.Blue;
}
return objColor;
}
}
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