在ASP.NET中动态创建柱状图和饼图(3)
发表于:2007-06-30来源:作者:点击数:
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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
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;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.<a href="http://dev.21tx.com/dotnet/aspnet/webcontrols/" target="_blank">WebControls</a>;
using System.Web.UI.HtmlControls;
using System.Drawing.Imaging;
namespace eMeng.Exam
{
/// <summary>
/// Chart 的摘要说明。
/// </summary>
public class Chart : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
Bitmap objBitMap = new Bitmap(400, 200);
Graphics objGraphics;
objGraphics = Graphics.FromImage(objBitMap);
objGraphics.Clear(Color.White);
int[] arrValues = {100,135,115,125,75,120};
string[] arrValueNames = new string[]{"一月","二月","三月","四月","五月","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; 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; 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];
}
for (int i = 0; i < arrValues.Length; 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;
}
#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}
原文转自:http://www.ltesting.net