本文实例讲述了asp.net中生成饼状与柱状图的实现方法。分享给大家供大家参考。具体方法如下：
一、生成图形的公共方法：
using System.Collections.Generic;
using System.Text;
//
//using System.Data;
//using System.Web.UI.WebControls;
//
using System.Drawing;
using System.Drawing.Imaging;
namespace Tools
{
public static class OWCImageHelp
{
/// <summary>
/// 动态的生成柱状图和饼状图
/// </summary>
/// <param name="arrValueNames">行坐标要显示的字段</param>
/// <param name="arrValues">纵坐标要显示的数字</param>
/// <param name="title">标题</param>
public static void GetZBImage(string[] arrValueNames, int[] arrValues, string title)
{
Bitmap objBitMap = new Bitmap(650, 300);
Graphics objGraphics;
objGraphics = Graphics.FromImage(objBitMap);
objGraphics.Clear(Color.White);
//int[] arrValues = { 40000, 32000, 24000, 30000, 36000, 28000 };
//string[] arrValueNames = new string[] { "第一次", "第二次", "第三次", "第四次", "第五次", "第六次" };
objGraphics.DrawString(title, new System.Drawing.Font("宋体", 16), Brushes.Blue, new PointF(5, 5));
PointF symbolLeg = new PointF(335, 20);
PointF descLeg = new PointF(360, 16);
//画出说明部分的图形
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 System.Drawing.Font("宋体", 10), Brushes.Black, descLeg);
symbolLeg.Y += 15;
descLeg.Y += 15;
}
float TotalValues = 0;
for (int i = 0; i <= arrValues.Length - 1; i++)
{
TotalValues += arrValues[i];
}
//绘出矩形图。
float Rectangleheight = 0;
PointF recLeg = new PointF(12, 200 - arrValues[0] / TotalValues * 300);
for (int i = 0; i < arrValues.Length; i++)
{
Rectangleheight = arrValues[i] / TotalValues * 300;
objGraphics.FillRectangle(new SolidBrush(GetColor(i)), (i * 35) + 15, 200 - Rectangleheight, 20, Rectangleheight + 50);
objGraphics.DrawRectangle(Pens.Black, (i * 35) + 15, 200 - Rectangleheight, 20, Rectangleheight + 50);
recLeg.Y = 200 - Rectangleheight - 14;
objGraphics.DrawString(arrValues[i].ToString(), new System.Drawing.Font("宋体", 10), Brushes.Blue, recLeg);
recLeg.X += 35;
}
//绘出圆形图。
float sglCurrentAngle = 0;
float sglTotalAngle = 0;
for (int i = 0; i < arrValues.Length; i++)
{
sglCurrentAngle = arrValues[i] / TotalValues * 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(System.Web.HttpContext.Current.Response.OutputStream, ImageFormat.Gif);
}
//定义颜色。
private static Color GetColor(int itemIndex)
{
Color objColor;
if (itemIndex == 0)
{
objColor = Color.Maroon;