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C# 饼图,其实很简单的一个东西,我发上来是因为我要实现的一个功能,网络上面的什么控件什么的都不可以做到,
在网上搜了将近一天的时间,我晕晕的，但是结果确实失落的，一气之下,自己画了一个,也就花了三个小时,希望能够
给需要的朋友带来帮助,少走一点弯路,知识在于共享,大家共同进步,好了,不废话了，代码如下,什么都不需要安装，
直接用就可以了，C#.Net 2005环境,XP操作系统，需要连数据库动态显示的朋友，只要改变传进去的DataTable就可以了
上面没有什么备注,我认为很简单的东西，所以也就忽略了，我相信大家只要用心看，应该很简单
首先创建一个aspx文件,张贴以下代码就可以了，注意红色部分改成你自己的档名就可以了
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
public partial class Test_Chart : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
// 在此处放置用户代码以初始化页面
MemoryStream stream = new MemoryStream();
MemoryStream columnarStream = new MemoryStream();
Bitmap graph = null;
DataTable dt = new DataTable();
dt.Columns.Add("Ven", typeof(System.String));
dt.Columns.Add("BadQty", typeof(System.Int32));
dt.Rows.Add("山东威海", 65);
dt.Rows.Add("安徽黄山",23);
dt.Rows.Add("江苏太湖",34);
dt.Rows.Add("陕西华山",98);
dt.Rows.Add("湖南景刚山",102);
dt.Rows.Add("海南南海",74);
graph = GetPieGraph("Compex各组别不合格率统计",600,500,100,30,dt);
graph.Save(stream, ImageFormat.Jpeg);
//图片输出
Response.Clear();
Response.ContentType = "image/jpeg";
Response.BinaryWrite(stream.ToArray());
}
protected Bitmap GetPieGraph(string title, int width, int height, int left, int top, DataTable gdt)
{
Bitmap objbitmap = new Bitmap(width, height);
Graphics objgraphics;
objgraphics = Graphics.FromImage(objbitmap);
objgraphics.Clear(Color.White);
StringFormat drawformat = new System.Drawing.StringFormat(StringFormatFlags.DirectionVertical);
StringFormat drawformat1 = new System.Drawing.StringFormat(StringFormatFlags.DisplayFormatControl);
objgraphics.DrawString(title, new Font("宋体", 16),Brushes.Black, 150, 5, drawformat1);
PointF symbolleg = new PointF(left, height-top-45);
PointF descleg = new PointF(left + 20, height - top - 45);
//画边框
objgraphics.DrawRectangle(Pens.Black, 0, 0, width-1, height-1);
//画内小框
int h = gdt.Rows.Count / 4;
if (gdt.Rows.Count % 4 > 0)
{
h = h + 1;
}
objgraphics.DrawRectangle(Pens.Black, left-10, height-top-50,gdt.Rows.Count*70+10,20*h);
//显示什么颜色代表什么的
for (int i = 0; i < gdt.Rows.Count; i++)
{
if (i >= 4 && (i+1)%4==1)
{
symbolleg.Y += 20;
descleg.Y += 20;
symbolleg.X = left;
descleg.X = left + 20;
}
objgraphics.FillRectangle(new SolidBrush(getcolor(i)), symbolleg.X, symbolleg.Y, 12, 10);
objgraphics.DrawRectangle(Pens.Black, symbolleg.X, symbolleg.Y, 12, 10);
objgraphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋体", 10), Brushes.Black, descleg);
symbolleg.X += 100;
descleg.X += 100;
}
float sglcurrentangle = 0;
float sgltotalangle = 0;
float sgltotalvalues = 0;
for (int i = 0; i < gdt.Rows.Count; i++)
{
sgltotalvalues += float.Parse(gdt.Rows[i][1].ToString().Trim());
}
for (int i = 0; i < gdt.Rows.Count; i++)
{
sglcurrentangle = float.Parse(gdt.Rows[i][1].ToString().Trim()) / sgltotalvalues * 360;
objgraphics.FillPie(new SolidBrush(getcolor(i)), left+50, top+30, 300, 300, sgltotalangle, sglcurrentangle);
objgraphics.DrawPie(Pens.Black, left + 50, top + 30,300, 300, sgltotalangle, sglcurrentangle);
//半径 r
double r = 300 / 2;
//圆心位置：
double cX = left + 50 + r;
double cY = top + 30 + r;
//圆上点的坐标：
double dX = r * Math.Cos((360 - sgltotalangle - sglcurrentangle / 2) * 3.14 / 180);
double dY = r * Math.Sin((360 - sgltotalangle - sglcurrentangle / 2) * 3.14 / 180);
//圆上位置:
double dcX = cX + dX;
double dcY = cY - dY;
//半径 r
double r1 = 350 / 2;
//圆心位置：
double cX1 = left + 50 + r;
double cY1 = top + 30 + r;
//圆上点的坐标：
double dX1 = r1 * Math.Cos((360 - sgltotalangle - sglcurrentangle / 2) * 3.14 / 180);
double dY1 = r1 * Math.Sin((360 - sgltotalangle - sglcurrentangle / 2) * 3.14 / 180);
//圆上位置:
double dcX1 = cX1 + dX1;
double dcY1 = cY1 - dY1;
objgraphics.DrawLine(Pens.Black,Convert.ToInt32(dcX) ,Convert.ToInt32(dcY),Convert.ToInt32(dcX1), Convert.ToInt32(dcY1));
if (dX1 >= 0 && dY1 >= 0)
{
objgraphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋体", 10), Brushes.Black, Convert.ToInt32(dcX1), Convert.ToInt32(dcY1 - 5));
}
if (dX1 <= 0 && dY1 >= 0)
{
objgraphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋体", 10), Brushes.Black, Convert.ToInt32(dcX1 - 25), Convert.ToInt32(dcY1 - 15));
}
if (dX1 <= 0 && dY1 <= 0)
{
objgraphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋体", 10), Brushes.Black, Convert.ToInt32(dcX1 - 30), Convert.ToInt32(dcY1));
}
if (dX1 >= 0 && dY1 <= 0)
{
objgraphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋体", 10), Brushes.Black, Convert.ToInt32(dcX1), Convert.ToInt32(dcY1));
}
//GetLet(left + 50+150, top + 30+150,300,sgltotalangle, sglcurrentangle,arrvalues[i].ToString());
sgltotalangle += sglcurrentangle;
}
return objbitmap;
}
protected void GetLet(int startX, int startY, double dia, double totalAngle, double currentAngle, string leg)
{
double x = 0;
double y = 0;
double r = dia / 2;
x = r * Math.Cos((360 - totalAngle - currentAngle / 2) * 3.14 / 180);
y = r * Math.Sin((360 - totalAngle - currentAngle / 2) * 3.14 / 180);
}
protected Color getcolor(int itemindex)
{
Color objcolor;
if (itemindex >= 14)
{
itemindex = itemindex % 14;
}
if (itemindex == 0)
{
objcolor = Color.DarkMagenta;
}
else if (itemindex == 1)
{
objcolor = Color.MediumAquamarine;
}
else if (itemindex == 2)
{
objcolor = Color.DeepSkyBlue;
}
else if (itemindex == 3)
{
objcolor = Color.DarkRed;
}
else if (itemindex == 4)
{
objcolor = Color.Pink;
}
else if (itemindex == 5)
{
objcolor = Color.Salmon;
}
else if (itemindex == 6)
{
objcolor = Color.Khaki;
}
else if (itemindex == 7)
{
objcolor = Color.Maroon;
}
else if (itemindex == 8)
{
objcolor = Color.LawnGreen;
}
else if (itemindex == 9)
{
objcolor = Color.LightGoldenrodYellow;
}
else if (itemindex == 10)
{
objcolor = Color.Moccasin;
}
else if (itemindex == 11)
{
objcolor = Color.YellowGreen;
}
else if (itemindex == 12)
{
objcolor = Color.DarkCyan;
}
else if (itemindex == 13)
{
objcolor = Color.SteelBlue;
}
else if (itemindex == 14)
{
objcolor = Color.Tomato;
}
else
{
objcolor = Color.SlateGray;
}
return objcolor;
}
}