C# 饼图实现(手工画的)

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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 Sy***m.Collections;
using Sy***m.ComponentModel;
using Sy***m.Data;
using Sy***m.Drawing;
using Sy***m.Web;
using Sy***m.Web.UI;
using Sy***m.Web.UI.WebControls;
using Sy***m.Web.UI.HtmlControls;
using Sy***m.Drawing.Drawing2D;
using Sy***m.Drawing.Imaging;
using Sy***m.IO;

public partial class Test_Chart : Sy***m.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***lumns.Add("Ven", typeof(Sy***m.String));
        dt***lumns.Add("BadQty", typeof(Sy***m.Int32));
        dt***ws.Add("山东威海", 65);
        dt***ws.Add("安徽黄山",23);
        dt***ws.Add("江苏太湖",34);
        dt***ws.Add("陕西华山",98);
        dt***ws.Add("湖南景刚山",102);
        dt***ws.Add("海南南海",74);
        graph = GetPieGraph("Compex各组别不合格率统计",600,500,100,30,dt);
        gr***.Save(stream, Im***Format.Jpeg);
        //图片输出
        Re***nse.Clear();
        Re***nse.ContentType = "image/jpeg";
        Re***nse.BinaryWrite(st***m.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 = Gr***ics.FromImage(objbitmap);
        ob***aphics.Clear(Co***.White);
        StringFormat drawformat = new Sy***m.Drawing.StringFormat(St***gFormatFlags.DirectionVertical);
        StringFormat drawformat1 = new Sy***m.Drawing.StringFormat(St***gFormatFlags.DisplayFormatControl);
        ob***aphics.DrawString(title, new Font("宋体", 16),Br***es.Black, 150, 5, drawformat1);
        PointF symbolleg = new PointF(left, height-top-45);
        PointF descleg = new PointF(left + 20, height - top - 45);
        //画边框
        ob***aphics.DrawRectangle(Pe***Black, 0, 0, width-1, height-1);
        //画内小框
        int h = gd***ows.Count / 4;
        if (gd***ows.Count % 4 > 0)
        {
            h = h + 1;
        }
        ob***aphics.DrawRectangle(Pe***Black, left-10, height-top-50,gd***ows.Count*70+10,20*h);
        //显示什么颜色代表什么的
        for (int i = 0; i < gd***ows.Count; i++)
        {
            if (i >= 4 && (i+1)%4==1)
            {
                sy***lleg.Y += 20;
                de***eg.Y += 20;
                sy***lleg.X = left;
                de***eg.X = left + 20;
            }

            ob***aphics.FillRectangle(new SolidBrush(getcolor(i)), sy***lleg.X, sy***lleg.Y, 12, 10);
            ob***aphics.DrawRectangle(Pe***Black, sy***lleg.X, sy***lleg.Y, 12, 10);
            ob***aphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋体", 10), Br***es.Black, descleg);
            sy***lleg.X += 100;
            de***eg.X += 100;
        }

        float sglcurrentangle = 0;
        float sgltotalangle = 0;
        float sgltotalvalues = 0;
        for (int i = 0; i < gd***ows.Count; i++)
        {
            sgltotalvalues += fl***.Parse(gdt.Rows[i][1].ToString().Trim());
        }
        for (int i = 0; i < gd***ows.Count; i++)
        {
            sglcurrentangle = fl***.Parse(gdt.Rows[i][1].ToString().Trim()) / sgltotalvalues * 360;
            ob***aphics.FillPie(new SolidBrush(getcolor(i)), left+50, top+30, 300, 300, sgltotalangle, sglcurrentangle);
            ob***aphics.DrawPie(Pe***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;

           
            ob***aphics.DrawLine(Pe***Black,Co***rt.ToInt32(dcX) ,Co***rt.ToInt32(dcY),Co***rt.ToInt32(dcX1), Co***rt.ToInt32(dcY1));
            if (dX1 >= 0 && dY1 >= 0)
            {
                ob***aphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋体", 10), Br***es.Black, Co***rt.ToInt32(dcX1), Co***rt.ToInt32(dcY1 - 5));
            }
            if (dX1 <= 0 && dY1 >= 0)
            {
                ob***aphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋体", 10), Br***es.Black, Co***rt.ToInt32(dcX1 - 25), Co***rt.ToInt32(dcY1 - 15));
            }
            if (dX1 <= 0 && dY1 <= 0)
            {
                ob***aphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋体", 10), Br***es.Black, Co***rt.ToInt32(dcX1 - 30), Co***rt.ToInt32(dcY1));
            }
            if (dX1 >= 0 && dY1 <= 0)
            {
                ob***aphics.DrawString(gdt.Rows[i][0].ToString().Trim(), new Font("宋体", 10), Br***es.Black, Co***rt.ToInt32(dcX1), Co***rt.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 = Co***.DarkMagenta;
        }
        else if (itemindex == 1)
        {
            objcolor = Co***.MediumAquamarine;
        }
        else if (itemindex == 2)
        {
            objcolor = Co***.DeepSkyBlue;
        }
        else if (itemindex == 3)
        {
            objcolor = Co***.DarkRed;
        }
        else if (itemindex == 4)
        {
            objcolor = Co***.Pink;
        }
        else if (itemindex == 5)
        {
            objcolor = Co***.Salmon;
        }
        else if (itemindex == 6)
        {
            objcolor = Co***.Khaki;
        }
        else if (itemindex == 7)
        {
            objcolor = Co***.Maroon;
        }
        else if (itemindex == 8)
        {
            objcolor = Co***.LawnGreen;
        }
        else if (itemindex == 9)
        {
            objcolor = Co***.LightGoldenrodYellow;
        }
        else if (itemindex == 10)
        {
            objcolor = Co***.Moccasin;
        }
        else if (itemindex == 11)
        {
            objcolor = Co***.YellowGreen;
        }
        else if (itemindex == 12)
        {
            objcolor = Co***.DarkCyan;
        }
        else if (itemindex == 13)
        {
            objcolor = Co***.SteelBlue;
        }
        else if (itemindex == 14)
        {
            objcolor = Co***.Tomato;
        }
        else
        {
            objcolor = Co***.SlateGray;
        }
        return objcolor;
    }

}