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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; } } 效果图发不上来,下次有空再补充 |
