最近项目要用C#实现画一个雷达图，搜了搜网上竟然找不到C#画雷达图的解决方案，那么自己实现一个吧
实现效果如下图：
代码如下：
1 public static class RadarDemo 2 { 3 static float mW = 1200; 4 static float mH = 1200; 5 static Dictionary<string, float> mData = new Dictionary<string, float> 6 { 7 //{ "速度",77}, 8 { "力量", 72}, 9 { "防守", 110}, 10 { "射门", 50}, 11 { "传球", 80}, 12 { "耐力", 60 } 13 };//维度数据 14 static float mCount = mData.Count; //边数 15 static float mCenter = mW * 0.5f; //中心点 16 static float mRadius = mCenter - 100; //半径(减去的值用于给绘制的文本留空间) 17 static double mAngle = (Math.PI * 2) / mCount; //角度 18 static Graphics graphics = null; 19 static int mPointRadius = 5; // 各个维度分值圆点的半径 20 static int textFontSize = 18; //顶点文字大小 px 21 const string textFontFamily = "Microsoft Yahei"; //顶点字体 22 static Color lineColor = Color.Green; 23 static Color fillColor = Color.FromArgb(128, 255, 0, 0); 24 static Color fontColor = Color.Black; 25 26 public static void Show() 27 { 28 Bitmap img = new Bitmap((int)mW, (int)mH); 29 graphics = Graphics.FromImage(img); 30 graphics.Clear(Color.White); 31 img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/0.png", ImageFormat.Png); 32 DrawPolygon(graphics); 33 img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/1.png", ImageFormat.Png); 34 DrawLines(graphics); 35 img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/2.png", ImageFormat.Png); 36 DrawText(graphics); 37 img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/3.png", ImageFormat.Png); 38 DrawRegion(graphics); 39 img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/4.png", ImageFormat.Png); 40 DrawCircle(graphics); 41 img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/5.png", ImageFormat.Png); 42 img.Dispose(); 43 graphics.Dispose(); 44 45 } 46 47 48 // 绘制多边形边 49 private static void DrawPolygon(Graphics ctx) 50 { 51 var r = mRadius / mCount; //单位半径 52 Pen pen = new Pen(lineColor); 53 //画6个圈 54 for (var i = 0; i < mCount; i++) 55 { 56 var points = new List<PointF>(); 57 var currR = r * (i + 1); //当前半径 58 //画6条边 59 for (var j = 0; j < mCount; j++) 60 { 61 var x = (float)(mCenter + currR * Math.Cos(mAngle * j)); 62 var y = (float)(mCenter + currR * Math.Sin(mAngle * j)); 63 points.Add(new PointF { X = x, Y = y }); 64 } 65 ctx.DrawPolygon(pen, points.ToArray()); 66 //break; 67 } 68 69 ctx.Save(); 70 } 71 72 //顶点连线 73 private static void DrawLines(Graphics ctx) 74 { 75 for (var i = 0; i < mCount; i++) 76 { 77 var x = (float)(mCenter + mRadius * Math.Cos(mAngle * i)); 78 var y = (float)(mCenter + mRadius * Math.Sin(mAngle * i)); 79 ctx.DrawLine(new Pen(lineColor), new PointF { X = mCenter, Y = mCenter }, new PointF { X = x, Y = y }); 80 //break; 81 } 82 ctx.Save(); 83 } 84 85 //绘制文本 86 private static void DrawText(Graphics ctx) 87 { 88 var fontSize = textFontSize;//mCenter / 12; 89 Font font = new Font(textFontFamily, fontSize, FontStyle.Regular); 90 91 int i = 0; 92 foreach (var item in mData) 93 { 94 var x = (float)(mCenter + mRadius * Math.Cos(mAngle * i)); 95 var y = (float)(mCenter + mRadius * Math.Sin(mAngle * i) - fontSize); 96 97 if (mAngle * i > 0 && mAngle * i <= Math.PI / 2) 98 { 99 ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x - ctx.MeasureString(item.Key, font).Width * 0.5f, y + fontSize/* y + fontSize*/); 100 } 101 else if (mAngle * i > Math.PI / 2 && mAngle * i <= Math.PI) 102 { 103 ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x - ctx.MeasureString(item.Key, font).Width, y /*y + fontSize*/); 104 } 105 else if (mAngle * i > Math.PI && mAngle * i <= Math.PI * 3 / 2) 106 { 107 ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x - ctx.MeasureString(item.Key, font).Width, y); 108 } 109 else if (mAngle * i > Math.PI * 3 / 2) 110 { 111 ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x - ctx.MeasureString(item.Key, font).Width * 0.5f, y - fontSize * 0.5f); 112 } 113 else 114 { 115 ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x, y /* y + fontSize*/); 116 } 117 i++; 118 } 119 ctx.Save(); 120 } 121 122 //绘制数据区域 123 private static void DrawRegion(Graphics ctx) 124 { 125 int i = 0; 126 List<PointF> points = new List<PointF>(); 127 foreach (var item in mData) 128 { 129 var x = (float)(mCenter + mRadius * Math.Cos(mAngle * i) * item.Value / 100); 130 var y = (float)(mCenter + mRadius * Math.Sin(mAngle * i) * item.Value / 100); 131 132 points.Add(new PointF { X = x, Y = y }); 133 134 //ctx.DrawArc(new Pen(lineColor), x, y, r, r, 0, (float)Math.PI * 2); 135 i++; 136 } 137 138 139 //GraphicsPath path = new GraphicsPath(); 140 //path.AddLines(points.ToArray()); 141 142 ctx.FillPolygon(new SolidBrush(fillColor), points.ToArray()); 143 144 ctx.Save(); 145 } 146 147 //画点 148 private static void DrawCircle(Graphics ctx) 149 { 150 //var r = mCenter / 18; 151 var r = mPointRadius; 152 153 int i = 0; 154 foreach (var item in mData) 155 { 156 var x = (float)(mCenter + mRadius * Math.Cos(mAngle * i) * item.Value / 100); 157 var y = (float)(mCenter + mRadius * Math.Sin(mAngle * i) * item.Value / 100); 158 ctx.FillPie(new SolidBrush(fillColor), x - r, y - r, r * 2, r * 2, 0, 360); 159 //ctx.DrawArc(new Pen(lineColor), x, y, r, r, 0, (float)Math.PI * 2); 160 i++; 161 } 162 ctx.Save(); 163 } 164 165 }
把这个类粘贴到你的项目中，执行RadarDemo.Show();就会在你的根目录里生成雷达图了，为了方便理解怎么画出来的，我把画每一个步骤时的图片都保存下来了。可以自行运行查看