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    C# 使用GDI绘制雷达图的实例

    栏目:代码类 时间:2019-11-22 15:07

    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:

    public static class RadarDemo
      {
        static float mW = 1200;
        static float mH = 1200;
        static Dictionary<string, float> mData = new Dictionary<string, float>
        {
            //{ "速度",77},
            { "力量", 72},
            { "防守", 110},
            { "射门", 50},
            { "传球", 80},
            { "耐力", 60 }
        };//维度数据
        static float mCount = mData.Count; //边数
        static float mCenter = mW * 0.5f; //中心点
        static float mRadius = mCenter - 100; //半径(减去的值用于给绘制的文本留空间)
        static double mAngle = (Math.PI * 2) / mCount; //角度
        static Graphics graphics = null;
        static int mPointRadius = 5; // 各个维度分值圆点的半径  
        static int textFontSize = 18;  //顶点文字大小 px
        const string textFontFamily = "Microsoft Yahei"; //顶点字体
        static Color lineColor = Color.Green;
        static Color fillColor = Color.FromArgb(128, 255, 0, 0);
        static Color fontColor = Color.Black;
        public static void Show()
        {
          Bitmap img = new Bitmap((int)mW, (int)mH); 
          graphics = Graphics.FromImage(img); 
          graphics.Clear(Color.White);
          img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/0.png", ImageFormat.Png);
          DrawPolygon(graphics);
          img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/1.png", ImageFormat.Png);
          DrawLines(graphics);
          img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/2.png", ImageFormat.Png);
          DrawText(graphics);
          img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/3.png", ImageFormat.Png);
          DrawRegion(graphics);
          img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/4.png", ImageFormat.Png);
          DrawCircle(graphics);
          img.Save($"{AppDomain.CurrentDomain.BaseDirectory}radar/5.png", ImageFormat.Png);
          img.Dispose();
          graphics.Dispose();
        }
        // 绘制多边形边
        private static void DrawPolygon(Graphics ctx)
        {
          var r = mRadius / mCount; //单位半径
          Pen pen = new Pen(lineColor);
          //画6个圈
          for (var i = 0; i < mCount; i++)
          {
            var points = new List<PointF>();
            var currR = r * (i + 1); //当前半径
            //画6条边
            for (var j = 0; j < mCount; j++)
            {
              var x = (float)(mCenter + currR * Math.Cos(mAngle * j));
              var y = (float)(mCenter + currR * Math.Sin(mAngle * j));
              points.Add(new PointF { X = x, Y = y });
            }
            ctx.DrawPolygon(pen, points.ToArray());
            //break;
          }
          ctx.Save();
        }
        //顶点连线
        private static void DrawLines(Graphics ctx)
        {
          for (var i = 0; i < mCount; i++)
          {
            var x = (float)(mCenter + mRadius * Math.Cos(mAngle * i));
            var y = (float)(mCenter + mRadius * Math.Sin(mAngle * i));
            ctx.DrawLine(new Pen(lineColor), new PointF { X = mCenter, Y = mCenter }, new PointF { X = x, Y = y });
            //break;
          }
          ctx.Save();
        }
        //绘制文本
        private static void DrawText(Graphics ctx)
        {
          var fontSize = textFontSize;//mCenter / 12;
          Font font = new Font(textFontFamily, fontSize, FontStyle.Regular);
          int i = 0;
          foreach (var item in mData)
          {
            var x = (float)(mCenter + mRadius * Math.Cos(mAngle * i));
            var y = (float)(mCenter + mRadius * Math.Sin(mAngle * i) - fontSize);
            if (mAngle * i > 0 && mAngle * i <= Math.PI / 2)
            {
              ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x - ctx.MeasureString(item.Key, font).Width * 0.5f, y + fontSize/* y + fontSize*/);
            }
            else if (mAngle * i > Math.PI / 2 && mAngle * i <= Math.PI)
            {
              ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x - ctx.MeasureString(item.Key, font).Width, y /*y + fontSize*/);
            }
            else if (mAngle * i > Math.PI && mAngle * i <= Math.PI * 3 / 2)
            {
              ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x - ctx.MeasureString(item.Key, font).Width, y);
            }
            else if (mAngle * i > Math.PI * 3 / 2)
            {
              ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x - ctx.MeasureString(item.Key, font).Width * 0.5f, y - fontSize * 0.5f);
            }
            else
            {
              ctx.DrawString(item.Key, font, new SolidBrush(fontColor), x, y /* y + fontSize*/);
            }
            i++;
          }
          ctx.Save();
        }
        //绘制数据区域
        private static void DrawRegion(Graphics ctx)
        {
          int i = 0;
          List<PointF> points = new List<PointF>();
          foreach (var item in mData)
          {
            var x = (float)(mCenter + mRadius * Math.Cos(mAngle * i) * item.Value / 100);
            var y = (float)(mCenter + mRadius * Math.Sin(mAngle * i) * item.Value / 100);
            points.Add(new PointF { X = x, Y = y });
            //ctx.DrawArc(new Pen(lineColor), x, y, r, r, 0, (float)Math.PI * 2); 
            i++;
          }
          //GraphicsPath path = new GraphicsPath();
          //path.AddLines(points.ToArray());
          ctx.FillPolygon(new SolidBrush(fillColor), points.ToArray());
          ctx.Save();
        }
        //画点
        private static void DrawCircle(Graphics ctx)
        {
          //var r = mCenter / 18;
          var r = mPointRadius;
          int i = 0;
          foreach (var item in mData)
          {
            var x = (float)(mCenter + mRadius * Math.Cos(mAngle * i) * item.Value / 100);
            var y = (float)(mCenter + mRadius * Math.Sin(mAngle * i) * item.Value / 100);
            ctx.FillPie(new SolidBrush(fillColor), x - r, y - r, r * 2, r * 2, 0, 360);
            //ctx.DrawArc(new Pen(lineColor), x, y, r, r, 0, (float)Math.PI * 2); 
            i++;
          }
          ctx.Save();
        }
      }