本篇内容介绍了“C# .Net如何实现灰度图和HeatMap热力图winform”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
一、前文
上一个图是之前的效果，下一个图是改进后的效果
二、渐进颜色调色板
//创建调色板，颜色映射private ColorMap[] CreatePalette(){ ColorMap[] colorMaps = new ColorMap[256]; List<Color> newColors = new List<Color>(); //颜色集合 newColors.AddRange(GetGradientColorList(Color.Red, Color.Yellow, 64)); newColors.AddRange(GetGradientColorList(Color.Yellow, Color.Green, 64)); newColors.AddRange(GetGradientColorList(Color.Green, Color.Blue, 64)); newColors.AddRange(GetGradientColorList(Color.Blue, Color.Navy, 64)); //颜色调色板展示 Bitmap colorBitmap = new Bitmap(colorPanel.Width, colorPanel.Height); Graphics graphic = Graphics.FromImage(colorBitmap); for (int i = 0; i < 256; i++) { SolidBrush solidBrush = new SolidBrush(newColors[i]); Rectangle rectangle = new Rectangle((int)(i * 2), 0, (int)2, colorPanel.Height); graphic.FillRectangle(solidBrush, rectangle); graphic.Save(); solidBrush.Dispose(); } colorPanel.BackgroundImage = colorBitmap; // 遍历每个像素并创建一个新的颜色映射 for (int X = 0; X <= 255; X++) { colorMaps[X] = new ColorMap(); colorMaps[X].OldColor = System.Drawing.Color.FromArgb(X, X, X); colorMaps[X].NewColor = System.Drawing.Color.FromArgb(255, newColors[X]); } return colorMaps;}/// <summary>/// 获得两个颜色之间渐进颜色的集合/// </summary>/// <param name="sourceColor">起始颜色</param>/// <param name="destColor">终止颜色</param>/// <param name="count">渐进颜色的个数</param>/// <returns>返回颜色集合</returns>public static List<Color> GetGradientColorList(Color srcColor, Color desColor, int count){ List<Color> colorFactorList = new List<Color>(); int redSpan = desColor.R - srcColor.R; int greenSpan = desColor.G - srcColor.G; int blueSpan = desColor.B - srcColor.B; for (int i = 0; i < count; i++) { Color color = Color.FromArgb( srcColor.R + (int)((double)i / count * redSpan), srcColor.G + (int)((double)i / count * greenSpan), srcColor.B + (int)((double)i / count * blueSpan) ); colorFactorList.Add(color); } return colorFactorList;}三、热力点大小和扩展大小
private void DrawHeatPoint2(Graphics graphics, HeatPoint heatPoint){ Console.WriteLine("heatPoint.Intensity = " + heatPoint.Intensity); int radius = 40 * (heatPoint.Intensity+6) / 240; List<System.Drawing.Point> pointsList = new List<System.Drawing.Point>(); for (double degrees = 0; degrees <= 360; degrees += 10) { // 在定义半径的圆的圆周上绘制新点 // 使用点坐标、半径和角度 // 计算这个迭代点在圆上的位置 System.Drawing.Point point = new System.Drawing.Point(); point.X = Convert.ToInt32(heatPoint.X + radius * Math.Cos((Math.PI / 180) * degrees)); point.Y = Convert.ToInt32(heatPoint.Y + radius * Math.Sin((Math.PI / 180) * degrees)); pointsList.Add(point); } // 创建新的颜色混合来告诉 PathGradientBrush 使用什么颜色以及放置它们的位置 ColorBlend colorBlend = new ColorBlend(3); colorBlend.Positions = new float[3] { 0, 0.8f, 1 }; colorBlend.Colors = new System.Drawing.Color[3] { System.Drawing.Color.FromArgb(0, System.Drawing.Color.White), System.Drawing.Color.FromArgb(heatPoint.Intensity, System.Drawing.Color.Black), System.Drawing.Color.FromArgb(heatPoint.Intensity, System.Drawing.Color.Black) }; // 创建新的 PathGradientBrush 以使用圆周点创建径向渐变 PathGradientBrush brush = new PathGradientBrush(pointsList.ToArray()); // 将颜色混合传递给 PathGradientBrush 以指示它如何生成渐变 brush.InterpolationColors = colorBlend; graphics.FillPolygon(brush, pointsList.ToArray()); //brush.Dispose();}四、更新视图
private void UpdateView(){ //灰度 Bitmap bitmap1 = CreateIntensityMask(new Bitmap((int)panel1.Width, (int)panel1.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb), heatPoints, 1); panel1.BackgroundImage = bitmap1; //上色 panel3.BackgroundImage = Colorize(bitmap1);}private Bitmap CreateIntensityMask(Bitmap bitmap, List<HeatPoint> aHeatPoints){ //从Bitmap获得Graphics GDI+ 绘图图面 Graphics graphics = Graphics.FromImage(bitmap); //清除整个绘图面并以白色填充 graphics.Clear(System.Drawing.Color.White); foreach (HeatPoint point in aHeatPoints) { DrawHeatPoint2(graphics, point); } return bitmap;}“C# .Net如何实现灰度图和HeatMap热力图winform”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注编程网网站，小编将为大家输出更多高质量的实用文章！
