C# .Net如何实现灰度图和HeatMap热力图winform

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 newColors = new List();    //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;}/// 
/// 获得两个颜色之间渐进颜色的集合/// 
/// 起始颜色/// 终止颜色/// 渐进颜色的个数/// 返回颜色集合public static List GetGradientColorList(Color srcColor, Color desColor, int count){    List colorFactorList = new List();    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 pointsList = new List();    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 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网站，小编将为大家输出更多高质量的实用文章！