C# .Net实现灰度图和HeatMap热力图winform(进阶)

目录

一、前文

前文可以参考我的前一篇博文：c# .net实现简易灰度图和酷炫heatmap热力图winform

但是，先前的热力图效果，我并不满意。不满意的地方主要有三点：

因此，我做了改进，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 rectangl内能与什么因素有关e((int)(i * 2), 0, (int)2, colorpanel.height);        graphic.fillrectangle(solidbrush, rectangle);        graphic.save();        solidbrush.dispo();    }    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>家访内容怎么写;/// <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 bl姜夔 扬州慢uespan = 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亲子游戏大全的位置        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.dispo();}

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 肖的组词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;} 

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