径向渐变多边形C＃ [英] Radial gradient polygon C#

问题描述

我想制作一个程序，从文件中取X和Y坐标，它将是一个国家。我用多边形做了一个带点的数组，这就是全部。但是，我需要填充3种颜色，从蓝色到黄色，从黄色到橙色的径向渐变。如何制作这种径向渐变？



一张我需要做的照片：< a



编辑：我试图找到一个中心，它只适用于黄色和蓝色，但我需要是蓝黄色和橙色。



我尝试过：



我试图制作类似的东西，但我不会工作：

Hi, I want to make a program , that take X and Y coordinates from a file, and It will be a country. I made that , with polygon, an array with points and that's all. But, I need to fill this, with 3 colors, with a radial gradient from blue to yellow and from yellow to orange. How can I make this radial gradient ?

A photo with the result of what I need to do : <a

I tried to get a center , and it works only for Yellow and Blue but I need to be blue yellow and orange.

What I have tried:

I tried to make something like that , but I will not works :

using (PathGradientBrush path_brush = new PathGradientBrush(curvepoints))
{
    path_brush.CenterPoint = new Point(this.ClientSize.Width / 2, this.ClientSize.Height / 2);
    path_brush.CenterColor = Color.Blue;
    path_brush.SurroundColors = new Color[] { Color.Orange Color.Yellow };
    g.FillPolygon(path_brush, curvepoints);
}

推荐答案

这是一张热图。



找到中心。



然后，从中心出来的像素根据它们与最近边界的相对距离进行着色。使用（百分比）band范围。



（或者它是一个扭曲;特定多边形内的径向渐变;重新计算半径再次基于相对距离。

It's a "heat map".

Locate the "center".

Then the pixels, from the center out, are colored based on their relative distance from the nearest border. Use (percent) ranges for "bands".

(Or it's a "warp"; of a radial gradient within a particular polygon; "recalculating" the "radius" based on relative distances again.

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