如何在C＃中获得彩虹颜色渐变？ [英] How do I get a rainbow color gradient in C#?

问题描述

我想根据彩虹颜色（红色...黄色...绿色...蓝色...）来枚举颜色。

I'd like to have an enumeration of Colors based on the rainbow colors (red... yellow... green... blue...).

我看到基本上有两种方法：

I see basically two ways to do that:

1. 创建一个包含一些重要参考颜色的查找表，我根本不喜欢这个想法。

1. Create a lookup table containing some important reference colors and interpolate between these. I don't like this idea at all.

应用一些或多或少的花哨数学。可能更少，但我不太清楚它是如何工作的。任何想法？

Apply some more or less fancy math. Probably less, but I don't quite see how it works. Any ideas?

（哦，我做了一些SO研究，已经发布，请指向我的位置，我会删除这个。）

(Oh, and while I did some SO research, I found no good results. If this question was already posted, please just point me to the location and I'll delete this.)

编辑：独立于使用的技术来显示渐变。例如，类似GetRainbowColor（float f）的f（范围从0（红色）到1（紫色））会工作得很好。

I'd prefer to have this independent of the used technology to display the gradient. For instance, something like GetRainbowColor (float f) with f ranging from 0 (red) to 1 (violet) would work great.

推荐答案

p>这比你想象的要容易。

This is easier than you think.

首先，您需要一个hsv或hsl to rgb转换函数。 这里是C＃代码做这种转换。

First you need an hsv or hsl to rgb conversion function. Here is C# code to do that conversion.

然后，您只需遍历hue h 的所有可能值，同时保留饱和度 s和光度 l 常数。

Then you simply iterate over all of the possible values of the hue h while keeping the saturation s and luminosity l constant.

彩虹间隔均匀：

for(double i = 0; i < 1; i+=0.01)
{
    ColorRGB c = HSL2RGB(i, 0.5, 0.5);
    //do something with the color
}

通过将所有这些颜色添加到 List< ColorRGB> 并返回适当的索引颜色，可以获得所需的函数 GetRainbowColor 。

You could also easily create your desired function GetRainbowColor this way by adding all of these colors to a List<ColorRGB> and returning the appropriate indexed color.

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