从360到0和从0到（-360）和从（-360）到（-720）的颜色（h，s，b）等等 [英] Colors (h,s,b) from 360 to 0 and from 0 to (-360) and from (-360) to (-720) and so on

问题描述

我有一个HSB颜色问题，不知道如何以正确的方式计算。

I've got a HSB color problem and don't know how to calculate it in the right way.

我有一个颜色在 360 和 0 并且如果i substrate -1 从 0 我得到值 -1 而不是 360 。我想我要做一些模数来获得正确的值？所以我的问题是将单位的倍数转换为0和360之间的数字。有人可以帮助我吗？

I've got Hue of a color between 360 and 0 and if i substrate -1 from 0 i get the value -1 and not 360. I'think i've to do something with modulo to get the right values ?! so my problem is to convert a multiple of a unit to a number between 0 and 360. Could someone help me?

推荐答案

负色调值相当于 360 + value 意味着-10等于350.要实现那个行为，请执行：

A negative hue value is equivalent to 360 + value, that means -10 is equivalent to 350. To achieve that behavior do:

var val = -10; // or whatever your value is
var hue = (val + 360) % 360 // --> 350

这对正值也正确，val = 380 - > hue =正在处理大于+/- 360的值，只需添加 720 （或1080，1440，...），而不是 360

That works also correctly with positive values, val = 380 --> hue = 20. If you are dealing with values greater than +/- 360 simply add 720 (or 1080, 1440, ...) instead of 360 before doing % 360.

我们可以将它包装在一个方便的函数中，无论你输入什么，总是返回一个介于0和360之间的值：

We can wrap it in a handy function that whatever you input always returns a value between 0 and 360:

function adjustHue(val) {
    if (val < 0) val += Math.ceil(-val / 360) * 360;
    return val % 360;
}

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