在Javascript中重映射或映射功能 [英] Remap or Map function in Javascript

问题描述

最近，我的大部分编程经验都在 Processing 中，最近我一直想分支对某些JavaScript有更深入的了解，因为它们有些相关。

Of late, most of my programming experience has been in Processing, and more recently I have been wanting to branch out a little deeper in to some JavaScript, since they are slightly related.

我只是想知道，因为我最近的搜索没有发现，如果JavaScript与Processing的map函数有类似的功能，其中值和范围是获取和重新映射到新的范围？

I was just wondering, as my recent searching has turned up nothing, if JavaScript had a similar function to Processing's "map" function, in which a value and it's range is taken and remapped to a new range?

更多信息： http://processing.org/reference/map_.html

PS：是的，我也知道www.processingjs.org存在，但是我只是想知道JS是否有这样的功能本身。

PS: Yes, I also know that www.processingjs.org exists, but I was just wondering if JS had such a function natively.

推荐答案

AFAIK下面的功能产生与原始处理功能相同的行为：

The function below AFAIK produces the same behaviour as the original Processing function:

function map_range(value, low1, high1, low2, high2) {
    return low2 + (high2 - low2) * (value - low1) / (high1 - low1);
}

边界值肯定是正确的，并产生我期望的对于超出的值也是如此 map_range（-1，0，1，0，100）返回 -100 。

It's certainly correct for "in bounds" values, and produces what I would expect for "out of bounds" values too, e.g. map_range(-1, 0, 1, 0, 100) returns -100.

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