计算具有2种颜色和百分比/位置的颜色十六进制 [英] Calculate color HEX having 2 colors and percent/position

问题描述

是否可以在渐变的中间计算颜色?

Is it possible to calculate a color in a middle of a gradient?

var color1 = 'FF0000';
var color2 = '00FF00';

// 50% between the two colors, should return '808000'
var middle = gradient(color1, color2, 0.5); 

我只有两个十六进制字符串，我想要一个作为回报.

I only have two hex strings, and I want one in return.

推荐答案

这应该有效:

基本上，这涉及到将它们转换为十进制，找到一半，然后将结果转换回十六进制，然后将它们连接起来.

It basically involves converting them to decimal, finding the halves, converting the results back to hex and then concatenating them.

var color1 = 'FF0000';
var color2 = '00FF00';
var ratio = 0.5;
var hex = function(x) {
    x = x.toString(16);
    return (x.length == 1) ? '0' + x : x;
};

var r = Math.ceil(parseInt(color1.substring(0,2), 16) * ratio + parseInt(color2.substring(0,2), 16) * (1-ratio));
var g = Math.ceil(parseInt(color1.substring(2,4), 16) * ratio + parseInt(color2.substring(2,4), 16) * (1-ratio));
var b = Math.ceil(parseInt(color1.substring(4,6), 16) * ratio + parseInt(color2.substring(4,6), 16) * (1-ratio));

var middle = hex(r) + hex(g) + hex(b);

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