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| /*
| ## Color Convert
|
| http://blog.csdn.net/idfaya/article/details/6770414
| 颜色空间RGB与HSV(HSL)的转换
| */
| // https://github.com/harthur/color-convert/blob/master/conversions.js
| module.exports = {
| rgb2hsl: function rgb2hsl(rgb) {
| var r = rgb[0] / 255,
| g = rgb[1] / 255,
| b = rgb[2] / 255,
| min = Math.min(r, g, b),
| max = Math.max(r, g, b),
| delta = max - min,
| h, s, l;
|
| if (max == min)
| h = 0;
| else if (r == max)
| h = (g - b) / delta;
| else if (g == max)
| h = 2 + (b - r) / delta;
| else if (b == max)
| h = 4 + (r - g) / delta;
|
| h = Math.min(h * 60, 360);
|
| if (h < 0)
| h += 360;
|
| l = (min + max) / 2;
|
| if (max == min)
| s = 0;
| else if (l <= 0.5)
| s = delta / (max + min);
| else
| s = delta / (2 - max - min);
|
| return [h, s * 100, l * 100];
| },
| rgb2hsv: function rgb2hsv(rgb) {
| var r = rgb[0],
| g = rgb[1],
| b = rgb[2],
| min = Math.min(r, g, b),
| max = Math.max(r, g, b),
| delta = max - min,
| h, s, v;
|
| if (max === 0)
| s = 0;
| else
| s = (delta / max * 1000) / 10;
|
| if (max == min)
| h = 0;
| else if (r == max)
| h = (g - b) / delta;
| else if (g == max)
| h = 2 + (b - r) / delta;
| else if (b == max)
| h = 4 + (r - g) / delta;
|
| h = Math.min(h * 60, 360);
|
| if (h < 0)
| h += 360;
|
| v = ((max / 255) * 1000) / 10;
|
| return [h, s, v];
| },
| hsl2rgb: function hsl2rgb(hsl) {
| var h = hsl[0] / 360,
| s = hsl[1] / 100,
| l = hsl[2] / 100,
| t1, t2, t3, rgb, val;
|
| if (s === 0) {
| val = l * 255;
| return [val, val, val];
| }
|
| if (l < 0.5)
| t2 = l * (1 + s);
| else
| t2 = l + s - l * s;
| t1 = 2 * l - t2;
|
| rgb = [0, 0, 0];
| for (var i = 0; i < 3; i++) {
| t3 = h + 1 / 3 * -(i - 1);
| if (t3 < 0) t3++;
| if (t3 > 1) t3--;
|
| if (6 * t3 < 1)
| val = t1 + (t2 - t1) * 6 * t3;
| else if (2 * t3 < 1)
| val = t2;
| else if (3 * t3 < 2)
| val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
| else
| val = t1;
|
| rgb[i] = val * 255;
| }
|
| return rgb;
| },
| hsl2hsv: function hsl2hsv(hsl) {
| var h = hsl[0],
| s = hsl[1] / 100,
| l = hsl[2] / 100,
| sv, v;
| l *= 2;
| s *= (l <= 1) ? l : 2 - l;
| v = (l + s) / 2;
| sv = (2 * s) / (l + s);
| return [h, sv * 100, v * 100];
| },
| hsv2rgb: function hsv2rgb(hsv) {
| var h = hsv[0] / 60
| var s = hsv[1] / 100
| var v = hsv[2] / 100
| var hi = Math.floor(h) % 6
|
| var f = h - Math.floor(h)
| var p = 255 * v * (1 - s)
| var q = 255 * v * (1 - (s * f))
| var t = 255 * v * (1 - (s * (1 - f)))
|
| v = 255 * v
|
| switch (hi) {
| case 0:
| return [v, t, p]
| case 1:
| return [q, v, p]
| case 2:
| return [p, v, t]
| case 3:
| return [p, q, v]
| case 4:
| return [t, p, v]
| case 5:
| return [v, p, q]
| }
| },
| hsv2hsl: function hsv2hsl(hsv) {
| var h = hsv[0],
| s = hsv[1] / 100,
| v = hsv[2] / 100,
| sl, l;
|
| l = (2 - s) * v;
| sl = s * v;
| sl /= (l <= 1) ? l : 2 - l;
| l /= 2;
| return [h, sl * 100, l * 100];
| },
| // http://www.140byt.es/keywords/color
| rgb2hex: function(
| a, // red, as a number from 0 to 255
| b, // green, as a number from 0 to 255
| c // blue, as a number from 0 to 255
| ) {
| return "#" + ((256 + a << 8 | b) << 8 | c).toString(16).slice(1)
| },
| hex2rgb: function(
| a // take a "#xxxxxx" hex string,
| ) {
| a = '0x' + a.slice(1).replace(a.length > 4 ? a : /./g, '$&$&') | 0;
| return [a >> 16, a >> 8 & 255, a & 255]
| }
| }
|
|
