例如：我正在生成一个显示客户商店销售业绩的折线图。用户将提交商店编号 (1-200)，图表将为每个商店绘制一条线。我需要一个函数，它会为每个商店返回一种颜色，我希望颜色看起来彼此之间有很大的不同。
我非常接近这个工作。
这是一个迭代色调的jsfiddle：http: //jsfiddle.net/cabichandani/ub3H9/5/
var scale = 200;
var hueSkip = 5;
for (var storeNumber = 1; storeNumber < scale; storeNumber++) {
var h = storeNumber/scale;
var color = getColor(h);
var colorString = getColorString(h);
$("#store-list")
.append('<li style="background-color:' +
colorString +
';">Store: ' +
storeNumber + ' hue:' +
h.toFixed(3) + ' color:' +
colorString + '</li>');
}
function getColorString(hue) {
var color = getColor(hue);
return "rgb(" + color[0] + "," + color[1] + "," + color[2] + ")";
}
function getColor(hue) {
var huePercent = hue * 100;
var hueSkipAmount = hueSkip * huePercent;
var newHuePercent = (huePercent + hueSkipAmount) % 100;
var newHue = newHuePercent / 100;
return hslToRgb(newHue,1,0.5);
}
/**
* Converts an HSL color value to RGB. Conversion formula
* adapted from http://en.wikipedia.org/wiki/HSL_color_space.
* Assumes h, s, and l are contained in the set [0, 1] and
* returns r, g, and b in the set [0, 255].
*
* @param Number h The hue
* @param Number s The saturation
* @param Number l The lightness
* @return Array The RGB representation
*/
function hslToRgb(h, s, l){
var r, g, b;
if(s == 0){
r = g = b = l; // achromatic
}else{
function hue2rgb(p, q, t){
if(t < 0) t += 1;
if(t > 1) t -= 1;
if(t < 1/6) return p + (q - p) * 6 * t;
if(t < 1/2) return q;
if(t < 2/3) return p + (q - p) * (2/3 - t) * 6;
return p;
}
var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
var p = 2 * l - q;
r = hue2rgb(p, q, h + 1/3);
g = hue2rgb(p, q, h);
b = hue2rgb(p, q, h - 1/3);
}
return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
}
/**
* Converts an RGB color value to HSL. Conversion formula
* adapted from http://en.wikipedia.org/wiki/HSL_color_space.
* Assumes r, g, and b are contained in the set [0, 255] and
* returns h, s, and l in the set [0, 1].
*
* @param Number r The red color value
* @param Number g The green color value
* @param Number b The blue color value
* @return Array The HSL representation
*/
function rgbToHsl(r, g, b){
r /= 255, g /= 255, b /= 255;
var max = Math.max(r, g, b), min = Math.min(r, g, b);
var h, s, l = (max + min) / 2;
if(max == min){
h = s = 0; // achromatic
}else{
var d = max - min;
s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
switch(max){
case r: h = (g - b) / d + (g < b ? 6 : 0); break;
case g: h = (b - r) / d + 2; break;
case b: h = (r - g) / d + 4; break;
}
h /= 6;
}
return [h, s, l];
}
我有一个叫做“hue skip”的概念，它试图跳过看起来太相似的颜色。
使用 5 的 hueSkip，我可以将 1-6 个存储在一起，它们很容易区分红黄色。但如果我将 10 和 11 放在同一张图上，它们看起来几乎是相同的绿色阴影。
我想改进功能以提供更容易区分的颜色，或者完全采用另一种方法。
