Shuo/client/js/libs/stringcolor.js

88 lines
1.9 KiB
JavaScript

/*!
* stringcolor
* Generate a consistent color from any string.
*
* Source:
* https://github.com/erming/stringcolor
*
* Version 0.2.0
*/
(function($) {
/**
* Generate hex color code from a string.
*
* @param {String} string
*/
$.stringcolor = function(string) {
return "#" + stringcolor(string);
};
/**
* Set one or more CSS properties for the set of matched elements.
*
* @param {String|Array} property
* @param {String} string
*/
$.fn.stringcolor = function(property, string) {
if (!property || !string) {
throw new Error("$(selector).string_to_color() takes 2 arguments");
}
return this.each(function() {
var props = [].concat(property);
var $this = $(this);
$.map(props, function(p) {
$this.css(p, $.stringcolor(string));
});
});
};
})(jQuery);
/*!
* Name: string_to_color
* Author: Brandon Corbin [code@icorbin.com]
* Website: http://icorbin.com
*/
function string_to_color(str) {
// Generate a Hash for the String
var hash = function(word) {
var h = 0;
for (var i = 0; i < word.length; i++) {
h = word.charCodeAt(i) + ((h << 5) - h);
}
return h;
};
// Change the darkness or lightness
var shade = function(color, prc) {
var num = parseInt(color, 16),
amt = Math.round(2.55 * prc),
R = (num >> 16) + amt,
G = (num >> 8 & 0x00FF) + amt,
B = (num & 0x0000FF) + amt;
return (0x1000000 + (R < 255 ? R < 1 ? 0 : R : 255) * 0x10000 +
(G < 255 ? G < 1 ? 0 : G : 255) * 0x100 +
(B < 255 ? B < 1 ? 0 : B : 255))
.toString(16)
.slice(1);
};
// Convert init to an RGBA
var int_to_rgba = function(i) {
var color = ((i >> 24) & 0xFF).toString(16) +
((i >> 16) & 0xFF).toString(16) +
((i >> 8) & 0xFF).toString(16) +
(i & 0xFF).toString(16);
return color;
};
return shade(
int_to_rgba(hash(str)),
-10
);
}
var cache = {};
function stringcolor(str) {
return cache[str] = cache[str] || string_to_color(str);
}