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color.js
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color.js
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/**
* This module contains the color module
*/
define([
'./tools',
'./color_map'
],
function(tools, colorMap) {
'use strict';
var abs = Math.abs,
max = Math.max,
min = Math.min,
rand = Math.random,
round = Math.round;
var proto = RGBAColor.prototype;
/**
* Parses a color value and returns an integer in 0x<rr><gg><bb><aa> format.
*
* Supported input formats:
* - 0x<rr><gg><bb><aa>
* - '#<rr><gg><bb>'
* - 'rgb(<r>, <g>, <b>)'
* - 'rgba(<r>, <g>, <b>, <a>)'
* - 'hsl(<hue>, <saturation>, <lightness>)'
* - 'hsla(<hue>, <saturation>, <lightness>, <alpha>)'
*
* @param c The color
*/
function color(c, fallback) {
c = color.parse(c, fallback);
return c === null ? c : new RGBAColor(
c >> 24 & 0xff,
c >> 16 & 0xff,
c >> 8 & 0xff,
(c >> 0 & 0xff) / 255
);
}
color.RGBAColor = RGBAColor;
/**
* Represents the R, G, B and A values of a color.
*
* @param {Number} r Red (0..255)
* @param {Number} g Green (0..255)
* @param {Number} b Blue (0..255)
* @param {Number} a Alpha (0..1)
*/
function RGBAColor(r, g, b, a) {
var hsl = rgbToHsl(r, g, b);
this._properties = {
r: r = (r || 0),
g: g = (g || 0),
b: b = (b || 0),
a: a = a == null ? 1 : a,
h: hsl.h,
s: hsl.s,
l: hsl.l
};
}
proto.red = proto.r = getSet('r');
proto.green = proto.g = getSet('g');
proto.blue = proto.b = getSet('b');
proto.alpha = proto.a = getSet('a');
proto.hue = proto.h = getSet('h');
proto.saturation = proto.s = getSet('s');
proto.lightness = proto.l = getSet('l');
function getSet(prop) {
return function(val) {
return arguments.length > 0 ?
this.set(prop, val) :
this.get(prop);
};
}
/**
* Set one of r, g, b, a, h, s, l
* It allows the full forms too, since it only grabs charAt(0)
* E.g. red, alpha, hue, lightness etc.
* @param {String|Object} prop Property to change (e.g. hue, or h) or a
* hash-map of properties andT values
* @param {String} [val] Value to change if prop is the property and NOT a
* hash-map
*/
proto.set = function(prop, val) {
var hsl, rgb,
props = this._properties;
if (val == null) {
// Assume hash-map of props/vals
if (prop) {
for (var i in prop) {
this.set(i, prop[i]);
}
}
return this;
}
val = +val;
prop = prop.charAt(0);
switch (prop) {
case 'r':
case 'g':
case 'b':
case 'a':
props[prop] = val;
break;
case 'h':
case 's':
case 'l':
if (val > 1 || val < 0) {
throw Error('Property: ' + prop + ' must be from 0 to 1');
}
props[prop] = val;
rgb = hslToRgb(props.h, props.s, props.l);
props.r = rgb >> 24 & 0xff;
props.g = rgb >> 16 & 0xff;
props.b = rgb >> 8 & 0xff;
break;
default:
throw Error('No support for setting: ' + prop);
break;
}
return this;
};
/**
* Get one of r, g, b, a, h, s, l
*/
proto.get = function(prop) {
var props = this._properties;
switch (prop) {
case 'r':
case 'g':
case 'b':
return round(props[prop]);
case 'a':
return props[prop];
case 'h':
case 's':
case 'l':
return props[prop];
default:
throw Error('No support for getting: ' + prop);
break;
}
};
/**
* Returns a lighter color
*
* @returns {Number} [n] Increase by n lightness
*/
proto.lighter = function(n) {
var clone = this.clone();
clone.set('l', clone.get('l') + (n == null ? .01 : n));
return clone;
};
/**
* Returns a darker color
*
* @returns {Number} [n] Decreased by n lightness
*/
proto.darker = function(n) {
var clone = this.clone();
clone.set('l', clone.get('l') - (n == null ? .01 : n));
return clone;
};
/**
* Returns the midpoint color between this color and whatever is passed
*
* @returns {RGBAColor} The midpoint color
*/
proto.midpoint = function(c) {
c = color(c);
return new RGBAColor(
(this.r() + c.r()) / 2,
(this.g() + c.g()) / 2,
(this.b() + c.b()) / 2,
(this.a() + c.a()) / 2
);
};
/**
* Applies a colorMatrix
*
* @source http://fedev.blogspot.de/2008/04/filter-effects-color-matrix.html
* @param {colorMatrix} colorMatrix The value of the colorMatrix filter
*
* @returns {RGBAColor} The current RGBAColor instance
*/
proto.setColorMatrix = function(colorMatrix) {
var cm = [],
props = this._properties,
r = props.r,
g = props.g,
b = props.b,
a = props.a;
// cast to numbers
for(var i = colorMatrix.length; i--;) {
cm[i] = +colorMatrix[i];
}
this.set('r', range(r * cm[0] + g * cm[1] + b * cm[2] + a * cm[3] + 255 * cm[4], 0, 255));
this.set('g', range(r * cm[5] + g * cm[6] + b * cm[7] + a * cm[8] + 255 * cm[9], 0, 255));
this.set('b', range(r * cm[10] + g * cm[11] + b * cm[12] + a * cm[13] + 255 * cm[14], 0, 255));
this.set('a', range(r * cm[15] + g * cm[16] + b * cm[17] + a * cm[18] + cm[19], 0, 1));
return this;
}
proto._setPointAlongRange = function(prop, n, range) {
prop = prop.charAt(0);
var current = this[prop]();
switch (prop) {
case 'r':
case 'g':
case 'b':
this.set(
prop,
range ?
max(0, min(
255,
(n * range) + (current - range/2)
)) :
n * 255
);
break;
default:
// h,s,l,a
this.set(prop, range ? max(0, min(
1,
(n * range) + current - range/2
)) : n);
}
return this;
};
/**
* Returns a color with randomised properties as per the passed
* properties array and range.
*
* @param {Array|String} props The property/properties to be randomized
* @param {Number} range The range of the randomisation. 0..1 for hsla,
* and 0..255 for rgba. If passed, then the randomization will occur
* around the current value to the specified degree. If no range is passed
* then the produced value could be anything (red = 0..255, alpha = 0..1 etc.)
* @returns {RGBAColor} Randomly produced color
*/
proto.randomize = function(props, range) {
if (!props || typeof props == 'string') {
props = props ? [props] : ['r', 'g', 'b'];
}
var clone = this.clone(),
prop,
current;
for (var l = props.length; l--;) {
clone._setPointAlongRange(props[l], rand(), range);
}
return clone;
};
/**
* Clones the color instance and optionally mutates properties
*
* @param {Object} [properties] hash-map of properties/vals to mutate once
* cloned. E.g. `{hue:.2, lightness:.3}`
* @returns {RGBAColor} Cloned instance of color
*/
proto.clone = function(properties) {
return properties ? color(+this).set(properties) : color(+this);
};
/**
* Returns the color in rgba() format as specified in the CSS spec
*
* @returns {String} RGBA representation
*/
proto.rgba = function() {
return 'rgba(' + [
this.r(),
this.g(),
this.b(),
this.a()
].join(',') + ')';
};
/**
* Returns the color in rgb() format as specified in the CSS spec
*
* @returns {String} RGB representation
*/
proto.rgb = function() {
return 'rgb(' + [
this.r(),
this.g(),
this.b()
].join(',') + ')';
};
/**
* Returns the color in hsla() format as specified in the CSS spec
*
* @returns {String} HSLA representation
*/
proto.hsla = function() {
return 'hsla(' + [
round(this.h() * 360),
round(this.s() * 100) + '%',
round(this.l() * 100) + '%',
this.a()
].join(',') + ')';
};
/**
* Returns the color in 32-bit int repr
*
* @returns {Number} Color as 32-bit int
*/
proto.int32 = function() {
return (
(this.r() & 0xff) << 24 |
(this.g() & 0xff) << 16 |
(this.b() & 0xff) << 8 |
(this.a() * 0xff & 0xff)
) >>> 0;
};
/**
* Returns the color in 32-bit repr ('0x<rr><gg><bb><aa>')
*
* @returns {String} Color as '0x<rr><gg><bb><aa>'
*/
proto.toString = function() {
return '0x' +
(
'0000000' + //make sure we have at least eight hex digits
((
(this.r() & 0xff) << 24 |
(this.g() & 0xff) << 16 |
(this.b() & 0xff) << 8 |
(this.a() * 0xff & 0xff)
) >>> 0).toString(16)
).slice(-8); // use the last eight hex digits
};
// Helper functions for hsl to rgb conversion
function hueToRgb(m1, m2, h) {
h = h < 0 ? h + 1 : (h > 1 ? h - 1 : h);
if (h * 6 < 1) {
return m1 + (m2 - m1) * h * 6;
}
if (h * 2 < 1) {
return m2;
}
if (h * 3 < 2) {
return m1 + (m2 - m1) * (2/3 - h) * 6;
}
return m1;
}
/**
* Converts h, s, l values to a 0xrrggbb value.
*
* @param {number} h Hue value from 0 to 1
* @param {number} s Saturation value from 0 to 1
* @param {number} l Lightness value from 0 to 1
* @returns {number} A 3 byte integer, byte 3 is r, byte 2 is g, byte 1 is b
*/
function hslToRgb(h, s, l) {
var m2 = l <= .5 ? l * (s + 1) : l + s - l * s;
var m1 = l * 2 - m2;
var r = hueToRgb(m1, m2, h + 1/3) * 255,
g = hueToRgb(m1, m2, h) * 255,
b = hueToRgb(m1, m2, h - 1/3) * 255;
return round(r) << 24 | round(g) << 16 | round(b) << 8;
}
function rgbToHsl(r, g, b) {
r /= 255;
g /= 255;
b /= 255;
var h, s, l, diff,
mmax = max(r, g, b),
mmin = min(r, g, b);
l = (mmin + mmax) / 2;
if (mmax == mmin) {
h = s = 0;
} else {
diff = mmax - mmin;
s = l > .5 ? diff / (2 - mmax - mmin) : diff / (mmax + mmin);
switch (mmax) {
case r: h = (g - b) / diff + (g < b ? 6 : 0); break;
case g: h = (b - r) / diff + 2; break;
case b: h = (r - g) / diff + 4; break;
}
h /= 6;
}
return {h:h, s:s, l:l};
}
function range(value, mmin, mmax) {
return min(mmax, max(mmin, value));
}
/**
* Parses a color value and returns an object with the properties:
* 'r', 'g', 'b' and 'a'
*
* Supported input formats:
* - 0x<rr><gg><bb><aa>
* - '#<rr><gg><bb>'
* - 'rgb(<r>, <g>, <b>)'
* - 'rgba(<r>, <g>, <b>, <a>)'
* - 'hsl(<hue>, <saturation>, <lightness>)'
* - 'hsla(<hue>, <saturation>, <lightness>, <alpha>)'
*
* @param value The value to parse as a color
* @param fallback The value to fallback on if we can't parse `value`
*/
color.parse = function parseColor(value, fallback) {
var alpha;
value = String(value);
if (value in colorMap) {
value = colorMap[value];
}
if (/^#[0-9a-f]{6}$/i.test(value)) {
value = (parseInt(value.slice(1), 16) << 8 | 0xff) >>> 0;
} else if (/^#[0-9a-f]{8}$/i.test(value)) {
value = parseInt(value.slice(1), 16) >>> 0;
} else if (/^#[0-9a-f]{3}$/i.test(value)) {
value = parseInt(value.slice(1), 16);
var r = value & 0xf00, g = value & 0xf0, b = value & 0xf;
value = (r << 20 | r << 16 | g << 16 | g << 12 | b << 12 | b << 8 | 0xff) >>> 0;
}
if (!isNaN(value)) {
return +value;
}
value = value.split('(');
if (value.length == 2) {
var values = value[1].slice(0, -1).split(','), len = values.length;
switch (value[0]) {
case 'rgb':
alpha = 255;
// fallthrough intended
case 'rgba':
if (len == 4 || len == 3 && alpha) {
return (
(values[0] & 0xff) << 24 |
(values[1] & 0xff) << 16 |
(values[2] & 0xff) << 8 |
(alpha || values[3] * 0xff & 0xff)
) >>> 0;
}
break;
case 'hsl':
alpha = 255;
// fallthrough intended
case 'hsla':
if (len == 4 || len == 3 && alpha) {
value = hslToRgb(values[0] % 360 / 360, parseInt(values[1]) / 100, parseInt(values[2]) / 100);
return value | (alpha || values[3] * 0xff & 0xff);
}
break;
}
}
return fallback == null ? null : color.parse(fallback);
};
return color;
});