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/*
Copyright (c) 2004-2010, The Dojo Foundation All Rights Reserved.
Available via Academic Free License >= 2.1 OR the modified BSD license.
see: http://dojotoolkit.org/license for details
*/
if(!dojo._hasResource["dojo._base.Color"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojo._base.Color"] = true;
dojo.provide("dojo._base.Color");
dojo.require("dojo._base.array");
dojo.require("dojo._base.lang");
(function(){
var d = dojo;
dojo.Color = function(/*Array|String|Object*/ color){
// summary:
// Takes a named string, hex string, array of rgb or rgba values,
// an object with r, g, b, and a properties, or another `dojo.Color` object
// and creates a new Color instance to work from.
//
// example:
// Work with a Color instance:
// | var c = new dojo.Color();
// | c.setColor([0,0,0]); // black
// | var hex = c.toHex(); // #000000
//
// example:
// Work with a node's color:
// | var color = dojo.style("someNode", "backgroundColor");
// | var n = new dojo.Color(color);
// | // adjust the color some
// | n.r *= .5;
// | console.log(n.toString()); // rgb(128, 255, 255);
if(color){ this.setColor(color); }
};
// FIXME:
// there's got to be a more space-efficient way to encode or discover
// these!! Use hex?
dojo.Color.named = {
black: [0,0,0],
silver: [192,192,192],
gray: [128,128,128],
white: [255,255,255],
maroon: [128,0,0],
red: [255,0,0],
purple: [128,0,128],
fuchsia: [255,0,255],
green: [0,128,0],
lime: [0,255,0],
olive: [128,128,0],
yellow: [255,255,0],
navy: [0,0,128],
blue: [0,0,255],
teal: [0,128,128],
aqua: [0,255,255],
transparent: d.config.transparentColor || [255,255,255]
};
dojo.extend(dojo.Color, {
r: 255, g: 255, b: 255, a: 1,
_set: function(r, g, b, a){
var t = this; t.r = r; t.g = g; t.b = b; t.a = a;
},
setColor: function(/*Array|String|Object*/ color){
// summary:
// Takes a named string, hex string, array of rgb or rgba values,
// an object with r, g, b, and a properties, or another `dojo.Color` object
// and sets this color instance to that value.
//
// example:
// | var c = new dojo.Color(); // no color
// | c.setColor("#ededed"); // greyish
if(d.isString(color)){
d.colorFromString(color, this);
}else if(d.isArray(color)){
d.colorFromArray(color, this);
}else{
this._set(color.r, color.g, color.b, color.a);
if(!(color instanceof d.Color)){ this.sanitize(); }
}
return this; // dojo.Color
},
sanitize: function(){
// summary:
// Ensures the object has correct attributes
// description:
// the default implementation does nothing, include dojo.colors to
// augment it with real checks
return this; // dojo.Color
},
toRgb: function(){
// summary:
// Returns 3 component array of rgb values
// example:
// | var c = new dojo.Color("#000000");
// | console.log(c.toRgb()); // [0,0,0]
var t = this;
return [t.r, t.g, t.b]; // Array
},
toRgba: function(){
// summary:
// Returns a 4 component array of rgba values from the color
// represented by this object.
var t = this;
return [t.r, t.g, t.b, t.a]; // Array
},
toHex: function(){
// summary:
// Returns a CSS color string in hexadecimal representation
// example:
// | console.log(new dojo.Color([0,0,0]).toHex()); // #000000
var arr = d.map(["r", "g", "b"], function(x){
var s = this[x].toString(16);
return s.length < 2 ? "0" + s : s;
}, this);
return "#" + arr.join(""); // String
},
toCss: function(/*Boolean?*/ includeAlpha){
// summary:
// Returns a css color string in rgb(a) representation
// example:
// | var c = new dojo.Color("#FFF").toCss();
// | console.log(c); // rgb('255','255','255')
var t = this, rgb = t.r + ", " + t.g + ", " + t.b;
return (includeAlpha ? "rgba(" + rgb + ", " + t.a : "rgb(" + rgb) + ")"; // String
},
toString: function(){
// summary:
// Returns a visual representation of the color
return this.toCss(true); // String
}
});
dojo.blendColors = function(
/*dojo.Color*/ start,
/*dojo.Color*/ end,
/*Number*/ weight,
/*dojo.Color?*/ obj
){
// summary:
// Blend colors end and start with weight from 0 to 1, 0.5 being a 50/50 blend,
// can reuse a previously allocated dojo.Color object for the result
var t = obj || new d.Color();
d.forEach(["r", "g", "b", "a"], function(x){
t[x] = start[x] + (end[x] - start[x]) * weight;
if(x != "a"){ t[x] = Math.round(t[x]); }
});
return t.sanitize(); // dojo.Color
};
dojo.colorFromRgb = function(/*String*/ color, /*dojo.Color?*/ obj){
// summary:
// Returns a `dojo.Color` instance from a string of the form
// "rgb(...)" or "rgba(...)". Optionally accepts a `dojo.Color`
// object to update with the parsed value and return instead of
// creating a new object.
// returns:
// A dojo.Color object. If obj is passed, it will be the return value.
var m = color.toLowerCase().match(/^rgba?\(([\s\.,0-9]+)\)/);
return m && dojo.colorFromArray(m[1].split(/\s*,\s*/), obj); // dojo.Color
};
dojo.colorFromHex = function(/*String*/ color, /*dojo.Color?*/ obj){
// summary:
// Converts a hex string with a '#' prefix to a color object.
// Supports 12-bit #rgb shorthand. Optionally accepts a
// `dojo.Color` object to update with the parsed value.
//
// returns:
// A dojo.Color object. If obj is passed, it will be the return value.
//
// example:
// | var thing = dojo.colorFromHex("#ededed"); // grey, longhand
//
// example:
// | var thing = dojo.colorFromHex("#000"); // black, shorthand
var t = obj || new d.Color(),
bits = (color.length == 4) ? 4 : 8,
mask = (1 << bits) - 1;
color = Number("0x" + color.substr(1));
if(isNaN(color)){
return null; // dojo.Color
}
d.forEach(["b", "g", "r"], function(x){
var c = color & mask;
color >>= bits;
t[x] = bits == 4 ? 17 * c : c;
});
t.a = 1;
return t; // dojo.Color
};
dojo.colorFromArray = function(/*Array*/ a, /*dojo.Color?*/ obj){
// summary:
// Builds a `dojo.Color` from a 3 or 4 element array, mapping each
// element in sequence to the rgb(a) values of the color.
// example:
// | var myColor = dojo.colorFromArray([237,237,237,0.5]); // grey, 50% alpha
// returns:
// A dojo.Color object. If obj is passed, it will be the return value.
var t = obj || new d.Color();
t._set(Number(a[0]), Number(a[1]), Number(a[2]), Number(a[3]));
if(isNaN(t.a)){ t.a = 1; }
return t.sanitize(); // dojo.Color
};
dojo.colorFromString = function(/*String*/ str, /*dojo.Color?*/ obj){
// summary:
// Parses `str` for a color value. Accepts hex, rgb, and rgba
// style color values.
// description:
// Acceptable input values for str may include arrays of any form
// accepted by dojo.colorFromArray, hex strings such as "#aaaaaa", or
// rgb or rgba strings such as "rgb(133, 200, 16)" or "rgba(10, 10,
// 10, 50)"
// returns:
// A dojo.Color object. If obj is passed, it will be the return value.
var a = d.Color.named[str];
return a && d.colorFromArray(a, obj) || d.colorFromRgb(str, obj) || d.colorFromHex(str, obj);
};
})();
}
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