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