94 lines
3.2 KiB
JavaScript
94 lines
3.2 KiB
JavaScript
Misuzu.Colour = function(raw) {
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this.setRaw(raw || 0);
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};
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Misuzu.Colour.prototype.raw = 0;
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Misuzu.Colour.FLAG_INHERIT = 0x40000000;
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Misuzu.Colour.READABILITY_THRESHOLD = 186;
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Misuzu.Colour.LUMINANCE_WEIGHT_RED = .299;
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Misuzu.Colour.LUMINANCE_WEIGHT_GREEN = .587;
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Misuzu.Colour.LUMINANCE_WEIGHT_BLUE = .114;
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Misuzu.Colour.none = function() { return new Misuzu.Colour(Misuzu.Colour.FLAG_INHERIT); };
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Misuzu.Colour.fromRGB = function(red, green, blue) {
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var colour = new Misuzu.Colour;
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colour.setRed(red);
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colour.setGreen(green);
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colour.setBlue(blue);
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return colour;
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};
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Misuzu.Colour.fromHex = function(hex) {
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var colour = new Misuzu.Colour;
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colour.setHex(hex);
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return colour;
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};
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Misuzu.Colour.prototype.getRaw = function() { return this.raw; };
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Misuzu.Colour.prototype.setRaw = function(raw) {
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this.raw = parseInt(raw) & 0x7FFFFFFF;
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};
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Misuzu.Colour.prototype.getInherit = function() { return (this.getRaw() & Misuzu.Colour.FLAG_INHERIT) > 0; };
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Misuzu.Colour.prototype.setInherit = function(inherit) {
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var raw = this.getRaw();
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if(inherit)
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raw |= Misuzu.Colour.FLAG_INHERIT;
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else
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raw &= ~Misuzu.Colour.FLAG_INHERIT;
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this.setRaw(raw);
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};
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Misuzu.Colour.prototype.getRed = function() { return (this.getRaw() >> 16) & 0xFF };
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Misuzu.Colour.prototype.setRed = function(red) {
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var raw = this.getRaw();
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raw &= ~0xFF0000;
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raw |= (parseInt(red) & 0xFF) << 16;
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this.setRaw(raw);
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};
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Misuzu.Colour.prototype.getGreen = function() { return (this.getRaw() >> 8) & 0xFF };
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Misuzu.Colour.prototype.setGreen = function(green) {
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var raw = this.getRaw();
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raw &= ~0xFF0000;
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raw |= (parseInt(green) & 0xFF) << 8;
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this.setRaw(raw);
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};
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Misuzu.Colour.prototype.getBlue = function() { return this.getRaw() & 0xFF };
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Misuzu.Colour.prototype.setBlue = function(blue) {
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var raw = this.getRaw();
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raw &= ~0xFF0000;
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raw |= parseInt(blue) & 0xFF;
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this.setRaw(raw);
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};
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Misuzu.Colour.prototype.getLuminance = function() {
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return Misuzu.Colour.LUMINANCE_WEIGHT_RED * this.getRed()
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+ Misuzu.Colour.LUMINANCE_WEIGHT_GREEN * this.getGreen()
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+ Misuzu.Colour.LUMINANCE_WEIGHT_BLUE * this.getBlue();
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};
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Misuzu.Colour.prototype.getHex = function() {
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var hex = (this.getRaw() & 0xFFFFFF).toString(16);
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if(hex.length < 6)
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hex = '000000'.substring(0, 6 - hex.length) + hex;
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return hex;
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};
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Misuzu.Colour.prototype.setHex = function(hex) {
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hex = (hex || '').toString();
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if(hex[0] === '#')
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hex = hex.substring(1);
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if(/[^A-Fa-f0-9]/g.test(hex))
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throw 'Argument contains invalid characters.';
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if(hex.length === 3)
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hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
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else if(hex.length !== 6)
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throw 'Argument is not a hex string.';
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return this.setRaw(parseInt(hex, 16));
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};
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Misuzu.Colour.prototype.getCSS = function() {
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if(this.getInherit())
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return 'inherit';
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return '#' + this.getHex();
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};
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Misuzu.Colour.prototype.getCSSConstrast = function(dark, light, inheritIsDark) {
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dark = dark || 'dark';
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light = light || 'light';
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if(this.getInherit())
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return inheritIsDark ? dark : light;
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return this.getLuminance() > Misuzu.Colour.READABILITY_THRESHOLD ? dark : light;
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};
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