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https://github.com/Jermolene/TiddlyWiki5
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60 lines
1.6 KiB
JavaScript
60 lines
1.6 KiB
JavaScript
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//--
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//-- RGB colour object
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//--
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// Construct an RGB colour object from a '#rrggbb', '#rgb' or 'rgb(n,n,n)' string or from separate r,g,b values
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function RGB(r,g,b)
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{
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this.r = 0;
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this.g = 0;
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this.b = 0;
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if(typeof r == "string") {
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if(r.substr(0,1) == "#") {
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if(r.length == 7) {
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this.r = parseInt(r.substr(1,2),16)/255;
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this.g = parseInt(r.substr(3,2),16)/255;
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this.b = parseInt(r.substr(5,2),16)/255;
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} else {
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this.r = parseInt(r.substr(1,1),16)/15;
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this.g = parseInt(r.substr(2,1),16)/15;
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this.b = parseInt(r.substr(3,1),16)/15;
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}
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} else {
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var rgbPattern = /rgb\s*\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*\)/;
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var c = r.match(rgbPattern);
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if(c) {
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this.r = parseInt(c[1],10)/255;
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this.g = parseInt(c[2],10)/255;
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this.b = parseInt(c[3],10)/255;
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}
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}
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} else {
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this.r = r;
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this.g = g;
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this.b = b;
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}
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return this;
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}
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// Mixes this colour with another in a specified proportion
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// c = other colour to mix
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// f = 0..1 where 0 is this colour and 1 is the new colour
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// Returns an RGB object
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RGB.prototype.mix = function(c,f)
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{
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return new RGB(this.r + (c.r-this.r) * f,this.g + (c.g-this.g) * f,this.b + (c.b-this.b) * f);
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};
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// Return an rgb colour as a #rrggbb format hex string
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RGB.prototype.toString = function()
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{
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var clamp = function(x,min,max) {
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return x < min ? min : (x > max ? max : x);
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};
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return "#" +
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("0" + Math.floor(clamp(this.r,0,1) * 255).toString(16)).right(2) +
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("0" + Math.floor(clamp(this.g,0,1) * 255).toString(16)).right(2) +
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("0" + Math.floor(clamp(this.b,0,1) * 255).toString(16)).right(2);
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};
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