iegik
5/23/2015 - 6:55 PM
Color.js
var Color = function() {
this.r = this.g = this.b = 0;
this.h = this.s = this.l = 0;
this.a = 1;
};
/** RGB */
Color.prototype.cssRGB = function() {
return "rgb("+Math.round(255*this.r)+","+Math.round(255*this.g)+","+Math.round(255*this.b)+")";
};
Color.prototype.cssRGBA = function() {
return "rgba("+Math.round(255*this.r)+","+Math.round(255*this.g)+","+Math.round(255*this.b)+","+Math.round(this.a)+")";
};
Color.prototype.red = function() { return this.r; };
Color.prototype.green = function() { return this.g; };
Color.prototype.blue = function() { return this.b; };
/** HSL */
Color.prototype.cssHSL = function() {
return "hsl("+Math.round(360*this.h)+","+Math.round(100*this.s)+"%,"+Math.round(100*this.l)+"%)";
};
Color.prototype.cssHSLA = function() {
return "hsla("+Math.round(360*this.h)+","+Math.round(100*this.s)+"%,"+Math.round(100*this.l)+"%,"+Math.round(this.a)+")";
};
Color.prototype.hue = function() { return this.h; };
Color.prototype.saturation = function() { return this.s; };
Color.prototype.lightness = function() { return this.l; };
/** HEX */
Color.prototype.cssHEX = function() {
return "#" + ("000" + (this.r * 0x10000 + this.g * 0x100 + this.b).toString(16)).substr(-6);
}
/** Transparency */
Color.prototype.alpha = function() { return this.a; };
/** Modifiers */
Color.prototype.saturate = function(v) {
if("string" == typeof v && v.indexOf("%") > -1 && (v = parseInt(v)) != 'NaN')
this.s += v/100;
else if("number" == typeof v) // range 255
this.s += v/255;
else throw new Error("error: bad modifier format (percent or number)");
if(this.s > 1) this.s = 1; else if(this.s < 0) this.s = 0;
Color.Convertor.HSLToRGB.apply(this);
};
Color.prototype.desaturate = function(v) {
this.saturate("-" + v);
};
Color.prototype.lighten = function(v) {
if("string" == typeof v && v.indexOf("%") > -1 && (v = parseInt(v)) != 'NaN')
this.l += v/100;
else if("number" == typeof v) // range 255
this.l += v/255;
else throw new Error("error: bad modifier format (percent or number)");
if(this.l > 1) this.l = 1; else if(this.l < 0) this.l = 0;
Color.Convertor.HSLToRGB.apply(this);
};
Color.prototype.darken = function(v) {
this.ligthen("-" + v);
};
Color.prototype.fadein = function(v) {
if("string" == typeof v && v.indexOf("%") > -1 && (v = parseInt(v)) != 'NaN')
this.a += v/100;
else if("number" == typeof v) // range 255
this.a += v/255;
else throw new Error("error: bad modifier format (percent or number)");
if(this.a > 1) this.a = 1; else if(this.a < 0) this.a = 0;
Color.Convertor.HSLToRGB.apply(this);
};
Color.prototype.fadeout = function(v) {
this.fadein("-" + v);
};
Color.prototype.spin = function(v) {
if("string" == typeof v && v.indexOf("%") > -1 && (v = parseInt(v)) != 'NaN')
this.h += v/100;
else if("number" == typeof v) // range 360
this.h += v/360;
else throw new Error("error: bad modifier format (percent or number)");
if(this.h > 1) this.h = 1; else if(this.h < 0) this.h = 0;
Color.Convertor.HSLToRGB.apply(this);
};
/** Debug */
Color.prototype.toString = function() {
return "<span style=\"color: "+this.cssRGB()+"\">"+this.cssRGB()+"</span> / <span style=\"color: "+this.cssHSL()+"\">"+this.cssHSL()+"</span> / <span style=\"color: "+this.cssHEX()+"\">"+this.cssHEX()+"</span> / alpha: "+this.a+"";
};
Color.makeRGB = function() {
var c = new Color(),
sanitized;
if(arguments.length < 3 || arguments.length > 4)
throw new Error("error: 3 or 4 arguments");
sanitized = Color.Sanitizer.RGB(arguments[0], arguments[1], arguments[2]);
c.r = sanitized[0];
c.g = sanitized[1];
c.b = sanitized[2];
if(arguments.length == 4) c.a = arguments[3];
Color.Convertor.RGBToHSL.apply(c);
return c;
};
Color.makeHSL = function() {
var c = new Color(),
sanitized;
if(arguments.length < 3 || arguments.length > 4)
throw new Error("error: 3 or 4 arguments");
sanitized = Color.Sanitizer.HSL(arguments[0], arguments[1], arguments[2]);
c.h = sanitized[0];
c.s = sanitized[1];
c.l = sanitized[2];
if(arguments.length == 4) c.a = arguments[3];
Color.Convertor.HSLToRGB.apply(c);
return c;
};
Color.makeHEX = function(value) {
var c = new Color(),
sanitized;
Color.Validator.checkHEX(value);
if(value.length == 3) {
sanitized = Color.Sanitizer.RGB(
parseInt(value.substr(0, 1) + value.substr(0, 1), 16),
parseInt(value.substr(1, 1) + value.substr(1, 1), 16),
parseInt(value.substr(2, 1) + value.substr(2, 1), 16)
);
} else if(value.length == 6) {
sanitized = Color.Sanitizer.RGB(
parseInt(value.substr(0, 2), 16),
parseInt(value.substr(2, 2), 16),
parseInt(value.substr(4, 2), 16)
);
} else throw new Error("error: 3 or 6 arguments");
c.r = sanitized[0];
c.g = sanitized[1];
c.b = sanitized[2];
Color.Convertor.RGBToHSL.apply(c);
return c;
};
Color.Sanitizer = {
RGB: function() {
var o = [];
if(arguments.length == 0) return;
for(var i = 0 ; i < arguments.length ; i++) {
var c = arguments[i];
if("string" == typeof c && c.indexOf("%") > -1) {
if((c = parseInt(c)) == 'NaN')
throw new Error("Bad format");
if(c < 0 || c > 100)
throw new Error("Bad format");
o[i] = c/100;
} else {
if("string" == typeof c && (c = parseInt(c)) == 'NaN') throw new Error("Bad format");
if(c < 0) throw new Error("Bad format");
else if(c >= 0 && c < 1) o[i] = c;
else if(c >= 1 && c < 256) o[i] = c/255;
else throw new Error("Bad format");
}
}
return o;
},
HSL: function() {
if(arguments.length < 3 || arguments.length > 4) throw new Error("3 or 4 arguments required");
var h = arguments[0],
s = arguments[1],
l = arguments[2];
if("string" == typeof h && (h = parseFloat(h)) == 'NaN') throw new Error("Bad format for hue");
if(h < 0 || h > 360) throw new Error("Hue out of range (0..360)");
else if(((""+h).indexOf(".") > -1 && h > 1) || (""+h).indexOf(".") == -1) h /= 360;
if("string" == typeof s && s.indexOf("%") > -1) {
if((s = parseInt(s)) == 'NaN')
throw new Error("Bad format for saturation");
if(s < 0 || s > 100)
throw new Error("Bad format for saturation");
s /= 100;
} else if(s < 0 || s > 1) throw new Error("Bad format for saturation");
if("string" == typeof l && l.indexOf("%") > -1) {
if((l = parseInt(l)) == 'NaN')
throw new Error("Bad format for lightness");
if(l < 0 || l > 100)
throw new Error("Bad format for lightness");
l /= 100;
} else if(l < 0 || l > 1) throw new Error("Bad format for lightness");
return [h, s, l];
},
};
Color.Validator = {
/**
* Check a hexa color (without #)
*/
checkHEX: function(value) {
if(value.length != 6)
throw new Error("Hexa color: bad length");
value = value.toLowerCase();
for(i in value) {
var c = value.charCodeAt(i);
if( !((c>=49 && c<=57) || (c>=97 && c<=102)) )
throw new Error("Hexa color: out of range for " + value + " at position " + i);
}
},
};
Color.Convertor = {
/**
* Calculates HSL Color
* RGB must be normalized
* Must be executed in a Color object context
* http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
*/
RGBToHSL: function() {
//
var r = this.r,
g = this.g,
b = this.b,
max = Math.max(r, g, b), min = Math.min(r, g, b);
this.l = (max + min) / 2;
if(max == min){
this.h = this.s = 0; // achromatic
} else {
var d = max - min;
this.s = this.l > 0.5 ? d / (2 - max - min) : d / (max + min);
switch(max){
case r: this.h = (g - b) / d + (g < b ? 6 : 0); break;
case g: this.h = (b - r) / d + 2; break;
case b: this.h = (r - g) / d + 4; break;
}
this.h /= 6;
}
},
/**
* Calculates RGB color (nomalized)
* HSL must be normalized
* Must be executed in a Color object context
* http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
*/
HSLToRGB: function() {
var h = this.h,
s = this.s,
l = this.l,
hue2rgb = function(p, q, t){
if(t < 0) t += 1;
if(t > 1) t -= 1;
if(t < 1/6) return p + (q - p) * 6 * t;
if(t < 1/2) return q;
if(t < 2/3) return p + (q - p) * (2/3 - t) * 6;
return p;
};
if(s == 0) {
this.r = this.g = this.b = l; // achromatic
} else {
var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
var p = 2 * l - q;
this.r = hue2rgb(p, q, h + 1/3);
this.g = hue2rgb(p, q, h);
this.b = hue2rgb(p, q, h - 1/3);
}
},
};