mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-13 21:34:51 +00:00
60 lines
1.6 KiB
JavaScript
60 lines
1.6 KiB
JavaScript
|
//--
|
||
|
|
//-- RGB colour object
|
||
|
|
//--
|
||
|
|
|
||
|
|
// Construct an RGB colour object from a '#rrggbb', '#rgb' or 'rgb(n,n,n)' string or from separate r,g,b values
|
||
|
|
function RGB(r,g,b)
|
||
|
|
{
|
||
|
|
this.r = 0;
|
||
|
|
this.g = 0;
|
||
|
|
this.b = 0;
|
||
|
|
if(typeof r == "string") {
|
||
|
|
if(r.substr(0,1) == "#") {
|
||
|
|
if(r.length == 7) {
|
||
|
|
this.r = parseInt(r.substr(1,2),16)/255;
|
||
|
|
this.g = parseInt(r.substr(3,2),16)/255;
|
||
|
|
this.b = parseInt(r.substr(5,2),16)/255;
|
||
|
|
} else {
|
||
|
|
this.r = parseInt(r.substr(1,1),16)/15;
|
||
|
|
this.g = parseInt(r.substr(2,1),16)/15;
|
||
|
|
this.b = parseInt(r.substr(3,1),16)/15;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
var rgbPattern = /rgb\s*\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*\)/;
|
||
|
|
var c = r.match(rgbPattern);
|
||
|
|
if(c) {
|
||
|
|
this.r = parseInt(c[1],10)/255;
|
||
|
|
this.g = parseInt(c[2],10)/255;
|
||
|
|
this.b = parseInt(c[3],10)/255;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
this.r = r;
|
||
|
|
this.g = g;
|
||
|
|
this.b = b;
|
||
|
|
}
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Mixes this colour with another in a specified proportion
|
||
|
|
// c = other colour to mix
|
||
|
|
// f = 0..1 where 0 is this colour and 1 is the new colour
|
||
|
|
// Returns an RGB object
|
||
|
|
RGB.prototype.mix = function(c,f)
|
||
|
|
{
|
||
|
|
return new RGB(this.r + (c.r-this.r) * f,this.g + (c.g-this.g) * f,this.b + (c.b-this.b) * f);
|
||
|
|
};
|
||
|
|
|
||
|
|
// Return an rgb colour as a #rrggbb format hex string
|
||
|
|
RGB.prototype.toString = function()
|
||
|
|
{
|
||
|
|
var clamp = function(x,min,max) {
|
||
|
|
return x < min ? min : (x > max ? max : x);
|
||
|
|
};
|
||
|
|
return "#" +
|
||
|
|
("0" + Math.floor(clamp(this.r,0,1) * 255).toString(16)).right(2) +
|
||
|
|
("0" + Math.floor(clamp(this.g,0,1) * 255).toString(16)).right(2) +
|
||
|
|
("0" + Math.floor(clamp(this.b,0,1) * 255).toString(16)).right(2);
|
||
|
|
};
|
||
|
|
|