Color.js

function Color(...a){
    while(a.length&&typeof a[a.length-1]=='undefined')a.pop();
    this.r=0;
    this.g=0;
    this.b=0;
    this.a=0;
    if(a.length){
        if(typeof a[0]=='string'){
            a=a[0].toLowerCase();
            if(a[0]=='#')switch((a=a.substr(1)).length){
                    case 1:
                    this.set(new Color('#'+a+a));
                    break;
                case 2:
                    this.set(new Color('#'+a+a+a));
                    break;
                case 3:
                    this.set(new Color('#'+a[0]+a[0]+a[1]+a[1]+a[2]+a[2]));
                    break;
                case 4:
                    this.set(new Color('#'+a+a));
                    break;
                case 6:
                    this.set(new Color('#'+a+'00'));
                    break;
                case 8:
                    var b = [];
                    for(var i of a)b.push(Color.hex.indexOf(i));
                    this.r=b[0]*16+b[1];
                    this.g=b[2]*16+b[3];
                    this.b=b[4]*16+b[5];
                    this.a=b[6]*16+b[7];
                    break;
                default:console.error('Bad string passed in Color');
            } else if(a.substr(0,3)=='rgb'){
                var b = parseFloat,c=a[3]=='a';
                a=a.split('(')[1].split(',');
                this.r=b(a[0]);
                this.g=b(a[1]);
                this.b=b(a[2]);
                if(c)this.a=b(a[3]);
            } else console.error('Bad string passed in Color');
        } else if(typeof a[0]=='object'){
            a=a[0];
            if(a.constructor==Array)this.set(new Color(a[0],a[1],a[2],a[3]));
            else if(a.constructor==Color)this.set(a.r,a.g,a.b,a.a);
        } else if(+a[0]==a[0]){
            this.r=+a[0]||0;
            this.g=+a[1]||0;
            this.b=+a[2]||0;
            this.a=+a[3]||0;
        } else {
            console.error('Bad arguments passed in Color');
        }
    }
}
Color.prototype.blend=function blend(a,b,c,d){
    a=new Color(a,b,c,d);
    return new Color((this.r+a.r)/2,(this.g+a.g)/2,(this.b+a.b)/2,(this.a+a.a)/2);
}
Color.prototype.set=function set(a){
    this.r=a.r;
    this.g=a.g;
    this.b=a.b;
    this.a=a.a;
}
Color.prototype.get=function get(){
    return['rbga('+this.r,this.g,this.b,this.a/255+')'].join(',');
}
Color.hex='0123456789abcdef';
Color.create=function create(a,b,c,d){return new Color(a,b,c,d);}
Color.blend=function(a,b){return new Color(a).blend(b);}
Color.prototype.max = function(a,b,c,d){
    a=new Color(a,b,c,d);
    b=Math.max;
    return new Color().set(b(a.r,this.r,255),b(a.g,this.g,255),b(a.b,this.b,255),b(a.a,this.a,255));
}