oscillate

oscillate.jsx

/* 
name convention: 
[1,2,3,4]
["sin","cos","square","saw","tri"]
or
["sine","cosine","square",sawtooth","triangle"]
*/


function oscillate(w,f,a,t) {
    //Defaults
    if(!arguments[0]) w="sin";
    if(!arguments[1]) f=1;
    if(!arguments[2]) a=1;
    if(!arguments[3]) t=time;

    try {
        w=w.toString().toLowerCase();
        x=t*f;  

        switch(w){
            case "1": case "sin": case "sine":
                return Math.sin(2*Math.PI*x)*a;
            case "2": case "cos": case "cosine":
                return Math.cos(2*Math.PI*x)*a;
            case "3": case "square":
                return Math.floor(Math.sin(2*Math.PI*x))*a*2+a;
            case "4": case "saw": case "sawtooth":
                x=x*f+f/2;x<0?adj=a:adj=-a;
                return ((x%f)/f)*a*2+adj;
            case "5": case "tri": case "triangle":
                x=x*f-f/4;x<0?adj=a:adj=-a;
                return (Math.abs(((x%f)/f)*a*2+adj)-a/2)*2;
            default:
                return false;
        }
    } catch(e) {return false}
}
value + oscillate(w,f,a,t)