lumpy circle

lumpycircle.js

function makecircle(r){
  return function(x,y){
    return Math.pow(x,2) + Math.pow(y,2) < Math.pow(r,2);
  }
}

function translate(tx, ty, func){
  return function(x,y){
    var xprime = x-tx;
    var yprime = y-ty;

    return func(xprime,yprime);
  }
}

function rotate(theta, func){
  return function(x,y){
    var xprime = Math.cos(theta)*x-Math.sin(theta)*y;
    var yprime = Math.sin(theta)*x+Math.cos(theta)*y;

    return func(xprime,yprime);
  }
}

function union(funcs){
  var metaargs=arguments;
  return function(x,y) {
    var ret=false;
    for(var i=0; i<metaargs.length;i++){
      ret = ret || metaargs[i](x,y);
    }
    return ret;
  }
}

function cut( pos, neg ){
  return function(x,y){ return pos(x,y) && !neg(x,y); };
}

function nothing(){
  return function(x,y){return false};
}

function scale(sx, sy, func){
  return function(x,y){
    return func(x/sx, y/sy);
  }
}

function dist(x,y){
 return Math.pow(Math.pow(x,2)+Math.pow(y,2),0.5);
}

function bulge(cx,cy,func){
  return function(x,y){
     var dd = (dist(x-cx,y-cy));
     var tt = Math.exp(-dd*0.2)*10;
     var xp = x-(tt);
     var yp = y-(tt);

    return func(xp,yp);
  }
}

emit( translate(250,250,
         scale(1.6,1.6,
           bulge(29,44,
             makecircle(50)
           )
         )
       ) );