bulge spiral

bulgespiral.js

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

   return func(xprime,yprime);
 }
}

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

function spiral(a, func){
 return function(x,y){
   var tt = dist(x,y)*a;

   var xprime = Math.cos(tt)*x-Math.sin(tt)*y;
   var yprime = Math.sin(tt)*x+Math.cos(tt)*y;

   return func(xprime,yprime);
 }
}

function bulge(a,func){
 return function(x,y){
   var tt = dist(x,y)*a;
   var xp = tt*x;
   var yp = tt*y;

   return func(xp,yp);
 }
}

function makeline(width){
 return function(x,y){
   return y<width/2 && y > -width/2;
 }
}

function foobar(x,y){
 return translate(150,150,
          scale(3,3,
            bulge(0.001,
            spiral(0.03,
              makeline(40)
            ))
          )
        );
}

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

emit( foobar() );

you should use http://bl.ocks.org to render these