circle

circle.js

//demo of the interactive pointer

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(x*x+y*y,0.5);
}

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

function maketranscircle( p1,p2 ){
  var r = dist(p1[0]-p2[0],p1[1]-p2[1])*1.3;
  return translate(p1[0],p1[1],makecircle(r) );
}

function xor(func1, func2){
  return function(x,y){
    var f1 = func1(x,y);
    var f2 = func2(x,y);

    return (f1 || f2) && !(f1 && f2)
  }
}

function or(func1,func2){
  return function(x,y){
    var f1 = func1(x,y);
    var f2 = func2(x,y);

    return (f1 || f2);
  }
}

var meetup=[206,175];

emit(
  xor(
    xor( 
      maketranscircle([122,201],meetup), 
      maketranscircle([221,82],meetup) 
    ), 
    maketranscircle([299,202],meetup)
  )
);