simple x and y cords for a circle

circle.js

function circle (radius, x, y, nPoints) {
  var circle = [];
  var nPoints = nPoints || 360;
  var wedge = 2 * Math.PI / nPoints;

  for (var angle = wedge; angle < 2 * Math.PI; angle += wedge) {  
    circle.push({ 
      x: x + radius * Math.cos(angle), 
      y: y + radius * Math.sin(angle) 
    });
  }
  return circle;
}