Geometry Stuff

gistfile1.js

// Quick and dirty function for calculating the interior angle
// of each bend of a polygon
var polySide = function(sides){
  return ((sides - 2) * 180) / sides;
}


// Another geometry bender
// expects starting coordinates
// to dome in a d3 friendly {x: x, y: y} array
var newCoord = function(coords, angle, length, rotation){
  var radian = Math.PI / 180,
      rotate = 0,
      x = coords.x,
      y = coords.y;
  
  var y1 = y + Math.sin((angle + rotation) * radian) * length;
  var x1 = x + Math.cos((angle + rotation) * radian) * length;
  
  return {x: x1, y: y1};
  
}

// Make fun shapes
var shaper = function(coords,sides, length){
  var angle = polySide(sides),
      ary = [coords];
  
  for(var i = 0; i < sides; i++ ){
    coords = newCoord(coords, angle, length, angle * i);
    ary.push(coords);
  }
  
  return ary;
  
}