 dfh.Universe = class Universe
   # default initialization parameters
   defaults: ->
-    torus: true
+    torus:  true
     width:  500
     height: 500
     cell:   20

    h = @height
    if x - radius < 0 || x + radius >= w || y - radius < 0 || y + radius >= h
      if @torus
        map points, (p) -> [ ( p[0] + w ) %% w, ( p[1] + h ) %% h ]
      else
        grep points, (p) -> 0 <= p[0] < w && 0 <= p[1] < h
    else

    w = @universe.width
    h = @universe.height
    if @universe.torus
      x = x %% w
      y = y %% h
    else
      if x < 0
        x *= -1
