     @position ?= {X: 0, Y: 0}
     @velocity ?= 1.0
     @angle = Math.random() * (2 * Math.PI)
+    @radius ?= 2
 
   toString: =>
     JSON.stringify

      when X >= 0 and Y >= 0 then 1
      when X < 0 and Y < 0 then 2
      when X >= 0 and Y < 0 then 3


# Some vector calculations, based on http://stackoverflow.com/a/573206

    @rocket.position.X = @rocket.position.X + xDelta
    @rocket.position.Y = @rocket.position.Y + yDelta

    # Test if rocket is out of bounds
    outOfBounds = @arena.rocketOutOfBounds(@rocket)

    # Sum player contributions
    maxAngle = Math.PI / 32
    angleDelta = 0.0
