anchor: love.physics.newEdgeShape
  Creates a new EdgeShape.
  shape = love.physics.newEdgeShape( x1, y1, x2, y2 )
  x1 number The x position of the first point.
  y1 number The y position of the first point.
  x2 number The x position of the second point.
  y2 number The y position of the second point.
  shape EdgeShape The new shape.