anchor: love.touch.getPressure
  Gets the current pressure of the specified touch-press.
  pressure = love.touch.getPressure( id )
  id light userdata The identifier of the touch-press. Use love.touch.getTouches, love.touchpressed, or love.touchmoved to obtain touch id values.
  pressure number The pressure of the touch-press. Most touch screens aren't pressure sensitive, in which case the pressure will be 1.