anchor: love.graphics.inverseTransformPoint
  Converts the given 2D position from screen-space into global coordinates.
  
  This effectively applies the reverse of the current graphics transformations to the given position. A similar Transform:inverseTransformPoint method exists for Transform objects.
  globalX, globalY = love.graphics.inverseTransformPoint( screenX, screenY )
  screenX number The x component of the screen-space position.
  screenY number The y component of the screen-space position.
  globalX number The x component of the position in global coordinates.
  globalY number The y component of the position in global coordinates.