anchor: love.graphics.setScissor
  Sets or disables scissor.
  
  The scissor limits the drawing area to a specified rectangle. This affects all graphics calls, including love.graphics.clear.
  
  The dimensions of the scissor is unaffected by graphical transformations (translate, scale, ...).
  love.graphics.setScissor( x, y, width, height )
  x number x coordinate of upper left corner.
  y number y coordinate of upper left corner.
  width number width of clipping rectangle.
  height number height of clipping rectangle.
  love.graphics.setScissor()