addition = point(P.xy())
addition += text('P', P.xy(), vertical_alignment = 'bottom', horizontal_alignment = 'right')
addition += point(Q.xy())
addition += text('Q', Q.xy(), vertical_alignment = 'top', horizontal_alignment = 'right')
PQ = P + Q
addition += point(PQ.xy())
addition += text('P + Q', PQ.xy(), vertical_alignment = 'bottom', horizontal_alignment = 'left')
addition.show()