g2.y
g2.x
g1.y
g1.x
g2.y
g2.x
g1.y
g1.x
g2.y
g2.x
g1.y
g1.x
g2.y
g2.x
g1.y
g1.x
g2.y
g2.x
g1.y
g1.x
g2.y
g2.x
g1.y
g1.x
Descartes