cmd=testPolyRayCPA

poly=0,0:10,0:10,10:0,10 rx=15 ry=5 ra=90  # cpa=5
poly=0,0:10,0:10,10:0,10 rx=15 ry=5 ra=0   # cpa=5
poly=0,0:10,0:10,10:0,10 rx=15 ry=5 ra=270 # cpa=0
poly=0,0:10,0:10,10:0,10 rx=15 ry=5 ra=315 # cpa=0