dev_open_window(0, 0, 512, 512, 'black', WindowHandle)
*反选
*gen_circle(Circle, 200, 200, 100.5)
*dev_clear_window()
*complement(Circle,Regioncomplement)

gen_circle(Circle2, 200, 200, 100.5)
gen_circle(Circle1, 300, 200, 100.5)
*圆2的补集
*difference(Circle2, Circle1, RegionDifference)
*dev_display(RegionDifference)
*圆1圆2交集的补集
*symm_difference(Circle1, Circle2, RegionDifference1)
*dev_display(RegionDifference1)
*两元的交集
intersection(Circle1, Circle2, RegionIntersection)
dev_display(RegionIntersection)