Introduction - If you have any usage issues, please Google them yourself
Seeking two circles intersect area radius Q ar, br, two round Heart distance is d if ar+ br < d return 0 two circles from else if (fabs (ar-br),> d return area (min (ar , br)) of two circles covering else the two circles intersect can know the focus and center of the circle of the two circles intersect to form a quadrilateral, constitute then a fan-shaped area is S = a fan-shaped area of + b fan-shaped area- the quadrilateral area of intersection with each round heart