float crossProduct2Vector(const Vec2& A, const Vec2& B, const Vec2& C, const Vec2& D)
{
return (D.y - C.y) * (B.x - A.x) - (D.x - C.x) * (B.y - A.y);
}
这个计算的结果是什么含义？
float crossProduct2Vector(const Vec2& A, const Vec2& B, const Vec2& C, const Vec2& D)
{
return (D.y - C.y) * (B.x - A.x) - (D.x - C.x) * (B.y - A.y);
}
这个计算的结果是什么含义？