Function crossProduct2Vector

core/math/Vec2.cpp:88–91

cross product of 2 vector. A->B X C->D

// cross product of 2 vector. A->B X C->D
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);
}

float Vec2::angle(const Vec2& v1, const Vec2& v2)
{