Function isScreenPointInRect

core/2d/Node.cpp:2175–2221

}

bool isScreenPointInRect(const Vec2& pt, const Camera* camera, const Mat4& w2l, const Rect& rect, Vec3* p)
{
    if (nullptr == camera || rect.size.width <= 0 || rect.size.height <= 0)
    {
        return false;
    }

    // first, convert pt to near/far plane, get Pn and Pf
    Vec3 Pn(pt.x, pt.y, -1), Pf(pt.x, pt.y, 1);
    Pn = camera->unprojectGL(Pn);
    Pf = camera->unprojectGL(Pf);

    //  then convert Pn and Pf to node space
    w2l.transformPoint(&Pn);
    w2l.transformPoint(&Pf);

    // Pn and Pf define a line Q(t) = D + t * E which D = Pn
    auto E = Pf - Pn;

    // second, get three points which define content plane
    //  these points define a plane P(u, w) = A + uB + wC
    Vec3 A = Vec3(rect.origin.x, rect.origin.y, 0);
    Vec3 B(rect.origin.x + rect.size.width, rect.origin.y, 0);
    Vec3 C(rect.origin.x, rect.origin.y + rect.size.height, 0);
    B = B - A;
    C = C - A;

    //  the line Q(t) intercept with plane P(u, w)
    //  calculate the intercept point P = Q(t)
    //      (BxC).A - (BxC).D
    //  t = -----------------
    //          (BxC).E
    Vec3 BxC;
    Vec3::cross(B, C, &BxC);
    auto BxCdotE = BxC.dot(E);
    if (BxCdotE == 0)
    {
        return false;
    }
    auto t = (BxC.dot(A) - BxC.dot(Pn)) / BxCdotE;
    Vec3 P = Pn + t * E;
    if (p)
    {
        *p = P;
    }
    return rect.containsPoint(Vec2(P.x, P.y));
}

void Node::applyMaskOnEnter(bool applyChildren)
{