C++ (Cpp) Ellipse Exemples

Exemple #1

Fichier : NXViewFrustum.cpp Projet : MandyMo/NXEngine

bool NX::ViewFrustum::Visible(const NX::Ellipse &ellipse,            const unsigned int mask){
    const NX::vector<float, 3> R = ellipse.GetLongAxis()  * ellipse.GetLongAxisLength();
    const NX::vector<float, 3> S = ellipse.GetShortAxis() * ellipse.GetShortAxisLength();
    const NX::vector<float, 3> C = ellipse.GetCenter();
#undef NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST
#define NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(plane) \
    const NX::vector<float, 3> N = plane.GetNormal();\
    const float rn = NX::Dot(R, N);\
    const float rs = NX::Dot(S, N);\
    const float RRef = std::sqrt(rn * rn + rs * rs);\
    if(NX::Dot(N, C) + plane.GetDistFromOriginal() < -RRef){\
        return false;\
    }
    
    if(mask & NX::VF_VT_LEFT){
        NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(GetLeftPlane());
    }
    
    if(mask & NX::VF_VT_RIGHT){
        NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(GetRightPlane());
    }
    
    if(mask & NX::VF_VT_FRONT){
        NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(GetFrontPlane());
    }
    
    if(mask & NX::VF_VT_BACK){
        NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(GetBackPlane());
    }
    
    if(mask & NX::VF_VT_TOP){
        NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(GetTopPlane());
    }
    
    if(mask & NX::VF_VT_BOTTOM){
        NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(GetBottomPlane());
    }
    return true;
    
#undef NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST
}