Exemplos de Clipper em C++ (Cpp)

Exemplo n.º 1

Arquivo: LKSurface.cpp Projeto: LK8000/LK8000

void LKSurface::Polyline(const POINT *apt, int cpt, const RECT& ClipRect) {
    if(cpt >= 2) {
        POINT Line[2];
        const POINT * Start = NULL;
        size_t n=0;

        LKGeom::clipper<POINT> Clipper((POINT) {ClipRect.left, ClipRect.top}, (POINT) {ClipRect.right, ClipRect.bottom});
        
        const POINT * const ItFirst = std::next(apt);
        const POINT * const ItLast = std::next(apt, cpt);

        Line[0] = *(apt);
        for(const POINT * It = ItFirst; It != ItLast; ++It) {
            Line[1] = *(It);
            const unsigned j = Clipper.ClipLine(Line[0], Line[1]);
            if(j&LKGeom::clipper<POINT>::_SEGM) {
                if(j&LKGeom::clipper<POINT>::_CLIP) {
                    if(Start && n > 1) {
                        Polyline(Start, n);
                        Start = NULL;
                        n=0;
                    }
                    Polyline(Line, 2);
                } else {
                    if(!Start) {
                        Start = std::prev(It);
                        n = 2;
                    } else {
                        ++n;
                    }
                }
            }
            Line[0] = *(It);
        }
        if(Start) {
            Polyline(Start, n);
        }
    }
}

Exemplo n.º 2

Arquivo: LKSurface.cpp Projeto: acasadoalonso/LK8000

void LKSurface::Polyline(const POINT *apt, int cpt, const RECT& ClipRect) {
    if(cpt >= 2) {
        POINT Line[2];
        const POINT * It = apt;
        const POINT * Start = NULL;
        size_t n=0;

        LKGeom::clipper<POINT> Clipper((POINT) {ClipRect.left, ClipRect.top}, (POINT) {ClipRect.right, ClipRect.bottom});
        
        Line[0] = *(It++);
        while ( It < apt+cpt) {
            Line[1] = *(It);
            unsigned j = Clipper.ClipLine(Line[0], Line[1]);
            if(j&LKGeom::clipper<POINT>::_SEGM) {
                if(j&LKGeom::clipper<POINT>::_CLIP) {
                    if(Start && n > 1) {
                        Polyline(Start, n);
                        Start = NULL;
                        n=0;
                    }
                    Polyline(Line, 2);
                } else {
                    if(!Start) {
                        Start = It-1;
                        n = 2;
                    } else {
                        ++n;
                    }
                }
            }
            Line[0] = *(It++);
        }
        if(Start) {
            Polyline(Start, n);
        }
    }
}