agg-2.5/include/agg_vpgen_clip_polygon.h

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//----------------------------------------------------------------------------
// Anti-Grain Geometry (AGG) - Version 2.5
// A high quality rendering engine for C++
// Copyright (C) 2002-2006 Maxim Shemanarev
// Contact: mcseem@antigrain.com
//          mcseemagg@yahoo.com
//          http://antigrain.com
// 
// AGG is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// 
// AGG is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with AGG; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
// MA 02110-1301, USA.
//----------------------------------------------------------------------------

#ifndef AGG_VPGEN_CLIP_POLYGON_INCLUDED
#define AGG_VPGEN_CLIP_POLYGON_INCLUDED

#include "agg_basics.h"

namespace agg
{

    //======================================================vpgen_clip_polygon
    //
    // See Implementation agg_vpgen_clip_polygon.cpp
    //
    class vpgen_clip_polygon
    {
    public:
        vpgen_clip_polygon() : 
            m_clip_box(0, 0, 1, 1),
            m_x1(0),
            m_y1(0),
            m_clip_flags(0),
            m_num_vertices(0),
            m_vertex(0),
            m_cmd(path_cmd_move_to)
        {
        }

        void clip_box(double x1, double y1, double x2, double y2)
        {
            m_clip_box.x1 = x1;
            m_clip_box.y1 = y1;
            m_clip_box.x2 = x2;
            m_clip_box.y2 = y2;
            m_clip_box.normalize();
        }


        double x1() const { return m_clip_box.x1; }
        double y1() const { return m_clip_box.y1; }
        double x2() const { return m_clip_box.x2; }
        double y2() const { return m_clip_box.y2; }

        static bool auto_close()   { return true;  }
        static bool auto_unclose() { return false; }

        void     reset();
        void     move_to(double x, double y);
        void     line_to(double x, double y);
        unsigned vertex(double* x, double* y);

    private:
        unsigned clipping_flags(double x, double y);

    private:
        rect_d        m_clip_box;
        double        m_x1;
        double        m_y1;
        unsigned      m_clip_flags;
        double        m_x[4];
        double        m_y[4];
        unsigned      m_num_vertices;
        unsigned      m_vertex;
        unsigned      m_cmd;
    };

}


#endif