libagg-dev 2.5+dfsg1-9 / usr / include / agg2 / agg_rasterizer_outline.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_RASTERIZER_OUTLINE_INCLUDED
#define AGG_RASTERIZER_OUTLINE_INCLUDED

#include "agg_basics.h"

namespace agg
{
    //======================================================rasterizer_outline
    template<class Renderer> class rasterizer_outline
    {
    public:
        explicit rasterizer_outline(Renderer& ren) : 
            m_ren(&ren), 
            m_start_x(0), 
            m_start_y(0), 
            m_vertices(0)
        {}
        void attach(Renderer& ren) { m_ren = &ren; }


        //--------------------------------------------------------------------
        void move_to(int x, int y)
        {
            m_vertices = 1;
            m_ren->move_to(m_start_x = x, m_start_y = y);
        }

        //--------------------------------------------------------------------
        void line_to(int x, int y)
        {
            ++m_vertices;
            m_ren->line_to(x, y);
        }

        //--------------------------------------------------------------------
        void move_to_d(double x, double y)
        {
            move_to(m_ren->coord(x), m_ren->coord(y));
        }

        //--------------------------------------------------------------------
        void line_to_d(double x, double y)
        {
            line_to(m_ren->coord(x), m_ren->coord(y));
        }

        //--------------------------------------------------------------------
        void close()
        {
            if(m_vertices > 2)
            {
                line_to(m_start_x, m_start_y);
            }
            m_vertices = 0;
        }

        //--------------------------------------------------------------------
        void add_vertex(double x, double y, unsigned cmd)
        {
            if(is_move_to(cmd)) 
            {
                move_to_d(x, y);
            }
            else 
            {
                if(is_end_poly(cmd))
                {
                    if(is_closed(cmd)) close();
                }
                else
                {
                    line_to_d(x, y);
                }
            }
        }


        //--------------------------------------------------------------------
        template<class VertexSource>
        void add_path(VertexSource& vs, unsigned path_id=0)
        {
            double x;
            double y;

            unsigned cmd;
            vs.rewind(path_id);
            while(!is_stop(cmd = vs.vertex(&x, &y)))
            {
                add_vertex(x, y, cmd);
            }
        }


        //--------------------------------------------------------------------
        template<class VertexSource, class ColorStorage, class PathId>
        void render_all_paths(VertexSource& vs, 
                              const ColorStorage& colors, 
                              const PathId& path_id,
                              unsigned num_paths)
        {
            for(unsigned i = 0; i < num_paths; i++)
            {
                m_ren->line_color(colors[i]);
                add_path(vs, path_id[i]);
            }
        }


        //--------------------------------------------------------------------
        template<class Ctrl> void render_ctrl(Ctrl& c)
        {
            unsigned i;
            for(i = 0; i < c.num_paths(); i++)
            {
                m_ren->line_color(c.color(i));
                add_path(c, i);
            }
        }


    private:
        Renderer* m_ren;
        int       m_start_x;
        int       m_start_y;
        unsigned  m_vertices;
    };


}


#endif

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