agg-2.5/include/agg_vcgen_dash.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_VCGEN_DASH_INCLUDED
#define AGG_VCGEN_DASH_INCLUDED

#include "agg_basics.h"
#include "agg_vertex_sequence.h"

namespace agg
{

    //---------------------------------------------------------------vcgen_dash
    //
    // See Implementation agg_vcgen_dash.cpp
    //
    class vcgen_dash
    {
        enum max_dashes_e
        {
            max_dashes = 32
        };

        enum status_e
        {
            initial,
            ready,
            polyline,
            stop
        };

    public:
        typedef vertex_sequence<vertex_dist, 6> vertex_storage;

        vcgen_dash();

        void remove_all_dashes();
        void add_dash(double dash_len, double gap_len);
        void dash_start(double ds);

        void shorten(double s) { m_shorten = s; }
        double shorten() const { return m_shorten; }

        // Vertex Generator Interface
        void remove_all();
        void add_vertex(double x, double y, unsigned cmd);

        // Vertex Source Interface
        void     rewind(unsigned path_id);
        unsigned vertex(double* x, double* y);

    private:
        vcgen_dash(const vcgen_dash&);
        const vcgen_dash& operator = (const vcgen_dash&);

        void calc_dash_start(double ds);

        double             m_dashes[max_dashes];
        double             m_total_dash_len;
        unsigned           m_num_dashes;
        double             m_dash_start;
        double             m_shorten;
        double             m_curr_dash_start;
        unsigned           m_curr_dash;
        double             m_curr_rest;
        const vertex_dist* m_v1;
        const vertex_dist* m_v2;

        vertex_storage m_src_vertices;
        unsigned       m_closed;
        status_e       m_status;
        unsigned       m_src_vertex;
    };


}

#endif