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108 lines
3.5 KiB
C++
108 lines
3.5 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry (AGG) - Version 2.5
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// A high quality rendering engine for C++
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// Copyright (C) 2002-2006 Maxim Shemanarev
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://antigrain.com
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//
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// AGG is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// AGG is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with AGG; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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// MA 02110-1301, USA.
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//----------------------------------------------------------------------------
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#include "agg_vcgen_markers_term.h"
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namespace agg
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{
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//------------------------------------------------------------------------
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void vcgen_markers_term::remove_all()
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{
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m_markers.remove_all();
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}
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//------------------------------------------------------------------------
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void vcgen_markers_term::add_vertex(double x, double y, unsigned cmd)
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{
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if(is_move_to(cmd))
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{
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if(m_markers.size() & 1)
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{
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// Initial state, the first coordinate was added.
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// If two of more calls of start_vertex() occures
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// we just modify the last one.
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m_markers.modify_last(coord_type(x, y));
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}
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else
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{
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m_markers.add(coord_type(x, y));
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}
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}
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else
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{
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if(is_vertex(cmd))
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{
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if(m_markers.size() & 1)
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{
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// Initial state, the first coordinate was added.
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// Add three more points, 0,1,1,0
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m_markers.add(coord_type(x, y));
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m_markers.add(m_markers[m_markers.size() - 1]);
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m_markers.add(m_markers[m_markers.size() - 3]);
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}
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else
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{
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if(m_markers.size())
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{
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// Replace two last points: 0,1,1,0 -> 0,1,2,1
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m_markers[m_markers.size() - 1] = m_markers[m_markers.size() - 2];
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m_markers[m_markers.size() - 2] = coord_type(x, y);
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}
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}
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}
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}
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}
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//------------------------------------------------------------------------
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void vcgen_markers_term::rewind(unsigned path_id)
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{
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m_curr_id = path_id * 2;
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m_curr_idx = m_curr_id;
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}
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//------------------------------------------------------------------------
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unsigned vcgen_markers_term::vertex(double* x, double* y)
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{
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if(m_curr_id > 2 || m_curr_idx >= m_markers.size())
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{
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return path_cmd_stop;
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}
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const coord_type& c = m_markers[m_curr_idx];
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*x = c.x;
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*y = c.y;
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if(m_curr_idx & 1)
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{
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m_curr_idx += 3;
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return path_cmd_line_to;
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}
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++m_curr_idx;
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return path_cmd_move_to;
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}
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}
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