104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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//
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// Terminal markers generator (arrowhead/arrowtail)
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//
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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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