150 lines
4.4 KiB
C
150 lines
4.4 KiB
C
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//----------------------------------------------------------------------------
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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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// conv_marker
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_CONV_MARKER_INCLUDED
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#define AGG_CONV_MARKER_INCLUDED
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#include <cmath>
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#include "agg_basics.h"
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#include "agg_trans_affine.h"
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namespace agg
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{
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//-------------------------------------------------------------conv_marker
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template<class MarkerLocator, class MarkerShapes>
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class conv_marker
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{
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public:
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conv_marker(MarkerLocator& ml, MarkerShapes& ms);
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trans_affine& transform() { return m_transform; }
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const trans_affine& transform() const { return m_transform; }
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void rewind(unsigned path_id);
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unsigned vertex(double* x, double* y);
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private:
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conv_marker(const conv_marker<MarkerLocator, MarkerShapes>&);
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const conv_marker<MarkerLocator, MarkerShapes>&
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operator = (const conv_marker<MarkerLocator, MarkerShapes>&);
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enum status_e
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{
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initial,
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markers,
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polygon,
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stop
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};
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MarkerLocator* m_marker_locator;
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MarkerShapes* m_marker_shapes;
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trans_affine m_transform;
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trans_affine m_mtx;
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status_e m_status;
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unsigned m_marker;
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unsigned m_num_markers;
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};
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//------------------------------------------------------------------------
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template<class MarkerLocator, class MarkerShapes>
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conv_marker<MarkerLocator, MarkerShapes>::conv_marker(MarkerLocator& ml, MarkerShapes& ms) :
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m_marker_locator(&ml),
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m_marker_shapes(&ms),
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m_status(initial),
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m_marker(0),
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m_num_markers(1)
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{
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}
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//------------------------------------------------------------------------
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template<class MarkerLocator, class MarkerShapes>
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void conv_marker<MarkerLocator, MarkerShapes>::rewind(unsigned)
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{
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m_status = initial;
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m_marker = 0;
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m_num_markers = 1;
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}
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//------------------------------------------------------------------------
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template<class MarkerLocator, class MarkerShapes>
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unsigned conv_marker<MarkerLocator, MarkerShapes>::vertex(double* x, double* y)
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{
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unsigned cmd = path_cmd_move_to;
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double x1, y1, x2, y2;
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while(!is_stop(cmd))
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{
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switch(m_status)
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{
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case initial:
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if(m_num_markers == 0)
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{
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cmd = path_cmd_stop;
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break;
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}
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m_marker_locator->rewind(m_marker);
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++m_marker;
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m_num_markers = 0;
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m_status = markers;
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case markers:
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if(is_stop(m_marker_locator->vertex(&x1, &y1)))
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{
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m_status = initial;
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break;
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}
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if(is_stop(m_marker_locator->vertex(&x2, &y2)))
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{
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m_status = initial;
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break;
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}
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++m_num_markers;
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m_mtx = m_transform;
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m_mtx *= trans_affine_rotation(std::atan2(y2 - y1, x2 - x1));
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m_mtx *= trans_affine_translation(x1, y1);
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m_marker_shapes->rewind(m_marker - 1);
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m_status = polygon;
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case polygon:
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cmd = m_marker_shapes->vertex(x, y);
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if(is_stop(cmd))
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{
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cmd = path_cmd_move_to;
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m_status = markers;
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break;
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}
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m_mtx.transform(x, y);
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return cmd;
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case stop:
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cmd = path_cmd_stop;
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break;
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}
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}
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return cmd;
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}
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}
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#endif
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