68 lines
1.9 KiB
C++
68 lines
1.9 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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#include <cmath>
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#include "agg_vpgen_segmentator.h"
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namespace agg
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{
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void vpgen_segmentator::move_to(double x, double y)
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{
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m_x1 = x;
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m_y1 = y;
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m_dx = 0.0;
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m_dy = 0.0;
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m_dl = 2.0;
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m_ddl = 2.0;
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m_cmd = path_cmd_move_to;
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}
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void vpgen_segmentator::line_to(double x, double y)
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{
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m_x1 += m_dx;
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m_y1 += m_dy;
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m_dx = x - m_x1;
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m_dy = y - m_y1;
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double len = std::sqrt(m_dx * m_dx + m_dy * m_dy) * m_approximation_scale;
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if(len < 1e-30) len = 1e-30;
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m_ddl = 1.0 / len;
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m_dl = (m_cmd == path_cmd_move_to) ? 0.0 : m_ddl;
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if(m_cmd == path_cmd_stop) m_cmd = path_cmd_line_to;
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}
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unsigned vpgen_segmentator::vertex(double* x, double* y)
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{
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if(m_cmd == path_cmd_stop) return path_cmd_stop;
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unsigned cmd = m_cmd;
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m_cmd = path_cmd_line_to;
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if(m_dl >= 1.0 - m_ddl)
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{
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m_dl = 1.0;
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m_cmd = path_cmd_stop;
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*x = m_x1 + m_dx;
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*y = m_y1 + m_dy;
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return cmd;
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}
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*x = m_x1 + m_dx * m_dl;
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*y = m_y1 + m_dy * m_dl;
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m_dl += m_ddl;
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return cmd;
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}
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}
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