77 lines
2.2 KiB
C++
77 lines
2.2 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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#include "agg_vpgen_clip_polyline.h"
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#include "agg_clip_liang_barsky.h"
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namespace agg
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{
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//----------------------------------------------------------------------------
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void vpgen_clip_polyline::reset()
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{
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m_vertex = 0;
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m_num_vertices = 0;
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m_move_to = false;
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}
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//----------------------------------------------------------------------------
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void vpgen_clip_polyline::move_to(double x, double y)
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{
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m_vertex = 0;
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m_num_vertices = 0;
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m_x1 = x;
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m_y1 = y;
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m_move_to = true;
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}
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//----------------------------------------------------------------------------
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void vpgen_clip_polyline::line_to(double x, double y)
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{
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double x2 = x;
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double y2 = y;
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unsigned flags = clip_line_segment(&m_x1, &m_y1, &x2, &y2, m_clip_box);
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m_vertex = 0;
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m_num_vertices = 0;
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if((flags & 4) == 0)
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{
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if((flags & 1) != 0 || m_move_to)
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{
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m_x[0] = m_x1;
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m_y[0] = m_y1;
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m_cmd[0] = path_cmd_move_to;
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m_num_vertices = 1;
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}
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m_x[m_num_vertices] = x2;
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m_y[m_num_vertices] = y2;
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m_cmd[m_num_vertices++] = path_cmd_line_to;
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m_move_to = (flags & 2) != 0;
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}
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m_x1 = x;
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m_y1 = y;
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}
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//----------------------------------------------------------------------------
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unsigned vpgen_clip_polyline::vertex(double* x, double* y)
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{
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if(m_vertex < m_num_vertices)
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{
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*x = m_x[m_vertex];
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*y = m_y[m_vertex];
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return m_cmd[m_vertex++];
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}
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return path_cmd_stop;
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}
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}
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