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86 lines
2.8 KiB
C++
86 lines
2.8 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_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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