//---------------------------------------------------------------------------- // Anti-Grain Geometry (AGG) - Version 2.5 // A high quality rendering engine for C++ // Copyright (C) 2002-2006 Maxim Shemanarev // Contact: mcseem@antigrain.com // mcseemagg@yahoo.com // http://antigrain.com // // AGG is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // AGG is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with AGG; if not, write to the Free Software // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, // MA 02110-1301, USA. //---------------------------------------------------------------------------- #include "agg_vpgen_clip_polyline.h" #include "agg_clip_liang_barsky.h" namespace agg { //---------------------------------------------------------------------------- void vpgen_clip_polyline::reset() { m_vertex = 0; m_num_vertices = 0; m_move_to = false; } //---------------------------------------------------------------------------- void vpgen_clip_polyline::move_to(double x, double y) { m_vertex = 0; m_num_vertices = 0; m_x1 = x; m_y1 = y; m_move_to = true; } //---------------------------------------------------------------------------- void vpgen_clip_polyline::line_to(double x, double y) { double x2 = x; double y2 = y; unsigned flags = clip_line_segment(&m_x1, &m_y1, &x2, &y2, m_clip_box); m_vertex = 0; m_num_vertices = 0; if((flags & 4) == 0) { if((flags & 1) != 0 || m_move_to) { m_x[0] = m_x1; m_y[0] = m_y1; m_cmd[0] = path_cmd_move_to; m_num_vertices = 1; } m_x[m_num_vertices] = x2; m_y[m_num_vertices] = y2; m_cmd[m_num_vertices++] = path_cmd_line_to; m_move_to = (flags & 2) != 0; } m_x1 = x; m_y1 = y; } //---------------------------------------------------------------------------- unsigned vpgen_clip_polyline::vertex(double* x, double* y) { if(m_vertex < m_num_vertices) { *x = m_x[m_vertex]; *y = m_y[m_vertex]; return m_cmd[m_vertex++]; } return path_cmd_stop; } } |