diff options
Diffstat (limited to 'agg/source/agg_vcgen_smooth_poly1.cpp')
| -rwxr-xr-x | agg/source/agg_vcgen_smooth_poly1.cpp | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/agg/source/agg_vcgen_smooth_poly1.cpp b/agg/source/agg_vcgen_smooth_poly1.cpp new file mode 100755 index 000000000000..1df1edb5c72c --- /dev/null +++ b/agg/source/agg_vcgen_smooth_poly1.cpp @@ -0,0 +1,226 @@ +//---------------------------------------------------------------------------- +// Anti-Grain Geometry - Version 2.3 +// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com) +// +// Permission to copy, use, modify, sell and distribute this software +// is granted provided this copyright notice appears in all copies. +// This software is provided "as is" without express or implied +// warranty, and with no claim as to its suitability for any purpose. +// +//---------------------------------------------------------------------------- +// Contact: mcseem@antigrain.com +// mcseemagg@yahoo.com +// http://www.antigrain.com +//---------------------------------------------------------------------------- +// +// Smooth polygon generator +// +//---------------------------------------------------------------------------- + +#include "agg_vcgen_smooth_poly1.h" + +namespace agg +{ + + //------------------------------------------------------------------------ + vcgen_smooth_poly1::vcgen_smooth_poly1() : + m_src_vertices(), + m_smooth_value(0.5), + m_closed(0), + m_status(initial), + m_src_vertex(0) + { + } + + + //------------------------------------------------------------------------ + void vcgen_smooth_poly1::remove_all() + { + m_src_vertices.remove_all(); + m_closed = 0; + m_status = initial; + } + + + //------------------------------------------------------------------------ + void vcgen_smooth_poly1::add_vertex(double x, double y, unsigned cmd) + { + m_status = initial; + if(is_move_to(cmd)) + { + m_src_vertices.modify_last(vertex_dist(x, y)); + } + else + { + if(is_vertex(cmd)) + { + m_src_vertices.add(vertex_dist(x, y)); + } + else + { + m_closed = get_close_flag(cmd); + } + } + } + + + //------------------------------------------------------------------------ + void vcgen_smooth_poly1::rewind(unsigned) + { + if(m_status == initial) + { + m_src_vertices.close(m_closed != 0); + } + m_status = ready; + m_src_vertex = 0; + } + + + //------------------------------------------------------------------------ + void vcgen_smooth_poly1::calculate(const vertex_dist& v0, + const vertex_dist& v1, + const vertex_dist& v2, + const vertex_dist& v3) + { + + double k1 = v0.dist / (v0.dist + v1.dist); + double k2 = v1.dist / (v1.dist + v2.dist); + + double xm1 = v0.x + (v2.x - v0.x) * k1; + double ym1 = v0.y + (v2.y - v0.y) * k1; + double xm2 = v1.x + (v3.x - v1.x) * k2; + double ym2 = v1.y + (v3.y - v1.y) * k2; + + m_ctrl1_x = v1.x + m_smooth_value * (v2.x - xm1); + m_ctrl1_y = v1.y + m_smooth_value * (v2.y - ym1); + m_ctrl2_x = v2.x + m_smooth_value * (v1.x - xm2); + m_ctrl2_y = v2.y + m_smooth_value * (v1.y - ym2); + } + + + //------------------------------------------------------------------------ + unsigned vcgen_smooth_poly1::vertex(double* x, double* y) + { + unsigned cmd = path_cmd_line_to; + while(!is_stop(cmd)) + { + switch(m_status) + { + case initial: + rewind(0); + + case ready: + if(m_src_vertices.size() < 2) + { + cmd = path_cmd_stop; + break; + } + + if(m_src_vertices.size() == 2) + { + *x = m_src_vertices[m_src_vertex].x; + *y = m_src_vertices[m_src_vertex].y; + m_src_vertex++; + if(m_src_vertex == 1) return path_cmd_move_to; + if(m_src_vertex == 2) return path_cmd_line_to; + cmd = path_cmd_stop; + break; + } + + cmd = path_cmd_move_to; + m_status = polygon; + m_src_vertex = 0; + + case polygon: + if(m_closed) + { + if(m_src_vertex >= m_src_vertices.size()) + { + *x = m_src_vertices[0].x; + *y = m_src_vertices[0].y; + m_status = end_poly; + return path_cmd_curve4; + } + } + else + { + if(m_src_vertex >= m_src_vertices.size() - 1) + { + *x = m_src_vertices[m_src_vertices.size() - 1].x; + *y = m_src_vertices[m_src_vertices.size() - 1].y; + m_status = end_poly; + return path_cmd_curve3; + } + } + + calculate(m_src_vertices.prev(m_src_vertex), + m_src_vertices.curr(m_src_vertex), + m_src_vertices.next(m_src_vertex), + m_src_vertices.next(m_src_vertex + 1)); + + *x = m_src_vertices[m_src_vertex].x; + *y = m_src_vertices[m_src_vertex].y; + m_src_vertex++; + + if(m_closed) + { + m_status = ctrl1; + return ((m_src_vertex == 1) ? + path_cmd_move_to : + path_cmd_curve4); + } + else + { + if(m_src_vertex == 1) + { + m_status = ctrl_b; + return path_cmd_move_to; + } + if(m_src_vertex >= m_src_vertices.size() - 1) + { + m_status = ctrl_e; + return path_cmd_curve3; + } + m_status = ctrl1; + return path_cmd_curve4; + } + // statement unreachable + //break; + + case ctrl_b: + *x = m_ctrl2_x; + *y = m_ctrl2_y; + m_status = polygon; + return path_cmd_curve3; + + case ctrl_e: + *x = m_ctrl1_x; + *y = m_ctrl1_y; + m_status = polygon; + return path_cmd_curve3; + + case ctrl1: + *x = m_ctrl1_x; + *y = m_ctrl1_y; + m_status = ctrl2; + return path_cmd_curve4; + + case ctrl2: + *x = m_ctrl2_x; + *y = m_ctrl2_y; + m_status = polygon; + return path_cmd_curve4; + + case end_poly: + m_status = stop; + return path_cmd_end_poly | m_closed; + + case stop: + return path_cmd_stop; + } + } + return cmd; + } + +} + |