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Diffstat (limited to 'agg/source/agg_vcgen_contour.cpp')
| -rwxr-xr-x | agg/source/agg_vcgen_contour.cpp | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/agg/source/agg_vcgen_contour.cpp b/agg/source/agg_vcgen_contour.cpp new file mode 100755 index 000000000000..979407417e75 --- /dev/null +++ b/agg/source/agg_vcgen_contour.cpp @@ -0,0 +1,191 @@ +//---------------------------------------------------------------------------- +// 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 +//---------------------------------------------------------------------------- +// +// Contour generator +// +//---------------------------------------------------------------------------- + +#include <math.h> +#include "agg_vcgen_contour.h" + +namespace agg +{ + + //------------------------------------------------------------------------ + vcgen_contour::vcgen_contour() : + m_src_vertices(), + m_out_vertices(), + m_width(1.0), + m_line_join(bevel_join), + m_inner_line_join(miter_join_revert), + m_approx_scale(1.0), + m_abs_width(1.0), + m_signed_width(1.0), + m_miter_limit(4.0), + m_inner_miter_limit(1.0 + 1.0/64.0), + m_status(initial), + m_src_vertex(0), + m_closed(0), + m_orientation(0), + m_auto_detect(false) + { + } + + + //------------------------------------------------------------------------ + void vcgen_contour::remove_all() + { + m_src_vertices.remove_all(); + m_closed = 0; + m_orientation = 0; + m_abs_width = fabs(m_width); + m_signed_width = m_width; + m_status = initial; + } + + + //------------------------------------------------------------------------ + void vcgen_contour::miter_limit_theta(double t) + { + m_miter_limit = 1.0 / sin(t * 0.5) ; + } + + + //------------------------------------------------------------------------ + void vcgen_contour::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 + { + if(is_end_poly(cmd)) + { + m_closed = get_close_flag(cmd); + if(m_orientation == path_flags_none) + { + m_orientation = get_orientation(cmd); + } + } + } + } + } + + + //------------------------------------------------------------------------ + void vcgen_contour::rewind(unsigned) + { + if(m_status == initial) + { + m_src_vertices.close(true); + m_signed_width = m_width; + if(m_auto_detect) + { + if(!is_oriented(m_orientation)) + { + m_orientation = (calc_polygon_area(m_src_vertices) > 0.0) ? + path_flags_ccw : + path_flags_cw; + } + } + if(is_oriented(m_orientation)) + { + m_signed_width = is_ccw(m_orientation) ? m_width : -m_width; + } + } + m_status = ready; + m_src_vertex = 0; + } + + + //------------------------------------------------------------------------ + unsigned vcgen_contour::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 + unsigned(m_closed != 0)) + { + cmd = path_cmd_stop; + break; + } + m_status = outline; + cmd = path_cmd_move_to; + m_src_vertex = 0; + m_out_vertex = 0; + + case outline: + if(m_src_vertex >= m_src_vertices.size()) + { + m_status = end_poly; + break; + } + stroke_calc_join(m_out_vertices, + m_src_vertices.prev(m_src_vertex), + m_src_vertices.curr(m_src_vertex), + m_src_vertices.next(m_src_vertex), + m_src_vertices.prev(m_src_vertex).dist, + m_src_vertices.curr(m_src_vertex).dist, + m_signed_width, + m_line_join, + m_inner_line_join, + m_miter_limit, + m_inner_miter_limit, + m_approx_scale); + ++m_src_vertex; + m_status = out_vertices; + m_out_vertex = 0; + + case out_vertices: + if(m_out_vertex >= m_out_vertices.size()) + { + m_status = outline; + } + else + { + const point_type& c = m_out_vertices[m_out_vertex++]; + *x = c.x; + *y = c.y; + return cmd; + } + break; + + case end_poly: + if(!m_closed) return path_cmd_stop; + m_status = stop; + return (unsigned)path_cmd_end_poly | (unsigned)path_flags_close | (unsigned)path_flags_ccw; + + case stop: + return path_cmd_stop; + } + } + return cmd; + } + +} |