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| #include <math.h> |
| #include "agg_vcgen_stroke.h" |
| #include "agg_shorten_path.h" |
|
|
| namespace agg |
| { |
|
|
| |
| vcgen_stroke::vcgen_stroke() : |
| m_stroker(), |
| m_src_vertices(), |
| m_out_vertices(), |
| m_shorten(0.0), |
| m_closed(0), |
| m_status(initial), |
| m_src_vertex(0), |
| m_out_vertex(0) |
| { |
| } |
|
|
| |
| void vcgen_stroke::remove_all() |
| { |
| m_src_vertices.remove_all(); |
| m_closed = 0; |
| m_status = initial; |
| } |
|
|
|
|
| |
| void vcgen_stroke::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_stroke::rewind(unsigned) |
| { |
| if(m_status == initial) |
| { |
| m_src_vertices.close(m_closed != 0); |
| shorten_path(m_src_vertices, m_shorten, m_closed); |
| if(m_src_vertices.size() < 3) m_closed = 0; |
| } |
| m_status = ready; |
| m_src_vertex = 0; |
| m_out_vertex = 0; |
| } |
|
|
|
|
| |
| unsigned vcgen_stroke::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 = m_closed ? outline1 : cap1; |
| cmd = path_cmd_move_to; |
| m_src_vertex = 0; |
| m_out_vertex = 0; |
| break; |
|
|
| case cap1: |
| m_stroker.calc_cap(m_out_vertices, |
| m_src_vertices[0], |
| m_src_vertices[1], |
| m_src_vertices[0].dist); |
| m_src_vertex = 1; |
| m_prev_status = outline1; |
| m_status = out_vertices; |
| m_out_vertex = 0; |
| break; |
|
|
| case cap2: |
| m_stroker.calc_cap(m_out_vertices, |
| m_src_vertices[m_src_vertices.size() - 1], |
| m_src_vertices[m_src_vertices.size() - 2], |
| m_src_vertices[m_src_vertices.size() - 2].dist); |
| m_prev_status = outline2; |
| m_status = out_vertices; |
| m_out_vertex = 0; |
| break; |
|
|
| case outline1: |
| if(m_closed) |
| { |
| if(m_src_vertex >= m_src_vertices.size()) |
| { |
| m_prev_status = close_first; |
| m_status = end_poly1; |
| break; |
| } |
| } |
| else |
| { |
| if(m_src_vertex >= m_src_vertices.size() - 1) |
| { |
| m_status = cap2; |
| break; |
| } |
| } |
| m_stroker.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_src_vertex; |
| m_prev_status = m_status; |
| m_status = out_vertices; |
| m_out_vertex = 0; |
| break; |
|
|
| case close_first: |
| m_status = outline2; |
| cmd = path_cmd_move_to; |
|
|
| case outline2: |
| if(m_src_vertex <= unsigned(m_closed == 0)) |
| { |
| m_status = end_poly2; |
| m_prev_status = stop; |
| break; |
| } |
|
|
| --m_src_vertex; |
| m_stroker.calc_join(m_out_vertices, |
| m_src_vertices.next(m_src_vertex), |
| m_src_vertices.curr(m_src_vertex), |
| m_src_vertices.prev(m_src_vertex), |
| m_src_vertices.curr(m_src_vertex).dist, |
| m_src_vertices.prev(m_src_vertex).dist); |
|
|
| m_prev_status = m_status; |
| m_status = out_vertices; |
| m_out_vertex = 0; |
| break; |
|
|
| case out_vertices: |
| if(m_out_vertex >= m_out_vertices.size()) |
| { |
| m_status = m_prev_status; |
| } |
| else |
| { |
| const point_d& c = m_out_vertices[m_out_vertex++]; |
| *x = c.x; |
| *y = c.y; |
| return cmd; |
| } |
| break; |
|
|
| case end_poly1: |
| m_status = m_prev_status; |
| return path_cmd_end_poly | path_flags_close | path_flags_ccw; |
|
|
| case end_poly2: |
| m_status = m_prev_status; |
| return path_cmd_end_poly | path_flags_close | path_flags_cw; |
|
|
| case stop: |
| cmd = path_cmd_stop; |
| break; |
| } |
| } |
| return cmd; |
| } |
|
|
| } |
|
|
