| |
| //---------------------------------------------------------------------------- |
| // XYQ: 2006-01-22 Copied from AGG project. |
| // TODO: This file uses intensive floating point operations, so it's NOT suitable |
| // for platforms like Symbian OS. We need to change to FIX format. |
| //---------------------------------------------------------------------------- |
| //---------------------------------------------------------------------------- |
| // 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 |
| //---------------------------------------------------------------------------- |
| // |
| // Stroke generator |
| // |
| //---------------------------------------------------------------------------- |
| |
| #include "agg_vcgen_stroke.h" |
| |
| namespace agg |
| { |
| |
| vcgen_stroke::vcgen_stroke() : |
| m_src_vertices(), |
| m_out_vertices(), |
| m_width(0.5f), |
| m_miter_limit(4 * 1.0f), |
| m_inner_miter_limit(1.0f + 1.0f / 100), |
| m_approx_scale(1.0f), |
| m_line_cap(butt_cap), |
| m_line_join(miter_join), |
| m_inner_join(inner_miter), |
| 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(float x, float y, unsigned cmd) |
| { |
| m_status = initial; |
| if(is_move_to(cmd)) { |
| m_src_vertices.modify_last(vertex_dist_cmd(x, y, cmd)); |
| } else { |
| if(is_vertex(cmd)) { |
| m_src_vertices.add(vertex_dist_cmd(x, y, cmd)); |
| } else { |
| m_closed = get_close_flag(cmd); |
| } |
| } |
| } |
| static inline void calc_butt_cap(float* cap, |
| const vertex_dist& v0, |
| const vertex_dist& v1, |
| float len, |
| float width) { |
| float dx = (v1.y - v0.y) * width / len; |
| float dy = (v1.x - v0.x) * width / len; |
| cap[0] = v0.x - dx; |
| cap[1] = v0.y + dy; |
| cap[2] = v0.x + dx; |
| cap[3] = v0.y - dy; |
| } |
| void vcgen_stroke::rewind(unsigned) |
| { |
| if(m_status == initial) { |
| m_src_vertices.close(m_closed != 0); |
| if(m_src_vertices.size() < 3) { |
| m_closed = 0; |
| } |
| } |
| m_status = ready; |
| m_src_vertex = 0; |
| m_out_vertex = 0; |
| } |
| unsigned vcgen_stroke::vertex(float* x, float* y) |
| { |
| unsigned cmd = path_cmd_line_to; |
| line_join_e curj; |
| 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: |
| stroke_calc_cap(m_out_vertices, |
| m_src_vertices[0], |
| m_src_vertices[1], |
| m_src_vertices[0].dist, |
| m_line_cap, |
| m_width, |
| m_approx_scale); |
| m_src_vertex = 1; |
| m_prev_status = outline1; |
| m_status = out_vertices; |
| m_out_vertex = 0; |
| break; |
| case cap2: |
| stroke_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_line_cap, |
| m_width, |
| m_approx_scale); |
| 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; |
| } |
| } |
| curj = m_src_vertices[m_src_vertex].cmd & path_flags_jr ? miter_join_round : m_line_join; |
| 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_width, |
| curj, |
| m_inner_join, |
| m_miter_limit, |
| m_inner_miter_limit, |
| m_approx_scale); |
| ++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; |
| curj = m_src_vertices[m_src_vertex].cmd & path_flags_jr ? miter_join_round : m_line_join; |
| stroke_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_width, |
| curj, |
| m_inner_join, |
| m_miter_limit, |
| m_inner_miter_limit, |
| m_approx_scale); |
| 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_type& 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; |
| } |
| } |
