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| #include "agg_vcgen_bspline.h" |
|
|
| namespace agg |
| { |
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| |
| vcgen_bspline::vcgen_bspline() : |
| m_src_vertices(), |
| m_spline_x(), |
| m_spline_y(), |
| m_interpolation_step(1.0/50.0), |
| m_closed(0), |
| m_status(initial), |
| m_src_vertex(0) |
| { |
| } |
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| |
| void vcgen_bspline::remove_all() |
| { |
| m_src_vertices.remove_all(); |
| m_closed = 0; |
| m_status = initial; |
| m_src_vertex = 0; |
| } |
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| |
| void vcgen_bspline::add_vertex(double x, double y, unsigned cmd) |
| { |
| m_status = initial; |
| if(is_move_to(cmd)) |
| { |
| m_src_vertices.modify_last(point_d(x, y)); |
| } |
| else |
| { |
| if(is_vertex(cmd)) |
| { |
| m_src_vertices.add(point_d(x, y)); |
| } |
| else |
| { |
| m_closed = get_close_flag(cmd); |
| } |
| } |
| } |
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| |
| void vcgen_bspline::rewind(unsigned) |
| { |
| m_cur_abscissa = 0.0; |
| m_max_abscissa = 0.0; |
| m_src_vertex = 0; |
| if(m_status == initial && m_src_vertices.size() > 2) |
| { |
| if(m_closed) |
| { |
| m_spline_x.init(m_src_vertices.size() + 8); |
| m_spline_y.init(m_src_vertices.size() + 8); |
| m_spline_x.add_point(0.0, m_src_vertices.prev(m_src_vertices.size() - 3).x); |
| m_spline_y.add_point(0.0, m_src_vertices.prev(m_src_vertices.size() - 3).y); |
| m_spline_x.add_point(1.0, m_src_vertices[m_src_vertices.size() - 3].x); |
| m_spline_y.add_point(1.0, m_src_vertices[m_src_vertices.size() - 3].y); |
| m_spline_x.add_point(2.0, m_src_vertices[m_src_vertices.size() - 2].x); |
| m_spline_y.add_point(2.0, m_src_vertices[m_src_vertices.size() - 2].y); |
| m_spline_x.add_point(3.0, m_src_vertices[m_src_vertices.size() - 1].x); |
| m_spline_y.add_point(3.0, m_src_vertices[m_src_vertices.size() - 1].y); |
| } |
| else |
| { |
| m_spline_x.init(m_src_vertices.size()); |
| m_spline_y.init(m_src_vertices.size()); |
| } |
| unsigned i; |
| for(i = 0; i < m_src_vertices.size(); i++) |
| { |
| double x = m_closed ? i + 4 : i; |
| m_spline_x.add_point(x, m_src_vertices[i].x); |
| m_spline_y.add_point(x, m_src_vertices[i].y); |
| } |
| m_cur_abscissa = 0.0; |
| m_max_abscissa = m_src_vertices.size() - 1; |
| if(m_closed) |
| { |
| m_cur_abscissa = 4.0; |
| m_max_abscissa += 5.0; |
| m_spline_x.add_point(m_src_vertices.size() + 4, m_src_vertices[0].x); |
| m_spline_y.add_point(m_src_vertices.size() + 4, m_src_vertices[0].y); |
| m_spline_x.add_point(m_src_vertices.size() + 5, m_src_vertices[1].x); |
| m_spline_y.add_point(m_src_vertices.size() + 5, m_src_vertices[1].y); |
| m_spline_x.add_point(m_src_vertices.size() + 6, m_src_vertices[2].x); |
| m_spline_y.add_point(m_src_vertices.size() + 6, m_src_vertices[2].y); |
| m_spline_x.add_point(m_src_vertices.size() + 7, m_src_vertices.next(2).x); |
| m_spline_y.add_point(m_src_vertices.size() + 7, m_src_vertices.next(2).y); |
| } |
| m_spline_x.prepare(); |
| m_spline_y.prepare(); |
| } |
| m_status = ready; |
| } |
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| |
| unsigned vcgen_bspline::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_cur_abscissa >= m_max_abscissa) |
| { |
| if(m_closed) |
| { |
| m_status = end_poly; |
| break; |
| } |
| else |
| { |
| *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_line_to; |
| } |
| } |
|
|
| *x = m_spline_x.get_stateful(m_cur_abscissa); |
| *y = m_spline_y.get_stateful(m_cur_abscissa); |
| m_src_vertex++; |
| m_cur_abscissa += m_interpolation_step; |
| return (m_src_vertex == 1) ? path_cmd_move_to : path_cmd_line_to; |
|
|
| case end_poly: |
| m_status = stop; |
| return path_cmd_end_poly | m_closed; |
|
|
| case stop: |
| return path_cmd_stop; |
| } |
| } |
| return cmd; |
| } |
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|
| } |
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