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| #include <math.h> |
| #include "agg_vcgen_dash.h" |
| #include "agg_shorten_path.h" |
|
|
| namespace agg |
| { |
|
|
| |
| vcgen_dash::vcgen_dash() : |
| m_total_dash_len(0.0), |
| m_num_dashes(0), |
| m_dash_start(0.0), |
| m_shorten(0.0), |
| m_curr_dash_start(0.0), |
| m_curr_dash(0), |
| m_src_vertices(), |
| m_closed(0), |
| m_status(initial), |
| m_src_vertex(0) |
| { |
| } |
|
|
|
|
|
|
| |
| void vcgen_dash::remove_all_dashes() |
| { |
| m_total_dash_len = 0.0; |
| m_num_dashes = 0; |
| m_curr_dash_start = 0.0; |
| m_curr_dash = 0; |
| } |
|
|
|
|
| |
| void vcgen_dash::add_dash(double dash_len, double gap_len) |
| { |
| if(m_num_dashes < max_dashes) |
| { |
| m_total_dash_len += dash_len + gap_len; |
| m_dashes[m_num_dashes++] = dash_len; |
| m_dashes[m_num_dashes++] = gap_len; |
| } |
| } |
|
|
|
|
| |
| void vcgen_dash::dash_start(double ds) |
| { |
| m_dash_start = ds; |
| calc_dash_start(fabs(ds)); |
| } |
|
|
|
|
| |
| void vcgen_dash::calc_dash_start(double ds) |
| { |
| m_curr_dash = 0; |
| m_curr_dash_start = 0.0; |
| while(ds > 0.0) |
| { |
| if(ds > m_dashes[m_curr_dash]) |
| { |
| ds -= m_dashes[m_curr_dash]; |
| ++m_curr_dash; |
| m_curr_dash_start = 0.0; |
| if(m_curr_dash >= m_num_dashes) m_curr_dash = 0; |
| } |
| else |
| { |
| m_curr_dash_start = ds; |
| ds = 0.0; |
| } |
| } |
| } |
|
|
|
|
| |
| void vcgen_dash::remove_all() |
| { |
| m_status = initial; |
| m_src_vertices.remove_all(); |
| m_closed = 0; |
| } |
|
|
|
|
| |
| void vcgen_dash::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_dash::rewind(unsigned) |
| { |
| if(m_status == initial) |
| { |
| m_src_vertices.close(m_closed != 0); |
| shorten_path(m_src_vertices, m_shorten, m_closed); |
| } |
| m_status = ready; |
| m_src_vertex = 0; |
| } |
|
|
|
|
| |
| unsigned vcgen_dash::vertex(double* x, double* y) |
| { |
| unsigned cmd = path_cmd_move_to; |
| while(!is_stop(cmd)) |
| { |
| switch(m_status) |
| { |
| case initial: |
| rewind(0); |
|
|
| case ready: |
| if(m_num_dashes < 2 || m_src_vertices.size() < 2) |
| { |
| cmd = path_cmd_stop; |
| break; |
| } |
| m_status = polyline; |
| m_src_vertex = 1; |
| m_v1 = &m_src_vertices[0]; |
| m_v2 = &m_src_vertices[1]; |
| m_curr_rest = m_v1->dist; |
| *x = m_v1->x; |
| *y = m_v1->y; |
| if(m_dash_start >= 0.0) calc_dash_start(m_dash_start); |
| return path_cmd_move_to; |
|
|
| case polyline: |
| { |
| double dash_rest = m_dashes[m_curr_dash] - m_curr_dash_start; |
|
|
| unsigned cmd = (m_curr_dash & 1) ? |
| path_cmd_move_to : |
| path_cmd_line_to; |
|
|
| if(m_curr_rest > dash_rest) |
| { |
| m_curr_rest -= dash_rest; |
| ++m_curr_dash; |
| if(m_curr_dash >= m_num_dashes) m_curr_dash = 0; |
| m_curr_dash_start = 0.0; |
| *x = m_v2->x - (m_v2->x - m_v1->x) * m_curr_rest / m_v1->dist; |
| *y = m_v2->y - (m_v2->y - m_v1->y) * m_curr_rest / m_v1->dist; |
| } |
| else |
| { |
| m_curr_dash_start += m_curr_rest; |
| *x = m_v2->x; |
| *y = m_v2->y; |
| ++m_src_vertex; |
| m_v1 = m_v2; |
| m_curr_rest = m_v1->dist; |
| if(m_closed) |
| { |
| if(m_src_vertex > m_src_vertices.size()) |
| { |
| m_status = stop; |
| } |
| else |
| { |
| m_v2 = &m_src_vertices |
| [ |
| (m_src_vertex >= m_src_vertices.size()) ? 0 : |
| m_src_vertex |
| ]; |
| } |
| } |
| else |
| { |
| if(m_src_vertex >= m_src_vertices.size()) |
| { |
| m_status = stop; |
| } |
| else |
| { |
| m_v2 = &m_src_vertices[m_src_vertex]; |
| } |
| } |
| } |
| return cmd; |
| } |
| break; |
|
|
| case stop: |
| cmd = path_cmd_stop; |
| break; |
| } |
|
|
| } |
| return path_cmd_stop; |
| } |
|
|
|
|
| } |
|
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|
