diff options
Diffstat (limited to 'agg/source/agg_arrowhead.cpp')
-rwxr-xr-x | agg/source/agg_arrowhead.cpp | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/agg/source/agg_arrowhead.cpp b/agg/source/agg_arrowhead.cpp new file mode 100755 index 000000000000..694ed5ad887b --- /dev/null +++ b/agg/source/agg_arrowhead.cpp @@ -0,0 +1,110 @@ +//---------------------------------------------------------------------------- +// 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 +//---------------------------------------------------------------------------- +// +// Simple arrowhead/arrowtail generator +// +//---------------------------------------------------------------------------- + +#include "agg_arrowhead.h" + +namespace agg +{ + + //------------------------------------------------------------------------ + arrowhead::arrowhead() : + m_head_d1(1.0), + m_head_d2(1.0), + m_head_d3(1.0), + m_head_d4(0.0), + m_tail_d1(1.0), + m_tail_d2(1.0), + m_tail_d3(1.0), + m_tail_d4(0.0), + m_head_flag(false), + m_tail_flag(false), + m_curr_id(0), + m_curr_coord(0) + { + } + + + + //------------------------------------------------------------------------ + void arrowhead::rewind(unsigned id) + { + m_curr_id = id; + m_curr_coord = 0; + if(id == 0) + { + if(!m_tail_flag) + { + m_cmd[0] = path_cmd_stop; + return; + } + m_coord[0] = m_tail_d1; m_coord[1] = 0.0; + m_coord[2] = m_tail_d1 - m_tail_d4; m_coord[3] = m_tail_d3; + m_coord[4] = -m_tail_d2 - m_tail_d4; m_coord[5] = m_tail_d3; + m_coord[6] = -m_tail_d2; m_coord[7] = 0.0; + m_coord[8] = -m_tail_d2 - m_tail_d4; m_coord[9] = -m_tail_d3; + m_coord[10] = m_tail_d1 - m_tail_d4; m_coord[11] = -m_tail_d3; + + m_cmd[0] = path_cmd_move_to; + m_cmd[1] = path_cmd_line_to; + m_cmd[2] = path_cmd_line_to; + m_cmd[3] = path_cmd_line_to; + m_cmd[4] = path_cmd_line_to; + m_cmd[5] = path_cmd_line_to; + m_cmd[7] = (unsigned)path_cmd_end_poly | (unsigned)path_flags_close | (unsigned)path_flags_ccw; + m_cmd[6] = path_cmd_stop; + return; + } + + if(id == 1) + { + if(!m_head_flag) + { + m_cmd[0] = path_cmd_stop; + return; + } + m_coord[0] = -m_head_d1; m_coord[1] = 0.0; + m_coord[2] = m_head_d2 + m_head_d4; m_coord[3] = -m_head_d3; + m_coord[4] = m_head_d2; m_coord[5] = 0.0; + m_coord[6] = m_head_d2 + m_head_d4; m_coord[7] = m_head_d3; + + m_cmd[0] = path_cmd_move_to; + m_cmd[1] = path_cmd_line_to; + m_cmd[2] = path_cmd_line_to; + m_cmd[3] = path_cmd_line_to; + m_cmd[4] = (unsigned)path_cmd_end_poly | (unsigned)path_flags_close | (unsigned)path_flags_ccw; + m_cmd[5] = path_cmd_stop; + return; + } + } + + + //------------------------------------------------------------------------ + unsigned arrowhead::vertex(double* x, double* y) + { + if(m_curr_id < 2) + { + unsigned curr_idx = m_curr_coord * 2; + *x = m_coord[curr_idx]; + *y = m_coord[curr_idx + 1]; + return m_cmd[m_curr_coord++]; + } + return path_cmd_stop; + } + +} |