110 lines
3.3 KiB
C++
110 lines
3.3 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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//
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// Simple arrowhead/arrowtail generator
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//
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//----------------------------------------------------------------------------
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#include "agg_arrowhead.h"
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namespace agg
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{
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//------------------------------------------------------------------------
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arrowhead::arrowhead() :
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m_head_d1(1.0),
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m_head_d2(1.0),
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m_head_d3(1.0),
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m_head_d4(0.0),
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m_tail_d1(1.0),
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m_tail_d2(1.0),
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m_tail_d3(1.0),
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m_tail_d4(0.0),
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m_head_flag(false),
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m_tail_flag(false),
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m_curr_id(0),
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m_curr_coord(0)
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{
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}
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//------------------------------------------------------------------------
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void arrowhead::rewind(unsigned path_id)
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{
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m_curr_id = path_id;
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m_curr_coord = 0;
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if(path_id == 0)
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{
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if(!m_tail_flag)
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{
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m_cmd[0] = path_cmd_stop;
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return;
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}
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m_coord[0] = m_tail_d1; m_coord[1] = 0.0;
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m_coord[2] = m_tail_d1 - m_tail_d4; m_coord[3] = m_tail_d3;
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m_coord[4] = -m_tail_d2 - m_tail_d4; m_coord[5] = m_tail_d3;
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m_coord[6] = -m_tail_d2; m_coord[7] = 0.0;
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m_coord[8] = -m_tail_d2 - m_tail_d4; m_coord[9] = -m_tail_d3;
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m_coord[10] = m_tail_d1 - m_tail_d4; m_coord[11] = -m_tail_d3;
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m_cmd[0] = path_cmd_move_to;
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m_cmd[1] = path_cmd_line_to;
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m_cmd[2] = path_cmd_line_to;
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m_cmd[3] = path_cmd_line_to;
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m_cmd[4] = path_cmd_line_to;
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m_cmd[5] = path_cmd_line_to;
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m_cmd[7] = path_cmd_end_poly | path_flags_close | path_flags_ccw;
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m_cmd[6] = path_cmd_stop;
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return;
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}
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if(path_id == 1)
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{
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if(!m_head_flag)
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{
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m_cmd[0] = path_cmd_stop;
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return;
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}
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m_coord[0] = -m_head_d1; m_coord[1] = 0.0;
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m_coord[2] = m_head_d2 + m_head_d4; m_coord[3] = -m_head_d3;
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m_coord[4] = m_head_d2; m_coord[5] = 0.0;
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m_coord[6] = m_head_d2 + m_head_d4; m_coord[7] = m_head_d3;
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m_cmd[0] = path_cmd_move_to;
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m_cmd[1] = path_cmd_line_to;
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m_cmd[2] = path_cmd_line_to;
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m_cmd[3] = path_cmd_line_to;
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m_cmd[4] = path_cmd_end_poly | path_flags_close | path_flags_ccw;
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m_cmd[5] = path_cmd_stop;
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return;
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}
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}
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//------------------------------------------------------------------------
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unsigned arrowhead::vertex(double* x, double* y)
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{
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if(m_curr_id < 2)
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{
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unsigned curr_idx = m_curr_coord * 2;
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*x = m_coord[curr_idx];
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*y = m_coord[curr_idx + 1];
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return m_cmd[m_curr_coord++];
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}
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return path_cmd_stop;
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}
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}
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