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115 lines
3.9 KiB
C++
115 lines
3.9 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry (AGG) - Version 2.5
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// A high quality rendering engine for C++
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// Copyright (C) 2002-2006 Maxim Shemanarev
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://antigrain.com
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//
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// AGG is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// AGG is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with AGG; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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// MA 02110-1301, USA.
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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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