1//----------------------------------------------------------------------------
2// Anti-Grain Geometry - Version 2.4
3// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
4//
5// Permission to copy, use, modify, sell and distribute this software
6// is granted provided this copyright notice appears in all copies.
7// This software is provided "as is" without express or implied
8// warranty, and with no claim as to its suitability for any purpose.
9//
10//----------------------------------------------------------------------------
11// Contact: mcseem@antigrain.com
12//          mcseemagg@yahoo.com
13//          http://www.antigrain.com
14//----------------------------------------------------------------------------
15
16#include <math.h>
17#include "agg_vpgen_segmentator.h"
18
19namespace agg
20{
21
22    void vpgen_segmentator::move_to(double x, double y)
23    {
24        m_x1 = x;
25        m_y1 = y;
26        m_dx = 0.0;
27        m_dy = 0.0;
28        m_dl = 2.0;
29        m_ddl = 2.0;
30        m_cmd = path_cmd_move_to;
31    }
32
33    void vpgen_segmentator::line_to(double x, double y)
34    {
35        m_x1 += m_dx;
36        m_y1 += m_dy;
37        m_dx  = x - m_x1;
38        m_dy  = y - m_y1;
39        double len = sqrt(m_dx * m_dx + m_dy * m_dy) * m_approximation_scale;
40        if(len < 1e-30) len = 1e-30;
41        m_ddl = 1.0 / len;
42        m_dl  = (m_cmd == path_cmd_move_to) ? 0.0 : m_ddl;
43        if(m_cmd == path_cmd_stop) m_cmd = path_cmd_line_to;
44    }
45
46    unsigned vpgen_segmentator::vertex(double* x, double* y)
47    {
48        if(m_cmd == path_cmd_stop) return path_cmd_stop;
49
50        unsigned cmd = m_cmd;
51        m_cmd = path_cmd_line_to;
52        if(m_dl >= 1.0 - m_ddl)
53        {
54            m_dl = 1.0;
55            m_cmd = path_cmd_stop;
56            *x = m_x1 + m_dx;
57            *y = m_y1 + m_dy;
58            return cmd;
59        }
60        *x = m_x1 + m_dx * m_dl;
61        *y = m_y1 + m_dy * m_dl;
62        m_dl += m_ddl;
63        return cmd;
64    }
65
66}
67
68