1//----------------------------------------------------------------------------
2// Anti-Grain Geometry - Version 2.1
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#ifndef AGG_WARP_MAGNIFIER_INCLUDED
17#define AGG_WARP_MAGNIFIER_INCLUDED
18
19#include <math.h>
20#include "agg_basics.h"
21
22
23namespace agg
24{
25
26    class trans_warp_magnifier
27    {
28    public:
29        trans_warp_magnifier() : m_xc(0.0), m_yc(0.0), m_magn(1.0), m_radius(1.0), m_warp(false) {}
30
31        void center(double x, double y) { m_xc = x; m_yc = y; }
32        void magnification(double m)    { m_magn = m;         }
33        void radius(double r)           { m_radius = r;       }
34        void warp(bool w)               { m_warp = w;         }
35
36        void transform(double* x, double* y) const
37        {
38            double dx = *x - m_xc;
39            double dy = *y - m_yc;
40            double r = sqrt(dx * dx + dy * dy);
41            double rm = m_radius / m_magn;
42            if(r < rm)
43            {
44                *x = m_xc + dx * m_magn;
45                *y = m_yc + dy * m_magn;
46                return;
47            }
48
49            if(m_warp)
50            {
51                double m = (r + rm * (m_magn - 1.0)) / r;
52                *x = m_xc + dx * m;
53                *y = m_yc + dy * m;
54                return;
55            }
56
57            if(r < m_radius)
58            {
59                double m = m_radius / r;
60                *x = m_xc + dx * m;
61                *y = m_yc + dy * m;
62            }
63        }
64
65    private:
66        double m_xc;
67        double m_yc;
68        double m_magn;
69        double m_radius;
70        bool   m_warp;
71    };
72
73
74
75}
76
77
78#endif
79
80