update dev300-m58
[ooovba.git] / agg / inc / agg_trans_lens.h
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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 //----------------------------------------------------------------------------
16 #ifndef AGG_WARP_MAGNIFIER_INCLUDED
17 #define AGG_WARP_MAGNIFIER_INCLUDED
19 #include <math.h>
20 #include "agg_basics.h"
23 namespace agg
26 class trans_warp_magnifier
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) {}
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; }
36 void transform(double* x, double* y) const
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)
44 *x = m_xc + dx * m_magn;
45 *y = m_yc + dy * m_magn;
46 return;
49 if(m_warp)
51 double m = (r + rm * (m_magn - 1.0)) / r;
52 *x = m_xc + dx * m;
53 *y = m_yc + dy * m;
54 return;
57 if(r < m_radius)
59 double m = m_radius / r;
60 *x = m_xc + dx * m;
61 *y = m_yc + dy * m;
65 private:
66 double m_xc;
67 double m_yc;
68 double m_magn;
69 double m_radius;
70 bool m_warp;
78 #endif