blob: e65afabba78c2bcebe75f470ef4d878bcdbb139b (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.4
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://www.antigrain.com
//----------------------------------------------------------------------------
#include <math.h>
#include "agg_trans_warp_magnifier.h"
namespace agg
{
//------------------------------------------------------------------------
void trans_warp_magnifier::transform(double* x, double* y) const
{
double dx = *x - m_xc;
double dy = *y - m_yc;
double r = sqrt(dx * dx + dy * dy);
if(r < m_radius)
{
*x = m_xc + dx * m_magn;
*y = m_yc + dy * m_magn;
return;
}
double m = (r + m_radius * (m_magn - 1.0)) / r;
*x = m_xc + dx * m;
*y = m_yc + dy * m;
}
//------------------------------------------------------------------------
void trans_warp_magnifier::inverse_transform(double* x, double* y) const
{
// New version by Andrew Skalkin
//-----------------
double dx = *x - m_xc;
double dy = *y - m_yc;
double r = sqrt(dx * dx + dy * dy);
if(r < m_radius * m_magn)
{
*x = m_xc + dx / m_magn;
*y = m_yc + dy / m_magn;
}
else
{
double rnew = r - m_radius * (m_magn - 1.0);
*x = m_xc + rnew * dx / r;
*y = m_yc + rnew * dy / r;
}
// Old version
//-----------------
//trans_warp_magnifier t(*this);
//t.magnification(1.0 / m_magn);
//t.radius(m_radius * m_magn);
//t.transform(x, y);
}
}
|
