70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
//----------------------------------------------------------------------------
|
|
// 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);
|
|
}
|
|
|
|
|
|
}
|