71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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#include <cmath>
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#include "agg_trans_warp_magnifier.h"
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namespace agg
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{
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//------------------------------------------------------------------------
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void trans_warp_magnifier::transform(double* x, double* y) const
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{
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double dx = *x - m_xc;
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double dy = *y - m_yc;
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double r = std::sqrt(dx * dx + dy * dy);
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if(r < m_radius)
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{
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*x = m_xc + dx * m_magn;
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*y = m_yc + dy * m_magn;
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return;
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}
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double m = (r + m_radius * (m_magn - 1.0)) / r;
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*x = m_xc + dx * m;
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*y = m_yc + dy * m;
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}
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//------------------------------------------------------------------------
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void trans_warp_magnifier::inverse_transform(double* x, double* y) const
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{
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// New version by Andrew Skalkin
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//-----------------
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double dx = *x - m_xc;
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double dy = *y - m_yc;
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double r = std::sqrt(dx * dx + dy * dy);
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if(r < m_radius * m_magn)
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{
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*x = m_xc + dx / m_magn;
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*y = m_yc + dy / m_magn;
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}
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else
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{
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double rnew = r - m_radius * (m_magn - 1.0);
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*x = m_xc + rnew * dx / r;
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*y = m_yc + rnew * dy / r;
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}
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// Old version
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//-----------------
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//trans_warp_magnifier t(*this);
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//t.magnification(1.0 / m_magn);
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//t.radius(m_radius * m_magn);
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//t.transform(x, y);
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}
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}
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