51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
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//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.3
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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 <math.h>
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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 = 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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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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