79 lines
2.1 KiB
C++
79 lines
2.1 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.1
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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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#ifndef AGG_WARP_MAGNIFIER_INCLUDED
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#define AGG_WARP_MAGNIFIER_INCLUDED
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#include <cmath>
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#include "agg_basics.h"
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namespace agg
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{
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class trans_warp_magnifier
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{
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public:
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trans_warp_magnifier() : m_xc(0.0), m_yc(0.0), m_magn(1.0), m_radius(1.0), m_warp(false) {}
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void center(double x, double y) { m_xc = x; m_yc = y; }
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void magnification(double m) { m_magn = m; }
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void radius(double r) { m_radius = r; }
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void warp(bool w) { m_warp = w; }
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void 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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double rm = m_radius / m_magn;
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if(r < rm)
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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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if(m_warp)
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{
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double m = (r + rm * (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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return;
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}
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if(r < m_radius)
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{
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double m = m_radius / 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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private:
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double m_xc;
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double m_yc;
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double m_magn;
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double m_radius;
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bool m_warp;
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};
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}
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#endif
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