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