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Diffstat (limited to 'agg/source/agg_trans_warp_magnifier.cpp')
-rwxr-xr-x | agg/source/agg_trans_warp_magnifier.cpp | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/agg/source/agg_trans_warp_magnifier.cpp b/agg/source/agg_trans_warp_magnifier.cpp new file mode 100755 index 000000000000..4f9d28233907 --- /dev/null +++ b/agg/source/agg_trans_warp_magnifier.cpp @@ -0,0 +1,50 @@ +//---------------------------------------------------------------------------- +// Anti-Grain Geometry - Version 2.3 +// 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 + { + trans_warp_magnifier t(*this); + t.magnification(1.0 / m_magn); + t.radius(m_radius * m_magn); + t.transform(x, y); + } + + +} |