93 lines
3 KiB
C
93 lines
3 KiB
C
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//----------------------------------------------------------------------------
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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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//
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// Horizontal span interpolator for use with an arbitrary transformer
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// The efficiency highly depends on the operations done in the transformer
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_SPAN_INTERPOLATOR_TRANS_INCLUDED
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#define AGG_SPAN_INTERPOLATOR_TRANS_INCLUDED
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#include "agg_basics.h"
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namespace agg
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{
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//=================================================span_interpolator_trans
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template<class Transformer, unsigned SubpixelShift = 8>
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class span_interpolator_trans
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{
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public:
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typedef Transformer trans_type;
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enum subpixel_scale_e
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{
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subpixel_shift = SubpixelShift,
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subpixel_scale = 1 << subpixel_shift
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};
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//--------------------------------------------------------------------
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span_interpolator_trans() {}
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span_interpolator_trans(const trans_type& trans) : m_trans(&trans) {}
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span_interpolator_trans(const trans_type& trans,
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double x, double y, unsigned) :
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m_trans(&trans)
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{
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begin(x, y, 0);
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}
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//----------------------------------------------------------------
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const trans_type& transformer() const { return *m_trans; }
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void transformer(const trans_type& trans) { m_trans = &trans; }
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//----------------------------------------------------------------
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void begin(double x, double y, unsigned)
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{
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m_x = x;
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m_y = y;
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m_trans->transform(&x, &y);
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m_ix = iround(x * subpixel_scale);
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m_iy = iround(y * subpixel_scale);
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}
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//----------------------------------------------------------------
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void operator++()
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{
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m_x += 1.0;
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double x = m_x;
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double y = m_y;
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m_trans->transform(&x, &y);
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m_ix = iround(x * subpixel_scale);
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m_iy = iround(y * subpixel_scale);
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}
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//----------------------------------------------------------------
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void coordinates(int* x, int* y) const
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{
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*x = m_ix;
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*y = m_iy;
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}
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private:
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const trans_type* m_trans;
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double m_x;
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double m_y;
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int m_ix;
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int m_iy;
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};
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}
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#endif
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