102 lines
3.0 KiB
C++
102 lines
3.0 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.2
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// Copyright (C) 2002-2004 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_SPAN_INTERPOLATOR_LINEAR_INCLUDED
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#define AGG_SPAN_INTERPOLATOR_LINEAR_INCLUDED
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#include "agg_basics.h"
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#include "agg_dda_line.h"
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#include "agg_trans_affine.h"
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namespace agg
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{
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//================================================span_interpolator_linear
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template<class Transformer = trans_affine, unsigned SubpixelShift = 8>
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class span_interpolator_linear
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{
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public:
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typedef Transformer trans_type;
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enum
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{
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subpixel_shift = SubpixelShift,
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subpixel_size = 1 << subpixel_shift
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};
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//--------------------------------------------------------------------
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span_interpolator_linear() {}
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span_interpolator_linear(const trans_type& trans) : m_trans(&trans) {}
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span_interpolator_linear(const trans_type& trans,
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double x, double y, unsigned len) :
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m_trans(&trans)
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{
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begin(x, y, len);
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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 len)
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{
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double tx;
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double ty;
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tx = x;
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ty = y;
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m_trans->transform(&tx, &ty);
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int x1 = int(tx * subpixel_size);
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int y1 = int(ty * subpixel_size);
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tx = x + len;
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ty = y;
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m_trans->transform(&tx, &ty);
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int x2 = int(tx * subpixel_size);
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int y2 = int(ty * subpixel_size);
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m_li_x = dda2_line_interpolator(x1, x2, len);
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m_li_y = dda2_line_interpolator(y1, y2, len);
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}
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//----------------------------------------------------------------
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void operator++()
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{
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++m_li_x;
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++m_li_y;
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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_li_x.y();
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*y = m_li_y.y();
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}
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private:
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const trans_type* m_trans;
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dda2_line_interpolator m_li_x;
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dda2_line_interpolator m_li_y;
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};
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}
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#endif
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