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