92 lines
3 KiB
C++
92 lines
3 KiB
C++
//----------------------------------------------------------------------------
|
|
// Anti-Grain Geometry - Version 2.4
|
|
// 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
|
|
//----------------------------------------------------------------------------
|
|
//
|
|
// Horizontal span interpolator for use with an arbitrary transformer
|
|
// The efficiency highly depends on the operations done in the transformer
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
#ifndef AGG_SPAN_INTERPOLATOR_TRANS_INCLUDED
|
|
#define AGG_SPAN_INTERPOLATOR_TRANS_INCLUDED
|
|
|
|
#include "agg_basics.h"
|
|
|
|
namespace agg
|
|
{
|
|
//=================================================span_interpolator_trans
|
|
template<class Transformer, unsigned SubpixelShift = 8>
|
|
class span_interpolator_trans
|
|
{
|
|
public:
|
|
typedef Transformer trans_type;
|
|
enum subpixel_scale_e
|
|
{
|
|
subpixel_shift = SubpixelShift,
|
|
subpixel_scale = 1 << subpixel_shift
|
|
};
|
|
|
|
//--------------------------------------------------------------------
|
|
span_interpolator_trans() {}
|
|
span_interpolator_trans(const trans_type& trans) : m_trans(&trans) {}
|
|
span_interpolator_trans(const trans_type& trans,
|
|
double x, double y, unsigned) :
|
|
m_trans(&trans)
|
|
{
|
|
begin(x, y, 0);
|
|
}
|
|
|
|
//----------------------------------------------------------------
|
|
const trans_type& transformer() const { return *m_trans; }
|
|
void transformer(const trans_type& trans) { m_trans = &trans; }
|
|
|
|
//----------------------------------------------------------------
|
|
void begin(double x, double y, unsigned)
|
|
{
|
|
m_x = x;
|
|
m_y = y;
|
|
m_trans->transform(&x, &y);
|
|
m_ix = iround(x * subpixel_scale);
|
|
m_iy = iround(y * subpixel_scale);
|
|
}
|
|
|
|
//----------------------------------------------------------------
|
|
void operator++()
|
|
{
|
|
m_x += 1.0;
|
|
double x = m_x;
|
|
double y = m_y;
|
|
m_trans->transform(&x, &y);
|
|
m_ix = iround(x * subpixel_scale);
|
|
m_iy = iround(y * subpixel_scale);
|
|
}
|
|
|
|
//----------------------------------------------------------------
|
|
void coordinates(int* x, int* y) const
|
|
{
|
|
*x = m_ix;
|
|
*y = m_iy;
|
|
}
|
|
|
|
private:
|
|
const trans_type* m_trans;
|
|
double m_x;
|
|
double m_y;
|
|
int m_ix;
|
|
int m_iy;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|