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241 lines
8 KiB
C++
241 lines
8 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry (AGG) - Version 2.5
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// A high quality rendering engine for C++
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// Copyright (C) 2002-2006 Maxim Shemanarev
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://antigrain.com
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//
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// AGG is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// AGG is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with AGG; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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// MA 02110-1301, USA.
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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 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_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 = iround(tx * subpixel_scale);
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int y1 = iround(ty * subpixel_scale);
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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 = iround(tx * subpixel_scale);
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int y2 = iround(ty * subpixel_scale);
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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 resynchronize(double xe, double ye, unsigned len)
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{
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m_trans->transform(&xe, &ye);
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m_li_x = dda2_line_interpolator(m_li_x.y(), iround(xe * subpixel_scale), len);
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m_li_y = dda2_line_interpolator(m_li_y.y(), iround(ye * subpixel_scale), 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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//=====================================span_interpolator_linear_subdiv
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template<class Transformer = trans_affine, unsigned SubpixelShift = 8>
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class span_interpolator_linear_subdiv
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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_linear_subdiv() :
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m_subdiv_shift(4),
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m_subdiv_size(1 << m_subdiv_shift),
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m_subdiv_mask(m_subdiv_size - 1) {}
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span_interpolator_linear_subdiv(const trans_type& trans,
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unsigned subdiv_shift = 4) :
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m_subdiv_shift(subdiv_shift),
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m_subdiv_size(1 << m_subdiv_shift),
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m_subdiv_mask(m_subdiv_size - 1),
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m_trans(&trans) {}
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span_interpolator_linear_subdiv(const trans_type& trans,
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double x, double y, unsigned len,
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unsigned subdiv_shift = 4) :
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m_subdiv_shift(subdiv_shift),
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m_subdiv_size(1 << m_subdiv_shift),
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m_subdiv_mask(m_subdiv_size - 1),
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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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unsigned subdiv_shift() const { return m_subdiv_shift; }
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void subdiv_shift(unsigned shift)
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{
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m_subdiv_shift = shift;
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m_subdiv_size = 1 << m_subdiv_shift;
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m_subdiv_mask = m_subdiv_size - 1;
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}
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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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m_pos = 1;
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m_src_x = iround(x * subpixel_scale) + subpixel_scale;
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m_src_y = y;
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m_len = len;
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if(len > m_subdiv_size) len = m_subdiv_size;
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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 = iround(tx * subpixel_scale);
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int y1 = iround(ty * subpixel_scale);
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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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m_li_x = dda2_line_interpolator(x1, iround(tx * subpixel_scale), len);
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m_li_y = dda2_line_interpolator(y1, iround(ty * subpixel_scale), 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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if(m_pos >= m_subdiv_size)
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{
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unsigned len = m_len;
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if(len > m_subdiv_size) len = m_subdiv_size;
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double tx = double(m_src_x) / double(subpixel_scale) + len;
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double ty = m_src_y;
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m_trans->transform(&tx, &ty);
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m_li_x = dda2_line_interpolator(m_li_x.y(), iround(tx * subpixel_scale), len);
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m_li_y = dda2_line_interpolator(m_li_y.y(), iround(ty * subpixel_scale), len);
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m_pos = 0;
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}
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m_src_x += subpixel_scale;
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++m_pos;
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--m_len;
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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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unsigned m_subdiv_shift;
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unsigned m_subdiv_size;
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unsigned m_subdiv_mask;
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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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int m_src_x;
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double m_src_y;
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unsigned m_pos;
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unsigned m_len;
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};
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}
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#endif
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