64 lines
2.5 KiB
C++
64 lines
2.5 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
|
|
//----------------------------------------------------------------------------
|
|
//
|
|
// polyline clipping converter
|
|
// There an optimized Liang-Basky algorithm is used.
|
|
// The algorithm doesn't optimize the degenerate edges, i.e. it will never
|
|
// break a closed polyline into two or more ones, instead, there will be
|
|
// degenerate edges coinciding with the respective clipping boundaries.
|
|
// This is a sub-optimal solution, because that optimization would require
|
|
// extra, rather expensive math while the rasterizer tolerates it quite well,
|
|
// without any considerable overhead.
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
#ifndef AGG_CONV_CLIP_polyline_INCLUDED
|
|
#define AGG_CONV_CLIP_polyline_INCLUDED
|
|
|
|
#include "agg_basics.h"
|
|
#include "agg_conv_adaptor_vpgen.h"
|
|
#include "agg_vpgen_clip_polyline.h"
|
|
|
|
namespace agg
|
|
{
|
|
|
|
//=======================================================conv_clip_polyline
|
|
template<class VertexSource>
|
|
struct conv_clip_polyline : public conv_adaptor_vpgen<VertexSource, vpgen_clip_polyline>
|
|
{
|
|
typedef conv_adaptor_vpgen<VertexSource, vpgen_clip_polyline> base_type;
|
|
|
|
conv_clip_polyline(VertexSource& vs) :
|
|
conv_adaptor_vpgen<VertexSource, vpgen_clip_polyline>(vs) {}
|
|
|
|
void clip_box(double x1, double y1, double x2, double y2)
|
|
{
|
|
base_type::vpgen().clip_box(x1, y1, x2, y2);
|
|
}
|
|
|
|
double x1() const { return base_type::vpgen().x1(); }
|
|
double y1() const { return base_type::vpgen().y1(); }
|
|
double x2() const { return base_type::vpgen().x2(); }
|
|
double y2() const { return base_type::vpgen().y2(); }
|
|
unsigned type() const { return base_type::type(); }
|
|
|
|
private:
|
|
conv_clip_polyline(const conv_clip_polyline<VertexSource>&);
|
|
const conv_clip_polyline<VertexSource>&
|
|
operator = (const conv_clip_polyline<VertexSource>&);
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|