1//----------------------------------------------------------------------------
2// Anti-Grain Geometry - Version 2.4
3// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
4//
5// Permission to copy, use, modify, sell and distribute this software
6// is granted provided this copyright notice appears in all copies.
7// This software is provided "as is" without express or implied
8// warranty, and with no claim as to its suitability for any purpose.
9//
10//----------------------------------------------------------------------------
11// Contact: mcseem@antigrain.com
12//          mcseemagg@yahoo.com
13//          http://www.antigrain.com
14//----------------------------------------------------------------------------
15//
16// Polygon clipping converter
17// There an optimized Liang-Basky algorithm is used.
18// The algorithm doesn't optimize the degenerate edges, i.e. it will never
19// break a closed polygon into two or more ones, instead, there will be
20// degenerate edges coinciding with the respective clipping boundaries.
21// This is a sub-optimal solution, because that optimization would require
22// extra, rather expensive math while the rasterizer tolerates it quite well,
23// without any considerable overhead.
24//
25//----------------------------------------------------------------------------
26#ifndef AGG_CONV_CLIP_POLYGON_INCLUDED
27#define AGG_CONV_CLIP_POLYGON_INCLUDED
28
29#include "agg_basics.h"
30#include "agg_conv_adaptor_vpgen.h"
31#include "agg_vpgen_clip_polygon.h"
32
33namespace agg
34{
35
36    //=======================================================conv_clip_polygon
37    template<class VertexSource>
38    struct conv_clip_polygon : public conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon>
39    {
40        typedef conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon> base_type;
41
42        conv_clip_polygon(VertexSource& vs) :
43            conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon>(vs) {}
44
45        void clip_box(double x1, double y1, double x2, double y2)
46        {
47            base_type::vpgen().clip_box(x1, y1, x2, y2);
48        }
49
50        double x1() const { return base_type::vpgen().x1(); }
51        double y1() const { return base_type::vpgen().y1(); }
52        double x2() const { return base_type::vpgen().x2(); }
53        double y2() const { return base_type::vpgen().y2(); }
54
55    private:
56        conv_clip_polygon(const conv_clip_polygon<VertexSource>&);
57        const conv_clip_polygon<VertexSource>&
58            operator = (const conv_clip_polygon<VertexSource>&);
59    };
60
61}
62
63#endif
64