70 lines
2.7 KiB
C
70 lines
2.7 KiB
C
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//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.2
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// Copyright (C) 2002-2004 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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//
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// Polygon clipping converter
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// There an optimized Liang-Basky algorithm is used.
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// The algorithm doesn't optimize the degenerate edges, i.e. it will never
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// break a closed polygon into two or more ones, instead, there will be
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// degenerate edges coinciding with the respective clipping boundaries.
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// This is a sub-optimal solution, because that optimization would require
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// extra, rather expensive math while the rasterizer tolerates it quite well,
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// without any considerable overhead.
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_CONV_CLIP_POLYGON_INCLUDED
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#define AGG_CONV_CLIP_POLYGON_INCLUDED
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#include "agg_basics.h"
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#include "agg_conv_adaptor_vpgen.h"
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#include "agg_vpgen_clip_polygon.h"
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#include "agg_vertex_iterator.h"
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namespace agg
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{
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//=======================================================conv_clip_polygon
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template<class VertexSource>
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struct conv_clip_polygon : public conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon>
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{
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typedef conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon> base_type;
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conv_clip_polygon(VertexSource& vs) :
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conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon>(vs) {}
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void clip_box(double x1, double y1, double x2, double y2)
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{
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base_type::vpgen().clip_box(x1, y1, x2, y2);
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}
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double x1() const { return base_type::vpgen().x1(); }
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double y1() const { return base_type::vpgen().y1(); }
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double x2() const { return base_type::vpgen().x2(); }
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double y2() const { return base_type::vpgen().y2(); }
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typedef conv_clip_polygon<VertexSource> source_type;
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typedef vertex_iterator<source_type> iterator;
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iterator begin(unsigned id) { return iterator(*this, id); }
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iterator end() { return iterator(path_cmd_stop); }
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private:
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conv_clip_polygon(const conv_clip_polygon<VertexSource>&);
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const conv_clip_polygon<VertexSource>&
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operator = (const conv_clip_polygon<VertexSource>&);
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};
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}
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#endif
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