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+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.3
+// 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
+//----------------------------------------------------------------------------
+//
+// Polygon 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 polygon 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_POLYGON_INCLUDED
+#define AGG_CONV_CLIP_POLYGON_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_conv_adaptor_vpgen.h"
+#include "agg_vpgen_clip_polygon.h"
+#include "agg_vertex_iterator.h"
+
+namespace agg
+{
+
+ //=======================================================conv_clip_polygon
+ template<class VertexSource>
+ struct conv_clip_polygon : public conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon>
+ {
+ typedef conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon> base_type;
+
+ conv_clip_polygon(VertexSource& vs) :
+ conv_adaptor_vpgen<VertexSource, vpgen_clip_polygon>(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(); }
+
+ typedef conv_clip_polygon<VertexSource> source_type;
+ typedef vertex_iterator<source_type> iterator;
+ iterator begin(unsigned id) { return iterator(*this, id); }
+ iterator end() { return iterator(path_cmd_stop); }
+
+ private:
+ conv_clip_polygon(const conv_clip_polygon<VertexSource>&);
+ const conv_clip_polygon<VertexSource>&
+ operator = (const conv_clip_polygon<VertexSource>&);
+ };
+
+}
+
+#endif