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Diffstat (limited to 'agg/inc/agg_conv_clip_polyline.h')
-rwxr-xr-x | agg/inc/agg_conv_clip_polyline.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/agg/inc/agg_conv_clip_polyline.h b/agg/inc/agg_conv_clip_polyline.h new file mode 100755 index 000000000000..4ac66276891c --- /dev/null +++ b/agg/inc/agg_conv_clip_polyline.h @@ -0,0 +1,69 @@ +//---------------------------------------------------------------------------- +// 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 +//---------------------------------------------------------------------------- +// +// 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" +#include "agg_vertex_iterator.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(); } + + typedef conv_clip_polyline<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_polyline(const conv_clip_polyline<VertexSource>&); + const conv_clip_polyline<VertexSource>& + operator = (const conv_clip_polyline<VertexSource>&); + }; + +} + +#endif |