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72 lines
2.9 KiB
C++
72 lines
2.9 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry (AGG) - Version 2.5
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// A high quality rendering engine for C++
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// Copyright (C) 2002-2006 Maxim Shemanarev
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://antigrain.com
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//
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// AGG is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// AGG is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with AGG; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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// MA 02110-1301, USA.
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//----------------------------------------------------------------------------
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//
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// polyline 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 polyline 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_polyline_INCLUDED
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#define AGG_CONV_CLIP_polyline_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_polyline.h"
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namespace agg
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{
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//=======================================================conv_clip_polyline
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template<class VertexSource>
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struct conv_clip_polyline : public conv_adaptor_vpgen<VertexSource, vpgen_clip_polyline>
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{
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typedef conv_adaptor_vpgen<VertexSource, vpgen_clip_polyline> base_type;
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conv_clip_polyline(VertexSource& vs) :
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conv_adaptor_vpgen<VertexSource, vpgen_clip_polyline>(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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private:
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conv_clip_polyline(const conv_clip_polyline<VertexSource>&);
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const conv_clip_polyline<VertexSource>&
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operator = (const conv_clip_polyline<VertexSource>&);
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};
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}
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#endif
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