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