433 lines
12 KiB
C
433 lines
12 KiB
C
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//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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// Copyright (C) 2002-2005 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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// General Polygon Clipper based on the GPC library by Alan Murta
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// Union, Intersection, XOR, A-B, B-A
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// Contact the author if you intend to use it in commercial applications!
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// http://www.cs.man.ac.uk/aig/staff/alan/software/
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// Alan Murta (email: gpc@cs.man.ac.uk)
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_CONV_GPC_INCLUDED
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#define AGG_CONV_GPC_INCLUDED
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#include <math.h>
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#include "agg_basics.h"
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#include "agg_array.h"
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extern "C"
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{
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#include "gpc.h"
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}
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namespace agg
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{
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enum gpc_op_e
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{
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gpc_or,
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gpc_and,
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gpc_xor,
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gpc_a_minus_b,
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gpc_b_minus_a
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};
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//================================================================conv_gpc
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template<class VSA, class VSB> class conv_gpc
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{
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enum status
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{
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status_move_to,
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status_line_to,
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status_stop
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};
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struct contour_header_type
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{
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int num_vertices;
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int hole_flag;
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gpc_vertex* vertices;
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};
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typedef pod_bvector<gpc_vertex, 8> vertex_array_type;
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typedef pod_bvector<contour_header_type, 6> contour_header_array_type;
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public:
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typedef VSA source_a_type;
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typedef VSB source_b_type;
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typedef conv_gpc<source_a_type, source_b_type> self_type;
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~conv_gpc()
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{
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free_gpc_data();
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}
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conv_gpc(source_a_type& a, source_b_type& b, gpc_op_e op = gpc_or) :
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m_src_a(&a),
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m_src_b(&b),
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m_status(status_move_to),
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m_vertex(-1),
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m_contour(-1),
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m_operation(op)
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{
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memset(&m_poly_a, 0, sizeof(m_poly_a));
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memset(&m_poly_b, 0, sizeof(m_poly_b));
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memset(&m_result, 0, sizeof(m_result));
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}
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void attach1(VSA& source) { m_src_a = &source; }
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void attach2(VSB& source) { m_src_b = &source; }
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void operation(gpc_op_e v) { m_operation = v; }
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// Vertex Source Interface
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void rewind(unsigned path_id);
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unsigned vertex(double* x, double* y);
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private:
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conv_gpc(const conv_gpc<VSA, VSB>&);
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const conv_gpc<VSA, VSB>& operator = (const conv_gpc<VSA, VSB>&);
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//--------------------------------------------------------------------
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void free_polygon(gpc_polygon& p);
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void free_result();
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void free_gpc_data();
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void start_contour();
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void add_vertex(double x, double y);
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void end_contour(unsigned orientation);
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void make_polygon(gpc_polygon& p);
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void start_extracting();
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bool next_contour();
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bool next_vertex(double* x, double* y);
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//--------------------------------------------------------------------
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template<class VS> void add(VS& src, gpc_polygon& p)
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{
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unsigned cmd;
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double x, y;
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double start_x = 0.0;
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double start_y = 0.0;
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bool line_to = false;
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unsigned orientation = 0;
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m_contour_accumulator.remove_all();
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while(!is_stop(cmd = src.vertex(&x, &y)))
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{
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if(is_vertex(cmd))
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{
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if(is_move_to(cmd))
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{
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if(line_to)
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{
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end_contour(orientation);
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orientation = 0;
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}
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start_contour();
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start_x = x;
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start_y = y;
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}
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add_vertex(x, y);
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line_to = true;
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}
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else
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{
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if(is_end_poly(cmd))
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{
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orientation = get_orientation(cmd);
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if(line_to && is_closed(cmd))
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{
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add_vertex(start_x, start_y);
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}
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}
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}
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}
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if(line_to)
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{
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end_contour(orientation);
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}
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make_polygon(p);
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}
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private:
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//--------------------------------------------------------------------
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source_a_type* m_src_a;
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source_b_type* m_src_b;
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status m_status;
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int m_vertex;
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int m_contour;
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gpc_op_e m_operation;
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vertex_array_type m_vertex_accumulator;
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contour_header_array_type m_contour_accumulator;
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gpc_polygon m_poly_a;
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gpc_polygon m_poly_b;
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gpc_polygon m_result;
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};
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//------------------------------------------------------------------------
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template<class VSA, class VSB>
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void conv_gpc<VSA, VSB>::free_polygon(gpc_polygon& p)
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{
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int i;
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for(i = 0; i < p.num_contours; i++)
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{
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pod_allocator<gpc_vertex>::deallocate(p.contour[i].vertex,
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p.contour[i].num_vertices);
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}
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pod_allocator<gpc_vertex_list>::deallocate(p.contour, p.num_contours);
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memset(&p, 0, sizeof(gpc_polygon));
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}
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//------------------------------------------------------------------------
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template<class VSA, class VSB>
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void conv_gpc<VSA, VSB>::free_result()
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{
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if(m_result.contour)
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{
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gpc_free_polygon(&m_result);
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}
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memset(&m_result, 0, sizeof(m_result));
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}
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//------------------------------------------------------------------------
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template<class VSA, class VSB>
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void conv_gpc<VSA, VSB>::free_gpc_data()
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{
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free_polygon(m_poly_a);
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free_polygon(m_poly_b);
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free_result();
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}
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//------------------------------------------------------------------------
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template<class VSA, class VSB>
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void conv_gpc<VSA, VSB>::start_contour()
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{
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contour_header_type h;
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memset(&h, 0, sizeof(h));
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m_contour_accumulator.add(h);
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m_vertex_accumulator.remove_all();
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}
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//------------------------------------------------------------------------
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template<class VSA, class VSB>
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inline void conv_gpc<VSA, VSB>::add_vertex(double x, double y)
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{
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gpc_vertex v;
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v.x = x;
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v.y = y;
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m_vertex_accumulator.add(v);
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}
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//------------------------------------------------------------------------
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template<class VSA, class VSB>
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void conv_gpc<VSA, VSB>::end_contour(unsigned orientation)
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{
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if(m_contour_accumulator.size())
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{
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if(m_vertex_accumulator.size() > 2)
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{
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contour_header_type& h =
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m_contour_accumulator[m_contour_accumulator.size() - 1];
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h.num_vertices = m_vertex_accumulator.size();
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h.hole_flag = 0;
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// TO DO: Clarify the "holes"
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//if(is_cw(orientation)) h.hole_flag = 1;
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h.vertices = pod_allocator<gpc_vertex>::allocate(h.num_vertices);
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gpc_vertex* d = h.vertices;
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int i;
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for(i = 0; i < h.num_vertices; i++)
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{
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const gpc_vertex& s = m_vertex_accumulator[i];
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d->x = s.x;
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d->y = s.y;
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++d;
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}
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}
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else
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{
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m_vertex_accumulator.remove_last();
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}
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}
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}
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//------------------------------------------------------------------------
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template<class VSA, class VSB>
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void conv_gpc<VSA, VSB>::make_polygon(gpc_polygon& p)
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{
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free_polygon(p);
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if(m_contour_accumulator.size())
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{
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p.num_contours = m_contour_accumulator.size();
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p.hole = 0;
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p.contour = pod_allocator<gpc_vertex_list>::allocate(p.num_contours);
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int i;
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gpc_vertex_list* pv = p.contour;
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for(i = 0; i < p.num_contours; i++)
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{
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const contour_header_type& h = m_contour_accumulator[i];
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pv->num_vertices = h.num_vertices;
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pv->vertex = h.vertices;
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++pv;
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}
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}
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}
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//------------------------------------------------------------------------
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template<class VSA, class VSB>
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void conv_gpc<VSA, VSB>::start_extracting()
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{
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m_status = status_move_to;
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m_contour = -1;
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m_vertex = -1;
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}
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//------------------------------------------------------------------------
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template<class VSA, class VSB>
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bool conv_gpc<VSA, VSB>::next_contour()
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{
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if(++m_contour < m_result.num_contours)
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{
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m_vertex = -1;
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return true;
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}
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return false;
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}
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//------------------------------------------------------------------------
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template<class VSA, class VSB>
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inline bool conv_gpc<VSA, VSB>::next_vertex(double* x, double* y)
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{
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const gpc_vertex_list& vlist = m_result.contour[m_contour];
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if(++m_vertex < vlist.num_vertices)
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{
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const gpc_vertex& v = vlist.vertex[m_vertex];
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*x = v.x;
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*y = v.y;
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return true;
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}
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return false;
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}
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//------------------------------------------------------------------------
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template<class VSA, class VSB>
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void conv_gpc<VSA, VSB>::rewind(unsigned path_id)
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{
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free_result();
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m_src_a->rewind(path_id);
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m_src_b->rewind(path_id);
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add(*m_src_a, m_poly_a);
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add(*m_src_b, m_poly_b);
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switch(m_operation)
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{
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case gpc_or:
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gpc_polygon_clip(GPC_UNION,
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&m_poly_a,
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&m_poly_b,
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&m_result);
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break;
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case gpc_and:
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gpc_polygon_clip(GPC_INT,
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&m_poly_a,
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&m_poly_b,
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&m_result);
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break;
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case gpc_xor:
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gpc_polygon_clip(GPC_XOR,
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&m_poly_a,
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&m_poly_b,
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&m_result);
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break;
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case gpc_a_minus_b:
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gpc_polygon_clip(GPC_DIFF,
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&m_poly_a,
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&m_poly_b,
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&m_result);
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break;
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case gpc_b_minus_a:
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gpc_polygon_clip(GPC_DIFF,
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&m_poly_b,
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&m_poly_a,
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&m_result);
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break;
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}
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start_extracting();
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}
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//------------------------------------------------------------------------
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template<class VSA, class VSB>
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unsigned conv_gpc<VSA, VSB>::vertex(double* x, double* y)
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{
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if(m_status == status_move_to)
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{
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if(next_contour())
|
||
|
|
{
|
||
|
|
if(next_vertex(x, y))
|
||
|
|
{
|
||
|
|
m_status = status_line_to;
|
||
|
|
return path_cmd_move_to;
|
||
|
|
}
|
||
|
|
m_status = status_stop;
|
||
|
|
return path_cmd_end_poly | path_flags_close;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if(next_vertex(x, y))
|
||
|
|
{
|
||
|
|
return path_cmd_line_to;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
m_status = status_move_to;
|
||
|
|
}
|
||
|
|
return path_cmd_end_poly | path_flags_close;
|
||
|
|
}
|
||
|
|
return path_cmd_stop;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#endif
|