376 lines
14 KiB
C
376 lines
14 KiB
C
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/*******************************************************************************
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* *
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* Author : Angus Johnson *
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* Version : 1.1 *
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* Date : 4 April 2011 *
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* Website : http://www.angusj.com *
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* Copyright : Angus Johnson 2010-2011 *
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* *
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* License: *
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* Use, modification & distribution is subject to Boost Software License Ver 1. *
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* http://www.boost.org/LICENSE_1_0.txt *
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* *
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*******************************************************************************/
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#ifndef AGG_CONV_CLIPPER_INCLUDED
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#define AGG_CONV_CLIPPER_INCLUDED
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#include <cmath>
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#include "agg_basics.h"
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#include "agg_array.h"
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#include "clipper.hpp"
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namespace agg
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{
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enum clipper_op_e { clipper_or,
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clipper_and, clipper_xor, clipper_a_minus_b, clipper_b_minus_a };
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enum clipper_PolyFillType {clipper_even_odd, clipper_non_zero, clipper_positive, clipper_negative};
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template<class VSA, class VSB> class conv_clipper
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{
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enum status { status_move_to, status_line_to, status_next };
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typedef VSA source_a_type;
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typedef VSB source_b_type;
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typedef conv_clipper<source_a_type, source_b_type> self_type;
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private:
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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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int m_expoly;
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int m_scaling_factor;
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clipper_op_e m_operation;
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pod_bvector<ClipperLib::IntPoint, 8> m_vertex_accumulator;
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ClipperLib::Polygons m_poly_a;
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ClipperLib::Polygons m_poly_b;
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ClipperLib::ExPolygons m_result;
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ClipperLib::Clipper m_clipper;
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clipper_PolyFillType m_subjFillType;
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clipper_PolyFillType m_clipFillType;
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int Round(double val)
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{
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if ((val < 0)) return (int)(val - 0.5); else return (int)(val + 0.5);
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}
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public:
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conv_clipper(source_a_type &a, source_b_type &b,
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clipper_op_e op = clipper_or,
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clipper_PolyFillType subjFillType = clipper_even_odd,
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clipper_PolyFillType clipFillType = clipper_even_odd,
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int scaling_factor = 2) :
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m_src_a(&a),
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m_src_b(&b),
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m_status(status_next),
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m_vertex(-1),
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m_contour(-1),
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m_expoly(-1),
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m_operation(op),
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m_subjFillType(subjFillType),
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m_clipFillType(clipFillType)
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{
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m_scaling_factor = std::max(std::min(scaling_factor, 6),0);
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m_scaling_factor = Round(std::pow((double)10, m_scaling_factor));
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}
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conv_clipper(source_a_type &a,
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clipper_op_e op = clipper_and,
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clipper_PolyFillType subjFillType = clipper_non_zero,
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clipper_PolyFillType clipFillType = clipper_non_zero,
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int scaling_factor = 6) :
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m_src_a(&a),
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m_status(status_next),
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m_vertex(-1),
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m_contour(-1),
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m_expoly(-1),
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m_operation(op),
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m_subjFillType(subjFillType),
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m_clipFillType(clipFillType)
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{
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m_scaling_factor = std::max(std::min(scaling_factor, 6),0);
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m_scaling_factor = Round(std::pow((double)10, m_scaling_factor));
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}
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unsigned type() const { return m_src_a->type(); }
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~conv_clipper()
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{
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}
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void attach1(VSA &source, clipper_PolyFillType subjFillType = clipper_even_odd)
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{ m_src_a = &source; m_subjFillType = subjFillType; }
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void attach2(VSB &source, clipper_PolyFillType clipFillType = clipper_even_odd)
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{ m_src_b = &source; m_clipFillType = clipFillType; }
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void operation(clipper_op_e v) { m_operation = v; }
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void rewind(unsigned path_id);
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unsigned vertex(double* x, double* y);
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bool next_poly();
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bool next_contour();
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bool next_vertex(double* x, double* y);
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void start_extracting();
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void add_vertex_(double &x, double &y);
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void end_contour(ClipperLib::Polygons &p);
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void reverse(bool reverse);
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template<class VS> void add(VS &src, ClipperLib::Polygons &p){
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unsigned cmd;
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double x; double y; double start_x; double start_y;
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bool starting_first_line;
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start_x = 0.0;
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start_y = 0.0;
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starting_first_line = true;
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p.resize(0);
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cmd = src->vertex( &x , &y );
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while(!is_stop(cmd))
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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(!starting_first_line ) end_contour(p);
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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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starting_first_line = false;
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}
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else if(is_end_poly(cmd))
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{
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if(!starting_first_line && is_closed(cmd))
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add_vertex_( start_x, start_y );
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}
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cmd = src->vertex( &x, &y );
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}
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end_contour(p);
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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_clipper<VSA, VSB>::reverse(bool reverse)
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{
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m_clipper.ReverseSolution(true);
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};
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template<class VSA, class VSB>
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void conv_clipper<VSA, VSB>::start_extracting()
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{
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m_status = status_next;
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m_expoly = -1;
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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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void conv_clipper<VSA, VSB>::rewind(unsigned path_id)
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{
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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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m_result.resize(0);
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ClipperLib::PolyFillType pftSubj, pftClip;
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switch (m_subjFillType)
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{
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case clipper_even_odd: pftSubj = ClipperLib::pftEvenOdd; break;
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case clipper_non_zero: pftSubj = ClipperLib::pftNonZero; break;
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case clipper_positive: pftSubj = ClipperLib::pftPositive; break;
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default: pftSubj = ClipperLib::pftNegative;
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}
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switch (m_clipFillType)
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{
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case clipper_even_odd: pftClip = ClipperLib::pftEvenOdd; break;
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case clipper_non_zero: pftClip = ClipperLib::pftNonZero; break;
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case clipper_positive: pftClip = ClipperLib::pftPositive; break;
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default: pftClip = ClipperLib::pftNegative;
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}
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m_clipper.Clear();
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switch( m_operation ) {
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case clipper_or:
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{
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m_clipper.AddPolygons( m_poly_a , ClipperLib::ptSubject );
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m_clipper.AddPolygons( m_poly_b , ClipperLib::ptClip );
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m_clipper.Execute( ClipperLib::ctUnion , m_result , pftSubj, pftClip);
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break;
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}
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case clipper_and:
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{
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m_clipper.AddPolygons( m_poly_a , ClipperLib::ptSubject );
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m_clipper.AddPolygons( m_poly_b , ClipperLib::ptClip );
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m_clipper.Execute( ClipperLib::ctIntersection , m_result, pftSubj, pftClip );
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break;
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}
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case clipper_xor:
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{
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m_clipper.AddPolygons( m_poly_a , ClipperLib::ptSubject );
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m_clipper.AddPolygons( m_poly_b , ClipperLib::ptClip );
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m_clipper.Execute( ClipperLib::ctXor , m_result, pftSubj, pftClip );
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break;
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}
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case clipper_a_minus_b:
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{
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m_clipper.AddPolygons( m_poly_a , ClipperLib::ptSubject );
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m_clipper.AddPolygons( m_poly_b , ClipperLib::ptClip );
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m_clipper.Execute( ClipperLib::ctDifference , m_result, pftSubj, pftClip );
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break;
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}
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case clipper_b_minus_a:
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{
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m_clipper.AddPolygons( m_poly_b , ClipperLib::ptSubject );
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m_clipper.AddPolygons( m_poly_a , ClipperLib::ptClip );
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m_clipper.Execute( ClipperLib::ctDifference , m_result, pftSubj, pftClip );
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break;
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}
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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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void conv_clipper<VSA, VSB>::end_contour( ClipperLib::Polygons &p)
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{
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unsigned i, len;
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if( m_vertex_accumulator.size() < 3 ) return;
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len = p.size();
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p.resize(len+1);
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p[len].resize(m_vertex_accumulator.size());
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for( i = 0 ; i < m_vertex_accumulator.size() ; i++ )
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p[len][i] = m_vertex_accumulator[i];
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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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void conv_clipper<VSA, VSB>::add_vertex_(double &x, double &y)
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{
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ClipperLib::IntPoint v;
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v.X = Round(x * m_scaling_factor);
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v.Y = Round(y * m_scaling_factor);
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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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bool conv_clipper<VSA, VSB>::next_poly()
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{
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m_expoly++;
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if (m_expoly >= (int) m_result.size())
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return false;
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//std::cout << "next poly: " << m_expoly << " " << m_result.size() << " "<< m_result[m_expoly].outer.size() <<"\n";
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m_contour = -2;
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m_vertex = -1;
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return true;
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}
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template<class VSA, class VSB>
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bool conv_clipper<VSA, VSB>::next_contour()
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{
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m_contour++;
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if (m_contour < 0){
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// outer ring
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//if (!m_result[m_expoly].outer)
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// return false;
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} else {
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// inner rings
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if(m_contour >= (int)m_result[m_expoly].holes.size())
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return false;
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}
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// std::cout << "next contour: " << m_contour << "\n";
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m_vertex =-1;
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return true;
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}
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//------------------------------------------------------------------------------
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template<class VSA, class VSB>
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bool conv_clipper<VSA, VSB>::next_vertex(double *x, double *y)
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{
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m_vertex++;
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//std::cout << "next vertex: " << m_vertex << "\n";
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if (m_contour < 0)
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{
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if (m_vertex >= (int) m_result[m_expoly].outer.size())
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return false;
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*x = (double) m_result[m_expoly].outer[m_vertex].X / m_scaling_factor;
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*y = (double) m_result[m_expoly].outer[m_vertex].Y / m_scaling_factor;
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}
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else
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{
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if (m_vertex >= (int) m_result[m_expoly].holes[m_contour].size())
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return false;
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*x = (double) m_result[m_expoly].holes[m_contour][m_vertex].X
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/ m_scaling_factor;
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*y = (double) m_result[m_expoly].holes[m_contour][m_vertex].Y
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/ m_scaling_factor;
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}
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return true;
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}
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//------------------------------------------------------------------------------
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template<class VSA, class VSB>
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unsigned conv_clipper<VSA, VSB>::vertex(double *x, double *y)
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{
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if (m_status == status_next)
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{
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if (next_poly())
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m_status = status_move_to;
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else
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return path_cmd_stop;
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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())
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{
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if (next_vertex(x, y))
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{
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m_status = status_line_to;
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return path_cmd_move_to;
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}
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}
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if (next_poly())
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{
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m_status = status_move_to;
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// return two times SEG_CLOSE to indicate
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// that all holes of this ExPolygon are finished
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return path_cmd_end_poly | path_flags_close;
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}
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else
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return path_cmd_stop;
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}
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else
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{
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if (next_vertex(x, y))
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{
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return path_cmd_line_to;
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}
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else
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{
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m_status = status_move_to;
|
||
|
|
return path_cmd_end_poly | path_flags_close;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
|
||
|
|
} //namespace agg
|
||
|
|
#endif //AGG_CONV_CLIPPER_INCLUDED
|