Ejemplo n.º 1
0
        /// <summary>
        /// This method is called by clients of the EdgeIntersector class to test for and add
        /// intersections for two segments of the edges being intersected.
        /// Note that clients (such as MonotoneChainEdges) may choose not to intersect
        /// certain pairs of segments for efficiency reasons.
        /// </summary>
        /// <param name="e0"></param>
        /// <param name="segIndex0"></param>
        /// <param name="e1"></param>
        /// <param name="segIndex1"></param>
        public void AddIntersections(Edge e0, int segIndex0, Edge e1, int segIndex1)
        {
            if ( e0 == e1 && segIndex0 == segIndex1) return;
            _numTests++;
            Coordinate p00 = e0.Coordinates[segIndex0];
            Coordinate p01 = e0.Coordinates[segIndex0 + 1];
            Coordinate p10 = e1.Coordinates[segIndex1];
            Coordinate p11 = e1.Coordinates[segIndex1 + 1];

            _lineIntersector.ComputeIntersection( p00, p01, p10, p11);

            if ( _lineIntersector.HasIntersection() )
            {
                if ( _recordIsolated )
                {
                    e0.SetIsIsolated( false );
                    e1.SetIsIsolated( false );

                }
                //intersectionFound = true;
                _numIntersections++;
                // if the segments are adjacent they have at least one trivial intersection,
                // the shared endpoint.  Don't bother adding it if it is the
                // only intersection.
                if ( !IsTrivialIntersection( e0, segIndex0, e1, segIndex1) )
                {
                    _hasIntersection = true;
                    if ( _includeProper || ! _lineIntersector.IsProper() )
                    {
                        //Debug.println(_lineIntersector);
                        e0.AddIntersections( _lineIntersector, segIndex0, 0 );
                        e1.AddIntersections( _lineIntersector, segIndex1, 1 );
                    }
                    if ( _lineIntersector.IsProper() )
                    {
                        _properIntersectionPoint = (Coordinate) _lineIntersector.GetIntersection(0).Clone();
                        _hasProper = true;
                        if ( !IsBoundaryPoint( _lineIntersector, _bdyNodes) )
                        {
                            _hasProperInterior = true;
                        }
                    }
                } // if ( !IsTrivialIntersection( e0, segIndex0, e1, segIndex1) )

            } // if ( _lineIntersector.HasIntersection() )
        }