question: public Edge findEdgeInSameDirection ( Coordinate p0 , Coordinate p1 ) { for ( int i = 0 ; i < edges . size ( ) ; i ++ ) { Edge e = ( Edge ) edges . get ( i ) ; Coordinate [ ] eCoord = e . getCoordinates ( ) ; if ( matchInSameDirection ( p0 , p1 , eCoord [ 0 ] , eCoord [ 1 ] ) ) return e ; if ( matchInSameDirection ( p0 , p1 , eCoord [ eCoord . length - 1 ] , eCoord [ eCoord . length - 2 ] ) ) return e ; } return null ; }
target:  Returns the edge which starts at p0 and whose first segment is parallel to p1