question: private List findStabbedSegments ( Coordinate stabbingRayLeftPt ) { List stabbedSegments = new ArrayList ( ) ; for ( Iterator i = subgraphs . iterator ( ) ; i . hasNext ( ) ; ) { BufferSubgraph bsg = ( BufferSubgraph ) i . next ( ) ; Envelope env = bsg . getEnvelope ( ) ; if ( stabbingRayLeftPt . y < env . getMinY ( ) || stabbingRayLeftPt . y > env . getMaxY ( ) ) continue ; findStabbedSegments ( stabbingRayLeftPt , bsg . getDirectedEdges ( ) , stabbedSegments ) ; } return stabbedSegments ; }
target:  Finds all non-horizontal segments intersecting the stabbing line. The stabbing line is the ray to the right of stabbingRayLeftPt.