Explanation Source Code for Killing some bugs (wrong path calculation)

In the source-code the routing calculation is called twice

$length_1 = getting_pathlength($startEdge['source'],$endEdge['target'],$startEdge['gid'],$endEdge['gid'],$point_on_line_begin,$point_on_line_ende);


$length_2 = getting_pathlength($endEdge['source'],$startEdge['target'],$startEdge['gid'],$endEdge['gid'],$point_on_line_begin,$point_on_line_ende);

… and it is calculated how long the pathes are (whole MULTINESTRINGS and the “pieces” between start/end_point and the next geometry

It depends on the length which route is painted:

if ($length_1 < $length_2){



 $sql = "SELECT rt.gid, AsText(rt.the_geom) AS wkt,
                                ST_Length(rt.the_geom) AS length, ".TABLE.".id
                             FROM ".TABLE.",
                                 (SELECT gid, the_geom
                                     FROM dijkstra_sp_delta(
                                         '".TABLE."',
                                         ".$startEdge['source'].",
                                         ".$endEdge['target'].",
                                         3000) WHERE gid!=".$startEdge['gid']." AND gid!=".$endEdge['gid']."
                                  ) as rt
                             WHERE ".TABLE.".gid=rt.gid;";


 }
else
{



 $sql = "SELECT rt.gid, AsText(rt.the_geom) AS wkt,
                                ST_Length(rt.the_geom) AS length, ".TABLE.".id
                             FROM ".TABLE.",
                                 (SELECT gid, the_geom
                                     FROM dijkstra_sp_delta(
                                         '".TABLE."',
                                         ".$endEdge['source'].",
                                         ".$startEdge['target'].",
                                         3000) WHERE gid!=".$startEdge['gid']." AND gid!=".$endEdge['gid']."
                                  ) as rt
                             WHERE ".TABLE.".gid=rt.gid;";



}

And as you see it works: