add low precision intersection_generator mode for faster graph traversal

2016-11-10 16:05:24 +01:00
parent b2c27fbd25
commit a49bd70985
5 changed files with 101 additions and 17 deletions
@@ -49,6 +49,17 @@ class CoordinateExtractor
    std::vector<util::Coordinate> GetForwardCoordinatesAlongRoad(const NodeID from,
                                                                 const EdgeID turn_edge) const;

+    // a less precise way to compute coordinates along a route. Due to the heavy interaction of
+    // graph traversal and turn instructions, we often don't care for high precision. We only want
+    // to check for available connections in order, or find (with room for error) the straightmost
+    // turn. This function will offer a bit more error potential but allow for much higher
+    // performance
+    OSRM_ATTR_WARN_UNUSED
+    util::Coordinate GetCoordinateCloseToTurn(const NodeID from_node,
+                                              const EdgeID turn_edge,
+                                              const bool traversed_in_reverse,
+                                              const NodeID to_node) const;
+
    /* When extracting the coordinates, we first extract all coordinates. We don't care about most
     * of them, though.
     *