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Backport NumLanesToTheRight/NumLanesToTheLeft to support 6ea9f9fdf1

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This commit is contained in:
Daniel Patterson 2017-01-11 16:44:25 -08:00
parent ada0a1e8f8
commit 411313f666
1 changed files with 13 additions and 1 deletions
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14
src/engine/guidance/lane_processing.cpp
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@ -42,7 +42,19 @@ std::vector<RouteStep> anticipateLaneChange(std::vector<RouteStep> steps,
// since at the moment we first group-by and only then do Lane Anticipation selectively.
//
// We do not have a source-target lane mapping, assume worst case for lanes to cross.
const auto to_cross = std::max(step.NumLanesToTheRight(), step.NumLanesToTheLeft());
// The following two lambda functions are backported from
// https://github.com/Project-OSRM/osrm-backend/pull/3474
const auto NumLanesToTheRight = [](const RouteStep &step) -> LaneID {
return step.intersections.front().lanes.first_lane_from_the_right;
};
const auto NumLanesToTheLeft = [](const RouteStep &step) -> LaneID {
LaneID const total = step.intersections.front().lane_description.size();
return total - (step.intersections.front().lanes.lanes_in_turn +
step.intersections.front().lanes.first_lane_from_the_right);
};
const auto to_cross = std::max(NumLanesToTheRight(step), NumLanesToTheLeft(step));
const auto scale = 1 + to_cross;
const auto threshold = scale * min_duration_needed_for_lane_change;