89 lines
4.6 KiB
C++
89 lines
4.6 KiB
C++
#ifndef OSRM_ENGINE_GUIDANCE_COLLAPSE_SCENARIO_DETECTION_HPP_
|
||
#define OSRM_ENGINE_GUIDANCE_COLLAPSE_SCENARIO_DETECTION_HPP_
|
||
|
||
#include "engine/guidance/collapsing_utility.hpp"
|
||
#include "engine/guidance/route_step.hpp"
|
||
|
||
namespace osrm::engine::guidance
|
||
{
|
||
|
||
// check basic collapse preconditions (mode ok, no roundabout types);
|
||
bool basicCollapsePreconditions(const RouteStepIterator first, const RouteStepIterator second);
|
||
|
||
bool basicCollapsePreconditions(const RouteStepIterator first,
|
||
const RouteStepIterator second,
|
||
const RouteStepIterator third);
|
||
|
||
// Staggered intersection are very short zig-zags of a few meters.
|
||
// We do not want to announce these short left-rights or right-lefts:
|
||
//
|
||
// * -> b a -> *
|
||
// | or | becomes a -> b
|
||
// a -> * * -> b
|
||
bool isStaggeredIntersection(const RouteStepIterator step_prior_to_intersection,
|
||
const RouteStepIterator step_entering_intersection,
|
||
const RouteStepIterator step_leaving_intersection);
|
||
|
||
// Two two turns following close after another, we can announce them as a U-Turn if both end up
|
||
// involving the same (segregated) road.
|
||
//
|
||
// b < - y
|
||
// | will be represented by at x, turn around instead of turn left at x, turn left at y
|
||
// a - > x
|
||
bool isUTurn(const RouteStepIterator step_prior_to_intersection,
|
||
const RouteStepIterator step_entering_intersection,
|
||
const RouteStepIterator step_leaving_intersection);
|
||
|
||
// detect oscillating names where a name switch A->B->A occurs. This is often the case due to
|
||
// bridges or tunnels. Any such oszillation is not supposed to show up
|
||
bool isNameOszillation(const RouteStepIterator step_prior_to_intersection,
|
||
const RouteStepIterator step_entering_intersection,
|
||
const RouteStepIterator step_leaving_intersection);
|
||
|
||
// Sometimes, segments names don't match the perceived turns. We try to detect these additional
|
||
// name changes and issue a combined turn.
|
||
//
|
||
// | e |
|
||
// a - b - c
|
||
// d
|
||
//
|
||
// can have `a-b` as one name, `b-c-d` as a second. At `b` we would issue a new name, even though
|
||
// the road turns right after. The offset would only be there due to the broad road at `e`
|
||
bool maneuverPreceededByNameChange(const RouteStepIterator step_prior_to_intersection,
|
||
const RouteStepIterator step_entering_intersection,
|
||
const RouteStepIterator step_leaving_intersection);
|
||
bool maneuverPreceededBySuppressedDirection(const RouteStepIterator step_entering_intersection,
|
||
const RouteStepIterator step_leaving_intersection);
|
||
bool suppressedStraightBetweenTurns(const RouteStepIterator step_entering_intersection,
|
||
const RouteStepIterator step_at_center_of_intersection,
|
||
const RouteStepIterator step_leaving_intersection);
|
||
|
||
bool maneuverSucceededByNameChange(const RouteStepIterator step_entering_intersection,
|
||
const RouteStepIterator step_leaving_intersection);
|
||
bool maneuverSucceededBySuppressedDirection(const RouteStepIterator step_entering_intersection,
|
||
const RouteStepIterator step_leaving_intersection);
|
||
bool nameChangeImmediatelyAfterSuppressed(const RouteStepIterator step_entering_intersection,
|
||
const RouteStepIterator step_leaving_intersection);
|
||
bool closeChoicelessTurnAfterTurn(const RouteStepIterator step_entering_intersection,
|
||
const RouteStepIterator step_leaving_intersection);
|
||
// if modelled turn roads meet in the center of a segregated intersection, we can end up with double
|
||
// choiceless turns
|
||
bool doubleChoiceless(const RouteStepIterator step_entering_intersection,
|
||
const RouteStepIterator step_leaving_intersection);
|
||
|
||
// Due to obvious detection, sometimes we can have straight turns followed by a different turn right
|
||
// next to each other. We combine both turns into one, if the second turn is without choice
|
||
//
|
||
// e
|
||
// a - b - c
|
||
// ' d
|
||
//
|
||
// with a main road `abd`, the turn `continue straight` at `b` and `turn left at `c` will become a
|
||
// `turn left` at `b`
|
||
bool straightTurnFollowedByChoiceless(const RouteStepIterator step_entering_intersection,
|
||
const RouteStepIterator step_leaving_intersection);
|
||
|
||
} // namespace osrm::engine::guidance
|
||
|
||
#endif /* OSRM_ENGINE_GUIDANCE_COLLAPSE_SCENARIO_DETECTION_HPP_ */
|