Intersection TurnAnalysis::assignTurnTypes(const NodeID from_nid,
const EdgeID via_eid,
Intersection intersection) const
{
// Roundabouts are a main priority. If there is a roundabout instruction present, we process the
// turn as a roundabout
if (roundabout_handler.canProcess(from_nid, via_eid, intersection))
{
intersection = roundabout_handler(from_nid, via_eid, std::move(intersection));
}
else
{
// set initial defaults for normal turns and modifier based on angle
intersection = setTurnTypes(from_nid, via_eid, std::move(intersection));
if (motorway_handler.canProcess(from_nid, via_eid, intersection))
{
intersection = motorway_handler(from_nid, via_eid, std::move(intersection));
}
else
{
BOOST_ASSERT(turn_handler.canProcess(from_nid, via_eid, intersection));
intersection = turn_handler(from_nid, via_eid, std::move(intersection));
}
}
// Handle sliproads
intersection = sliproad_handler(from_nid, via_eid, std::move(intersection));
// Turn On Ramps Into Off Ramps, if we come from a motorway-like road
if (node_based_graph.GetEdgeData(via_eid).road_classification.IsMotorwayClass())
{
std::for_each(intersection.begin(), intersection.end(), [](ConnectedRoad &road) {
if (road.turn.instruction.type == TurnType::OnRamp)
road.turn.instruction.type = TurnType::OffRamp;
});
}
return intersection;
}
// "Sliproads" occur when we've got a link between two roads (MOTORWAY_LINK, etc), but
// the two roads are *also* directly connected shortly afterwards.
// In these cases, we tag the turn-type as "sliproad", and then in post-processing
// we emit a "turn", instead of "take the ramp"+"merge"
Intersection TurnAnalysis::handleSliproads(const EdgeID source_edge_id,
Intersection intersection) const
{
auto intersection_node_id = node_based_graph.GetTarget(source_edge_id);
const auto linkTest = [this](const ConnectedRoad &road) {
return // isLinkClass(
// node_based_graph.GetEdgeData(road.turn.eid).road_classification.road_class) &&
!node_based_graph.GetEdgeData(road.turn.eid).roundabout && road.entry_allowed &&
angularDeviation(road.turn.angle, STRAIGHT_ANGLE) <= 2 * NARROW_TURN_ANGLE;
};
bool hasNarrow =
std::find_if(intersection.begin(), intersection.end(), linkTest) != intersection.end();
if (!hasNarrow)
return intersection;
const auto source_edge_data = node_based_graph.GetEdgeData(source_edge_id);
// Find the continuation of the intersection we're on
auto next_road = std::find_if(
intersection.begin(),
intersection.end(),
[this, source_edge_data](const ConnectedRoad &road) {
const auto road_edge_data = node_based_graph.GetEdgeData(road.turn.eid);
// Test to see if the source edge and the one we're looking at are the same road
return road_edge_data.road_classification.road_class ==
source_edge_data.road_classification.road_class &&
road_edge_data.name_id != EMPTY_NAMEID &&
road_edge_data.name_id == source_edge_data.name_id && road.entry_allowed &&
angularDeviation(road.turn.angle, STRAIGHT_ANGLE) < FUZZY_ANGLE_DIFFERENCE;
});
const bool hasNext = next_road != intersection.end();
if (!hasNext)
{
return intersection;
}
// Threshold check, if the intersection is too far away, don't bother continuing
const auto &next_road_data = node_based_graph.GetEdgeData(next_road->turn.eid);
if (next_road_data.distance > MAX_SLIPROAD_THRESHOLD)
{
return intersection;
}
const auto next_road_next_intersection =
intersection_generator(intersection_node_id, next_road->turn.eid);
const auto next_intersection_node = node_based_graph.GetTarget(next_road->turn.eid);
std::unordered_set<NameID> target_road_names;
for (const auto &road : next_road_next_intersection)
{
const auto &target_data = node_based_graph.GetEdgeData(road.turn.eid);
target_road_names.insert(target_data.name_id);
}
for (auto &road : intersection)
{
if (linkTest(road))
{
auto target_intersection = intersection_generator(intersection_node_id, road.turn.eid);
for (const auto &candidate_road : target_intersection)
{
const auto &candidate_data = node_based_graph.GetEdgeData(candidate_road.turn.eid);
if (target_road_names.count(candidate_data.name_id) > 0 &&
node_based_graph.GetTarget(candidate_road.turn.eid) == next_intersection_node)
{
road.turn.instruction.type = TurnType::Sliproad;
break;
}
}
}
}
if (next_road->turn.instruction.type == TurnType::Fork)
{
const auto &next_data = node_based_graph.GetEdgeData(next_road->turn.eid);
if (next_data.name_id == source_edge_data.name_id)
{
if (angularDeviation(next_road->turn.angle, STRAIGHT_ANGLE) < 5)
next_road->turn.instruction.type = TurnType::Suppressed;
else
next_road->turn.instruction.type = TurnType::Continue;
next_road->turn.instruction.direction_modifier =
getTurnDirection(next_road->turn.angle);
}
else if (next_data.name_id != EMPTY_NAMEID)
{
next_road->turn.instruction.type = TurnType::NewName;
next_road->turn.instruction.direction_modifier =
getTurnDirection(next_road->turn.angle);
}
else
{
next_road->turn.instruction.type = TurnType::Suppressed;
}
}
return intersection;
}
std::size_t IntersectionHandler::countValid(const Intersection &intersection) const
{
return std::count_if(intersection.begin(), intersection.end(), [](const ConnectedRoad &road) {
return road.entry_allowed;
});
}
std::pair<util::guidance::EntryClass, util::guidance::BearingClass>
classifyIntersection(Intersection intersection)
{
if (intersection.empty())
return {};
std::sort(intersection.begin(),
intersection.end(),
[](const ConnectedRoad &left, const ConnectedRoad &right) {
return left.bearing < right.bearing;
});
util::guidance::EntryClass entry_class;
util::guidance::BearingClass bearing_class;
const bool canBeDiscretized = [&]() {
if (intersection.size() <= 1)
return true;
DiscreteBearing last_discrete_bearing = util::guidance::BearingClass::getDiscreteBearing(
std::round(intersection.back().bearing));
for (const auto road : intersection)
{
const DiscreteBearing discrete_bearing =
util::guidance::BearingClass::getDiscreteBearing(std::round(road.bearing));
if (discrete_bearing == last_discrete_bearing)
return false;
last_discrete_bearing = discrete_bearing;
}
return true;
}();
// finally transfer data to the entry/bearing classes
std::size_t number = 0;
if (canBeDiscretized)
{
if (util::guidance::BearingClass::getDiscreteBearing(intersection.back().bearing) <
util::guidance::BearingClass::getDiscreteBearing(intersection.front().bearing))
{
intersection.insert(intersection.begin(), intersection.back());
intersection.pop_back();
}
for (const auto &road : intersection)
{
if (road.entry_allowed)
entry_class.activate(number);
auto discrete_bearing_class =
util::guidance::BearingClass::getDiscreteBearing(std::round(road.bearing));
bearing_class.add(std::round(discrete_bearing_class *
util::guidance::BearingClass::discrete_step_size));
++number;
}
}
else
{
for (const auto &road : intersection)
{
if (road.entry_allowed)
entry_class.activate(number);
bearing_class.add(std::round(road.bearing));
++number;
}
}
return std::make_pair(entry_class, bearing_class);
}
