// a
// |
// |
// v
// For an intersection from_node --via_edi--> turn_node ----> c
// ^
// |
// |
// b
// This functions returns _all_ turns as if the graph was undirected.
// That means we not only get (from_node, turn_node, c) in the above example
// but also (from_node, turn_node, a), (from_node, turn_node, b). These turns are
// marked as invalid and only needed for intersection classification.
Intersection IntersectionGenerator::getConnectedRoads(const NodeID from_node,
const EdgeID via_eid) const
{
Intersection intersection;
const NodeID turn_node = node_based_graph.GetTarget(via_eid);
const NodeID only_restriction_to_node =
restriction_map.CheckForEmanatingIsOnlyTurn(from_node, turn_node);
const bool is_barrier_node = barrier_nodes.find(turn_node) != barrier_nodes.end();
bool has_uturn_edge = false;
bool uturn_could_be_valid = false;
for (const EdgeID onto_edge : node_based_graph.GetAdjacentEdgeRange(turn_node))
{
BOOST_ASSERT(onto_edge != SPECIAL_EDGEID);
const NodeID to_node = node_based_graph.GetTarget(onto_edge);
bool turn_is_valid =
// reverse edges are never valid turns because the resulting turn would look like this:
// from_node --via_edge--> turn_node <--onto_edge-- to_node
// however we need this for capture intersection shape for incoming one-ways
!node_based_graph.GetEdgeData(onto_edge).reversed &&
// we are not turning over a barrier
(!is_barrier_node || from_node == to_node) &&
// We are at an only_-restriction but not at the right turn.
(only_restriction_to_node == SPECIAL_NODEID || to_node == only_restriction_to_node) &&
// the turn is not restricted
!restriction_map.CheckIfTurnIsRestricted(from_node, turn_node, to_node);
auto angle = 0.;
if (from_node == to_node)
{
uturn_could_be_valid = turn_is_valid;
if (turn_is_valid && !is_barrier_node)
{
// we only add u-turns for dead-end streets.
if (node_based_graph.GetOutDegree(turn_node) > 1)
{
auto number_of_emmiting_bidirectional_edges = 0;
for (auto edge : node_based_graph.GetAdjacentEdgeRange(turn_node))
{
auto target = node_based_graph.GetTarget(edge);
auto reverse_edge = node_based_graph.FindEdge(target, turn_node);
BOOST_ASSERT(reverse_edge != SPECIAL_EDGEID);
if (!node_based_graph.GetEdgeData(reverse_edge).reversed)
{
++number_of_emmiting_bidirectional_edges;
}
}
// is a dead-end, only possible road is to go back
turn_is_valid = number_of_emmiting_bidirectional_edges <= 1;
}
}
has_uturn_edge = true;
BOOST_ASSERT(angle >= 0. && angle < std::numeric_limits<double>::epsilon());
}
else
{
// unpack first node of second segment if packed
const auto first_coordinate = getRepresentativeCoordinate(
from_node, turn_node, via_eid, INVERT, compressed_edge_container, node_info_list);
const auto third_coordinate = getRepresentativeCoordinate(
turn_node, to_node, onto_edge, !INVERT, compressed_edge_container, node_info_list);
angle = util::coordinate_calculation::computeAngle(
first_coordinate, node_info_list[turn_node], third_coordinate);
if (std::abs(angle) < std::numeric_limits<double>::epsilon())
has_uturn_edge = true;
}
intersection.push_back(ConnectedRoad(
TurnOperation{onto_edge, angle, {TurnType::Invalid, DirectionModifier::UTurn}},
turn_is_valid));
}
// We hit the case of a street leading into nothing-ness. Since the code here assumes that this
// will never happen we add an artificial invalid uturn in this case.
if (!has_uturn_edge)
{
intersection.push_back(
{TurnOperation{via_eid, 0., {TurnType::Invalid, DirectionModifier::UTurn}}, false});
}
const auto ByAngle = [](const ConnectedRoad &first, const ConnectedRoad second) {
return first.turn.angle < second.turn.angle;
};
std::sort(std::begin(intersection), std::end(intersection), ByAngle);
BOOST_ASSERT(intersection[0].turn.angle >= 0. &&
intersection[0].turn.angle < std::numeric_limits<double>::epsilon());
const auto valid_count =
boost::count_if(intersection, [](const ConnectedRoad &road) { return road.entry_allowed; });
if (0 == valid_count && uturn_could_be_valid)
intersection[0].entry_allowed = true;
return mergeSegregatedRoads(std::move(intersection));
}
// a
// |
// |
// v
// For an intersection from_node --via_edi--> turn_node ----> c
// ^
// |
// |
// b
// This functions returns _all_ turns as if the graph was undirected.
// That means we not only get (from_node, turn_node, c) in the above example
// but also (from_node, turn_node, a), (from_node, turn_node, b). These turns are
// marked as invalid and only needed for intersection classification.
Intersection IntersectionGenerator::GetConnectedRoads(const NodeID from_node,
const EdgeID via_eid) const
{
Intersection intersection;
const NodeID turn_node = node_based_graph.GetTarget(via_eid);
// reserve enough items (+ the possibly missing u-turn edge)
intersection.reserve(node_based_graph.GetOutDegree(turn_node) + 1);
const NodeID only_restriction_to_node = [&]() {
// If only restrictions refer to invalid ways somewhere far away, we rather ignore the
// restriction than to not route over the intersection at all.
const auto only_restriction_to_node =
restriction_map.CheckForEmanatingIsOnlyTurn(from_node, turn_node);
if (only_restriction_to_node != SPECIAL_NODEID)
{
// check if we can find an edge in the edge-rage
for (const auto onto_edge : node_based_graph.GetAdjacentEdgeRange(turn_node))
if (only_restriction_to_node == node_based_graph.GetTarget(onto_edge))
return only_restriction_to_node;
}
// Ignore broken only restrictions.
return SPECIAL_NODEID;
}();
const bool is_barrier_node = barrier_nodes.find(turn_node) != barrier_nodes.end();
bool has_uturn_edge = false;
bool uturn_could_be_valid = false;
const util::Coordinate turn_coordinate = node_info_list[turn_node];
const auto intersection_lanes = getLaneCountAtIntersection(turn_node, node_based_graph);
for (const EdgeID onto_edge : node_based_graph.GetAdjacentEdgeRange(turn_node))
{
BOOST_ASSERT(onto_edge != SPECIAL_EDGEID);
const NodeID to_node = node_based_graph.GetTarget(onto_edge);
const auto &onto_data = node_based_graph.GetEdgeData(onto_edge);
bool turn_is_valid =
// reverse edges are never valid turns because the resulting turn would look like this:
// from_node --via_edge--> turn_node <--onto_edge-- to_node
// however we need this for capture intersection shape for incoming one-ways
!onto_data.reversed &&
// we are not turning over a barrier
(!is_barrier_node || from_node == to_node) &&
// We are at an only_-restriction but not at the right turn.
(only_restriction_to_node == SPECIAL_NODEID || to_node == only_restriction_to_node) &&
// the turn is not restricted
!restriction_map.CheckIfTurnIsRestricted(from_node, turn_node, to_node);
auto angle = 0.;
double bearing = 0.;
// The first coordinate (the origin) can depend on the number of lanes turning onto,
// just as the target coordinate can. Here we compute the corrected coordinate for the
// incoming edge.
const auto first_coordinate = coordinate_extractor.GetCoordinateAlongRoad(
from_node, via_eid, INVERT, turn_node, intersection_lanes);
if (from_node == to_node)
{
bearing = util::coordinate_calculation::bearing(turn_coordinate, first_coordinate);
uturn_could_be_valid = turn_is_valid;
if (turn_is_valid && !is_barrier_node)
{
// we only add u-turns for dead-end streets.
if (node_based_graph.GetOutDegree(turn_node) > 1)
{
auto number_of_emmiting_bidirectional_edges = 0;
for (auto edge : node_based_graph.GetAdjacentEdgeRange(turn_node))
{
auto target = node_based_graph.GetTarget(edge);
auto reverse_edge = node_based_graph.FindEdge(target, turn_node);
BOOST_ASSERT(reverse_edge != SPECIAL_EDGEID);
if (!node_based_graph.GetEdgeData(reverse_edge).reversed)
{
++number_of_emmiting_bidirectional_edges;
}
}
// is a dead-end, only possible road is to go back
turn_is_valid = number_of_emmiting_bidirectional_edges <= 1;
}
}
has_uturn_edge = true;
BOOST_ASSERT(angle >= 0. && angle < std::numeric_limits<double>::epsilon());
}
else
{
// the default distance we lookahead on a road. This distance prevents small mapping
// errors to impact the turn angles.
const auto third_coordinate = coordinate_extractor.GetCoordinateAlongRoad(
turn_node, onto_edge, !INVERT, to_node, intersection_lanes);
angle = util::coordinate_calculation::computeAngle(
first_coordinate, turn_coordinate, third_coordinate);
bearing = util::coordinate_calculation::bearing(turn_coordinate, third_coordinate);
if (std::abs(angle) < std::numeric_limits<double>::epsilon())
has_uturn_edge = true;
}
intersection.push_back(
ConnectedRoad(TurnOperation{onto_edge,
angle,
bearing,
{TurnType::Invalid, DirectionModifier::UTurn},
INVALID_LANE_DATAID},
turn_is_valid));
}
// We hit the case of a street leading into nothing-ness. Since the code here assumes
// that this
// will never happen we add an artificial invalid uturn in this case.
if (!has_uturn_edge)
{
const auto first_coordinate = coordinate_extractor.GetCoordinateAlongRoad(
from_node,
via_eid,
INVERT,
turn_node,
node_based_graph.GetEdgeData(via_eid).road_classification.GetNumberOfLanes());
const double bearing =
util::coordinate_calculation::bearing(turn_coordinate, first_coordinate);
intersection.push_back({TurnOperation{via_eid,
0.,
bearing,
{TurnType::Invalid, DirectionModifier::UTurn},
INVALID_LANE_DATAID},
false});
}
std::sort(std::begin(intersection),
std::end(intersection),
std::mem_fn(&ConnectedRoad::compareByAngle));
BOOST_ASSERT(intersection[0].angle >= 0. &&
intersection[0].angle < std::numeric_limits<double>::epsilon());
const auto valid_count =
boost::count_if(intersection, [](const ConnectedRoad &road) { return road.entry_allowed; });
if (0 == valid_count && uturn_could_be_valid)
{
// after intersections sorting by angles, find the u-turn with (from_node ==
// to_node)
// that was inserted together with setting uturn_could_be_valid flag
std::size_t self_u_turn = 0;
while (self_u_turn < intersection.size() &&
intersection[self_u_turn].angle < std::numeric_limits<double>::epsilon() &&
from_node != node_based_graph.GetTarget(intersection[self_u_turn].eid))
{
++self_u_turn;
}
BOOST_ASSERT(from_node == node_based_graph.GetTarget(intersection[self_u_turn].eid));
intersection[self_u_turn].entry_allowed = true;
}
return intersection;
}