108 lines
4.5 KiB
C++
108 lines
4.5 KiB
C++
#ifndef OSRM_EXTRACTOR_GUIDANCE_INTERSECTION_GENERATOR_HPP_
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#define OSRM_EXTRACTOR_GUIDANCE_INTERSECTION_GENERATOR_HPP_
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#include "extractor/compressed_edge_container.hpp"
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#include "extractor/guidance/intersection.hpp"
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#include "extractor/query_node.hpp"
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#include "extractor/restriction_map.hpp"
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#include "util/attributes.hpp"
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#include "util/name_table.hpp"
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#include "util/node_based_graph.hpp"
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#include "util/typedefs.hpp"
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#include <unordered_set>
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#include <vector>
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namespace osrm
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{
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namespace extractor
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{
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namespace guidance
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{
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// The Intersection Generator is given a turn location and generates an intersection representation
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// from it. For this all turn possibilities are analysed.
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// We consider turn restrictions to indicate possible turns. U-turns are generated based on profile
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// decisions.
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class IntersectionGenerator
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{
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public:
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IntersectionGenerator(const util::NodeBasedDynamicGraph &node_based_graph,
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const RestrictionMap &restriction_map,
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const std::unordered_set<NodeID> &barrier_nodes,
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const std::vector<QueryNode> &node_info_list,
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const CompressedEdgeContainer &compressed_edge_container);
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Intersection operator()(const NodeID nid, const EdgeID via_eid) const;
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// Graph Compression cannot compress every setting. For example any barrier/traffic light cannot
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// be compressed. As a result, a simple road of the form `a ----- b` might end up as having an
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// intermediate intersection, if there is a traffic light in between. If we want to look farther
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// down a road, finding the next actual decision requires the look at multiple intersections.
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// Here we follow the road until we either reach a dead end or find the next intersection with
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// more than a single next road.
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Intersection GetActualNextIntersection(const NodeID starting_node,
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const EdgeID via_edge,
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NodeID *resulting_from_node,
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EdgeID *resulting_via_edge) const;
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private:
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const util::NodeBasedDynamicGraph &node_based_graph;
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const RestrictionMap &restriction_map;
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const std::unordered_set<NodeID> &barrier_nodes;
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const std::vector<QueryNode> &node_info_list;
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const CompressedEdgeContainer &compressed_edge_container;
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// Check for restrictions/barriers and generate a list of valid and invalid turns present at
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// the
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// node reached
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// from `from_node` via `via_eid`
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// The resulting candidates have to be analysed for their actual instructions later on.
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OSRM_ATTR_WARN_UNUSED
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Intersection GetConnectedRoads(const NodeID from_node, const EdgeID via_eid) const;
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// check if two indices in an intersection can be seen as a single road in the perceived
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// intersection representation See below for an example. Utility function for
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// MergeSegregatedRoads
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bool CanMerge(const NodeID intersection_node,
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const Intersection &intersection,
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std::size_t first_index,
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std::size_t second_index) const;
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// Merge segregated roads to omit invalid turns in favor of treating segregated roads as
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// one.
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// This function combines roads the following way:
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//
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// * *
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// * is converted to *
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// v ^ +
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// v ^ +
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//
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// The treatment results in a straight turn angle of 180º rather than a turn angle of approx
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// 160
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OSRM_ATTR_WARN_UNUSED
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Intersection MergeSegregatedRoads(const NodeID intersection_node,
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Intersection intersection) const;
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// The counterpiece to mergeSegregatedRoads. While we can adjust roads that split up at the
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// intersection itself, it can also happen that intersections are connected to joining roads.
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//
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// * *
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// * is converted to *
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// v a --- a ---
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// v ^ +
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// v ^ +
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// b
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//
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// for the local view of b at a.
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OSRM_ATTR_WARN_UNUSED
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Intersection AdjustForJoiningRoads(const NodeID node_at_intersection,
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Intersection intersection) const;
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};
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} // namespace guidance
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} // namespace extractor
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} // namespace osrm
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#endif /* OSRM_EXTRACTOR_GUIDANCE_INTERSECTION_GENERATOR_HPP_ */
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