Package org.opentrafficsim.road.gtu.lane.perception.categories.neighbors

Class DirectNeighborsPerception

    • Field Detail

      • LOOKAHEAD

        protected static final org.opentrafficsim.base.parameters.ParameterTypeLength LOOKAHEAD
        Look ahead parameter type.

      • LOOKBACK

        protected static final org.opentrafficsim.base.parameters.ParameterTypeLength LOOKBACK
        Look back parameter type.

    • Constructor Detail

      • DirectNeighborsPerception

        public DirectNeighborsPerception​(LanePerception perception,
                                 HeadwayGtuType headwayGtuType)
        Parameters:
        perception - LanePerception; perception
        headwayGtuType - HeadwayGtuType; type of headway gtu to generate

      • DirectNeighborsPerception

        public DirectNeighborsPerception​(LanePerception perception,
                                 HeadwayGtuType headwayGtuType,
                                 HeadwayGtuType headwayGtuTypeGap)
        Parameters:
        perception - LanePerception; perception
        headwayGtuType - HeadwayGtuType; type of headway gtu to generate
        headwayGtuTypeGap - HeadwayGtuType; type of headway gtu to assess gaps

    • Method Detail

      • getFirstLeaders

        public final SortedSet<HeadwayGTU> getFirstLeaders​(LateralDirectionality lat)
                                            throws org.opentrafficsim.base.parameters.ParameterException,
                                                   NullPointerException,
                                                   IllegalArgumentException
        Set of leaders on a lane, which is usually 0 or 1, but possibly more in case of a downstream split with no intermediate GTU. This is shown below. Suppose A needs to go straight. If A considers a lane change to the left, both GTUs B (who's tail ~ is still on the straight lane) and C need to be considered for whether it's safe to do so. In case of multiple splits close to one another, the returned set may contain even more than 2 leaders. Leaders are sorted by headway value. 
                  | |
 _________/B/_____
 _ _?_ _ _~_ _C_ _
 _ _A_ _ _ _ _ _ _
 _________________
        Only vehicles who's rear is beyond the own front are considered, no alongside vehicles.

        Specified by:
        getFirstLeaders in interface NeighborsPerception
        Parameters:
        lat - LateralDirectionality; LEFT or RIGHT
        Returns:
        list of followers on a lane
        Throws:
        org.opentrafficsim.base.parameters.ParameterException - if parameter is not defined
        NullPointerException - if lat is null
        IllegalArgumentException - if lat is NONE

      • getFirstFollowers

        public final SortedSet<HeadwayGTU> getFirstFollowers​(LateralDirectionality lat)
                                              throws org.opentrafficsim.base.parameters.ParameterException,
                                                     NullPointerException,
                                                     IllegalArgumentException
        Set of followers on a lane, which is usually 0 or 1, but possibly more in case of an upstream merge with no intermediate GTU. This is shown below. If A considers a lane change to the left, both GTUs B and C need to be considered for whether it's safe to do so. In case of multiple merges close to one another, the returned set may contain even more than 2 followers. Followers are sorted by tailway value. 
                | |
        |C| 
 ________\ \______
 _ _B_|_ _ _ _ _?_
 _ _ _|_ _ _ _ _A_ 
 _____|___________
        Only vehicles who's front is before the own rear are considered, no alongside vehicles.

        Specified by:
        getFirstFollowers in interface NeighborsPerception
        Parameters:
        lat - LateralDirectionality; LEFT or RIGHT
        Returns:
        list of followers on a lane
        Throws:
        org.opentrafficsim.base.parameters.ParameterException - if parameter is not defined
        NullPointerException - if lat is null
        IllegalArgumentException - if lat is NONE

      • computeGtuAlongside

        public boolean computeGtuAlongside​(LateralDirectionality lat)
        Computes whether there is a GTU alongside.
        Parameters:
        lat - LateralDirectionality; lateral directionality
        Returns:
        boolean; whether there is a GTU alongside

      • getLeaders

        public final PerceptionCollectable<HeadwayGTU,​LaneBasedGTU> getLeaders​(RelativeLane lane)
        Set of leaders on a lane, including adjacent GTU's who's FRONT is ahead of the own vehicle FRONT. Leaders are sorted by headway value.
        Specified by:
        getLeaders in interface NeighborsPerception
        Parameters:
        lane - RelativeLane; relative lateral lane
        Returns:
        set of leaders on a lane, including adjacent GTU's who's FRONT is ahead of the own vehicle FRONT

      • getFollowers

        public final PerceptionCollectable<HeadwayGTU,​LaneBasedGTU> getFollowers​(RelativeLane lane)
        Set of followers on a lane, including adjacent GTU's who's FRONT is back of the own vehicle FRONT. Follower are are sorted by distance.
        Specified by:
        getFollowers in interface NeighborsPerception
        Parameters:
        lane - RelativeLane; relative lateral lane
        Returns:
        set of followers on a lane, including adjacent GTU's who's FRONT is back of the own vehicle FRONT