Added "LinkedList<Agent> followers" to "Agent"

VadereSimulator/src/org/vadere/simulator/models/osm/OptimalStepsModel.java:
- Added TODO to use new list "Agent.getFollowers()".

VadereSimulator/src/org/vadere/simulator/control/TargetChangerController.java

@@ -146,6 +146,7 @@ public class TargetChangerController {
 
         // Make "agent" a follower of "pedToFollow".
         agent.setSingleTarget(pedToFollow.getId(), true);
+        pedToFollow.getFollowers().add(agent);
     }
 
     private void useStaticTargetForAgent(Agent agent) {

VadereSimulator/src/org/vadere/simulator/models/osm/OptimalStepsModel.java

@@ -33,9 +33,7 @@ import org.vadere.simulator.utils.cache.ScenarioCache;
 import org.vadere.state.attributes.Attributes;
 import org.vadere.state.attributes.models.AttributesOSM;
 import org.vadere.state.attributes.scenario.AttributesAgent;
-import org.vadere.state.scenario.DynamicElement;
-import org.vadere.state.scenario.Pedestrian;
-import org.vadere.state.scenario.Topography;
+import org.vadere.state.scenario.*;
 import org.vadere.state.types.OptimizationType;
 import org.vadere.state.types.UpdateType;
 import org.vadere.util.geometry.shapes.VPoint;
@@ -286,10 +284,19 @@ public class OptimalStepsModel implements MainModel, PotentialFieldModel {
 	@Override
 	public void update(final double simTimeInSec) {
 		double timeStepInSec = simTimeInSec - this.lastSimTimeInSec;
+		// TODO: Update followers
 		updateSchemeOSM.update(timeStepInSec, simTimeInSec);
 		lastSimTimeInSec = simTimeInSec;
 	}
 
+	private void updateTargetPotentialsOfFollowers() {
+		for (Target target : topography.getTargets()) {
+			if (target.isTargetPedestrian()) {
+				// TODO: follower.setTargetPotential().
+			}
+		}
+	}
+
 		/*
 	 * At the moment all pedestrians also the initalPedestrians get this.attributesPedestrain!!!
 	 */

VadereSimulator/src/org/vadere/simulator/models/osm/PedestrianOSM.java

@@ -39,6 +39,7 @@ public class PedestrianOSM extends Pedestrian {
 	private final double stepLength;
 	private final double stepDeviation;
 	private final double minStepLength;
+
 	private transient IPotentialFieldTarget potentialFieldTarget;
 	private transient PotentialFieldObstacle potentialFieldObstacle;
 	private transient PotentialFieldAgent potentialFieldPedestrian;
@@ -318,6 +319,10 @@ public class PedestrianOSM extends Pedestrian {
 		this.relevantPedestrians = relevantPedestrians;
 	}
 
+	public void setPotentialFieldTarget(IPotentialFieldTarget potentialFieldTarget) {
+		this.potentialFieldTarget = potentialFieldTarget;
+	}
+
 	public void setCombinedPotentialStrategy(CombinedPotentialStrategy newStrategy) {
 		if (newStrategy == CombinedPotentialStrategy.TARGET_ATTRACTION_STRATEGY) {
 			this.combinedPotentialStrategy = new TargetAttractionStrategy(this.potentialFieldTarget,

VadereState/src/org/vadere/state/scenario/Agent.java

@@ -35,6 +35,8 @@ public abstract class Agent extends DynamicElement {
 	private Vector2D velocity;
 	private double freeFlowSpeed;
 
+	private LinkedList<Agent> followers;
+
 	// TODO: Maybe, add also a List<Agent> of followers for an agent.
 
 	// Constructors
@@ -46,6 +48,8 @@ public abstract class Agent extends DynamicElement {
 		targetIds = new LinkedList<>();
 		nextTargetListIndex = 0;
 		isCurrentTargetAnAgent = false;
+
+		followers = new LinkedList<>();
 	}
 
 	public Agent(AttributesAgent attributesAgent, Random random) {
@@ -75,6 +79,8 @@ public abstract class Agent extends DynamicElement {
 		this.position = other.position;
 		this.velocity = other.velocity;
 		this.freeFlowSpeed = other.freeFlowSpeed;
+
+		this.setFollowers(new LinkedList<>(other.followers));
 	}
 
 	// Getters
@@ -159,6 +165,10 @@ public abstract class Agent extends DynamicElement {
 		return new VCircle(position, attributes.getRadius());
 	}
 
+	public LinkedList<Agent> getFollowers() {
+		return followers;
+	}
+
 	// Setters
 	@Override
 	public void setAttributes(Attributes attributes) {
@@ -270,4 +280,8 @@ public abstract class Agent extends DynamicElement {
         return agentPositions;
     }
 
+	public void setFollowers(LinkedList<Agent> followers) {
+		this.followers = followers;
+	}
+
 }