add processor which writes out each small step (PedestrianFootStepProcessor)....

add processor which writes out each small step (PedestrianFootStepProcessor). If the information is available the PostVis will use it.

VadereGui/src/org/vadere/gui/components/view/ScenarioElementView.java

@@ -174,12 +174,12 @@ public class ScenarioElementView extends JPanel implements ISelectScenarioElemen
 			} else {
 				if (scenarioElement instanceof AgentWrapper) {
 					this.txtrTextfiletextarea.setText(
-							StateJsonConverter.serializeObject(((AgentWrapper) scenarioElement).getAgentInitialStore()));
+							StateJsonConverter.serializeObjectPretty(((AgentWrapper) scenarioElement).getAgentInitialStore()));
 				} else if (scenarioElement instanceof Pedestrian) {
-					this.txtrTextfiletextarea.setText(StateJsonConverter.serializeObject(scenarioElement));
+					this.txtrTextfiletextarea.setText(StateJsonConverter.serializeObjectPretty(scenarioElement));
 				} else {
 					this.txtrTextfiletextarea.setText(StateJsonConverter
-							.serializeObject(scenarioElement.getAttributes()));
+							.serializeObjectPretty(scenarioElement.getAttributes()));
 				}
 			}
 		}

VadereGui/src/org/vadere/gui/onlinevisualization/view/OnlinevisualizationRenderer.java

@@ -4,12 +4,15 @@ import java.awt.*;
 import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.Map;
+import java.util.stream.Stream;
 
+import org.jetbrains.annotations.NotNull;
 import org.vadere.gui.components.view.DefaultRenderer;
 import org.vadere.gui.components.view.SimulationRenderer;
 import org.vadere.gui.onlinevisualization.model.OnlineVisualizationModel;
 import org.vadere.gui.renderer.agent.AgentRender;
 import org.vadere.state.scenario.Agent;
+import org.vadere.state.scenario.Pedestrian;
 import org.vadere.util.geometry.shapes.VPoint;
 
 public class OnlinevisualizationRenderer extends SimulationRenderer {
@@ -102,4 +105,18 @@ public class OnlinevisualizationRenderer extends SimulationRenderer {
 			}
 		}
 	}
+
+	/*
+	 * This method should replace pedestrianPositions.get(ped.getId()).addFirst(ped.getPosition());
+	 * However the simulation runs in an separated thread. Therefore, foot steps might be cleared
+	 * before they can be drawn! Solution: deep clone of the topography, which is costly and difficult.
+	 */
+	private Stream<VPoint> getFootStepsPosition(@NotNull final Agent agent) {
+		if(agent instanceof Pedestrian) {
+			return ((Pedestrian) agent).getFootSteps().stream().map(footStep -> footStep.getStart());
+		}
+		else {
+			return Stream.of(agent.getPosition());
+		}
+	}
 }

VadereGui/src/org/vadere/gui/postvisualization/model/PostvisualizationModel.java

@@ -111,7 +111,6 @@ public class PostvisualizationModel extends SimulationModel<PostvisualizationCon
 		// to have fast access to the key values.
 		Map<Integer, Step> map = agentsByStep
 				.keySet().stream()
-				.sorted(stepComparator)
 				.collect(Collectors.toMap(s -> s.getStepNumber(), s -> s));
 
 

VadereSimulator/src/org/vadere/simulator/models/bhm/BehaviouralHeuristicsModel.java

@@ -102,6 +102,11 @@ public class BehaviouralHeuristicsModel implements MainModel {
 	@Override
 	public void update(final double simTimeInSec) {
 
+		// all those foot steps are done in previous sim time steps
+		for(PedestrianBHM ped : pedestrianEventsQueue) {
+			ped.clearFootSteps();
+		}
+
 		// event driven update
 		if (!pedestrianEventsQueue.isEmpty()) {
 			while (pedestrianEventsQueue.peek().getTimeOfNextStep() < simTimeInSec) {

VadereSimulator/src/org/vadere/simulator/models/bhm/PedestrianBHM.java

@@ -13,6 +13,7 @@ import org.vadere.state.scenario.Obstacle;
 import org.vadere.state.scenario.Pedestrian;
 import org.vadere.state.scenario.Target;
 import org.vadere.state.scenario.Topography;
+import org.vadere.state.simulation.FootStep;
 import org.vadere.util.geometry.shapes.Vector2D;
 import org.vadere.util.geometry.shapes.VLine;
 import org.vadere.util.geometry.shapes.VPoint;
@@ -152,9 +153,11 @@ public class PedestrianBHM extends Pedestrian {
 		updateTargetDirection();
 
 		this.nextPosition = navigation.getNavigationPosition();
-
+		VPoint position = getPosition();
 		makeStep();
 
+		getFootSteps().add(new FootStep(position, getPosition(), timeOfNextStep, timeOfNextStep + durationNextStep));
+
 		this.timeOfNextStep = timeOfNextStep + durationNextStep;
 	}
 

VadereSimulator/src/org/vadere/simulator/models/bmm/BiomechanicsModel.java

@@ -3,6 +3,7 @@ package org.vadere.simulator.models.bmm;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Random;
+import java.util.stream.Collectors;
 
 import org.jetbrains.annotations.NotNull;
 import org.vadere.annotation.factories.models.ModelClass;
@@ -15,6 +16,7 @@ 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.simulation.FootStep;
 import org.vadere.util.geometry.shapes.VPoint;
 import org.vadere.util.geometry.shapes.VShape;
 
@@ -92,6 +94,8 @@ public class BiomechanicsModel implements MainModel {
 	public void update(final double simTimeInSec) {
 		double deltaTime = simTimeInSec - lastSimTimeInSec;
 
+		List<VPoint> positions = pedestriansBMM.stream().map(ped -> ped.getPosition()).collect(Collectors.toList());
+
 		for (PedestrianBMM agent : pedestriansBMM) {
 			agent.update(simTimeInSec, deltaTime);
 		}
@@ -104,6 +108,12 @@ public class BiomechanicsModel implements MainModel {
 			agent.reverseCollisions();
 		}
 
+		for(int i = 0; i < pedestriansBMM.size(); i++) {
+			PedestrianBMM agent = pedestriansBMM.get(i);
+			agent.clearFootSteps();
+			agent.getFootSteps().add(new FootStep(positions.get(i), agent.getPosition(), lastSimTimeInSec, simTimeInSec));
+		}
+
 		this.lastSimTimeInSec = simTimeInSec;
 	}
 

VadereSimulator/src/org/vadere/simulator/models/ode/ODEModel.java

 package org.vadere.simulator.models.ode;
 
 import java.util.Collection;
+import java.util.List;
 import java.util.Random;
+import java.util.stream.Collectors;
 
 import org.apache.commons.math3.exception.MathIllegalNumberException;
 import org.apache.commons.math3.ode.FirstOrderIntegrator;
@@ -13,6 +15,7 @@ import org.vadere.state.scenario.Car;
 import org.vadere.state.scenario.DynamicElement;
 import org.vadere.state.scenario.Pedestrian;
 import org.vadere.state.scenario.Topography;
+import org.vadere.state.simulation.FootStep;
 import org.vadere.state.types.ScenarioElementType;
 import org.vadere.util.geometry.shapes.Vector2D;
 import org.vadere.util.geometry.shapes.VPoint;
@@ -72,6 +75,9 @@ public abstract class ODEModel<T extends DynamicElement, TAttributes extends Att
 		// get pedestrian and car data
 		Collection<T> dynamicElements = topography.getElements(type);
 
+		List<T> orderedDynamicElements = topography.getElements(type).stream().collect(Collectors.toList());
+		List<VPoint> positions = orderedDynamicElements.stream().map(ped -> ped.getPosition()).collect(Collectors.toList());
+
 		double[] y;
 
 		// if no peds are present, return
@@ -117,6 +123,15 @@ public abstract class ODEModel<T extends DynamicElement, TAttributes extends Att
 			}
 
 			updateElementPositions(type, simTimeInSec, topography, equations, y);
+
+			for(int i = 0; i < orderedDynamicElements.size(); i++) {
+				DynamicElement element = orderedDynamicElements.get(i);
+				if (element.getType() == ScenarioElementType.PEDESTRIAN) {
+					Pedestrian pedestrian = (Pedestrian)element;
+					pedestrian.clearFootSteps();
+					pedestrian.getFootSteps().add(new FootStep(positions.get(i), pedestrian.getPosition(), lastSimTimeInSec, simTimeInSec));
+				}
+			}
 		}
 
 		// reset the time
@@ -128,8 +143,7 @@ public abstract class ODEModel<T extends DynamicElement, TAttributes extends Att
 	 * double vector.
 	 * The {@link AbstractModelEquations} are used to get the correct positions from the vector.
 	 */
-	public static <T extends DynamicElement> void updateElementPositions(Class<T> type, double simTimeInSec,
-			Topography topography, AbstractModelEquations equations, double[] y) {
+	public static <T extends DynamicElement> void updateElementPositions(Class<T> type, double t, Topography topography, AbstractModelEquations equations, double[] y) {
 
 		Collection<T> dynamicElements = topography.getElements(type);
 

VadereSimulator/src/org/vadere/simulator/models/osm/updateScheme/UpdateSchemeEventDriven.java

@@ -25,9 +25,8 @@ public class UpdateSchemeEventDriven implements UpdateSchemeOSM {
 
 	@Override
 	public void update(final double timeStepInSec, final double currentTimeInSec) {
-		for(PedestrianOSM pedestrianOSM : topography.getElements(PedestrianOSM.class)) {
-			pedestrianOSM.clearStrides();
-		}
+
+		clearStrides(topography);
 
 		if(!pedestrianEventsQueue.isEmpty()) {
 			// event driven update ignores time credits!

VadereSimulator/src/org/vadere/simulator/models/osm/updateScheme/UpdateSchemeOSM.java

@@ -11,6 +11,7 @@ import org.vadere.state.scenario.DynamicElementAddListener;
 import org.vadere.state.scenario.DynamicElementRemoveListener;
 import org.vadere.state.scenario.Pedestrian;
 import org.vadere.state.scenario.Topography;
+import org.vadere.state.simulation.FootStep;
 import org.vadere.state.types.UpdateType;
 import org.vadere.util.geometry.shapes.Vector2D;
 import org.vadere.util.geometry.shapes.VPoint;
@@ -28,6 +29,16 @@ public interface UpdateSchemeOSM extends DynamicElementRemoveListener<Pedestrian
 
 	void update(double timeStepInSec, double currentTimeInSec);
 
+	default void clearStrides(@NotNull final Topography topography) {
+		/**
+		 * strides and foot steps have no influence on the simulation itself, i.e. they are saved to analyse trajectories
+		 */
+		for(PedestrianOSM pedestrianOSM : topography.getElements(PedestrianOSM.class)) {
+			pedestrianOSM.clearStrides();
+			pedestrianOSM.clearFootSteps();
+		}
+	}
+
 	static UpdateSchemeOSM create(@NotNull final UpdateType updateType, @NotNull final Topography topography, final Random random) {
 		switch (updateType) {
 			case SEQUENTIAL: return new UpdateSchemeSequential(topography);
@@ -73,6 +84,13 @@ public interface UpdateSchemeOSM extends DynamicElementRemoveListener<Pedestrian
 	default void makeStep(@NotNull final Topography topography, @NotNull final PedestrianOSM pedestrian, final double stepTime) {
 		VPoint currentPosition = pedestrian.getPosition();
 		VPoint nextPosition = pedestrian.getNextPosition();
+
+		// start time
+		double timeOfNextStep = pedestrian.getTimeOfNextStep();
+
+		// end time
+		double entTimeOfStep = pedestrian.getTimeOfNextStep() + pedestrian.getDurationNextStep();
+
 		if (nextPosition.equals(currentPosition)) {
 			pedestrian.setTimeCredit(0);
 			pedestrian.setVelocity(new Vector2D(0, 0));
@@ -85,7 +103,11 @@ public interface UpdateSchemeOSM extends DynamicElementRemoveListener<Pedestrian
 			pedestrian.setVelocity(pedVelocity);
 		}
 
-		pedestrian.getStrides().add(Pair.of(currentPosition.distance(nextPosition), pedestrian.getTimeOfNextStep()));
+		/**
+		 * strides and foot steps have no influence on the simulation itself, i.e. they are saved to analyse trajectories
+		 */
+		pedestrian.getStrides().add(Pair.of(currentPosition.distance(nextPosition), timeOfNextStep));
+		pedestrian.getFootSteps().add(new FootStep(currentPosition, nextPosition, timeOfNextStep, entTimeOfStep));
 	}
 
 }

VadereSimulator/src/org/vadere/simulator/models/osm/updateScheme/UpdateSchemeParallel.java

@@ -32,6 +32,8 @@ public class UpdateSchemeParallel implements UpdateSchemeOSM {
 
 	@Override
 	public void update(double timeStepInSec, double currentTimeInSec) {
+		clearStrides(topography);
+
 		movedPedestrians.clear();
 		CallMethod[] callMethods = {CallMethod.SEEK, CallMethod.MOVE, CallMethod.CONFLICTS, CallMethod.STEPS};
 		List<Future<?>> futures;

VadereSimulator/src/org/vadere/simulator/models/osm/updateScheme/UpdateSchemeSequential.java

@@ -18,6 +18,7 @@ public class UpdateSchemeSequential implements UpdateSchemeOSM {
 
 	@Override
 	public void update(double timeStepInSec, double currentTimeInSec) {
+		clearStrides(topography);
 		update(topography.getElements(Pedestrian.class), timeStepInSec);
 	}
 

VadereSimulator/src/org/vadere/simulator/models/reynolds/PedestrianReynolds.java

@@ -4,6 +4,7 @@ import java.util.Random;
 
 import org.vadere.state.attributes.scenario.AttributesAgent;
 import org.vadere.state.scenario.Pedestrian;
+import org.vadere.state.simulation.FootStep;
 import org.vadere.util.geometry.shapes.Vector2D;
 import org.vadere.util.geometry.shapes.VPoint;
 
@@ -11,12 +12,14 @@ public class PedestrianReynolds extends Pedestrian {
 
 	private Vector2D lastMovement;
 	private double startTime;
+	private double lastSimTimeInSec;
 
 	public PedestrianReynolds(AttributesAgent attributesPedestrian, Random random) {
 		super(attributesPedestrian, random);
 
 		this.lastMovement = new Vector2D(0, 0);
 		this.startTime = -1;
+		this.lastSimTimeInSec = -1;
 	}
 
 	public VPoint getLastMovement() {
@@ -32,9 +35,16 @@ public class PedestrianReynolds extends Pedestrian {
 
 		if (startTime < 0) {
 			startTime = simTime;
+			lastSimTimeInSec = 0;
 		}
 
-		this.setPosition(this.getPosition().add(mov));
+		VPoint oldPosition = getPosition();
+		VPoint newPosition = oldPosition.add(mov);
+
+		setPosition(newPosition);
+		clearFootSteps();
+		getFootSteps().add(new FootStep(oldPosition, newPosition, lastSimTimeInSec, simTime));
+		lastSimTimeInSec = simTime;
 	}
 
 }

VadereSimulator/src/org/vadere/simulator/projects/dataprocessing/processor/PedestrianFootStepProcessor.java

+package org.vadere.simulator.projects.dataprocessing.processor;
+
+import org.vadere.annotation.factories.dataprocessors.DataProcessorClass;
+import org.vadere.simulator.control.SimulationState;
+import org.vadere.simulator.projects.dataprocessing.ProcessorManager;
+import org.vadere.simulator.projects.dataprocessing.datakey.PedestrianIdKey;
+import org.vadere.simulator.projects.dataprocessing.datakey.TimestepKey;
+import org.vadere.simulator.projects.dataprocessing.datakey.TimestepPedestrianIdKey;
+import org.vadere.state.scenario.Pedestrian;
+import org.vadere.state.simulation.FootStep;
+import org.vadere.state.util.StateJsonConverter;
+
+import java.util.LinkedList;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+/**
+ * During one time step a pedestrian my move multiple times which is saved by {@link Pedestrian#getFootSteps()}, i.e. the list of {@link FootStep}s
+ * will be adjusted after each update(simTimeInSec) call such that it contains the foot steps which started at the lastSimTimeInSec!
+ *
+ * This processor writes out all those {@link FootStep}s using the standard JSON-format, e.g. one foot steps:
+ * [{"startTime":26.588661014252686,"endTime":27.123123483931312,"start":{"x":29.4730189272315,"y":24.965262390895376},"end":{"x":29.59817287115996,"y":25.182035380547074}}]
+ *
+ * @author Benedikt Zoennchen
+ */
+@DataProcessorClass()
+public class PedestrianFootStepProcessor extends DataProcessor<TimestepPedestrianIdKey, LinkedList<FootStep>>{
+
+	private double lastSimTime;
+
+	public PedestrianFootStepProcessor() {
+		super("strides");
+		lastSimTime = 0.0;
+	}
+
+	Map<PedestrianIdKey, LinkedList<FootStep>> getPositions(TimestepKey timestepKey) {
+		return this.getData().entrySet().stream()
+				.filter(e -> e.getKey().getTimestep().equals(timestepKey.getTimestep()))
+				.collect(Collectors.toMap(e -> new PedestrianIdKey(e.getKey().getPedestrianId()), Map.Entry::getValue));
+	}
+
+	@Override
+	protected void doUpdate(final SimulationState state) {
+		Integer timeStep = state.getStep();
+		for (Pedestrian pedestrian : state.getTopography().getElements(Pedestrian.class)) {
+			LinkedList<FootStep> copy = pedestrian.getFootSteps()
+					.stream()
+					//.filter(footStep -> footStep.getEndTime() > lastSimTime)
+					//.filter(footStep -> footStep.getEndTime() <= state.getSimTimeInSec())
+					.collect(Collectors.toCollection(LinkedList::new));
+
+			putValue(new TimestepPedestrianIdKey(timeStep, pedestrian.getId()), copy);
+		}
+		lastSimTime = state.getSimTimeInSec();
+	}
+
+	@Override
+	public void init(final ProcessorManager manager) {
+		super.init(manager);
+	}
+
+	@Override
+	public String[] toStrings(TimestepPedestrianIdKey key) {
+		LinkedList<FootStep> strides = this.getValue(key);
+		StringBuilder builder = new StringBuilder();
+
+		if(strides == null) {
+			return new String[]{"{}"};
+		}
+		else {
+			builder.append("[");
+			String stridesString = StateJsonConverter.serialidzeObject(strides);
+			builder.append("]");
+
+			return new String[]{stridesString};
+		}
+	}
+}
\ No newline at end of file

VadereSimulator/src/org/vadere/simulator/projects/dataprocessing/processor/PedestrianLineCrossProcessor.java

+package org.vadere.simulator.projects.dataprocessing.processor;
+
+import org.vadere.simulator.control.SimulationState;
+import org.vadere.simulator.projects.dataprocessing.datakey.PedestrianIdKey;
+import org.vadere.state.attributes.processor.AttributesPedestrianLineCrossProcessor;
+
+public class PedestrianLineCrossProcessor extends DataProcessor<PedestrianIdKey, Double> {
+
+	public PedestrianLineCrossProcessor() {
+		super("crossTime");
+		setAttributes(new AttributesPedestrianLineCrossProcessor());
+	}
+
+	@Override
+	protected void doUpdate(SimulationState state) {
+
+	}
+}

VadereSimulator/src/org/vadere/simulator/projects/io/TrajectoryReader.java

 package org.vadere.simulator.projects.io;
 
+import com.fasterxml.jackson.core.type.TypeReference;
+
 import org.apache.commons.math3.util.Pair;
 import org.apache.log4j.LogManager;
 import org.apache.log4j.Logger;
@@ -9,7 +11,9 @@ import org.vadere.simulator.projects.dataprocessing.processor.PedestrianPosition
 import org.vadere.state.attributes.scenario.AttributesAgent;
 import org.vadere.state.scenario.Agent;
 import org.vadere.state.scenario.Pedestrian;
+import org.vadere.state.simulation.FootStep;
 import org.vadere.state.simulation.Step;
+import org.vadere.state.util.StateJsonConverter;
 import org.vadere.util.geometry.shapes.VPoint;
 import org.vadere.util.io.IOUtils;
 
@@ -52,6 +56,7 @@ public class TrajectoryReader {
 	private Set<String> targetIdKeys;
 	private Set<String> groupIdKeys;
 	private Set<String> groupSizeKeys;
+	private Set<String> stridesKeys;
 
 
 	private int pedIdIndex;
@@ -61,6 +66,7 @@ public class TrajectoryReader {
 	private int targetIdIndex;
 	private int groupIdIndex;
 	private int groupSizeIndex;
+	private int stridesIndex;
 
 	public TrajectoryReader(final Path trajectoryFilePath, final Scenario scenario) {
 		this(trajectoryFilePath, scenario.getAttributesPedestrian());
@@ -80,6 +86,7 @@ public class TrajectoryReader {
 		targetIdKeys = new HashSet<>();
 		groupIdKeys = new HashSet<>();
 		groupSizeKeys = new HashSet<>();
+		stridesKeys = new HashSet<>();
 
 		//should be set via Processor.getHeader
 		pedestrianIdKeys.add("id");
@@ -91,6 +98,8 @@ public class TrajectoryReader {
 		targetIdKeys.add("targetId");
 		groupIdKeys.add("groupId");
 		groupSizeKeys.add("groupSize");
+		stridesKeys.add("strides");
+		stridesKeys.add("footSteps");
 
 		pedIdIndex = -1;
 		stepIndex = -1;
@@ -99,6 +108,7 @@ public class TrajectoryReader {
 		targetIdIndex = -1;
 		groupIdIndex = -1;
 		groupSizeIndex = -1;
+		stridesIndex = -1;
 
 	}
 
@@ -128,6 +138,9 @@ public class TrajectoryReader {
 			else if (groupSizeKeys.contains(columns[index])){
 				groupSizeIndex = index;
 			}
+			else if(stridesKeys.contains(columns[index])) {
+				stridesIndex = index;
+			}
 		}
 		try {
 			if (pedIdIndex != -1 && xIndex != -1 && yIndex != -1 && stepIndex != -1) {
@@ -198,7 +211,7 @@ public class TrajectoryReader {
 
 		// pedestrian id
 		int pedestrianId = Integer.parseInt(rowTokens[pedIdIndex]);
-		Pedestrian ped = new Pedestrian(new AttributesAgent(this.attributesPedestrian, pedestrianId), new Random());
+		Pedestrian ped = new Pedestrian(new AttributesAgent(attributesPedestrian, pedestrianId), new Random());
 
 		// pedestrian position
 		VPoint pos = new VPoint(Double.parseDouble(rowTokens[xIndex]), Double.parseDouble(rowTokens[yIndex]));
@@ -211,11 +224,18 @@ public class TrajectoryReader {
 		ped.setTargets(targets);
 
 		if(groupIdIndex != -1) {
-			int groupId = groupIdIndex != -1 ? Integer.parseInt(rowTokens[groupIdIndex]) : -1;
+			int groupId = Integer.parseInt(rowTokens[groupIdIndex]);
 			int groupSize = groupSizeIndex != -1 ? Integer.parseInt(rowTokens[groupSizeIndex]) : -1;
 			ped.addGroupId(groupId, groupSize);
 		}
 
+		if(stridesIndex != -1) {
+			FootStep[] footSteps = StateJsonConverter.deserializeObjectFromJson(rowTokens[stridesIndex], FootStep[].class);
+			for(FootStep footStep : footSteps) {
+				ped.getFootSteps().add(footStep);
+			}
+		}
+
 		return Pair.create(new Step(step), ped);
 	}
 }

VadereState/src/org/vadere/state/attributes/processor/AttributesPedestrianLineCrossProcessor.java

+package org.vadere.state.attributes.processor;
+
+import org.vadere.util.geometry.shapes.VLine;
+
+public class AttributesPedestrianLineCrossProcessor extends AttributesProcessor {
+	private VLine line = new VLine(0, 0, 1, 0);
+}

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

 package org.vadere.state.scenario;
 
 import org.vadere.state.attributes.scenario.AttributesAgent;
+import org.vadere.state.simulation.FootStep;
 import org.vadere.state.types.ScenarioElementType;
 import org.vadere.util.geometry.shapes.VShape;
 
@@ -21,6 +22,15 @@ public class Pedestrian extends Agent {
 
 	private LinkedList<Integer> groupIds; // TODO should actually be an attribute or a member of a subclass
 
+	/**
+	 * Footsteps is a list of foot steps a pedestrian made during the duration of one time step.
+	 * For all non event driven models this is exactly one foot step. For the event driven update
+	 * one pedestrian can move multiple times during one time step. To save memory the list of foot steps
+	 * will be cleared after each completion of a time step. The output processor <tt>PedestrianStrideProcessor</tt>
+	 * can write out those foot steps.
+	 */
+	private LinkedList<FootStep> footSteps;
+
 	/** Used only for JSON serialization? */
 	// TODO used at all? Car does NOT have this field. remove if unused!
 	private ScenarioElementType type = ScenarioElementType.PEDESTRIAN;
@@ -47,6 +57,7 @@ public class Pedestrian extends Agent {
 		isLikelyInjured = false;
 		groupIds = new LinkedList<>();
 		groupSizes = new LinkedList<>();
+		footSteps = new LinkedList<>();
 	}
 
 	/**
@@ -67,6 +78,17 @@ public class Pedestrian extends Agent {
 			groupIds = new LinkedList<>();
 			groupSizes = new LinkedList<>();
 		}
+
+		footSteps = new LinkedList<>();
+		footSteps.addAll(other.footSteps);
+	}
+
+	public void clearFootSteps() {
+		footSteps.clear();
+	}
+
+	public LinkedList<FootStep> getFootSteps() {
+		return footSteps;
 	}
 
 	public void addGroupId(int groupId, int size){

VadereState/src/org/vadere/state/simulation/FootStep.java

+package org.vadere.state.simulation;
+
+import org.jetbrains.annotations.NotNull;
+import org.vadere.util.geometry.shapes.VPoint;
+
+/**
+ * A foot step is a simple java bean which represents one pedestrian foot step which is defined by
+ * <ol>
+ *     <li>start time (simulation time in seconds)</li>
+ *     <li>end time (simulation time in seconds)</li>
+ *     <li>start point</li>
+ *     <li>end point</li>
+ * </ol>
+ *
+ * @author Benedikt Zoennchen
+ */
+public final class FootStep {
+
+	/*
+	 * These are not final because of Jackson.
+	 */
+	private double startTime;
+	private double endTime;
+	private VPoint start;
+	private VPoint end;
+
+	/**
+	 * Constructor for Jackson.
+	 */
+	public FootStep() {}
+
+	/**
+	 * Default constructor.
+	 *
+	 * @param start     start point of the foot step
+	 * @param end       end point of the foot step
+	 * @param startTime start time of the foot step
+	 * @param endTime   end time of the foot step
+	 */
+	public FootStep(@NotNull final VPoint start, @NotNull final VPoint end, final double startTime, final double endTime) {
+		this.start = start;
+		this.end = end;
+		this.startTime = startTime;
+		this.endTime = endTime;
+	}
+
+	public double getEndTime() {
+		return endTime;
+	}
+
+	public double getStartTime() {
+		return startTime;
+	}
+
+	public VPoint getEnd() {
+		return end;
+	}
+
+	public VPoint getStart() {
+		return start;
+	}
+}

VadereState/src/org/vadere/state/simulation/Trajectory.java

@@ -7,9 +7,11 @@ import java.util.Map;
 import java.util.Optional;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
+import java.util.stream.StreamSupport;
 
 import org.jetbrains.annotations.NotNull;
 import org.vadere.state.scenario.Agent;
+import org.vadere.state.scenario.Pedestrian;
 import org.vadere.util.geometry.shapes.VPoint;
 
 /**
@@ -181,7 +183,7 @@ public class Trajectory {
 	 * Return a {@link java.util.stream.Stream<>} stream of
 	 * {@link org.vadere.util.geometry.shapes.VPoint} pedestrian positions
 	 * from the first step (1) to the (step.getStepNumber()) in reverse order.
-	 * 
+	 *
 	 * @param step the step of the last pedestrian position
 	 * @return a stream of pedestrian positions to from 1 to step.getStepNumber() in reverse order
 	 */
@@ -189,8 +191,21 @@ public class Trajectory {
 		return Stream.iterate(step, s -> new Step(s.getStepNumber() - 1))
 				.limit(step.getStepNumber())
 				.map(s -> getAgent(s))
-				.filter(optPed -> optPed.isPresent())
-				.map(optPed -> optPed.get().getPosition());
+				.filter(optAgent -> optAgent.isPresent())
+				.map(optAgent -> optAgent.get())
+				.flatMap(agent -> toPointStream(agent));
+	}
+
+	private Stream<VPoint> toPointStream(@NotNull final Agent agent) {
+		// use the foot step information if available
+		if(agent instanceof Pedestrian) {
+			Pedestrian pedestrian = (Pedestrian)agent;
+			if(!pedestrian.getFootSteps().isEmpty()) {
+				Iterable<FootStep> iterable = () -> pedestrian.getFootSteps().descendingIterator();
+				return StreamSupport.stream(iterable.spliterator(), false).map(footStep -> footStep.getEnd());
+			}
+		}
+		return Stream.of(agent.getPosition());
 	}
 
 	public Optional<Step> getStartStep() {

VadereState/src/org/vadere/state/util/StateJsonConverter.java

@@ -60,7 +60,9 @@ public abstract class StateJsonConverter {
 	private static ObjectMapper mapper = new JacksonObjectMapper();
 
 	/** Connection to jackson library. */
-	private static ObjectWriter writer = mapper.writerWithDefaultPrettyPrinter();
+	private static ObjectWriter prettyWriter = mapper.writerWithDefaultPrettyPrinter();
+
+	private static ObjectWriter writer = mapper.writer();
 
 	public static ObjectMapper getMapper() {
 		return mapper;
@@ -78,6 +80,18 @@ public abstract class StateJsonConverter {
 		}
 	}
 
+	public static <T> T deserializeObjectFromJson(String json, final TypeReference<T> type) {
+		T data = null;
+
+		try {
+			data = mapper.readValue(json, type);
+		} catch (Exception e) {