In "ThreatCognitionModel.java", implemented Gerta's wish and added...

In "ThreatCognitionModel.java", implemented Gerta's wish and added "pedestrianIsBlockedByObstacle()"

Scenarios/ModelTests/TestPsychology/CognitionAndBehavior/scenarios/17-Threat-ImitatingBehavior-SelfCatThreatModel.scenario

@@ -129,7 +129,37 @@
         "bounded" : true,
         "referenceCoordinateSystem" : null
       },
-      "obstacles" : [ ],
+      "obstacles" : [ {
+        "shape" : {
+          "type" : "POLYGON",
+          "points" : [ {
+            "x" : 23.0,
+            "y" : 3.75
+          }, {
+            "x" : 24.5,
+            "y" : 3.75
+          }, {
+            "x" : 24.5,
+            "y" : 5.5
+          }, {
+            "x" : 23.0,
+            "y" : 5.5
+          }, {
+            "x" : 23.0,
+            "y" : 6.5
+          }, {
+            "x" : 25.5,
+            "y" : 6.5
+          }, {
+            "x" : 25.5,
+            "y" : 3.0
+          }, {
+            "x" : 23.0,
+            "y" : 3.0
+          } ]
+        },
+        "id" : 7
+      } ],
       "measurementAreas" : [ ],
       "stairs" : [ ],
       "targets" : [ {

VadereSimulator/src/org/vadere/simulator/control/psychology/cognition/ThreatCognitionModel.java

@@ -7,6 +7,7 @@ import org.vadere.state.psychology.perception.types.Stimulus;
 import org.vadere.state.psychology.perception.types.Threat;
 import org.vadere.state.scenario.Pedestrian;
 import org.vadere.state.scenario.Topography;
+import org.vadere.state.simulation.FootstepHistory;
 import org.vadere.util.geometry.shapes.VPoint;
 
 import java.util.Collection;
@@ -94,14 +95,39 @@ public class ThreatCognitionModel implements ICognitionModel {
         double distanceToThreat = threatOrigin.distance(pedestrian.getPosition());
 
         boolean pedestrianIsInsideThreatArea = (distanceToThreat <= latestThreat.getRadius());
+        boolean pedestrianIsBlockedByObstacle = pedestrianIsBlockedByObstacle(pedestrian, topography);
 
-        if (pedestrianIsInsideThreatArea) {
+        // Gerta suggests to apply SelfCategory.OUTSIDE_THREAT_AREA to agents if they are blocked by a wall.
+        if (pedestrianIsInsideThreatArea && pedestrianIsBlockedByObstacle == false) {
             pedestrian.setSelfCategory(SelfCategory.INSIDE_THREAT_AREA);
         } else {
             pedestrian.setSelfCategory(SelfCategory.OUTSIDE_THREAT_AREA);
         }
     }
 
+    // TODO Write unit tests!
+    private boolean pedestrianIsBlockedByObstacle(Pedestrian pedestrian, Topography topography) {
+        boolean isBlocked = false;
+
+        int requiredFootSteps = 2;
+        double requiredSpeedToBeBlocked = 0.05;
+        double requiredDistanceToObstacle = 1.0;
+
+        FootstepHistory footstepHistory = pedestrian.getFootstepHistory();
+
+        if (footstepHistory.size() >= requiredFootSteps) {
+            if (footstepHistory.getAverageSpeedInMeterPerSecond() <= requiredSpeedToBeBlocked) {
+                // Watch out: This is probably a very expensive call but Gerta suggests to include it to get a realistic behavior!
+                if (topography.distanceToObstacle(pedestrian.getPosition()) <= requiredDistanceToObstacle) {
+                    isBlocked = true;
+                }
+            }
+        }
+
+        return  isBlocked;
+    }
+
+
     /**
      * If a threatened ingroup pedestrian is nearby, use the same reaction as if
      * the current "pedestrian" would have perceived the same threat. I.e, imitate