some comments and minor code changes

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

@@ -4,7 +4,6 @@ import org.vadere.simulator.projects.dataprocessing.ProcessorManager;
 import org.vadere.simulator.projects.dataprocessing.datakey.TimestepKey;
 import org.vadere.state.attributes.processor.AttributesAreaProcessor;
 import org.vadere.state.scenario.MeasurementArea;
-import org.vadere.util.geometry.shapes.VRectangle;
 
 /**
  * @author Mario Teixeira Parente

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

@@ -5,7 +5,6 @@ import org.vadere.simulator.projects.dataprocessing.datakey.TimestepKey;
 import org.vadere.state.attributes.processor.AttributesAreaDensityCountingProcessor;
 import org.vadere.state.attributes.processor.AttributesProcessor;
 import org.vadere.state.scenario.Pedestrian;
-
 import java.util.Collection;
 
 import org.vadere.annotation.factories.dataprocessors.DataProcessorClass;
@@ -13,6 +12,11 @@ import org.vadere.annotation.factories.dataprocessors.DataProcessorClass;
 /**
  * @author Daniel Lehmberg
  * Processor counts number of pedestrians in a measurement area of any shape.
+ *
+ * To avoid unneccessary complicated structures this class does *not* extend from @AreaDensityProcessor (which requires
+ * an intern class or a separate class implementing the density algorithm). However, AreaDensityProcessor is a better
+ * description of what the processor does.
+ * See e.g. AreaDensityVoronoiProcessor / AreaDensityVoronoiAlgorithm
  */
 @DataProcessorClass(label = "AreaDensityCountingProcessor")
 public class AreaDensityCountingProcessor extends AreaDataProcessor<Integer>  {
@@ -24,18 +28,23 @@ public class AreaDensityCountingProcessor extends AreaDataProcessor<Integer> {
 
     @Override
     protected void doUpdate(final SimulationState state) {
-        int step = state.getStep();
 
+        // Compute density by counting the pedestrians
+        // With the area of the shape the density can be normalized to [ped/m^2] "pedCount/area"
         int pedCount = 0;
+
+        // Here could also be another processor. However, because a processor uses more memory, all pedestrians
+        // are collected from the state directly.
         Collection<Pedestrian> pedestrians = state.getTopography().getPedestrianDynamicElements().getElements();
 
+        // Alternatively, this could be implemented with "Streams"
         for (Pedestrian p : pedestrians) {
             if(this.getMeasurementArea().getShape().contains(p.getPosition())){
                 pedCount++;
             }
         }
 
-        this.putValue(new TimestepKey(step), pedCount);
+        this.putValue(new TimestepKey(state.getStep()), pedCount);
     }
 
     @Override