Partially implement timesteps

app/src/main/java/de/hems/trafficsim/MainActivity.java

@@ -21,7 +21,7 @@ public class MainActivity extends AppCompatActivity implements Observer {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-        this.track = new Track(25, 100);
+        this.track = new Track(1, 100);
         this.trackView = new TrackView(this, this.track);
         this.track.addObserver(this);
         ConstraintLayout layout = (ConstraintLayout) findViewById(R.id.constr_layout);
@@ -54,7 +54,7 @@ public class MainActivity extends AppCompatActivity implements Observer {
 
     public void onStepButtonClick(View view) {
         //for (int j = 0; j < 3000; j++) {
-            this.track.timeElapse(50);
+            this.track.timeElapse(1f);
         //}
     }
 

app/src/main/java/de/hems/trafficsim/Track.java

@@ -27,7 +27,7 @@ public class Track extends Observable {
     protected List<Vehicle> createVehiclesList(int numberVehicles){
         List<Vehicle> result = new ArrayList<>();
         for(int i=0;i<numberVehicles;i++){
-            Vehicle vehicle = new Vehicle(i, i, 5, 0.2f, this.trackLength);
+            Vehicle vehicle = new Vehicle(i, i, 5, 0.1f, this.trackLength);
             result.add(vehicle);
         }
 
@@ -46,12 +46,12 @@ public class Track extends Observable {
             if(distanceForerunner < 0.0){
                 distanceForerunner += this.trackLength;
             }
-            v.updateVelocity(distanceForerunner);
+            v.updateVelocity(distanceForerunner, timeStep);
         }
         List <VehicleTimeRecord> records = new ArrayList<>(vehicles.size());
         this.vtr_list.add(records);
         for(Vehicle v: vehicles){
-            v.timeElapse(50);
+            v.timeElapse(timeStep);
             VehicleTimeRecord vtr = new VehicleTimeRecord(v.id, v.position, v.curVelocity, timeStep);
             records.add(vtr);
         }
@@ -60,4 +60,7 @@ public class Track extends Observable {
         this.notifyObservers(this);
         this.clearChanged();
     }
+
+    // Durchschnittsgeschwindigkeit, Anteil der Fahrzeuge unter einem bestimmten Threshold
+    //
 }

app/src/main/java/de/hems/trafficsim/Vehicle.java

@@ -33,25 +33,27 @@ public class Vehicle {
         return maxVelocity;
     }
 
-    public void updateVelocity(float distanceForerunner) {
+    public void updateVelocity(float distanceForerunner, float timeStep) {
         Random random = new Random();
 
         float r = random.nextFloat();
 
         if (curVelocity < maxVelocity) {
-            curVelocity = curVelocity + 1;
+            curVelocity = curVelocity + 1*timeStep;
         }
         if (r < brakeProp && curVelocity > 0) {
             curVelocity = getCurVelocity() - 1;
+            if (curVelocity < 0)
+                curVelocity = 0;
         }
-        if (curVelocity > distanceForerunner) {
-            curVelocity = distanceForerunner;
+        float distance = this.curVelocity * timeStep;
+        if (distance > distanceForerunner) {
+            curVelocity = distanceForerunner/timeStep;
         }
-
     }
 
     public void timeElapse(float timeStep) {
-        position = (position + curVelocity) % this.trackLength;
+        position = (position + curVelocity*timeStep) % this.trackLength;
     }
 
 }

app/src/main/java/de/hems/trafficsim/Worker.java

@@ -1,5 +1,7 @@
 package de.hems.trafficsim;
 
+import java.util.Date;
+
 public class Worker extends Thread {
     protected Track track;
     protected boolean stop;
@@ -15,8 +17,11 @@ public class Worker extends Thread {
 
     @Override
     public void run() {
+        long lastStartTime = System.currentTimeMillis();
         while (!stop) {
-            this.track.timeElapse(50);
+            long startTime = System.currentTimeMillis();
+            this.track.timeElapse((startTime - lastStartTime));
+            lastStartTime = startTime;
         }
     }
 }