Optimize TimeRecordView

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

@@ -4,6 +4,7 @@ import androidx.appcompat.app.AppCompatActivity;
 import androidx.constraintlayout.widget.ConstraintLayout;
 
 import android.os.Bundle;
+import android.os.Looper;
 import android.view.View;
 import android.widget.Button;
 import android.widget.LinearLayout;
@@ -24,7 +25,7 @@ public class MainActivity extends AppCompatActivity implements Observer {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-        this.track = new Track(40, 200);
+        this.track = new Track(25, 100);
         this.track.addObserver(this);
         this.viewStack = (LinearLayout) findViewById(R.id.trackViewStack);
 
@@ -35,17 +36,20 @@ public class MainActivity extends AppCompatActivity implements Observer {
         final Track trackRef = this.track;
         //final TimeRecordView viewRef = this.trackView;
         final LinearLayout viewStackRef = this.viewStack;
-        final List<VehicleTimeRecord> newRecords = (List<VehicleTimeRecord>) o;
+        //final List<VehicleTimeRecord> newRecords = (List<VehicleTimeRecord>) o;
         final MainActivity mainActivity = this;
         runOnUiThread(new Runnable() {
             @Override
             public void run() {
-                TimeRecordView newTrView = new TimeRecordView(mainActivity, newRecords, trackRef.getTrackLength());
-                viewStackRef.addView(newTrView, 0);
-                int childCount = viewStackRef.getChildCount();
-                if (childCount > 30) {
-                    viewStackRef.removeViewAt(childCount-1);
-                }
+                TimeRecordView newTrView = new TimeRecordView(mainActivity, trackRef);
+                if (viewStackRef.getChildCount() > 0)
+                    viewStackRef.removeViewAt(0);
+                viewStackRef.addView(newTrView);
+                //viewStackRef.addView(newTrView, 0);
+                //int childCount = viewStackRef.getChildCount();
+                //if (childCount > 30) {
+                //    viewStackRef.removeViewAt(childCount-1);
+                //}
             }
         });
 

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

@@ -11,18 +11,17 @@ import java.util.List;
 
 public class TimeRecordView extends View {
     protected Paint paint;
-    protected List<VehicleTimeRecord> records;
+    protected Track track;
     protected int pixelPerVehicle;
-    protected float trackLength;
 
-    public TimeRecordView(Context context, List<VehicleTimeRecord> records, float trackLength) {
+    public TimeRecordView(Context context, Track track) {
         super(context);
-        this.records = records;
-        this.trackLength = trackLength;
+        this.track = track;
         this.paint = new Paint();
         paint.setColor(Color.BLACK);
         paint.setStyle(Paint.Style.FILL_AND_STROKE);
         this.setBackgroundColor(Color.BLACK);
+        this.pixelPerVehicle = (int) (this.getWidth() / this.track.getTrackLength());
     }
 
     protected int getColor(float curVelocity, float maxVelocity) {
@@ -43,25 +42,32 @@ public class TimeRecordView extends View {
 
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        super.onMeasure(widthMeasureSpec, 10);
-        setMeasuredDimension(widthMeasureSpec, 10);
+        super.onMeasure(widthMeasureSpec, 10*50);
+        setMeasuredDimension(widthMeasureSpec, 10*50);
+        this.pixelPerVehicle = (int) (this.getWidth() / this.track.getTrackLength());
     }
 
     @Override
     protected void onSizeChanged(int w, int h, int oldw, int oldh) {
         super.onSizeChanged(w, h, oldw, oldh);
+        this.pixelPerVehicle = (int) (this.getWidth() / this.track.getTrackLength());
     }
 
     @Override
     protected void onDraw(Canvas canvas) {
-        this.pixelPerVehicle = (int) (this.getWidth() / this.trackLength);
-        int i = 0;
-        for (VehicleTimeRecord r : this.records) {
-            int left = (int) (this.pixelPerVehicle * r.getPosition());
-            this.paint.setColor(getColor(r.getVelocity(), r.getMaxVelocity()));
-            canvas.drawRect(left, 0, left + this.pixelPerVehicle - 1,
-                    10, this.paint);
-            i++;
+        int y = 0;
+        List<List<VehicleTimeRecord>> stepList = this.track.getVtrList();
+        for (int curStepIdx = stepList.size()-1; curStepIdx >= stepList.size()-1-50 && curStepIdx >= 0; curStepIdx--) {
+            List<VehicleTimeRecord> step = stepList.get(curStepIdx);
+            int i = 0;
+            for (VehicleTimeRecord r : step) {
+                int left = (int) (this.pixelPerVehicle * r.getPosition());
+                this.paint.setColor(getColor(r.getVelocity(), r.getMaxVelocity()));
+                canvas.drawRect(left, y, left + this.pixelPerVehicle - 1,
+                        y+10, this.paint);
+                i++;
+            }
+            y += 10;
         }
     }
 }

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

@@ -71,8 +71,13 @@ public class Track extends Observable {
         }
         update_avg();
         this.setChanged();
-        this.notifyObservers(records);
+        this.notifyObservers();
         this.clearChanged();
+        try  {
+            Thread.sleep(125);
+        } catch (InterruptedException ex) {
+
+        }
     }
 
     public float avg_step(int step){