adjust animation player fps

Author: ekatrukha

src/main/java/bigtrace/animation/AnimationPlayer.java

@@ -21,7 +21,7 @@ public AnimationPlayer(final BigTrace<?> bt_, AnimationPanel aPanel_)
 	{
 		this.bt = bt_;
 		this.aPanel = aPanel_;
-		timer = new Timer(1000 / 60, e -> tick());
+		timer = new Timer(1000 / 30, e -> tick());
 	}
 
     public void play() 
@@ -45,9 +45,9 @@ public void play()
 
     public void stop() 
     {
+        timer.stop();
         playing = false;
         aPanel.bUpdateSlider = bSliderUpdateState;
-        timer.stop();
         aPanel.butPlayStop.setIcon( aPanel.tabIconPlay );
 		aPanel.butPlayStop.setToolTipText( "Play Preview" );
 		bt.bInputLock = false;