I'm trying to write a program with an equalizer, a frequency analyzer and a sound level meter. The model part seems to work very well but I'm experimenting some bugs with the IHM.
My last bug is with the level meter. After a while (from few milliseconds to few seconds), it freezes and don't update anymore. So, here is a (simplified) version of it. I added the runnable part to test and reproduce the bug. Of course, this bug appears sooner when I add other graphical components which also need to refresh very frequently. For example, the frequency analyze is represented by a line-chart with something like 1000 points.
public class LevelMeter2 extends Parent implements Runnable {
private IntegerProperty levelMeterHeight = new SimpleIntegerProperty();
private Rectangle led;
private IntegerProperty height = new SimpleIntegerProperty();
private IntegerProperty width = new SimpleIntegerProperty();
private DoubleProperty linearValue = new SimpleDoubleProperty();
private Color backgroundColor=Color.BLACK;
private double minLinearValue, maxLinearValue;
public LevelMeter2 (int height2, int width2) {
this.height.set(height2);
this.levelMeterHeight.bind(height.multiply(0.9));
this.width.set(width2);
linearValue.set(1.0);
minLinearValue = Math.pow(10, -60.0/100);
maxLinearValue = Math.pow(10, 3.0/100)-minLinearValue;
Rectangle levelMeterShape = new Rectangle();
levelMeterShape.widthProperty().bind(width);
levelMeterShape.heightProperty().bind(height);
levelMeterShape.setStroke(backgroundColor);
this.getChildren().add(levelMeterShape);
led = new Rectangle();
led.widthProperty().bind(width.multiply(0.8));
led.translateXProperty().bind(width.multiply(0.1));
led.heightProperty().bind(levelMeterHeight.multiply(linearValue));
led.setFill(Color.AQUA);
Rotate rotate = new Rotate();
rotate.pivotXProperty().bind(width.multiply(0.8).divide(2));
rotate.pivotYProperty().bind(height.divide(2));
rotate.setAngle(180);
led.getTransforms().add(rotate);
this.getChildren().add(led);
}
public double convertdBToLinearValue (double dB) {
return ((double)Math.round(100 * ((Math.pow(10, dB/100)-minLinearValue)/maxLinearValue)) ) /100 ;
//return (Math.pow(10, dB/100)-minLinearValue)/maxLinearValue;
}
public double convertLinearValueTodB (double linearValue) {
return 100*Math.log10(linearValue*maxLinearValue+minLinearValue);
}
public void setValue (double dB) {
if (dB>3) {
dB=3;
}
linearValue.setValue(convertdBToLinearValue(dB));
}
@Override
public void run() {
int i = 0;
double value=-20;
while (i<1000) {
setValue(value);
value = (Math.random()-0.5)*10+value;
if (value>3) {
value=3;
}
if (value<-60) {
value=-60;
}
i++;
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println("END OF WHILE");
}
}
And a "Main" to test it :
public class MainGraph extends Application {
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception {
HBox pane = new HBox();
LevelMeter2 levelMeter = new LevelMeter2(300,30);
Thread t = new Thread(levelMeter);
pane.getChildren().add(levelMeter);
t.start();
Scene scene = new Scene(pane, 300, 300);
primaryStage.setScene(scene);
primaryStage.setTitle("Test IHM");
primaryStage.setOnCloseRequest( event -> {
System.out.println("FIN");
System.exit(0);
});
primaryStage.show();
}
}
What's wrong with my code ? How can I write a more robust code that will allow me high refresh rates of my IHM ? Or how can I prevent from freezing ?
Thank you for you help.
