Method handle

core/src/processing/javafx/PSurfaceFX.java:86–112

(ActionEvent event)

    KeyFrame keyFrame = new KeyFrame(Duration.millis(1000),
                                     new EventHandler<ActionEvent>() {
      public void handle(ActionEvent event) {
        long startNanoTime = System.nanoTime();
        try {
          sketch.handleDraw();
        } catch (Throwable e) {
          // Let exception handler thread crash with our exception
          drawExceptionQueue.offer(e);
          // Stop animating right now so nothing runs afterwards
          // and crash frame can be for example traced by println()
          animation.stop();
          return;
        }
        long drawNanos = System.nanoTime() - startNanoTime;

        if (sketch.exitCalled()) {
          // using Platform.runLater() didn't work
//          Platform.runLater(new Runnable() {
//            public void run() {
          // instead of System.exit(), safely shut down JavaFX this way
          Platform.exit();
//            }
//          });
        }
        if (sketch.frameCount > 5) {
          animation.setRate(-PApplet.min(1e9f / drawNanos, frameRate));
        }
      }
    });
    animation = new Timeline(keyFrame);
    animation.setCycleCount(Animation.INDEFINITE);