JavaFX First Person Centering Mouse

Question

I am trying to learn about programming 3D in javafx. My goal is to lock the cursor in the center or move it to the center for a first person view.

I made a mouse moved event and I move the cursor to the middle of the screen, then change the camera depending on where I moved the mouse to. The problem is that whenever it moves the cursor back to the center the event fires again reversing the change in camera angle. Anyone know a way to make it so when it moves the cursor back to the center it doesn't affect the camera angle?

 scene.setOnMouseMoved(e -> {
 int screenWidth = (int) Screen.getPrimary().getBounds().getWidth();
 int screenHeight = (int) Screen.getPrimary().getBounds().getHeight();
 moveCursor(screenWidth / 2, screenHeight / 2);
 double dx = mouseX - e.getSceneX();
 double dy = mouseY - e.getSceneY();
 mouseX = e.getSceneX();
 mouseY = e.getSceneY();
 camAngleX += dx / 10;
 camAngleY -= dy / 10;
 });

Here is after adding the Boolean check... I defined "ignoreMouseMove" somewhere else.

 scene.setOnMouseMoved(e -> {
 if (ignoreMouseMove) {
 ignoreMouseMove = false;
 } else {
 double cx = primaryStage.getX() + scene.getX() + sceneX / 2;
 double cy = primaryStage.getY() + scene.getY() + sceneY / 2;
 double dx = mouseX - e.getSceneX();
 double dy = mouseY - e.getSceneY();
 mouseX = e.getSceneX();
 mouseY = e.getSceneY();
 camAngleX += dx / 10;
 camAngleY -= dy / 10;
 ignoreMouseMove = true;
 moveMouse(cx, cy);
 }
 }

Answer 1

You just need a boolean check like:

boolean ignoreMouseMove = false;
scene.setOnMouseMoved(e -> {
 if(ignoreMouseMove) {
 ignoreMouseMove = false;
 } else {
 int screenWidth = (int) Screen.getPrimary().getBounds().getWidth();
 int screenHeight = (int) Screen.getPrimary().getBounds().getHeight();
 ignoreMouseMove = true;
 moveCursor(screenWidth / 2, screenHeight / 2);
 double dx = mouseX - e.getSceneX();
 double dy = mouseY - e.getSceneY();
 mouseX = e.getSceneX();
 mouseY = e.getSceneY();
 camAngleX += dx / 10;
 camAngleY -= dy / 10;
 }
});

If it helps you here is an implementation I did myself a few weeks back that works:

Robot mouseMover = new Robot(); //defined somewhere else
scene.setOnMouseMoved(event -> {
 if(ignoreMouseEvent) {
 ignoreMouseEvent = false;
 return;
 }
 mouseDeltaX += Math.round(event.getScreenX() - (stage.getX() + (stage.getWidth() / 2.0))) / 5.0;
 mouseDeltaY += -Math.round((event.getScreenY() - (stage.getY() + (stage.getHeight() / 2.0)))) / 5.0;
 ignoreMouseEvent = true;
 mouseMover.mouseMove((int) (stage.getX() + (stage.getWidth() / 2.0)), (int) (stage.getY() + (stage.getHeight() / 2.0)));
});

• Ale: I added the boolean check like you said and it still didn't work
• Jhonny007: So you are still getting the behavior of mouseEvents calling themselves recursively an infinite amount of time?
• Jhonny007: I updated my answer with an example that I implemented myself.