I want to rotate my stick based on the movement of the touch on the screen. From my calculation I did not able to find correct angle in degree. So please provide guidance, my code snippet for that are below.
if (pSceneTouchEvent.isActionMove()) {
pValueX = pSceneTouchEvent.getX();
pValueY = CAMERA_HEIGHT - pSceneTouchEvent.getY();
rotationAngle = (float) Math.atan2(pValueX, pValueY);
stick.setRotation((float) MathUtils.radToDeg(rotationAngle));
}
I'm assuming you're talking about a joystick; one which, when active, always points toward your finger.
It looks like your X and Y values are positions relative to one corner of the screen - so you're just measuring the angle from one corner of the screen to your finger. Of course it would never work! Well, unless your stick is on the corner of the screen.
What you need to do find the angle of the player's finger relative to your joystick's position.
In Vector mathematics: the vector from B to A = A - B
So in your case: the vector from Stick to Touch = Touch - Stick
// where joyX and joyY are the position of the joystick on the screen
touchX = pSceneTouchEvent.getX();
touchY = CAMERA_HEIGHT - pSceneTouchEvent.getY();
directionX = touchX - joyX
directionY = touchY - joyY
rotationAngle = (float) Math.atan2(directionY, directionX);
The answer for the above question is as below
if (pSceneTouchEvent.isActionMove()) {
pValueX = pSceneTouchEvent.getX();
pValueY = CAMERA_HEIGHT - pSceneTouchEvent.getY();
directionX = pValueX - stick.getX();
directionY = (CAMERA_HEIGHT - pValueY) - stick.getY();
rotationAngle = (float) Math.atan2(directionY, directionX);
stick.setRotation(MathUtils.radToDeg(rotationAngle));
}