Ball Animation in Landscape mode using uiaccelerometer

[venkateshf1]

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I'm animating a ball on the screen in portrait mode using uiaccelerometer.Its working fine, now I want the same to work in landscape mode.When i tried to use the same part of code(for portrait) in the landscape mode it gives me a weird result, seems to be completely wrong. I am breaking my head in to this. Any help will be appreciated.My code below for poratrit view.

(void)accelerometerUIAccelerometer *)accelerometer didAccelerateUIAcceleration *)acceleration {
// apply acceleration to velocity

NSTimeInterval elapsedTime = acceleration.timestamp - lastAccelTimestamp;
ballVelocityX = ballVelocityX + (acceleration.x * MAX_ACCEL_PER_SEC * elapsedTime);
ballVelocityY = ballVelocityY - (acceleration.y * MAX_ACCEL_PER_SEC * elapsedTime);

if (lastAccelTimestamp > 0) {
// recalc ball position
ballX += (ballVelocityX * elapsedTime); // ballX is CGFloat
ballY += (ballVelocityY * elapsedTime); // ballY is CGFloat
// update view
[ballView setCenter:CGPointMake(ballX, ballY)];
} lastAccelTimestamp = acceleration.timestamp;

}