I have an imageView in the view. It moves even if the iphone is still for some time. Why is it so ? Also the image does not respond quickly to the movement of the iphone.

Here is my code written for this:

I have also set the updateInterval and delegate for the accelerometer.

#define kVelocityMultiplier 1000;



-(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration
{
    if(currentPoint.x < 0)
    {
    	currentPoint.x=0;
    	ballXVelocity=0;
    }

    if(currentPoint.x > 480-sliderWidth)
    {
    	currentPoint.x=480-sliderWidth;
    	ballXVelocity=0;
    }
    static NSDate *lastDrawTime;
    if(currentPoint.x<=480-sliderWidth&&currentPoint.x>=0)
    {

    	if(lastDrawTime!=nil)
    	{
    		NSTimeInterval secondsSinceLastDraw=-([lastDrawTime timeIntervalSinceNow]);
    		ballXVelocity = ballXVelocity + -acceleration.y*secondsSinceLastDraw;

    		CGFloat xAcceleration=secondsSinceLastDraw * ballXVelocity * kVelocityMultiplier;

    		currentPoint = CGPointMake(currentPoint.x + xAcceleration, 266);
    	}
    	slider.frame=CGRectMake(currentPoint.x, currentPoint.y, sliderWidth, 10);
    }
    [lastDrawTime release];
    lastDrawTime=[[NSDate alloc]init];
}

Can anyone help me out please ?