public void SetupGestureRecognizer()
{
_midPoint = new CGPoint(_handleImage.Frame.X + _handleImage.Frame.Size.Width / 2, _handleImage.Frame.Y + _handleImage.Frame.Size.Height / 2);
_outRadius = _handleImage.Frame.Size.Width / 3 + 12.0f;
_innerRadius = _outRadius / 2;
if (_showTouchPath)
{
var bigCircle = new UICircleView(Bounds, _midPoint, _outRadius);
var smallCircle = new UICircleView(Bounds, _midPoint, _innerRadius);
Add(bigCircle);
Add(smallCircle);
}
_imageAngle = _currentValue.ToCurrentAngle(_minValue, _maxValue);
_handleImage.Transform = CGAffineTransform.MakeRotation(_imageAngle * ((float)Math.PI) / 180);
_gestureRecognizer = new RotationGestureRecognizer(_midPoint, _innerRadius, _outRadius);
_gestureRecognizer.RotationStarted += ((nfloat cumulatedAngle) =>
{
_imageAngle += cumulatedAngle;
if (_imageAngle < -145)
{
_imageAngle = -145;
}
else if (_imageAngle > 145)
{
_imageAngle = 145;
}
InvokeOnMainThread(() =>
{
// Rotate image and update text field
_handleImage.Transform = CGAffineTransform.MakeRotation(_imageAngle * ((float)Math.PI) / 180);
_currentValue = _imageAngle.ToCurrentValue(_minValue, _maxValue);
_valueLabel.Text = Convert.ToInt32(_currentValue).ToString();
if (RotationEnded != null)
{
RotationEnded(_currentValue);
}
});
});
_gestureRecognizer.Rotating += (nfloat angle) =>
{
// Calculate rotation angle
_imageAngle += angle;
/*
* // Use this setting if you want to go round and round endlessly
* if (imageAngle > 360)
* imageAngle -= 360;
* else if (imageAngle < -360)
* imageAngle += 360;
*/
Console.WriteLine("_imageAngle = {0}", _imageAngle);
if (_imageAngle < -145)
{
_imageAngle = -145;
}
else if (_imageAngle > 145)
{
_imageAngle = 145;
}
InvokeOnMainThread(() =>
{
// Rotate image and update text field
_handleImage.Transform = CGAffineTransform.MakeRotation(_imageAngle * ((float)Math.PI) / 180);
_currentValue = _imageAngle.ToCurrentValue(_minValue, _maxValue);
_valueLabel.Text = Convert.ToInt32(_currentValue).ToString();
if (RotationEnded != null)
{
RotationEnded(_currentValue);
}
});
};
_gestureRecognizer.RotationEnded += (nfloat obj) =>
{
Console.WriteLine("CurrentValue = " + _imageAngle.ToCurrentValue(_minValue, _maxValue));
_currentValue = _imageAngle.ToCurrentValue(_minValue, _maxValue);
_valueLabel.Text = Convert.ToInt32(_currentValue).ToString();
if (RotationEnded != null)
{
RotationEnded(_currentValue);
}
};
AddGestureRecognizer(_gestureRecognizer);
}