protected virtual void UpdateManipulation(ManipulationDelta delta)
{
double newHeading = _headingBeforeManipulation;
double newZoomFact = _zoomFactorBeforeManipulation * delta.Scale;
MatrixDouble m = MatrixDouble.Identity;
if (TranslationEnabled)
{
m = MatrixDouble.CreateTranslation(-(delta.Translation.X / _zoomFactorBeforeManipulation), -(delta.Translation.Y / _zoomFactorBeforeManipulation));
m = m * _reverseRotationMatrix;
}
if (ZoomEnabled)
{
double scaleFactor = _zoomFactorBeforeManipulation / newZoomFact;
m = m * MatrixDouble.CreateScale(scaleFactor, _manipulationStartPoint);
}
if ((delta.Rotation != 0.0) && RotationEnabled)
{
//Add the Rotation from the Manipulation
MatrixDouble rotation = MatrixDouble.CreateRotation(-TransformHelper.DegToRad(delta.Rotation), _manipulationStartPoint);
m = m * rotation;
newHeading = (_headingBeforeManipulation + delta.Rotation) % 360;
if (newHeading < 0)
{
newHeading += 360;
}
}
double zoomLevel = _map.ViewPortProjection.GetZoomLevel(newZoomFact);
CartesianPoint viewPortCenter = new CartesianPoint(m.Transform(_viewPortCenterBeforeManipulation));
if (Update != null)
{
TouchMapEventArgs eventArgs = new TouchMapEventArgs();
eventArgs.Heading = newHeading;
eventArgs.ZoomLevel = zoomLevel;
eventArgs.ViewPortCenter = viewPortCenter;
OnUpdate(eventArgs);
}
if (AutoUpdateMap)
{
_map.Heading = newHeading;
_map.ZoomLevel = zoomLevel;
_map.ViewPortCenter = viewPortCenter;
}
}
protected virtual void OnUpdate(TouchMapEventArgs eventArgs)
{
Update?.Invoke(this, eventArgs);
}
