/// <summary>
/// Get updates from Viewport
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void ViewportPropertyChanged(object sender, PropertyChangedEventArgs e)
{
// Only check, if the Viewport is correct
if (map.Viewport.Width == 0 || map.Viewport.Height == 0)
{
return;
}
// Did Center changed?
if (e.PropertyName.Equals("Center"))
{
var centerPosition = map.Viewport.Center.ToForms();
if (Center.Equals(centerPosition))
{
return;
}
Center = centerPosition;
LastMoveToRegion = new MapSpan(Center, LastMoveToRegion.LatitudeDegrees, LastMoveToRegion.LongitudeDegrees);
// We don't need to resend event again
return;
}
// Did Viewport dimensions changed
if (e.PropertyName.Equals("Width") | e.PropertyName.Equals("Height"))
{
// Do this the first time after Viewport has correct size
if (init)
{
map.NavigateTo(LastMoveToRegion.ToMapsui());
init = false;
}
// Raise event, that VisibleRegion has changed
RaisePropertyChanged(nameof(VisibleRegion));
return;
}
// Did Viewport resolution changed
if (e.PropertyName.Equals("Resolution"))
{
var bottomLeft = map.Viewport.Extent.BottomLeft.ToForms();
var topRight = map.Viewport.Extent.TopRight.ToForms();
LastMoveToRegion = new MapSpan(Center, Math.Abs(bottomLeft.Latitude - topRight.Latitude), Math.Abs(bottomLeft.Longitude - topRight.Longitude));
}
RaisePropertyChanged(e.PropertyName);
}
/// <summary>
/// Methods
/// </summary>
/// Change Viewport
public void MoveToRegion(MapSpan mapSpan)
{
LastMoveToRegion = mapSpan ?? throw new ArgumentNullException(nameof(mapSpan));
map.NavigateTo(LastMoveToRegion.ToMapsui());
}