/// <summary>
/// Alters the zoom of the map, maintaing the same point underneath the mouse at the new zoom level.
/// </summary>
/// <param name="e">The MouseWheelEventArgs that contains the event data.</param>
protected override void OnMouseWheel(MouseWheelEventArgs e)
{
base.OnMouseWheel(e);
int newZoom = TileGenerator.GetValidZoom(Zoom + (e.Delta / Mouse.MouseWheelDeltaForOneLine));
Point mouse = e.GetPosition(this);
BeginUpdate();
_offsetX.ChangeZoom(newZoom, mouse.X);
_offsetY.ChangeZoom(newZoom, mouse.Y);
// Set this after we've altered the offsets.
Zoom = newZoom;
EndUpdate();
}
private static object OnZoomPropertyCoerceValue(DependencyObject d, object baseValue)
{
return(TileGenerator.GetValidZoom((int)baseValue));
}
