/// <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(this.Zoom + (e.Delta / Mouse.MouseWheelDeltaForOneLine));
Point mouse = e.GetPosition(this);
this.BeginUpdate();
_offsetX.ChangeZoom(newZoom, mouse.X);
_offsetY.ChangeZoom(newZoom, mouse.Y);
this.Zoom = newZoom; // Set this after we've altered the offsets
this.EndUpdate();
}
private static object OnZoomPropertyCoerceValue(DependencyObject d, object baseValue)
{
return(TileGenerator.GetValidZoom((int)baseValue));
}