/// <summary>
/// Pans the map the specified amount
/// </summary>
/// <param name="lm">the layout map to pan</param>
/// <param name="x">The distance to pan the map on x-axis in screen coord</param>
/// <param name="y">The distance to pan the map on y-axis in screen coord</param>
protected void PanMap(LayoutMap lm, float x, float y)
{
var mapOnScreen = PaperToScreen(lm.Rectangle);
lm.PanMap((lm.Envelope.Width / mapOnScreen.Width) * x, (lm.Envelope.Height / mapOnScreen.Height) * -y);
}
