/// <summary>Paint the direction and destination indicators for each hex of the current shortest path.</summary>
/// <param name="this">Type: MapDisplay{THex} - The map to be painted.</param>
/// <param name="graphics">Type: Graphics - Object representing the canvas being painted.</param>
/// <param name="path">Type: <see cref="IDirectedPathCollection"/> -
/// A directed path (ie linked-list> of hexes to be highlighted with a direction arrow.</param>
static void PaintPathArrow <THex>(this MapDisplay <THex> @this, Graphics graphics, IDirectedPathCollection path
) where THex : MapGridHex
{
if (graphics == null)
{
throw new ArgumentNullException("graphics");
}
if (path == null)
{
throw new ArgumentNullException("path");
}
graphics.TranslateTransform(@this.CentreOfHexOffset.Width, @this.CentreOfHexOffset.Height);
if (path.PathSoFar == null)
{
@this.PaintPathDestination(graphics);
}
else
{
@this.PaintPathArrow(graphics, path.PathStep.HexsideEntry);
}
}
