/// <summary>
/// Queries the data at the current cell location and determines the colour that should be displayed there.
/// </summary>
/// <returns></returns>
public override Color DoGetDisplayColour()
{
var value = ValueStore[east_col, north_row];
return(value == CellPassConsts.NullHeight ? Color.Empty : Palette.ChooseCutFillColour(value));
}
