/// <summary>
/// Get the next range (i.e. a contiguous range of integers) in ascending order.
/// </summary>
/// <param name="currentposition">The current position into this collection. Use 0 for the first time. On return, this is the next position.</param>
/// <param name="result">Returns the next contiguous range if the return value is <c>true</c>.</param>
/// <returns>True if the returned data are valid, false if there is no more data.</returns>
/// <remarks>You can use this function in a while loop:
/// <code>
/// int rangestart, rangecount;
/// int currentPosition=0;
/// while(GetNextRangeAscending(ref currentPosition, out rangestart, out rangecount))
/// {
/// // do your things here
/// }
/// </code></remarks>
public bool GetNextRangeAscending(ref int currentposition, out ContiguousIntegerRange result)
{
int rangestart;
int rangecount;
if (currentposition < 0 || currentposition >= Count)
{
result = ContiguousIntegerRange.Empty;
return(false);
}
else
{
rangestart = this[currentposition];
int previous = rangestart;
rangecount = 1;
for (currentposition = currentposition + 1; currentposition < Count; currentposition++)
{
if (this[currentposition] == (previous + 1))
{
previous++;
rangecount++;
}
else
{
break;
}
}
result = ContiguousIntegerRange.FromStartAndCount(rangestart, rangecount);
return(true);
}
}
/// <summary>
/// Get the next range (i.e. a contiguous range of integers) in descending order.
/// </summary>
/// <param name="currentposition">The current position into this collection. Use Count-1 for the first time. On return, this is the next position.</param>
/// <param name="result">Returns the next contiguous interger range if the return value is <c>true</c>.</param>
/// <returns>True if the range data are valid, false if there is no more data. Used as end-of-loop indicator.</returns>
/// <remarks>You can use this function in a while loop:
/// <code>
/// int rangestart, rangecount;
/// int currentPosition=selection.Count-1;
/// while(selection.GetNextRangeAscending(currentPosition,out rangestart, out rangecount))
/// {
/// // do your things here
/// }
/// </code></remarks>
public bool GetNextRangeDescending(ref int currentposition, out ContiguousIntegerRange result)
{
int rangestart, rangecount;
if (currentposition < 0 || currentposition >= Count)
{
result = ContiguousIntegerRange.Empty;
return(false);
}
else
{
rangestart = this[currentposition];
rangecount = 1;
for (currentposition = currentposition - 1; currentposition >= 0; currentposition--)
{
if (this[currentposition] == (rangestart - 1))
{
rangestart--;
rangecount++;
}
else
{
break;
}
}
result = ContiguousIntegerRange.FromStartAndCount(rangestart, rangecount);
return(true);
}
}
public object Deserialize(object o, Altaxo.Serialization.Xml.IXmlDeserializationInfo info, object parent)
{
var start = info.GetInt32("Start");
var count = info.GetInt32("Count");
return(ContiguousIntegerRange.FromStartAndCount(start, count));
}