/// <summary>
/// Determines whether a <see cref="MultiPoint"/> geometry is simple.
/// </summary>
/// <param name="multiPoints">
/// A <see cref="MultiPoint"/> geometry instance to be tested.
/// </param>
/// <returns>
/// Returns true if the <see cref="MultiPoint"/> geometry is simple,
/// otherwise returns false.
/// </returns>
/// <remarks>
/// A <see cref="MultiPoint"/> is simple if and only if it has
/// no repeated points.
/// </remarks>
public bool IsSimple(MultiPoint multiPoints)
{
if (multiPoints == null)
{
throw new ArgumentNullException("multiPoints");
}
if (multiPoints.IsEmpty)
{
return(true);
}
ISet points = new HashedSet();
int nCount = multiPoints.NumGeometries;
for (int i = 0; i < nCount; i++)
{
Point pt = (Point)multiPoints.GetGeometry(i);
Coordinate p = pt.Coordinate;
if (points.Contains(p))
{
return(false);
}
points.Add(p);
}
return(true);
}
/// <summary> Converts a MultiPoint to <MultiPoint Text> format, then
/// appends it to the writer.
///
/// </summary>
/// <param name="multiPoint"> the MultiPoint to process
/// </param>
/// <param name="writer"> the output writer to append to
/// </param>
private void AppendMultiPointText(MultiPoint multiPoint,
int level, TextWriter writer)
{
if (multiPoint.IsEmpty)
{
writer.Write(WktEmpty);
}
else
{
writer.Write(WktLParan);
int nCount = multiPoint.NumGeometries;
for (int i = 0; i < nCount; i++)
{
if (i > 0)
{
writer.Write(WktComma);
}
AppendCoordinate(((Point)multiPoint.GetGeometry(i)).Coordinate,
writer);
}
writer.Write(WktRParan);
}
}