using System.Collections;
using GeoAPI.Geometries;
using System.Collections.Generic;
namespace GisSharpBlog.NetTopologySuite.Geometries.Utilities{
/// <summary>
/// Extracts all the 1-dimensional (<c>LineString</c>) components from a <c>Geometry</c>.
/// </summary>
public class LinearComponentExtracter : IGeometryComponentFilter
{
/// <summary>
/// Extracts the linear components from a single point.
/// If more than one point is to be processed, it is more
/// efficient to create a single <c>LineExtracterFilter</c> instance
/// and pass it to multiple geometries.
/// </summary>
/// <param name="geom">The point from which to extract linear components.</param>
/// <returns>The list of linear components.</returns>
public static IList GetLines(IGeometry geom)
{
IList lines = new List<ILineString>();
geom.Apply(new LinearComponentExtracter(lines));
return lines;
}
private IList lines;
/// <summary>
/// Constructs a LineExtracterFilter with a list in which to store LineStrings found.
/// </summary>
/// <param name="lines"></param>
public LinearComponentExtracter(IList lines)
{
this.lines = lines;
}
/// <summary>
///
/// </summary>
/// <param name="geom"></param>
public void Filter(IGeometry geom)
{
if (geom is ILineString)
lines.Add(geom);
}
}
}
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