/// <summary>
/// If a Shape has multiple parts, this will create a separate polyline for each part.
/// </summary>
/// <param name="mwShape">A MapWinGIS.Shape that should be a PolyLine shape type</param>
/// <returns>A List of Polylines derived from the various shapes</returns>
public static List <PolyLine> mwShape_To_PolyLines(MapWinGIS.Shape mwShape)
{
if (Adapter.GetCategory(mwShape) != ShapeCategories.Line)
{
throw new ArgumentException("The Split method only takes Polyline shape types.");
}
List <PolyLine> newLines = new List <PolyLine>();
if (mwShape.NumParts <= 1)
{
PolyLine Part = new PolyLine();
for (int I = 0; I < mwShape.numPoints; I++)
{
Part.Add_Point(mwShape.get_Point(I));
}
newLines.Add(Part);
return(newLines);
}
int PartIndex = 0;
for (int P = 0; P < mwShape.NumParts; P++)
{
PolyLine Part = new PolyLine();
int Pnext = mwShape.get_Part(P);
for (int I = PartIndex; I < Pnext; I++)
{
Part.Add_Point(mwShape.get_Point(I));
}
newLines.Add(Part);
}
return(newLines);
}
/// <summary>
/// Converts a list of polylines into a single multi-part shape
/// </summary>
/// <param name="Polylines"></param>
/// <returns></returns>
public static MapWinGIS.Shape PolyLines_To_mwShape(List <PolyLine> Polylines)
{
MapWinGIS.Shape mwShape = new MapWinGIS.Shape();
bool res;
res = mwShape.Create(MapWinGIS.ShpfileType.SHP_POLYLINEZ);
if (res != true)
{
throw new ApplicationException(mwShape.get_ErrorMsg(mwShape.LastErrorCode));
}
int idx = 0;
for (int iPart = 0; iPart < Polylines.Count; iPart++)
{
PolyLine Part = Polylines[iPart];
// we only cal set_part if we have multiple polylines
if (Polylines.Count > 0)
{
mwShape.set_Part(iPart, idx);
}
for (int iPoint = 0; iPoint < Part.Points.Count; iPoint++)
{
mwShape.InsertPoint(Part.Points[iPoint].To_mwPoint(), ref idx);
idx++;
}
}
return(mwShape);
} // End PolyLines_To_mwShape
/// <summary>
/// Determines the shortest distance to any of the lines in the polyline.
/// </summary>
/// <param name="PolyLn">The polyline to investigate</param>
/// <returns>Double, the distance to the closest segment</returns>
public double DistanceTo(PolyLine PolyLn)
{
//I'm not sure yet how to do this faster. Extents won't really help here.
List <Segment> Segs = PolyLn.ToSegments();
double dist = double.PositiveInfinity;
for (int iSeg = 0; iSeg < Segs.Count; iSeg++)
{
double test = Segs[iSeg].DistanceTo(this);
if (test < dist)
{
dist = test;
}
}
return(dist);
}
