/// <summary>
/// Splits the polygon to a list of points at given distances.
/// </summary>
/// <param name="length">The length.</param>
/// <returns>List<UV>.</returns>
public List <UV> SplitToPoints(double length)
{
List <UV> pnts = new List <UV>();
pnts.Add(this.Start);
double totalLength = 0;
double u = 0;
for (int i = 0; i < this.PointCount; i++)
{
int j = (i == this.PointCount - 1) ? 0 : i + 1;
if (!this.Closed && j == 0)
{
break;
}
UV vector = this.Points[j] - this.Points[i];
double dist = vector.GetLength();
vector /= dist;
while (u < totalLength + dist)
{
pnts.Add(this.Points[i] + (u - totalLength) * vector);
u += length;
}
totalLength += dist;
}
if (this.End != pnts[pnts.Count - 1] && !this.Closed)
{
pnts.Add(this.End);
}
UV current = pnts[0];
List <UV> pnts2 = new List <UV>()
{
current
};
for (int i = 0; i < pnts.Count; i++)
{
if (pnts[i] != current)
{
current = pnts[i];
pnts2.Add(current);
}
}
pnts.Clear();
pnts = null;
return(pnts2);
}
/// <summary>
/// Splits this polyline to a list of polylines with equal lengths
/// </summary>
/// <param name="length">The length.</param>
/// <param name="tolerance">The tolerance by default set to main documents absolute tolerance.</param>
/// <returns>List<PLine>.</returns>
public List <PLine> SplitToPLines(double length, double tolerance = OSMDocument.AbsoluteTolerance)
{
List <int> indexes = new List <int>()
{
0
};
List <UV> pnts = new List <UV>();
double totalLength = 0;
double u = length;
for (int i = 0; i < this.PointCount; i++)
{
pnts.Add(this.Points[i]);
//indexes.Add(pnts.Count - 1);
int j = (i == this.PointCount - 1) ? 0 : i + 1;
if (!this.Closed && j == 0)
{
break;
}
UV vector = this.Points[j] - this.Points[i];
double dist = vector.GetLength();
vector /= dist;
while (u < totalLength + dist)
{
var p = this.Points[i] + (u - totalLength) * vector;
if (!this._pntSet.Contains(p))
{
pnts.Add(p);
}
indexes.Add(pnts.Count - 1);
u += length;
}
totalLength += dist;
}
if (this.Closed)
{
if (this.Start != pnts[pnts.Count - 1])
{
pnts.Add(this.Start);
}
indexes.Add(pnts.Count - 1);
}
else
{
if (this.End != pnts[pnts.Count - 1])
{
pnts.Add(this.End);
}
indexes.Add(pnts.Count - 1);
}
List <PLine> plines = new List <PLine>();
if (indexes.Count == 2)
{
plines.Add(this);
}
for (int i = 0; i < indexes.Count - 1; i++)
{
var points = pnts.GetRange(indexes[i], indexes[i + 1] - indexes[i] + 1);
if (points[0].DistanceTo(points[1]) < tolerance)
{
points.RemoveAt(1);
}
if (points.Count > 1)
{
if (points[points.Count - 1].DistanceTo(points[points.Count - 2]) < tolerance)
{
points.RemoveAt(points.Count - 2);
}
if (points.Count > 1)
{
PLine pline = new PLine(points, false);
plines.Add(pline);
}
}
}
return(plines);
}