/// <summary>
/// Shifts the positions of the coordinates until the coordinate at <code>firstCoordinateIndex</code>
/// is first.
/// </summary>
/// <param name="seq">The coordinate sequence to rearrange</param>
/// <param name="indexOfFirstCoordinate">The index of the coordinate to make first</param>
/// <param name="ensureRing">Makes sure that <paramref name="seq"/> will be a closed ring upon exit</param>
public static void Scroll(CoordinateSequence seq, int indexOfFirstCoordinate, bool ensureRing)
{
int i = indexOfFirstCoordinate;
if (i <= 0)
{
return;
}
// make a copy of the sequence
var copy = seq.Copy();
// test if ring, determine last index
int last = ensureRing ? seq.Count - 1 : seq.Count;
// fill in values
for (int j = 0; j < last; j++)
{
for (int k = 0; k < seq.Dimension; k++)
{
seq.SetOrdinate(j, k, copy.GetOrdinate((indexOfFirstCoordinate + j) % last, k));
}
}
// Fix the ring (first == last)
if (ensureRing)
{
for (int k = 0; k < seq.Dimension; k++)
{
seq.SetOrdinate(last, k, seq.GetOrdinate(0, k));
}
}
}
/// <summary>
/// Swaps two coordinates in a sequence.
/// </summary>
/// <param name="seq">seq the sequence to modify</param>
/// <param name="i">the index of a coordinate to swap</param>
/// <param name="j">the index of a coordinate to swap</param>
public static void Swap(CoordinateSequence seq, int i, int j)
{
if (i == j)
{
return;
}
for (int dim = 0; dim < seq.Dimension; dim++)
{
double tmp = seq.GetOrdinate(i, dim);
seq.SetOrdinate(i, dim, seq.GetOrdinate(j, dim));
seq.SetOrdinate(j, dim, tmp);
}
}
/// <summary>
/// Copies a coordinate of a <see cref="CoordinateSequence"/> to another <see cref="CoordinateSequence"/>.
/// The sequences may have different dimensions;
/// in this case only the common dimensions are copied.
/// </summary>
/// <param name="src">The sequence to copy coordinate from</param>
/// <param name="srcPos">The index of the coordinate to copy</param>
/// <param name="dest">The sequence to which the coordinate should be copied to</param>
/// <param name="destPos">The index of the coordinate in <see paramref="dest"/></param>
public static void CopyCoord(CoordinateSequence src, int srcPos, CoordinateSequence dest, int destPos)
{
int minDim = Math.Min(src.Dimension, dest.Dimension);
for (int dim = 0; dim < minDim; dim++)
{
double value = src.GetOrdinate(srcPos, dim);
dest.SetOrdinate(destPos, dim, value);
}
}
public override void SetOrdinate(int index, int ordinateIndex, double value) => _inner.SetOrdinate(Count - index - 1, ordinateIndex, value);
