/// <summary>
/// Simplify these intersection results by converting any grazing intersections
/// into simple intersections. Given that there are any grazes, the results will be
/// re-sorted so that the end of each graze comes at it's proper sequence along the
/// line that they relate to (this covers the fact that grazes may overlap). Any
/// consecutive duplicates will be removed too (covering the fact that the intersected
/// line may have passed through a node). Intersections at the end of the line will be
/// eliminated.
/// </summary>
/// <returns>The number of intersection after simplification.</returns>
internal uint Simplify()
{
// Return if there are no intersections.
if (m_Data == null || m_Data.Count == 0)
{
return(0);
}
// If we have any grazes, copy each intersection to a new results array (and
// for each graze, stick in the end of the graze as well).
uint ngraze = this.NumGraze;
if (ngraze > 0)
{
List <IntersectionData> newres = new List <IntersectionData>((int)(m_Data.Count + ngraze));
foreach (IntersectionData d in m_Data)
{
if (d.IsGraze)
{
newres.Add(new IntersectionData(d.P1));
newres.Add(new IntersectionData(d.P2));
}
else
{
newres.Add(d);
}
}
m_Data = newres;
}
// Ensure the intersections are sorted properly.
this.Sort(true);
// Ensure context is set properly.
SetContext(m_IntersectedObject.LineGeometry);
// Null out any consecutive duplicates, as well as intersections
// at the end of the line.
int nLeft = m_Data.Count; // How many have we got left?
// Reset any consecutive duplicates.
IntersectionData prev = m_Data[0];
IntersectionData cur = null;
for (int i = 1; i < m_Data.Count; i++, prev = cur)
{
cur = m_Data[i];
// Reset the previous intersection if it has the same sort value
// as the current one.
if (Math.Abs(cur.GetDeltaSort(prev)) < Constants.XYRES)
{
prev.Reset();
nLeft--;
}
}
// Reset anything at either end of the line.
foreach (IntersectionData d in m_Data)
{
if (d.IsEnd)
{
d.Reset();
nLeft--;
}
}
// Squeeze out the redundant intersections.
return(Squeeze(nLeft));
}
/// <summary>
/// Appends a simple intersection.
/// </summary>
/// <param name="xi">Easting of the intersection.</param>
/// <param name="yi">Northing of the intersection.</param>
/// <param name="sortval">Sort value (default=0.0).</param>
internal void Append(double xi, double yi, double sortval)
{
IntersectionData xsect = new IntersectionData(xi, yi, sortval);
Append(xsect);
}
/// <summary>
/// Appends a grazing intersection.
/// </summary>
/// <param name="x1">Easting of the 1st intersection.</param>
/// <param name="y1">Northing of the 1st intersection.</param>
/// <param name="x2">Easting of the 2nd intersection.</param>
/// <param name="y2">Northing of the 2nd intersection.</param>
internal void Append(double x1, double y1, double x2, double y2)
{
IntersectionData xsect = new IntersectionData(x1, y1, x2, y2);
Append(xsect);
}
/*
* // Multisegment
* uint Intersect(IPointGeometry[] locs)
* {
* return m_Object.Intersect(this, locs);
* }
*/
/// <summary>
/// Append intersection info to this object.
/// </summary>
/// <param name="xsect">The intersection info to append.</param>
void Append(IntersectionData xsect)
{
m_Data.Add(xsect);
}