/// <summary>
/// Removes an intersection from this index
/// </summary>
/// <param name="x">The intersection to remove (on successful removal, the
/// <see cref="Intersection.IsIndexed"/> property will be set false)
/// </param>
internal void RemoveIntersection(Intersection x)
{
if (m_ExtraData.Remove(x))
x.IsIndexed = false;
}
/// <summary>
/// Includes an intersection in this index.
/// </summary>
/// <param name="x">The intersection to add to the index (and sets the
/// <see cref="Intersection.IsIndexed"/> property to true)
/// </param>
internal void AddIntersection(Intersection x)
{
m_ExtraData.Add(x);
x.IsIndexed = true;
}
/// <summary>
/// Merges divider sections that are incident on the specified intersection. This gets
/// called when one of the lines causing an intersection is being removed (deactivated).
/// </summary>
/// <param name="x">An intersection that is being removed</param>
/// <returns>The number of sections after the merge</returns>
internal override int MergeSections(Intersection x)
{
for (int i=0; i<(m_Sections.Count-1); i++)
{
IDivider a = m_Sections[i];
if (a.To == x)
{
IDivider b = m_Sections[i+1];
// If either divider is an overlap, it would be BAD to merge
if (a is SectionDivider && b is SectionDivider)
{
m_Sections.RemoveAt(i+1);
m_Sections[i] = new SectionDivider(Line, a.From, b.To);
}
}
}
return m_Sections.Count;
}