/// <summary>
/// Confirms that a potential link is valid. For a link to be valid, the
/// midpoint of the link must fall inside the specified polygon, and the
/// line connecting the 2 points cannot intersect anything.
/// </summary>
/// <param name="other">The end of the proposed point to link to.</param>
/// <param name="pol">The polygon the link must fall completely inside.</param>
/// <returns>True if link is valid.</returns>
internal bool IsLinkValid(PolygonLink other, Polygon pol)
{
// 22-MAR-00 There may be no point at a corner.
if (m_Point == null || other.Point == null)
{
return(false);
}
// Get the midpoint of the link.
IPosition mid = Geom.MidPoint(m_Point, other.Point);
// Confirm the midpoint falls inside the right polygon.
if (!pol.IsRingEnclosing(mid))
{
return(false);
}
// Locate any intersections formed by the proposed link (considering
// only the currently active theme).
LineGeometry seg = new SegmentGeometry(m_Point, other.m_Point);
IntersectionFinder xsect = new IntersectionFinder(seg, true);
// The proposed link is not valid if it intersects anything
// along the length of the segment, or has any grazes.
if (xsect.IsGrazing || xsect.IsSplitNeeded)
{
return(false);
}
return(true);
}
