/// <summary>
/// Checks whether this closed shape overlaps a line
/// </summary>
/// <param name="shape">Positions defining a closed outline (the last position
/// must coincide with the first position). At least 3 positions.</param>
/// <param name="shapeWindow">The extent of <paramref name="shape"/></param>
/// <param name="line">The line to compare with the shape</param>
/// <returns>True if the shape overlaps the line</returns>
internal bool IsOverlap(LineGeometry line)
{
// Get the window of the line
IWindow lwin = line.Extent;
// The two windows have to overlap.
if (!m_Extent.IsOverlap(lwin))
{
return(false);
}
// If either end of the line falls inside this shape, we've got overlap.
IPointGeometry p = line.Start;
if (m_Extent.IsOverlap(p) && Geom.IsPointInClosedShape(this.Data, p))
{
return(true);
}
p = line.End;
if (m_Extent.IsOverlap(p) && Geom.IsPointInClosedShape(this.Data, p))
{
return(true);
}
// The only thing left is a possible interesection between
// the shape and the line.
return(IsIntersect(line));
}
/// <summary>
/// Checks whether this closed shape overlaps (encloses) a point.
/// </summary>
/// <param name="point">The position to check</param>
/// <returns>True if the shape overlaps the point</returns>
internal bool IsOverlap(IPointGeometry point)
{
return(m_Extent.IsOverlap(point) && Geom.IsPointInClosedShape(this.Data, point));
}
