/// <summary>
/// Delegate that's called whenever the index finds text with a window that overlaps the query window
/// </summary>
/// <param name="item">The item to process (expected to be some sort of <c>TextFeature</c>)</param>
/// <returns>True (always), indicating that the query should continue.</returns>
private bool OnTextFound(ISpatialObject item)
{
// Ignore test that's already been built
TextFeature text = (TextFeature)item;
if (text.IsBuilt)
{
return(true);
}
if (text.IsTopological)
{
// Get the label's reference position.
IPointGeometry posn = text.GetPolPosition();
// Try to find enclosing polygon
if (m_Polygon.IsEnclosing(posn))
{
m_Result = text;
return(false);
}
}
return(true);
}
/// <summary>
/// Re-calculates the polygon that encloses this label. This should be called whenever
/// the polygon reference position gets changed (if a polygon reference position is
/// not explicit, this will arise when the text itself is moved). Does nothing if the
/// label is not currently marked as "built".
/// </summary>
internal void RecalculateEnclosingPolygon()
{
if (!IsBuilt)
{
return;
}
if (!IsTopological)
{
return;
}
// If a container was previously defined, first check whether it's still the
// enclosing polygon (if so, we're done).
IPointGeometry p = GetPolPosition();
if (m_Container != null && m_Container.IsEnclosing(p))
{
return;
}
// If a container was previously defined, break the association with this label
if (m_Container != null)
{
m_Container.ReleaseLabel(this);
Debug.Assert(m_Container == null);
}
// Figure out which polygon now encloses this label (if any)
ISpatialIndex index = CadastralMapModel.Current.Index;
Polygon enc = new FindPointContainerQuery(index, p).Result;
if (enc != null)
{
enc.ClaimLabel(this);
}
}
