/// <summary>
/// Find element containing (x,y) coordinate. Returns null if no element found.
/// <para>
/// If (x,y) is exacly on the boundary between two elements, one of them will be returned.
/// If (x,y) is matching exacly a node coordinate, one of the elements including the node will be returned.
/// </para>
/// </summary>
public MeshElement FindElement(double x, double y)
{
// Find potential elements for (x,y) point
Envelope targetEnvelope = new Envelope(x, x, y, y);
#if NTS173
IList potentialSourceElmts = _elementSearchTree.Query(targetEnvelope);
#else
IList <MeshElement> potentialSourceElmts = _elementSearchTree.Query(targetEnvelope);
#endif
// Loop over all potential elements
for (int i = 0; i < potentialSourceElmts.Count; i++)
{
#if NTS173
MeshElement element = (MeshElement)potentialSourceElmts[i];
#else
MeshElement element = potentialSourceElmts[i];
#endif
// Check if element includes the (x,y) point
if (element.Includes(x, y))
{
return(element);
}
}
return(null);
}
/// <summary>
/// Find element containing (x,y) coordinate. Returns null if no element found.
/// <para>
/// If (x,y) is exactly on the boundary between two elements, one of them will be returned.
/// If (x,y) is matching exacly a node coordinate, one of the elements including the node will be returned.
/// </para>
/// </summary>
public MeshElement FindElement(double x, double y)
{
// Find potential elements for (x,y) point
Envelope targetEnvelope = new Envelope(x, x, y, y);
IList <MeshElement> potentialSourceElmts = _elementSearchTree.Query(targetEnvelope);
// Loop over all potential elements
for (int i = 0; i < potentialSourceElmts.Count; i++)
{
MeshElement element = potentialSourceElmts[i];
// Check if element includes the (x,y) point
if (element.Includes(x, y))
{
return(element);
}
}
if (Tolerance <= 0)
{
return(null);
}
// Try again, now with tolerance
for (int i = 0; i < potentialSourceElmts.Count; i++)
{
MeshElement element = potentialSourceElmts[i];
// Check if element includes the (x,y) point
if (element.Includes(x, y, Tolerance))
{
return(element);
}
}
return(null);
}