[MGTL] Add a BoundaryElementsAtPoint.

This will be used in the element searcher.

MeshGeoToolsLib/BoundaryElementsAtPoint.cpp

+/**
+ * @copyright
+ * Copyright (c) 2012-2015, OpenGeoSys Community (http://www.opengeosys.org)
+ *            Distributed under a Modified BSD License.
+ *              See accompanying file LICENSE.txt or
+ *              http://www.opengeosys.org/LICENSE.txt
+ */
+
+#include "BoundaryElementsAtPoint.h"
+
+#include "GeoLib/Point.h"
+#include "MeshLib/Elements/Element.h"
+#include "MeshLib/Elements/Point.h"
+#include "MeshLib/Mesh.h"
+#include "MeshLib/MeshSearch/ElementSearch.h"
+#include "MeshLib/Node.h"
+
+#include "MeshGeoToolsLib/MeshNodeSearcher.h"
+
+namespace MeshGeoToolsLib
+{
+BoundaryElementsAtPoint::BoundaryElementsAtPoint(
+    MeshLib::Mesh const &mesh, MeshNodeSearcher &mshNodeSearcher,
+    GeoLib::Point const &point)
+    : _mesh(mesh), _point(point)
+{
+	auto const node_ids = mshNodeSearcher.getMeshNodeIDs(_point);
+	assert(node_ids.size() == 1);
+	std::array<MeshLib::Node*, 1> const nodes = {{
+	    const_cast<MeshLib::Node*>(_mesh.getNode(node_ids[0]))}};
+
+	_boundary_elements.push_back(new MeshLib::Point{nodes, 0, node_ids[0]});
+}
+
+BoundaryElementsAtPoint::~BoundaryElementsAtPoint()
+{
+	for (auto p : _boundary_elements)
+		delete p;
+}
+
+}  // MeshGeoToolsLib

MeshGeoToolsLib/BoundaryElementsAtPoint.h

+/**
+ * @copyright
+ * Copyright (c) 2012-2015, OpenGeoSys Community (http://www.opengeosys.org)
+ *            Distributed under a Modified BSD License.
+ *              See accompanying file LICENSE.txt or
+ *              http://www.opengeosys.org/LICENSE.txt
+ */
+
+#ifndef BOUNDARYELEMENTSATPOINT_H_
+#define BOUNDARYELEMENTSATPOINT_H_
+
+#include <vector>
+
+namespace GeoLib
+{
+class Point;
+}
+
+namespace MeshLib
+{
+class Mesh;
+class Element;
+}
+
+namespace MeshGeoToolsLib
+{
+class MeshNodeSearcher;
+
+/// This class collects point elements located at a given point elements.
+class BoundaryElementsAtPoint final
+{
+public:
+	/// Constructor
+	/// \param mesh             a mesh object
+	/// \param mshNodeSearcher  a MeshNodeSearcher object which is internally
+	/// used to search mesh nodes
+	/// \param point            a point object where edges are searched
+	BoundaryElementsAtPoint(MeshLib::Mesh const& mesh,
+	                       MeshNodeSearcher& mshNodeSearcher,
+	                       GeoLib::Point const& point);
+
+	~BoundaryElementsAtPoint();
+
+	MeshLib::Mesh const& getMesh() const
+	{
+		return _mesh;
+	}
+
+	GeoLib::Point const& getPoint() const
+	{
+		return _point;
+	}
+
+	/// Return the vector of boundary elements (i.e. points).
+	std::vector<MeshLib::Element*> const& getBoundaryElements() const
+	{
+		return _boundary_elements;
+	}
+
+private:
+	MeshLib::Mesh const& _mesh;
+	GeoLib::Point const& _point;
+	std::vector<MeshLib::Element*> _boundary_elements;
+};
+
+}  // end namespace MeshGeoToolsLib
+
+#endif  // BOUNDARYELEMENTSATPOINT_H_