From 94d3e79a8617f88dc0219cfdeedfa3147833719d Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Mon, 24 Jun 2019 14:43:36 +0200
Subject: Initialize at openlb-1-3

---
 src/utilities/hyperplaneLattice2D.h | 105 ++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 src/utilities/hyperplaneLattice2D.h

(limited to 'src/utilities/hyperplaneLattice2D.h')

diff --git a/src/utilities/hyperplaneLattice2D.h b/src/utilities/hyperplaneLattice2D.h
new file mode 100644
index 0000000..9b8850d
--- /dev/null
+++ b/src/utilities/hyperplaneLattice2D.h
@@ -0,0 +1,105 @@
+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2018 Adrian Kummerlaender
+ *  E-mail contact: info@openlb.net
+ *  The most recent release of OpenLB can be downloaded at
+ *  <http://www.openlb.net/>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public
+ *  License along with this program; if not, write to the Free
+ *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA  02110-1301, USA.
+*/
+
+#ifndef HYPERPLANE_LATTICE_2D_H
+#define HYPERPLANE_LATTICE_2D_H
+
+#include "core/vector.h"
+#include "geometry/cuboidGeometry2D.h"
+#include "hyperplane2D.h"
+
+namespace olb {
+
+/// Parametrization of a hyperplane lattice (i.e. a line lattice).
+/**
+ * This class provides a common interface for describing how to discretize the intersection
+ * of a hyperplane given by Hyperplane2D<T> and the mother cuboid of CuboidGeometry2D<T>.
+ **/
+template <typename T>
+class HyperplaneLattice2D {
+private:
+  CuboidGeometry2D<T>&  _geometry;
+
+  /// \return max possible distance
+  int computeMaxLatticeDistance() const;
+  /// Compute _hyperplane.origin, _n so that the cuboid is right inside the geometry
+  void constructCuboid(int maxLatticeDistance);
+  /// Update _h, _n _hyperplane.u so that the length matches the given resolution
+  void setToResolution(int resolution);
+
+protected:
+  const Hyperplane2D<T> _hyperplane;
+
+  /// Origin vector of the lattice
+  /**
+   * Note that this origin is set to a outermost point of the intersection between
+   * cuboid geometry and hyperplane. Thus it is different from the Hyperplane2D<T>
+   * origin vector in the general case.
+   **/
+  Vector<T,2> _origin;
+  /// Direction vector of the lattice, normalized to grid width _h
+  Vector<T,2> _u;
+
+  /// Distance between discrete lattice points
+  T _h;
+  /// Number of lattice points in the direction of _u
+  int _n;
+
+public:
+  /// Constructor for automatic discretization.
+  /**
+   * i.e. the grid width is set to CuboidGeometry2D<T>::getMinDeltaR.
+   **/
+  HyperplaneLattice2D(CuboidGeometry2D<T>& geometry,
+                      Hyperplane2D<T>      hyperplane);
+  /// Constructor for discretization of a given resolution.
+  HyperplaneLattice2D(CuboidGeometry2D<T>& geometry,
+                      Hyperplane2D<T>      hyperplane,
+                      int                  resolution);
+  /// Constructor for discretization of a given grid width.
+  HyperplaneLattice2D(CuboidGeometry2D<T>& geometry,
+                      Hyperplane2D<T>      hyperplane,
+                      T                    h);
+
+  HyperplaneLattice2D(const HyperplaneLattice2D&) = default;
+
+  const Hyperplane2D<T>& getHyperplane() const;
+
+  /// Transform 1d lattice coordinates to their physical 2d location
+  Vector<T,2> getPhysR(const int& n) const;
+
+  /// \return _n
+  int getN() const;
+  /// \return _h
+  T getPhysSpacing() const;
+
+  /// \return _origin
+  Vector<T,2> getPhysOrigin() const;
+  /// \return _u
+  Vector<T,2> getVectorU() const;
+
+};
+
+}
+
+#endif
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