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dumper_low_level.cc
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			/**
			* @file dumper_low_level.cc
			*
			* @author Fabian Barras <fabian.barras@epfl.ch>
			* @author Nicolas Richart <nicolas.richart@epfl.ch>
			*
			* @date creation: Mon Aug 17 2015
			*
			* @brief Example of dumper::DumperIOHelper low-level methods.
			*
			* @section LICENSE
			*
			* Copyright (©) 2015 EPFL (Ecole Polytechnique Fédérale de Lausanne) Laboratory
			* (LSMS - Laboratoire de Simulation en Mécanique des Solides)
			*
			* Akantu is free software: you can redistribute it and/or modify it under the
			* terms of the GNU Lesser General Public License as published by the Free
			* Software Foundation, either version 3 of the License, or (at your option) any
			* later version.
			*
			* Akantu 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 Lesser General Public License for more
			* details.
			*
			* You should have received a copy of the GNU Lesser General Public License
			* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
			*
			*/

			/* -------------------------------------------------------------------------- */
			#include "mesh.hh"
			#include "group_manager.hh"
			#include "element_group.hh"

			#include "dumper_elemental_field.hh"
			#include "dumper_nodal_field.hh"

			#include "dumper_paraview.hh"
			#include "locomotive_tools.hh"

			/* -------------------------------------------------------------------------- */
			using namespace akantu;

			int main(int argc, char * argv[]) {

			/* This example aims at illustrating how to manipulate low-level methods of
			DumperIOHelper.
			The aims is to visualize a colorized moving train with Paraview */

			initialize(argc, argv);

			// To start let us load the swiss train mesh and its mesh data information.
			// We aknowledge here a weel-known swiss industry for mesh donation.
			UInt spatial_dimension = 2;
			Mesh mesh(spatial_dimension);
			mesh.read("swiss_train.msh");
			mesh.createGroupsFromMeshData<std::string>("physical_names");

			Array<Real> & nodes = mesh.getNodes();
			UInt nb_nodes = mesh.getNbNodes();

			/* swiss_train.msh has the following physical groups that can be viewed with
			GMSH:
			"$MeshFormat
			2.2 0 8
			$EndMeshFormat
			$PhysicalNames
			6
			2 1 "red"
			2 2 "white"
			2 3 "lwheel_1"
			2 4 "lwheel_2"
			2 5 "rwheel_2"
			2 6 "rwheel_1"
			$EndPhysicalNames
			..."
			*/

			// Grouping nodes and elements belonging to train wheels (=four mesh data)
			ElementGroup & wheels_elements =
			mesh.createElementGroup("wheels", spatial_dimension);
			wheels_elements.append(mesh.getElementGroup("lwheel_1"));
			wheels_elements.append(mesh.getElementGroup("lwheel_2"));
			wheels_elements.append(mesh.getElementGroup("rwheel_1"));
			wheels_elements.append(mesh.getElementGroup("rwheel_2"));

			const Array<UInt> & lnode_1 = (mesh.getElementGroup("lwheel_1")).getNodes();
			const Array<UInt> & lnode_2 = (mesh.getElementGroup("lwheel_2")).getNodes();
			const Array<UInt> & rnode_1 = (mesh.getElementGroup("rwheel_1")).getNodes();
			const Array<UInt> & rnode_2 = (mesh.getElementGroup("rwheel_2")).getNodes();

			/* Note this Array is constructed with three components in order to warp train
			deformation on Paraview. A more appropriate way to do this is to set a
			padding in the NodalField (See example_dumpable_interface.cc.) */
			Array<Real> displacement(nb_nodes, 3);

			// ElementalField are constructed with an ElementTypeMapArray.
			ElementTypeMapArray<UInt> colour;
			mesh.initElementTypeMapArray(colour, 1, spatial_dimension, false, _ek_regular,
			true);

			/* ------------------------------------------------------------------------ */
			/* Dumper creation */
			/* ------------------------------------------------------------------------ */

			// Creation of two DumperParaview. One for full mesh, one for a filtered
			// mesh.
			DumperParaview dumper("train", "./paraview/dumper", false);
			DumperParaview wheels("wheels", "./paraview/dumper", false);

			// Register the full mesh
			dumper.registerMesh(mesh);

			// Register a filtered mesh limited to nodes and elements from wheels groups
			wheels.registerFilteredMesh(mesh, wheels_elements.getElements(),
			wheels_elements.getNodes());

			// Generate an output file of the two mesh registered.
			dumper.dump();
			wheels.dump();

			/* At this stage no fields are attached to the two dumpers. To do so, a
			dumper::Field object has to be created. Several types of dumper::Field
			exist. In this example we present two of them.

			NodalField to describe nodal displacements of our train.
			ElementalField handling the color of our different part.
			*/

			// NodalField are constructed with an Array.
			dumper::Field * displ_field = new dumper::NodalField<Real>(displacement);
			dumper::Field * colour_field = new dumper::ElementalField<UInt>(colour);

			// Register the freshly created fields to our dumper.
			dumper.registerField("displacement", displ_field);
			dumper.registerField("colour", colour_field);

			// For the dumper wheels, fields have to be filtered at registration.
			// Filtered NodalField can be simply registered by adding an Array<UInt>
			// listing the nodes.
			dumper::Field * displ_field_wheel = new dumper::NodalField<Real, true>(
			displacement, 0, 0, &(wheels_elements.getNodes()));
			wheels.registerField("displacement", displ_field_wheel);

			// For the ElementalField, an ElementTypeMapArrayFilter has to be created.
			ElementTypeMapArrayFilter<UInt> filtered_colour(
			colour, wheels_elements.getElements());

			dumper::Field * colour_field_wheel =
			new dumper::ElementalField<UInt, Vector, true>(filtered_colour);
			wheels.registerField("colour", colour_field_wheel);

			/* ------------------------------------------------------------------------ */
			// Now that the dumpers are created and the fields are associated, let's
			// paint and move the train!

			// Fill the ElementTypeMapArray colour according to mesh data information.
			fillColour(mesh, colour);

			// Apply displacement and wheels rotation.
			Real tot_displacement = 50.;
			Real radius = 1.;
			UInt nb_steps = 100;
			Real theta = tot_displacement / radius;

			Vector<Real> l_center(3);
			Vector<Real> r_center(3);

			for (UInt i = 0; i < spatial_dimension; ++i) {
			l_center(i) = nodes(14, i);
			r_center(i) = nodes(2, i);
			}

			for (UInt i = 0; i < nb_steps; ++i) {
			displacement.clear();

			Real angle = (Real)i / (Real)nb_steps * theta;
			applyRotation(l_center, angle, nodes, displacement, lnode_1);
			applyRotation(l_center, angle, nodes, displacement, lnode_2);
			applyRotation(r_center, angle, nodes, displacement, rnode_1);
			applyRotation(r_center, angle, nodes, displacement, rnode_2);

			for (UInt j = 0; j < nb_nodes; ++j) {
			displacement(j, 0) += (Real)i / (Real)nb_steps * tot_displacement;
			}
			// Output results after each moving steps for main and wheel dumpers.
			dumper.dump();
			wheels.dump();
			}

			finalize();

			return 0;
			}

rAKA/examples/io/dumper/dumper_low_level.ccb266e36a8204features/9-generate-a…

dumper_low_level.ccView Options

rAKA/examples/io/dumper/dumper_low_level.cc
b266e36a8204features/9-generate-a…

dumper_low_level.cc
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