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surface_generator_filter.cpp
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Wed, Aug 28, 18:40
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rTAMAAS tamaas
surface_generator_filter.cpp
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/**
*
* @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
*
* @section LICENSE
*
* Copyright (©) 2016 EPFL (Ecole Polytechnique Fédérale de
* Lausanne) Laboratory (LSMS - Laboratoire de Simulation en Mécanique des
* Solides)
*
* Tamaas 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.
*
* Tamaas 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 Tamaas. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
/* -------------------------------------------------------------------------- */
#include "surface_generator_filter.hh"
#include "fft_plan_manager.hh"
#include "fftransform.hh"
#include <cmath>
#include <iostream>
#include <random>
/* -------------------------------------------------------------------------- */
__BEGIN_TAMAAS__
template
<
UInt
dim
>
SurfaceGeneratorFilter
<
dim
>::
SurfaceGeneratorFilter
()
:
SurfaceGenerator
<
dim
>
(),
filter
(
nullptr
)
{}
/* -------------------------------------------------------------------------- */
template
<
UInt
dim
>
SurfaceGeneratorFilter
<
dim
>::~
SurfaceGeneratorFilter
(){
//delete filter;
}
/* -------------------------------------------------------------------------- */
template
<
UInt
dim
>
void
SurfaceGeneratorFilter
<
dim
>::
setFilter
(
Filter
<
dim
>
*
new_f
)
{
if
(
filter
!=
new_f
)
delete
filter
;
filter
=
new_f
;
}
/* -------------------------------------------------------------------------- */
template
<
UInt
dim
>
void
SurfaceGeneratorFilter
<
dim
>::
applyFilterOnSource
(){
GridHermitian
<
Real
,
dim
>
fft_white_noise
(
this
->
filter_coefficients
.
sizes
(),
this
->
filter_coefficients
.
lengths
(),
1
);
FFTransform
<
Real
,
dim
>
&
wn_plan
=
FFTPlanManager
::
get
().
createPlan
(
this
->
white_noise
,
fft_white_noise
);
wn_plan
.
forwardTransform
();
fft_white_noise
*=
filter_coefficients
;
FFTransform
<
Real
,
dim
>
&
surface_plan
=
FFTPlanManager
::
get
().
createPlan
(
this
->
grid
,
fft_white_noise
);
surface_plan
.
backwardTransform
();
FFTPlanManager
::
get
().
destroyPlan
(
this
->
white_noise
,
fft_white_noise
);
FFTPlanManager
::
get
().
destroyPlan
(
this
->
grid
,
fft_white_noise
);
}
/* -------------------------------------------------------------------------- */
template
<
UInt
dim
>
Grid
<
Real
,
dim
>
&
SurfaceGeneratorFilter
<
dim
>::
buildSurface
()
{
if
(
this
->
grid
.
dataSize
()
==
0
)
TAMAAS_EXCEPTION
(
"the size of the grid is zero, did you call setSizes() ?"
);
if
(
this
->
filter
==
nullptr
)
TAMAAS_EXCEPTION
(
"filter is null, did you call setFilter() ?"
);
// Resizing arrays
this
->
white_noise
.
resize
(
this
->
grid
.
sizes
());
auto
hermitian_dim
=
GridHermitian
<
Real
,
dim
>::
hermitianDimensions
(
this
->
grid
.
sizes
());
this
->
filter_coefficients
.
resize
(
hermitian_dim
.
data
());
/// Generating white noise with gaussian distribution
this
->
generateWhiteNoise
<
std
::
normal_distribution
<
Real
>>
();
/// Applying filters
filter
->
computeFilter
(
this
->
filter_coefficients
);
this
->
applyFilterOnSource
();
/// Normalizing surface for hrms independent of number of points
this
->
grid
*=
std
::
sqrt
(
this
->
grid
.
dataSize
());
return
this
->
grid
;
}
/* -------------------------------------------------------------------------- */
template
class
SurfaceGeneratorFilter
<
1
>
;
template
class
SurfaceGeneratorFilter
<
2
>
;
/* -------------------------------------------------------------------------- */
__END_TAMAAS__
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