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#coding=utf8
########################################################################
### ###
### Created by Martin Genet, 2016 ###
### ###
### École Polytechnique, Palaiseau, France ###
### ###
########################################################################
import dolfin
import numpy
import myVTKPythonLibrary as myVTK
from myVTKPythonLibrary.mat_vec_tools import *
########################################################################
def get_ExprIm_cpp(
im_dim,
im_type="im",
im_is_def=False,
verbose=False):
assert (im_dim in (2,3))
assert (im_type in ("im","grad"))
ExprIm_cpp = '''\
#include <string.h>
#include <vtkSmartPointer.h>
#include <vtkXMLImageDataReader.h>
#include <vtkImageData.h>'''+('''
#include <vtkImageGradient.h>''')*(im_type=="grad")+'''
#include <vtkImageInterpolator.h>
namespace dolfin
{
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vtkSmartPointer<vtkImageInterpolator> interpolator;'''+('''
const Function* U;
mutable Array<double> UX;
mutable Array<double> x;''')*(im_is_def)+('''
mutable Array<double> X;''')*(not im_is_def)*(im_dim==2)+'''
public:
MyExpr():
Expression('''+('''2''')*(im_type=="grad")+''')'''+(''',
UX('''+str(im_dim)+'''),
x(3)''')*(im_is_def)+(''',
X(3)''')*(not im_is_def)*(im_dim==2)+'''
{
}
void init('''+('''
const Function &UU,''')*(im_is_def)+('''
const double &Z=0.''')*(im_dim==2)+''')
{'''+('''
U = &UU;''')*(im_is_def)+('''
x[2] = Z;''')*(im_is_def)*(im_dim==2)+('''
X[2] = Z;''')*(not im_is_def)*(im_dim==2)+'''
}
void init_image(
const char* filename,
const char* interpol_mode="'''+('''linear''')*(im_type=="im")+('''nearest''')*(im_type=="grad")+'''",
const double &interpol_out_value='''+('''0.''')*(im_type=="im")+('''1.''')*(im_type=="grad")+''')
{
vtkSmartPointer<vtkXMLImageDataReader> reader = vtkSmartPointer<vtkXMLImageDataReader>::New();
reader->SetFileName(filename);
reader->Update();'''+('''
vtkSmartPointer<vtkImageGradient> gradient = vtkSmartPointer<vtkImageGradient>::New();
#if VTK_MAJOR_VERSION >= 6
gradient->SetInputData(reader->GetOutput());
#else
gradient->SetInput(reader->GetOutput());
#endif
gradient->SetDimensionality('''+str(im_dim)+''');
gradient->Update();''')*(im_type=="grad")+'''
interpolator = vtkSmartPointer<vtkImageInterpolator>::New();
if (strcmp(interpol_mode, "nearest") == 0)
interpolator->SetInterpolationModeToNearest();
}
else if (strcmp(interpol_mode, "linear") == 0)
interpolator->SetInterpolationModeToLinear();
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else if (strcmp(interpol_mode, "cubic") == 0)
{
interpolator->SetInterpolationModeToCubic();
}
else
{
std::cout << "Interpolator interpol_mode (" << interpol_mode << ") must be \\"nearest\\", \\"linear\\" or \\"cubic\\". Aborting." << std::endl;
assert(0);
}
interpolator->SetOutValue(interpol_out_value);
interpolator->Initialize('''+('''reader->GetOutput()''')*(im_type=="im")+('''gradient->GetOutput()''')*(im_type=="grad")+''');
interpolator->Update();
}
void eval(Array<double>& values, const Array<double>& position) const
{'''+('''
std::cout << "position = " << position.str(1) << std::endl;''')*(verbose)+('''
U->eval(UX, position);'''+('''
std::cout << "UX = " << UX.str(1) << std::endl;''')*(verbose)+'''
x[0] = position[0] + UX[0];
x[1] = position[1] + UX[1];'''+('''
std::cout << "x = " << x.str(1) << std::endl;''')*(verbose)+'''
interpolator->Interpolate(x.data(), values.data());''')*(im_is_def)*(im_dim==2)+('''
U->eval(UX, position);'''+('''
std::cout << "UX = " << UX.str(1) << std::endl;''')*(verbose)+'''
x = position + UX;'''+('''
std::cout << "x = " << x.str(1) << std::endl;''')*(verbose)+'''
interpolator->Interpolate(x.data(), values.data());''')*(im_is_def)*(im_dim==3)+('''
X[0] = position[0];
X[1] = position[1];'''+('''
std::cout << "X = " << X.str(1) << std::endl;''')*(verbose)+'''
interpolator->Interpolate(X.data(), values.data());''')*(not im_is_def)*(im_dim==2)+('''
interpolator->Interpolate(position.data(), values.data());''')*(not im_is_def)*(im_dim==3)+('''
std::cout << "values = " << values.str(1) << std::endl;''')*(verbose)+'''
}