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test_vtk_files.py
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Sun, Jul 13, 09:50

test_vtk_files.py
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import io
import numpy as np
from numpy import all, min, max
from vtk import (
vtkXMLRectilinearGridReader,
vtkXMLImageDataReader,
vtkXMLStructuredGridReader,
)
from vtk.util.numpy_support import vtk_to_numpy
from conftest import get_vtk_data
from uvw import (
ImageData,
RectilinearGrid,
StructuredGrid,
DataArray,
)
def test_rectilinear_grid(field_data,
compression_fixture,
format_fixture,
ordering_fixture):
coords, r, e_r = field_data
dim = r.ndim
f = io.StringIO()
compress = compression_fixture.param
format = format_fixture.param
rect = RectilinearGrid(f, coords, compression=compress)
rect.addPointData(
DataArray(r, range(dim), 'point', ordering_fixture.param),
vtk_format=format
)
rect.addCellData(
DataArray(e_r, range(dim), 'cell', ordering_fixture.param),
vtk_format=format
)
rect.write()
reader = vtkXMLRectilinearGridReader()
# Testing the xml pretty print output as well
pretty_sstream = io.StringIO(str(rect.writer))
for ss in [f, pretty_sstream]:
vtk_r, vtk_e_r = get_vtk_data(reader, ss)
vtk_r = vtk_r.reshape(r.shape, order='F')
vtk_e_r = vtk_e_r.reshape(e_r.shape, order='F') \
.transpose(ordering_fixture.transp(dim))
assert all(vtk_r == r)
assert all(vtk_e_r == e_r)
def test_image_data(field_data,
compression_fixture,
format_fixture,
ordering_fixture):
coords, r, e_r = field_data
dim = r.ndim
f = io.StringIO()
compress = compression_fixture.param
format = format_fixture.param
with ImageData(
f,
[(min(x), max(x)) for x in coords],
[x.size for x in coords],
compression=compress) as fh:
fh.addPointData(
DataArray(r, range(dim), 'point', ordering_fixture.param),
vtk_format=format
)
fh.addCellData(
DataArray(e_r, range(dim), 'cell', ordering_fixture.param),
vtk_format=format
)
reader = vtkXMLImageDataReader()
vtk_r, vtk_e_r = get_vtk_data(reader, f)
vtk_r = vtk_r.reshape(r.shape, order='F')
vtk_e_r = vtk_e_r.reshape(e_r.shape, order='F') \
.transpose(ordering_fixture.transp(dim))
assert all(vtk_r == r)
assert all(vtk_e_r == e_r)
def test_structured_grid(compression_fixture, format_fixture):
f = io.StringIO()
N = 5
r = np.linspace(0, 1, N)
theta = np.linspace(0, 2*np.pi, 5*N)
theta, r = np.meshgrid(theta, r, indexing='ij')
x = r*np.cos(theta)
y = r*np.sin(theta)
points = np.vstack([x.ravel(), y.ravel()]).T
compress = compression_fixture.param
format = format_fixture.param
grid = StructuredGrid(f, points, (N, 5*N), compression=compress)
data = np.exp(-4*r**2)
grid.addPointData(DataArray(data, reversed(range(2)), 'data'),
vtk_format=format)
grid.write()
reader = vtkXMLStructuredGridReader()
reader.SetReadFromInputString(True)
reader.SetInputString(f.getvalue())
reader.Update()
output = reader.GetOutput()
vtk_data = vtk_to_numpy(output.GetPointData().GetArray('data'))
vtk_data = vtk_data.reshape(data.shape, order='C')
assert all(vtk_data == data)

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