def test_load_from_ugrid_file():
data_dir = Path(__file__).absolute().parent / '../../data'
gr = Grid()
gr.setFlags(1, 1)
filename = str(data_dir / Path('cs_4.nc'))
gr.loadFrom2DUgrid(f'{filename}:physics')
nedges = gr.getNumberOfEdges()
print(f'nedges = {nedges}')
assert nedges == 192
ncells = gr.getNumberOfCells()
for icell in range(ncells):
for iedge in range(4):
edgeId, edgeSign = gr.getEdgeId(icell, iedge)
nodeIds = gr.getNodeIds(icell, iedge)
print(
f'cell {icell} edge {iedge}: edgeId = {edgeId}, {edgeSign} nodeIds = {nodeIds}'
)
# attaching a 3 components field to the grid
data = numpy.array(range(ncells * 4 * 3), numpy.float64)
gr.attach('myData', data)
def test_load_from_ugrid_file():
gr = Grid()
gr.setFlags(1, 1)
filename = str(DATA_DIR / Path('cs_4.nc'))
gr.loadFromUgrid2DFile(f'{filename}$physics')
nedges = gr.getNumberOfEdges()
print(f'nedges = {nedges}')
assert (nedges == 192)
ncells = gr.getNumberOfCells()
for icell in range(ncells):
for iedge in range(4):
edgeId, edgeSign = gr.getEdgeId(icell, iedge)
nodeIds = gr.getNodeIds(icell, iedge)
print(f"cell {icell} edge {iedge}: " +
f"edgeId = {edgeId}, {edgeSign} nodeIds = {nodeIds}")
# attaching a 3 components field to the grid
data = numpy.array(range(ncells * 4 * 3), numpy.float64)
gr.attach('myData', data)
num_bad_cells = gr.check()
assert (num_bad_cells == 0)
def test_attach_data():
# create the grid
gr = Grid()
# 2 cells
points = numpy.array([(0., 0., 0.), (1., 0., 0.), (1., 1., 0.),
(0., 1., 0.), (1., 0., 0.), (2., 0., 0.),
(2., 1., 0.), (1., 1., 0.)]).reshape((2, 4, 3))
gr.setPoints(points)
# create cell data, 3 per cell
nDataPerCell = 3
data = numpy.arange(0, 2 * nDataPerCell, dtype=numpy.float64).reshape(
(2, nDataPerCell))
gr.attach('mydata', data)
with TemporaryDirectory() as d:
fname = str(Path(d) / Path('grid.vtk'))
gr.dump(fname)
# read the data back to check the layout of the data
reader = vtk.vtkUnstructuredGridReader()
reader.SetFileName(fname)
reader.Update()
ugrid = reader.GetOutput()
arr = ugrid.GetCellData().GetArray('mydata')
assert (arr.GetNumberOfTuples() == gr.getNumberOfCells())
assert (arr.GetNumberOfComponents() == nDataPerCell)