def test_get_grid_cell_position():
shapes = 10 * [(50, 50), (50, 50), (50, 50), (80, 50)]
npt.assert_raises(ValueError, get_grid_cells_position, shapes=shapes,
dim=(1, 1))
CS = get_grid_cells_position(shapes=shapes)
npt.assert_equal(CS.shape, (42, 3))
npt.assert_almost_equal(CS[-1], [480., -250., 0])
def compute_positions(self, actors):
"""Compute the 3D coordinates of some actors.
The coordinates will lie on the xy-plane and form a 2D grid.
Parameters
----------
actors : list of `vtkProp3D` objects
Actors to be layout in a grid manner.
Returns
-------
list of 3-tuple
The computed 3D coordinates of every actors.
"""
shapes = self.get_cells_shape(actors)
# Add padding, if any, around every cell.
shapes = [np.array(self.cell_padding) / 2. + s for s in shapes]
positions = get_grid_cells_position(shapes, self.aspect_ratio,
self.dim)
positions += self.position_offset
return positions
