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# -----------------------------------------------------------------------
# Copyright: 2010-2021, imec Vision Lab, University of Antwerp
# 2013-2021, CWI, Amsterdam
#
# Contact: astra@astra-toolbox.com
# Website: http://www.astra-toolbox.com/
#
# This file is part of the ASTRA Toolbox.
#
#
# The ASTRA Toolbox is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# The ASTRA Toolbox 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
#
# -----------------------------------------------------------------------
import astra
import numpy as np
# Create a 3D volume geometry.
# Parameter order: rows, colums, slices (y, x, z)
vol_geom = astra.create_vol_geom(64, 48, 32)
# Create volumes
# initialized to zero
v0 = astra.data3d.create('-vol', vol_geom)
# initialized to 3.0
v1 = astra.data3d.create('-vol', vol_geom, 3.0)
# initialized to a matrix. A may be a single or double array.
# Coordinate order: slice, row, column (z, y, x)
A = np.zeros((32, 64, 48))
v2 = astra.data3d.create('-vol', vol_geom, A)
# Projection data
# 2 projection directions, along x and y axis resp.
V = np.array([[ 1,0,0, 0,0,0, 0,1,0, 0,0,1],
[0,1,0, 0,0,0, -1,0,0, 0,0,1]],dtype=np.float)
# 32 rows (v), 64 columns (u)
proj_geom = astra.create_proj_geom('parallel3d_vec', 32, 64, V)
s0 = astra.data3d.create('-proj3d', proj_geom)
# Initialization to a scalar or zero works exactly as with a volume.
# Initialized to a matrix:
# Coordinate order: row (v), angle, column (u)
A = np.zeros((32, 2, 64))
s1 = astra.data3d.create('-proj3d', proj_geom, A)
# Retrieve data:
R = astra.data3d.get(v1)
# Delete all created data objects
astra.data3d.delete(v0)
astra.data3d.delete(v1)
astra.data3d.delete(v2)
astra.data3d.delete(s0)
astra.data3d.delete(s1)
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