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#include "ismrmrd/ismrmrd.h"
#include <boost/test/unit_test.hpp>
using namespace ISMRMRD;
BOOST_AUTO_TEST_SUITE(QuaternionTest)
BOOST_AUTO_TEST_CASE(test_directions_to_quaternion)
{
float read_dir[3] = {1.0, 0, 0};
float phase_dir[3] = {0, 1.0, 0};
float slice_dir[3] = {0, 0, 1.0};
float quaternion[4];
/* convert the direction vectors to a quaternion and verify */
ismrmrd_directions_to_quaternion(read_dir, phase_dir, slice_dir, quaternion);
BOOST_CHECK_EQUAL(quaternion[0], 0.0);
BOOST_CHECK_EQUAL(quaternion[1], 0.0);
BOOST_CHECK_EQUAL(quaternion[2], 0.0);
BOOST_CHECK_EQUAL(quaternion[3], 1.0);
}
BOOST_AUTO_TEST_CASE(test_quaternion_to_directions)
{
float read_dir[3];
float phase_dir[3];
float slice_dir[3];
float quaternion[4] = {0.0, 0.0, 0.0, 1.0};
/* convert the quaternion back to direction cosines and verify */
ismrmrd_quaternion_to_directions(quaternion, read_dir, phase_dir, slice_dir);
BOOST_CHECK_EQUAL(read_dir[0], 1.0);
BOOST_CHECK_EQUAL(read_dir[1], 0.0);
BOOST_CHECK_EQUAL(read_dir[2], 0.0);
BOOST_CHECK_EQUAL(phase_dir[0], 0.0);
BOOST_CHECK_EQUAL(phase_dir[1], 1.0);
BOOST_CHECK_EQUAL(phase_dir[2], 0.0);
BOOST_CHECK_EQUAL(slice_dir[0], 0.0);
BOOST_CHECK_EQUAL(slice_dir[1], 0.0);
BOOST_CHECK_EQUAL(slice_dir[2], 1.0);
}
BOOST_AUTO_TEST_CASE(test_sign_of_directions)
{
float read_dir[3] = {1.0, 0, 0};
float phase_dir[3] = {0, 1.0, 0};
float slice_dir[3] = {0, 0, 1.0};
/* check that determinant is > 0 */
BOOST_REQUIRE(ismrmrd_sign_of_directions(read_dir, phase_dir, slice_dir) > 0);
/* flip sign of third column and check that determinant is < 0 */
slice_dir[0] = -slice_dir[0];
slice_dir[1] = -slice_dir[1];
slice_dir[2] = -slice_dir[2];
BOOST_REQUIRE(ismrmrd_sign_of_directions(read_dir, phase_dir, slice_dir) < 0);
}
BOOST_AUTO_TEST_SUITE_END()
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