QueryMDWorkspace on LineViewer cuts

[Owen Arnold]

The SliceViewer LineViewer exports new MDWorkspace (MDHistoWorkspaces), which can be properly plotted with the Plot MD option in Mantid Plot. However, if you inspect this workspace data using QueryMDWorkspace, the coordinates printed are not in terms of the original workspace coordinates. What this esentially means, is that there is no way to export the X,Y,E data from these workspaces. This is an urgent requirement on the WISH instrument.

[Owen Arnold]

refs #8104. This should now fix the defect.

Test demonstrates this working.

Changeset: 3bcf12ad55b7e082e80688e10f359170c2c6b1bf

[Owen Arnold]

Tester:

Run the following script in an old version of Mantid

CreateMDWorkspace(Dimensions='2',EventType='MDEvent',Extents='-10,10,-10,10',Names='Q_lab_x,Q_lab_y',Units='A,B',OutputWorkspace='test')
FakeMDEventData(InputWorkspace='test',UniformParams='1000',PeakParams='100000,0,0,1')

• Now open the 'test' workspace in the SliceViewer
• Use the LineViewer to draw a like from the bottom lhs of the screen diagonally to the top rhs.
• Look at the preview plot and notice the range for the x-axis scale Hit 'Apply' to create an output 1D workspace
• run QueryMDWorkspace on the line MDWorkspace you just generated. Notice that the X values are not the same as were generated on the plot, and the y values are missing.

Now repeat all of the above on your local build after git test start. You'll find that the X and Y values are the same (as you would expect for a rotation of this kind). The X range matches the scale in the preview plot region of the LineViewer.

[Michael Reuter]

This looks fine. I have one minor quibble. In the unit test, one of the checks says that there are six columns expected. I think that it's only five. This should be corrected to prevent any misleading messages should the test fail there.

[Owen Arnold]

refs #8104. Correct error message.

Changeset: 85a72aa7aeac70fc3f8a42380a3b46e8528f0ccf

[Owen Arnold]

Minor correction suggested has been made.

[Michael Reuter]

Merge remote-tracking branch 'origin/feature/8104_query_mdworkspace'

Full changeset: ​f89701ab2bc61d9e0c8d691328b181855a61488c

[Stuart Campbell]

This ticket has been transferred to github issue ​8949