MantidEV show distance between last points picked

[Dennis Mikkelson]

For the splatter plot pick mode, Christina would like to have information on the distance between two points (in Q-scalar and sqrt(h^2+k2+l^{2)) displayed.}

[Dennis Mikkelson]

RE 7248_MantidEV_show_distance_between_last_points_picked

Initial version, works if Q is in sample coordinates for both Q and HKL. In order for this to work for HKL when Q is in lab coordinates we will need to get and apply the goniometer rotation.

refs #7248

Changeset: 1f21e028bf77c60a0c9eda94cf64fae331f40a11

[Dennis Mikkelson]

RE 7248_MantidEV_show_distance_between_last_points_picked

The getUB() method of MantidEVWorker now includes a parameter indicating whether or not the UB should be converted to lab coordinates. If lab_coords is true, the goniometer rotation matrix is obtained from the first peak in the peaks workspace and is multiplied times UB to get a UB in lab_coordinates.

refs #7248

Changeset: fa9f48d765d3cc4a91cc27e8e65272701cf72532

[Dennis Mikkelson]

NOTES TO TESTER

The branch name is feature/7248_MantidEV_show_distance_between_last_points_picked

To test:

1. Start MantidEV, load some data, find peaks and find UB.
2. Switch to the Point Info tab on MantidEV
3. On MantidPlot, bring up the table view of the peaks workspace.
4. Choose a peak in the peaks workspace and enter the lab Q coordinates of that peak at the bottom of the Point Info tab.
5. Since the initial point was (0,0,0), the value displayed for the |Q2-Q1| should be the same as |Q| and the value displayed for |hkl2-hkl1| should be essentially sqrt(h^2+k2+l^2).

[Michael Reuter]

This is working quite nicely.

[Stuart Campbell]

This ticket has been transferred to github issue ​8094