Bug in VSI Peak Display

[OwenArnold]

This ticket is blocks : TRAC6363, TRAC6364

Reported by Dennis:

I checked on the problem with displaying the scatter plot and set of
peaks on the same VSI display. The problem seems to be due to the
choice of sample instead of lab coordinate systems. Specifically, if
ConvertToDiffractionMDWorkspace is used and lab coordinates are
specified, then found peaks are overlaid on the data correctly. If
sample coordinates are specified, the found peaks don't match the data.
Since ConvertToMD ONLY does not provide for using lab coordinates, the
problem we ran into at the demo yesterday makes sense. This will be
an unavoidable problem when ConvertToDiffractionMDWorkspace "goes away".

My initial thoughts are that this could be done in a staged approach...

1. Move the Transformation tools currently in the SliceViewer into a common location (Maybe Geometry).

2. Modify the way that the vtkPeaksMarkerFactory works see vtkPeaksSource.cpp line 69 so that it utilises the transform code.

3. To make things nicer, we should have an enum generated by each ConvertToMDAlgorithm type algorithm, which indicates what special coordinate system (if any the) outputs workspace is in, and store that on the IMDWorkspace. This was the approach originally discussed between Michael and myself. This might be best done under a separate ticket.

[OwenArnold]

This issue was originally trac ticket 6352

[OwenArnold]

http://trac.mantidproject.org/mantid/raw-attachment/ticket/6352/ticket6352_test.py
(uploaded by @mareuter on 2013-01-17T21:55:58)

---