New algorithm to save json data from workspace

[peterfpeterson]

This issue was originally TRAC 9391

This will be used with auto-reduction to write out data for interactive visualization in http://monitor.sns.gov/.

For a single curve

{
  "plot name": {"y": [0, 1, 2, 3...], "x": [0, 1, 2, 3...], "e": [0, 1, 2, 3...],
                       "xlabel": "x axis label", "ylabel": "y axis label", "title": "long plot title"} 
}

The plot name should be a short name that can be used as a handle for the plot. For instance, the web monitor will look for a "main_output" plot in the json file, so the plot name should be an algorithm input property.

For more than one curve, just add entries to the top-level dictionary.

{
  "plot name 1": {"y": [0, 1, 2, 3...], "x": [0, 1, 2, 3...], "e": [0, 1, 2, 3...], ...},
  "plot name 2": {"y": [0, 1, 2, 3...], "x": [0, 1, 2, 3...], "e": [0, 1, 2, 3...], ...} 
}

There still needs to be a way to have multiple sub-plots (e.g. stacked frames for S(Q) and G(r))

Only MatrixWorkspace needs to be supported.

[peterfpeterson]

@OwenArnold (2014-05-01T08:15:32):
Does this ticket provide a full schema for the JSON? Should we capture the schema somewhere?

Also, I'm not sure if there's a portable JSON generator/parser for C++ that would help you here.

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@stuartcampbell (2014-05-01T13:00:43):
There is [http://jsoncpp.sourceforge.net] and Qt5 has JSON support! :-) [http://qt-project.org/doc/qt-5/json.html]

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@NickDraper (2014-05-07T08:48:30):
Stuart forgot to "Clarify"

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@NickDraper (2014-05-07T08:57:22):
Of course I suspect we want something at the framework level, not the UI, so QT is probably out.

JSON is used in the Script Library and the remote algorithms

Take a look at MantidRemote/src/simplejson.cpp

Also the script repo uses <boost/property_tree/json_parser.hpp> in ScriptRepository\src\ScriptRepositoryImpl.cpp

Could you take a look at these to see if they fit the bill?

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@NickDraper (2014-06-23T08:01:13):
Moved to Backlog at the code freeze of release 3.2

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@NickDraper (2015-03-02T11:57:12):
Set to new at the end of Triage