[Kst] [Bug 300148] New: Fill area under curve

[david.mcminn at intelligentwellcontrols.com]

https://bugs.kde.org/show_bug.cgi?id=300148

            Bug ID: 300148
          Severity: wishlist
           Version: 2.0.5
          Priority: NOR
          Assignee: kst at kde.org
           Summary: Fill area under curve
    Classification: Unclassified
                OS: All
          Reporter: david.mcminn at intelligentwellcontrols.com
          Hardware: Other
            Status: UNCONFIRMED
         Component: plotting
           Product: kst

Created attachment 71145
  --> https://bugs.kde.org/attachment.cgi?id=71145&action=edit
Example sequence diagram

It would be nice if there was an option to fill the area under a curve (from
the curve line back towards zero), or between a minimum and maximum (for
example, fill between the error bars).

One example of a use for this is for displaying signal envelopes.

It could also be used to highlight areas of a plot along the X axis (a curve
with a square wave and fill could be used as the rearmost curve in order to
colour the background of more frontal line only curves). As an example see
attached "highlight_time_periods.png".

It could also be used to show category vs time (horizontal bars through time
for different categories or states, like a horizontal UML sequence diagram,
which is sometimes used in system pofiling, e.g.
http://www.qnx.com/developers/docs/6.3.0SP3/ide_en/user_guide/sysprof.html). As
an example, see attached "sequence.png".

I realise I can kind of achieve the same effect with barcharts but barcharts
have defined bars with edges whereas this would just be a floodfill. Barcharts
are also pretty slow when you have thousands of data samples.

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