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List:       koffice-devel
Subject:    Re: API enhancement: Selecting area to chart in a KSpread sheet.
From:       Robert Knight <robertknight () gmail ! com>
Date:       2005-11-15 1:31:53
Message-ID: 13ed09c00511141731h13869d03p () mail ! gmail ! com
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Hi Karl,

> Porting KChart to the new KD Chart code will be done within the next days,
> so we can very soon try how this windowing would work.

Does KD Chart support multi-coordinate data?  KChart doesn't have any
facilities for plotting scatter graphs at the moment (ie a set of
points each with an X and a Y coordinate, joined together by a trend
line), that would be very useful, and was one of the things requested
by users in response to Inge's recent KDE Dot article.



On 11/14/05, Karl-Heinz Zimmer <khz@ngi.de> wrote:
> Hi Inge,
>
> I am not absolutely sure if I am correctly understanding what you want to
> achieve, so please help me to get this right:
>
> Do you want to be able to change the selection (the one inside KSpread)
> from inside the configuration dialog of KChart?
>
> I have no clue if that can be done (do not know the KOffice code good
> enough).
>
> On the other hand there is something that /can/ be done quite easily:
>
> The newest version of the KD Chart 1.x branch is not providing built-in
> zooming/panning, but it is explicitely 'supporting' zooming and panning of
> the data part to be visualized: The calling application would subclass
> from the base class of our data class and could overwrite some methods
> following a schema that is documented by us.
>
> So the calling application (that is KChart) could use this simple technic
> to specify kind of a 'window' onto the big data area - and it could move
> this window around, requiring no more than a simple repaint to make the KD
> Chart engine use the new data range.
>
> Using this new technic we even also get of the need of copying the KSpread
> cell data around, since the data storage sub-classed from KD Chart's class
> does not necessarily need to have the data stored inside - it just has to
> know how deliver them when is it asked for a cell's data ...
>
> Porting KChart to the new KD Chart code will be done within the next days,
> so we can very soon try how this windowing would work.
>
> As I wrote about, the thing I have no clue about is, how we could
> propagate to KSpread that the data range has been changed from inside the
> KChart configuration, so perhaps someone else could dig into this feedback
> detail and come up with a nice solution?  :-)
>
> Cheers,
> Karl-Heinz
>
> On So, 13.11.2005, 16:46, Inge Wallin sagte:
> > When the user creates a chart in KSpread, he (or she) starts by selecting
> > the
> > cells containing the data to be charted.  When the chart is created, this
> > data is copied (i.e. the values are copied) to the chart and is given to
> > the
> > chart through the API in koffice/interfaces/koChart.h.
> >
> > After the chart is created, this area can never be changed! The only way
> > to
> > "change" it, is to delete the chart, and create a new one with the new
> > area.
> > This is a real problem, so I want to fix it for 1.5.
> >
> > What I want to be able to do is (at least):
> >  - Insert rows or columns into the data area, and have the chart change
> on
> > it.
> >  - When configuring the embedded chart, I want to have a text entry with
> > the
> > caption "data area" or so, that I can enter things like "Sheet1.A1:C10"
> > and
> > have the chart updated if this area is changed.
> >
> > The second case is tricky, because it demands that the embedded document
> > (the
> > chart) can communicate data upwards to the embedding document (the
> > spreadsheet). The current API supports changing data area from the
> > spreadsheet (or whatever embedding program), but not the other way
> around.
> >
> > I have thought about this, but not been able to come up with anything
> > clean.
> > Can somebody else come up with something workable?
> >
> > 	-Inge
>
> --
> Karl-Heinz Zimmer, Senior Software Engineer, Klarälvdalens Datakonsult AB
> <mailto:khz@kdab.net>                                <mailto:khz@kde.org>
>
> ** Qt Components, Platform Independent Software, Qt Courses, Mentoring **
>
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