[Kst] Prune data to visible range

[Brisset, Nicolas]

Hi,

As already mentioned in the past on this list, I think it is currently a bit too cumbersome to reduce vector ranges. We also had quite a few user requests which went in that direction. So I'd like that to improve :)

I see 2 ways:

1.       Arrange for the change data sample ranges tool to allow entering ranges more efficiently than by means of numbers (e.g. using time or date/time, which I think more or less exists but I can't get it to work)

2.       Adding a tool to prune vectors according to the range of a given vector (typically time). We could for instance integrate it in the "Change Data Sample Ranges" tool, and it would principally do the following:

§  Check all tabs/plots/curves using the selected vector(s) to determine the min and max frames displayed, assuming the vector(s) is(are) monotonous

§  Set the ranges of all visible vectors (i.e. vectors used in at least one curve) to the previously determined min and max frame range

Considering that Kst can display pretty much anything as a function of something else, the previous description is a bit abstract. But if you consider the very usual case of displaying vectors from a time series, it would be very easy to use as it is much easier to determine an interesting range visually than over frame ranges. Concretely, you would zoom into the interesting range on one f(t) plot, go to the range tool, select the time vector and hit a button, and everything would be settled.

The only thing is that I'm not too much into the plotting part of Kst, so I'd appreciate some guidance  on how to go about it (especially how to efficiently iterate over plots and get the min and max frame numbers or values of a given vector)

Thanks for your help,

Nicolas

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