[Kst] [Bug 86915] ability to operate only on what is visible shown in plot

[George Staikos]

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http://bugs.kde.org/show_bug.cgi?id=86915         




------- Additional Comments From staikos kde org  2007-03-15 00:02 -------
On 14-Mar-07, at 6:55 PM, Andrew Walker wrote:
> ------- Additional Comments From arwalker sumusltd com  2007-03-14  
> 23:55 -------
> Perhaps before we start discussing implementation details we could  
> decide on the functionality. To get things rolling the LFI team  
> needs to see something like the following:
>
> * for every curve in every plot there will be created two vectors  
> which give the x,y values of all the points contained within the  
> plot boundaries.
> * these two vectors will always be of the same length.
> * these vectors will automatically update when the view of the data  
> is modified (e.g. the user pans, zooms in, zooms out, etc.)
> * these vectors will, like other vectors, automatically create and  
> update associated scalar values (giving values such as mean, std  
> dev, min, max, etc.)
> * in the interests of preserving memory the user will have the  
> ability to switch off or on sub-vector generation on a curve by  
> curve basis. The default setting will be sticky.
> * the names of the sub-vectors will be such that they are uniquely  
> identified and each sub-vector name will contain the name of each  
> of the parent vector, the curve of which it is part, and the plot  
> within which the curve is found.


    Those also sound like implementation details...  what is it that  
they want to do?

    In any case having a VectorView is something that logically makes  
sense and will allow for the implementation of features like the ones  
I think you are saying are wanted.

--
George Staikos
KDE Developer				http://www.kde.org/
Staikos Computing Services Inc.		http://www.staikos.net/