[Kst] [Bug 93638] Curves derived from psds, histograms, and equations are not updated when source is changed

George Staikos staikos at kde.org
Tue Nov 23 00:28:36 CET 2004

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------- Additional Comments From staikos kde org  2004-11-23 00:28 -------
On Monday 22 November 2004 18:22, Andrew Walker wrote:
> ------- I'm not clear on how there could be multiple curves.
> When you create a histogram it creates a histogram
> and a curve. The histogram could contain a reference to
> the curve. How could it have multiple curves?
> I think we need a fix for this for 1.0. Given your fix
> won't be ready by then what would you suggest?

  Historgrams, equations and PSDs are all data objects.  They produce slave 
vectors, not curves.  There is an accelerator in the dialogs to automatically 
create a curve from the object.  There is also a 'hint' so that the user can 
quickly create another such curve from the object.  The user could even 
right-click on a slave vector and do "Make curve".  Equations could use the 
derived vectors.  Other objects could even do so.  The problem is more 
fundamental, and putting in a hack for one curve is not going to solve it.

   I noticed this in Paris and started working on it, but it's very 
complicated to get right.  We don't want to have unnecessary updates (this 
happened at least twice in the past year and a half).  That causes major 
performance issues.  My only suggestion right now is to extend that patch 
since it's the right fix, but I also suggest that we ship 1.0 without it and 
do 1.0.1 later with this fix.  Or we delay 1.0 for another full week at 

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