Re: Tweak for interactive SVGs?

[<pl...@pi...>]

James R. Van Zandt wrote:
> 
> Ethan A Merritt <merritt@u.washington.edu> writes:
>> On Saturday 27 December 2008, James R. Van Zandt wrote:
>>> I think these would be useful functions for a selected curve:
>>>  - Toggle visibility (as Bill demonstrated).
>>>  - Move to front/back.
>>>  - Dim (partially desaturate, or just turn light gray) / restore.  
>>>  - Highlight (move to front, and dim all the other curves) / restore.
>>>  - If X2 or Y2 axes are in use, then when you select a curve, it would
>>>    be nice to have the corresponding axes automatically highlighted.
>> What sort of user interface would this functionality use?
>>
>> Would it be possible to implement popup menus for all the interactive
>> terminals?  
>> svg - easy if you have already commited to using jscript or the like.
>> wxt - there is an extension that allow this, but it is very crude
>> x11 - not without pulling in some additional toolkit layer
>> win - no idea
>>
>> Or perhaps we could add a clickable icon to each key entry?
>> 1st click toggles off, 2nd click brings it back at dim/grey,
>> 3rd click highlights, 4th click returns it to the original state
> 
> I like this concept of cycling among the choices with clicks (though I
> think the first click should highlight).
> 
>>> I would also like a way to select a data point on the graph and
>>> display information about it.  In particular:
>>>
>>>  - The X, Y (Z, T, U, V) data value, with full precision (not
>>>    transformed to integer screen coordinates then transformed back).
>>>    Also DX and DY for errorbars graphs.
>>>
>>>  - Where it came from (file name, line, index, line within index,
>>>    etc.).  Useful for tracking down an outlier.
>>>
>>> If there are several data points very close together (say, within an
>>> eight pixel radius), I would like a way to cycle among them.
> 
> For drilling down to a particular data point, one could click at or
> near it.  The software would scan the data points until finding one
> within an N pixel radius, and pop up a window with data about that
> point.  For the next click it would restart its scan where it left off
> the last time, so all the nearby data points are eventually visited.
> 
>             - Jim Van Zandt
> 

Don't forget that we are talking about the graphical output of a
plotting program. This may be a function plot not data or a log plot or
a result of applying a function to the difference of two data series.

I dont think what you suggests has much meaning outside of a trivial x,y
plot of the input data and while svg has individual vectors for x,y data
 the bitmapped output do not.

I think the only thing that can have meaning here is cursor coordinates
displayed like the wxt terminal does. It would be nice to get that into
svg. A second best would be cross-hairs which help read the coords off
the axses without it having to calculate from the mouse. I don't think
what would be too hard to add.

Peter.