Re: [Openev-discuss] Highlight vector data from layer dialog?

[Paul S. <pag...@ma...>]

While the rendering code doesn't handle it directly, you could set the 
_gv_ogrfs of a sub-selected shape to render it in a different colour. 
Per-shape settings of this are already handled by the rendering code, so 
for instance, if you are selecting points, you could set _gv_ogrfs for 
all selected points to SYMBOL(id:ogr-sym-0,c:#0000FFFF) and for the 
subselected point to SYMBOL(id:ogr-sym-0:c:#FF0000FF) which would turn 
all selected points into a blue cross symbol and the subselected one 
into a red cross.

To accomplish this, you would connect to the 'selection-changed' and 
'subselection-changed' signals I guess.

Frank, is the sub-selection stuff working?  I thought I read something 
about it not working or being broken or something?

Cheers,

Paul

Frank Warmerdam wrote:
> David J. Bakeman wrote:
> 
>> If I have more than one shape selected and I open the vector layer 
>> attributes dialog would it be possible to visually highlight the 
>> vector who's number is displayed?
> 
> 
> David,
> 
> I have wanted this a number of times, but currently the rendering code
> gives no special status to the "subselected" feature and I am not sure
> how to handle drawing it if it did.
> 
>> Also how difficult would it be to implement a search capability here. 
>> That is I selected a bunch of vectors on the gui now I want to filter 
>> out all that have a certain attribute either equal to or not equal to 
>> a certain value (or range :<)
> 
> 
> This is desirable.  It shouldn't be terribly hard.  Some of this work
> was already done in CIETmap though I am not sure how hard it would be
> to generalize.
> 
>> Finally how about allowing a change in the vector attributes dialog to 
>> propogate to all of the selected vectors?
> 
> 
> This is reasonable though it would complicate the GUI a bit.  In 
> particular,
> I think it would be desirable to apply a change to just one or a few out of
> the total attribute set to all selected vectors.  Currently all visible
> attributes are re-applied to the current vector everytime a change is
> detected.  It would be hard to know what things actually represent 
> changes to
> be applied to selected vectors.
> 
> However, the desire to do so is very reasonable.
> 
> Are you interested in implementing some of these options?
> 
> Best regards,

-- 
Paul Spencer
Applications and Software Development
DM Solutions Group Inc.
http://www.dmsolutions.ca