[OpenLayers-Dev] feature label enhancement

["Dominik Gärner"]

> I tried to do this at one point. Because OL ties a single SVG/VML object
> to a
> single geometry, it was hard to do right, so I gave up after spending a
> couple
> weekends on it.  Good luck. :)


Where were the problems? I think the label SVG/VML object is also tied to this geometry!?

Right now, I'm creating a textpath instead of the textbox element. I had no problems doing this with SVG, so far.
My problem is (as always -.-) doing the same thing for IE. For some reason the textpath in VML is not working... And for some other reason there is in OL a flipping of VML-objects around the y-axis...


Regards


> Datum: Mon, 15 Feb 2010 09:27:15 +0100
> Von: "Dominik Gärner" <domi-g at gmx.at>
> An: domi-g at gmx.at
> Betreff: Fwd: Re: [OpenLayers-Dev] feature label enhancement

> 
> 
> ------- Weitergeleitete Nachricht -------
> Von: "Christopher Schmidt" <crschmidt at metacarta.com>
> An: "Dominik Gärner" <domi-g at gmx.at>
> Kopie: dev at openlayers.org
> Betreff: Re: [OpenLayers-Dev] feature label enhancement
> Datum: Wed, 10 Feb 2010 14:11:22 +0100
> 
> On Wed, Feb 10, 2010 at 11:29:48AM +0100, "Dominik Gärner" wrote:
> > Hi everyone,
> >
> > I'd like to do some label enhancement for vector features. I want the  
> > label to follow the feature shape (e.g. see  
> > http://www.svgbasics.com/text2.html )
> > It shouldn't be that hard by using SVG & VML. However, since this means 
> > some changes in the Renderers - and I'm not so familiar with the whole  
> > existing implementations - I need some ideas & help for creating a  
> > concept:
> >
> > - using SVG, a textpath needs a <path> element. In SVG i could link the 
> > text to the path element (using the xlink:href attribute), but currently
>  
> > only Polygon and Curve geometries are using <path> node types. And I'm  
> > not sure if VML allows links.
> > The better way will be to create a separate path element for the  
> > text/label, using the feature's geometry (--> this means changes to the 
> > drawText methods in the Renderers)
> >
> > - maybe some additional style attributes for the label have to be added.
> >
> > - Who knows something about Canvas? Is it possible to implement curved  
> > text like in SVG & VML?
> >   Where or which component decides what to use (besides of IE->VML,  
> > Firefox->SVG)
> 
> I doubt it.
> 
> > - Rotating labels comes for free by rotating the vector feature. Does it
>  
> > make sense to create an extra Label/Text class for placing just labels  
> > (e.g. if I want to place just a text, not a feature with a label  
> > attribute)
> 
> No, because you can use a feature with no strokeWidth/strokeColor (an
> invisible
> feature) if you really want to do that.
> 
> > - Did I forget something essential? Sees anyone bigger blockades for the
>  
> > programming of this?
> 
> I tried to do this at one point. Because OL ties a single SVG/VML object
> to a
> single geometry, it was hard to do right, so I gave up after spending a
> couple
> weekends on it.  Good luck. :)
> 
> Regards,
> 
> 
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