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, -- Christopher Schmidt MetaCarta _______________________________________________ Dev mailing list Dev@openlayers.org http://openlayers.org/mailman/listinfo/dev
