[OpenLayers-Dev] Fractional Zoom with Grid layers - Artifacts

[James Lamanna]

I realized that this is the wrong approach.
However, it seems that increasing the width and height of a tile to 
257%/257% (in the case of an XYZ layer), appears to make the artifacts 
go away. I'll spend some time trying to find a reasonable approach 
across all browsers and layer types.

-- James

On 8/3/2012 10:04 AM, James Lamanna wrote:
> Hi,
> I'm working on an application that requires that there be fractional
> zoom capability for almost all layers.
> I've been working with some XYZ layers with fractionalZoom (by setting
> serverResolutions), however, I noticed that there are nasty white
> grid-line artifacts that show up when on non integral zoom levels.
>
> Upon reviewing what is going on, the artifacts are generated as a result
> of scaling the layer <div>. I believe that this approach should be
> changed to scale the tile images, rather than the layer div.
>
> So, transformDiv() would have code in it like this:
>
> transformDiv: function(scale) {
> $(this.div).find('img').css('width',
> function(i,v){ return v * scale; });
> $(this.div).find('img').css('height',
> function(i,v) { return v * scale; });
> $(this.div).find('img').css('left',
> function(i, v) { return v * scale; });
> $(this.div).find('img').css('top',
> function(i, v) { return v * scale; });
>
> ....
>
> This appears to remove the tile artifacts.
>
> Thanks.
>
> -- James