[OpenLayers-Dev] Deepzoom formatted tiles

[Phil Scadden]

 >Unfortunately, I cannot get openlayers to recognize this format (it 
has 1 px image in folder 0, then increases in size until e. g. folder 6 
starts with 256x256 tiles).

Create your layer as a TMS type. Override the getURL method and put in 
one of your own (I have never heard of libvips but presumably you know 
how to construct the relationship between a bounds and a tile).

Here is some code fragment that I used for a custom TMS.

function tms_getTileURL(bounds) {
     adjustBounds(bounds, this.maxExtent);
     var res = this.getServerResolution();
     var defImage = "images/none.png";
     var x = Math.round((bounds.left - this.maxExtent.left) / (res * 
this.tileSize.w));
     var y = Math.round((bounds.bottom - this.tileOrigin.lat) / (res * 
this.tileSize.h));
     z = this.serverResolutions != null ? 
OpenLayers.Util.indexOf(this.serverResolutions, res) : z + 
this.zoomOffset;*/
     var z = this.serverResolutions != null ?
     OpenLayers.Util.indexOf(this.serverResolutions, res) :
     this.getServerZoom() + this.zoomOffset;
     if (this.tileExtent.left > this.tileExtent.right) {
         var b1 = new OpenLayers.Bounds(this.tileExtent.left, 
this.tileExtent.bottom, this.map.maxExtent.right, this.tileExtent.top);
         var b2 = new OpenLayers.Bounds(this.map.maxExtent.left, 
this.tileExtent.bottom, this.tileExtent.right, this.tileExtent.top);
         if ((b1.intersectsBounds(bounds) || 
b2.intersectsBounds(bounds)) && z>= this.mapMinZoom ) {
             return this.url + this.serviceVersion + "/" + 
this.layername + "/" + z + "/" + x + "/" + y + "." + this.type;
         } else {
             return defImage;
         }
     } else {
         if (this.tileExtent.intersectsBounds(bounds) && z >= 
this.mapMinZoom ) {
             return this.url + this.serviceVersion + "/" + 
this.layername + "/" + z + "/" + x + "/" + y + "." + this.type;
         } else {
             return defImage;
         }
     }
}


I opened the layer as:
             layer = new OpenLayers.Layer.TMS(name, path, {
                 type: 'png',
                 alpha: true,
                 serviceVersion: '',
                 layername: layerName,
                 tileExtent: new OpenLayers.Bounds(imageBounds.left, 
imageBounds.bottom, imageBounds.right, imageBounds.top).transform(dproj, 
proj),
                 mapMinZoom: imageMinZoom,
                 mapMaxZoom: imageMaxZoom,
                 getURL: tms_getTileURL,
                 displayOutsideMaxExtent: false,
                 zoomOffset: 0,
                 serverResolutions:serverRes
             });


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