fix size initialization and resolution/zoom usage

[dregade]

clone member function tries to clone a non initialized member variable: size. Add size initialization.

must use serverResolutions if provided instead of zoom/resolution directly provided to functions.

[ahocevar]

For this to be immediately useful, it would be nice if the serverResolutions could be calculated automatically. I'm envisioning something like this, but I'm not sure if this does the right thing in all cases:

@@ -135,12 +135,17 @@ OpenLayers.Layer.Zoomify = OpenLayers.Class(OpenLayers.Lay
         this.numberOfTiers = this.tierSizeInTiles.length;

         this.tileCountUpToTier = [0];
+        var resolutions = [1];
         for (var i = 1; i < this.numberOfTiers; i++) {
+            resolutions.unshift(Math.pow(2, i));
             this.tileCountUpToTier.push(
                 this.tierSizeInTiles[i-1].w * this.tierSizeInTiles[i-1].h +
                 this.tileCountUpToTier[i-1]
                 );
         }
+        if (!this.serverResolutions) {
+            this.serverResolutions = resolutions;
+        }
     },

     /**

[dregade]

I applied your patch. I looked for cases that may discard this patch but I didn't found any special case.

[ahocevar]

Thanks @dregade. This looks great now. Have you contributed before? If not, can you please send a CLA? See http://trac.osgeo.org/openlayers/wiki/HowToContribute#ContributorsLicenseAgreements. Please comment here when you have sent the CLA, so we can merge the pull request.

[dregade]

I sent the cla to openlayers-cla_at_lists_dot_osgeo_dot_org

[tschaub]

CLA received. Thanks @dregade.