Snippets of OpenLayers.Layer.TMS Offline

gistfile1.txt

tmsLayer = new OpenLayers.Layer.TMS(lay.name,
'Content/outputs/', {
                type: 'png',
                alpha: true,
                serviceVersion: '',
                layername: 'Magnetics',
                tileExtent: new OpenLayers.Bounds(lay.imageBounds.left,
lay.imageBounds.bottom, lay.imageBounds.right,
lay.imageBounds.top).transform(dproj, proj),
                mapMinZoom: lay.imageMinZoom,
                mapMaxZoom: lay.imageMaxZoom,
                getURL: tms_getTileURL,
                displayOutsideMaxExtent: true,
                zoomOffset: 0,
                isBaseLayer: lay.baselayer
            });

# the getURL to use is:

function tms_getTileURL(bounds) {
    adjustBounds(bounds, this.maxExtent);
    var res = this.map.getResolution();
    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));
    var z = this.map.getZoom();
    z = this.serverResolutions != null ?
OpenLayers.Util.indexOf(this.serverResolutions, res) : z + 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 && z <=
this.mapMaxZoom) {
            return this.url + this.serviceVersion + "/" +
this.layername + "/" + z + "/" + x + "/" + y + "." + this.type;
        } else {
            return "images/none.png";
        }
    } else {
        if (this.tileExtent.intersectsBounds(bounds) && z >=
this.mapMinZoom && z <= this.mapMaxZoom) {
            return this.url + this.serviceVersion + "/" +
this.layername + "/" + z + "/" + x + "/" + y + "." + this.type;
        } else {
            return "images/none.png";
        }
    }
}

####################################
new OpenLayers.Layer.TMS(lay.name,
              'openlayers/', {
               type: 'png',
               alpha: true,
               serviceVersion: '',
               layername: 'naturalearth',
               tileExtent: new OpenLayers.Bounds(lay.imageBounds.left,
               lay.imageBounds.bottom, lay.imageBounds.right,
               lay.imageBounds.top).transform(gg, sm),
               mapMinZoom: lay.imageMinZoom,
               mapMaxZoom: lay.imageMaxZoom,
               getURL: tms_getTileURL,
               displayOutsideMaxExtent: true,
               zoomOffset: 0,
               isBaseLayer: lay.baselayer
           }),

       new OpenLayers.Layer.TMS("MapBox Tile Natural Earth 2",
'http://a.tiles.mapbox.com/mapbox/',
           {layername: 'natural-earth-2',
            type: 'png',
            transitionEffect: 'resize'
            }),

#################################################

tmsLayer = new OpenLayers.Layer.TMS(lay.name,
'Content/outputs/', {
                type: 'png',
                alpha: true,
                serviceVersion: '',
                layername: 'Magnetics',
                tileExtent: new OpenLayers.Bounds(lay.imageBounds.left,
lay.imageBounds.bottom, lay.imageBounds.right,
lay.imageBounds.top).transform(dproj, proj),
                mapMinZoom: lay.imageMinZoom,
                mapMaxZoom: lay.imageMaxZoom,
                getURL: tms_getTileURL,
                displayOutsideMaxExtent: true,
                zoomOffset: 0,
                isBaseLayer: lay.baselayer
            });

#the getURL to use is:

function tms_getTileURL(bounds) {
    adjustBounds(bounds, this.maxExtent);
    var res = this.map.getResolution();
    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));
    var z = this.map.getZoom();
    z = this.serverResolutions != null ?
OpenLayers.Util.indexOf(this.serverResolutions, res) : z + 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 && z <=
this.mapMaxZoom) {
            return this.url + this.serviceVersion + "/" +
this.layername + "/" + z + "/" + x + "/" + y + "." + this.type;
        } else {
            return "images/none.png";
        }
    } else {
        if (this.tileExtent.intersectsBounds(bounds) && z >=
this.mapMinZoom && z <= this.mapMaxZoom) {
            return this.url + this.serviceVersion + "/" +
this.layername + "/" + z + "/" + x + "/" + y + "." + this.type;
        } else {
            return "images/none.png";
        }
    }
}