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Adding a zoomOffset property to XYZ and TMS layers. This allows you to have a map with a maximum resolution that differs from the maximum cache resolution (if you want to show a subset of OSM for example). r=ahocevar (closes #2616)

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@10650 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
Tim Schaub
2010-08-20 19:40:53 +00:00
parent 5750b5f6e0
commit 59953b8eb6
6 changed files with 192 additions and 2 deletions
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16
lib/OpenLayers/Layer/TMS.js
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@@ -41,6 +41,20 @@ OpenLayers.Layer.TMS = OpenLayers.Class(OpenLayers.Layer.Grid, {
*/
serverResolutions: null,
/**
* APIProperty: zoomOffset
* {Number} If your cache has more zoom levels than you want to provide
* access to with this layer, supply a zoomOffset. This zoom offset
* is added to the current map zoom level to determine the level
* for a requested tile. For example, if you supply a zoomOffset
* of 3, when the map is at the zoom 0, tiles will be requested from
* level 3 of your cache. Default is 0 (assumes cache level and map
* zoom are equivalent). Using <zoomOffset> is an alternative to
* setting <serverResolutions> if you only want to expose a subset
* of the server resolutions.
*/
zoomOffset: 0,
/**
* Constructor: OpenLayers.Layer.TMS
*
@@ -107,7 +121,7 @@ OpenLayers.Layer.TMS = OpenLayers.Class(OpenLayers.Layer.Grid, {
var y = Math.round((bounds.bottom - this.tileOrigin.lat) / (res * this.tileSize.h));
var z = this.serverResolutions != null ?
OpenLayers.Util.indexOf(this.serverResolutions, res) :
this.map.getZoom();
this.map.getZoom() + this.zoomOffset;
var path = this.serviceVersion + "/" + this.layername + "/" + z + "/" + x + "/" + y + "." + this.type;
var url = this.url;
if (url instanceof Array) {