Changes between Version 18 and Version 19 of SettingZoomLevels

Timestamp:

07/01/09 09:54:16 (4 years ago)

Author:

tmcw

Comment:

Documenting serverResolutions and TMS layers

SettingZoomLevels

@@ -240 +240 @@
 }}}
 
-
-
+== TMS Layers ==
+
+Setting the resolutions array in the traditional manner does not work with TMS layers by design. Instead of removing values from the resolutions array to restrict zoom levels (for unrendered TMS layers or other reasons), include both a serverResolutions array and a resolutions array. The serverResolutions array should include all resolutions available (whether rendered or not) on the  server, while the resolutions array should have all resolutions that are ''presented to the user'' - therefore the resolutions array should be a ''subset'' of serverResolutions. For instance,
+
+{{{
+resolutions: [0.17578125, 0.087890625, 0.0439453125],
+serverResolutions: [0.703125, 0.3515625, 0.17578125, 0.087890625, 0.0439453125],
+}}}
 
 ''Note: Some users may have noticed the existence of 'MIN_ZOOM_LEVELS' and 'MAX_ZOOM_LEVELS' properties as defined on the 3rd party layers. These are '''constant''' values and should not be modified. They are set by the creators of the 3rd party layers to specify to the !FixedZoomLevels class the specifics of setting up their resolutions arrays. I repeat: these should *not* be modified by users: use instead the three options as explained above ('minZoomLevel', 'maxZoomLevel', and 'numZoomLevels')'''