Changes between Version 2 and Version 3 of SettingZoomLevels

Timestamp:

08/18/06 23:34:52 (7 years ago)

Author:

euzuro

Comment:

--

SettingZoomLevels

@@ -58 +58 @@
  * '''Preset zoom levels''' - ''!ZoomLevels are determined by pre-set arrays of scale or resolution''
    * {{{scales}}} - The 'resolutions' array is filled with these scales, each directly converted to resolution.
+Example:
+{{{
+            var options = { scales: [50000000, 30000000, 10000000, 5000000] };
+            map = new OpenLayers.Map( $('map') , options);
+}}}
+
    * {{{resolutions}}} - The 'resolutions' array is taken directly from the options.
-
+Example:
+{{{
+            var options = { resolutions: [1.40625,0.703125,0.3515625,0.17578125,0.087890625,0.0439453125] };
+            map = new OpenLayers.Map( $('map') , options);
+}}}
  * '''Minimums and Maximums''' - ''!ZoomLevels are determined based on a maximum resolution and the number of desired !ZoomLevels''
    * Determining maxResolution
      * {{{minScale}}} - Resolution value is translated from scale using {{{units}}}
+Example: 
+{{{
+            var options = { minScale: 50000000 };
+            map = new OpenLayers.Map( $('map') , options);
+}}}
      * {{{maxExtent}}} AND {{{maxResolution == "auto"}}} - Resolution is calculated based on map's div size and the maxExtent property. If maxExtent is not specified, a default value is inherited from the map.
+Example:
+{{{
+            var options = { maxResolution: "auto",
+                            maxExtent: new OpenLayers.Bounds(-180, -90, 90, 180) };
+            map = new OpenLayers.Map( $('map') , options);
+}}}
      * {{{maxResolution}}} - Resolution value is taken directly from the value specified in the layer options. If no value specified, the default is taken from the map.
+Example:
+{{{
+            var options = { maxResolution: 0.17578125 };
+            map = new OpenLayers.Map( $('map') , options);
+}}}
    * Determining numZoomLevels
      * Calculated based on ratio of maxResolution to minResolution
        * Determining minResolution
          * {{{maxScale}}} - Resolution value is translated from scale using {{{units}}}
+Example:
+{{{
+            var options = { maxScale: 10000000 };
+            map = new OpenLayers.Map( $('map') , options);
+}}}
          * {{{minExtent}}} AND {{{minResolution == "auto"}}} - Resolution is calculated based on map's div size and the minExtent property. minExtent ''must be'' specified, as a default value is '''NOT''' inherited from the map.
+Example:
+{{{
+            var options = { minResolution: "auto",
+                            minExtent: new OpenLayers.Bounds(-1, -1, 1, 1) };
+            map = new OpenLayers.Map( $('map') , options);
+}}}
          * {{{minResolution}}} - Resolution value is taken directly from the value specified in the layer options. If no value specified, minResolutions remains null, and numZoomLevels is taken directly (below)
+Example:
+{{{
+            var options = { minResolution: 0.0439453125 };
+            map = new OpenLayers.Map( $('map') , options);
+}}}
      * {{{numZoomLevels}}} - numZoomLevels value is taken directly from the value specified in the layer options. If no value is specified, the default is taken from the map.
+Example:
+{{{
+            var options = { numZoomLevels: 5 };
+            map = new OpenLayers.Map( $('map') , options);
+}}}