Changeset 990 for ZCO/branches/zco3

Timestamp:

10/13/07 09:47:42 (3 years ago)

Author:

jlivni

Message:

add zoom level limitation capabilities and some initial draft tilecache options

Location:

ZCO/branches/zco3/src/zco

Files:

• browser/session.py (modified) (1 diff)
• interfaces.py (modified) (1 diff)

ZCO/branches/zco3/src/zco/browser/session.py

@@ -114 +114 @@
         self.data['previousextent'] = self.extent.totuple()
 
-        # Assert that the zoom-in limit is not violated
-        if self.context.zoomInLimit > 0:
-            # Calculate the map scale for the requested extent
-            view = View(srs=createObject('zco.srs', self.context.spatialReferenceSystem),
-                                         bbox=extent.totuple(),
-                                         units=self.context.mapUnits)
-            scale = view.getscaledenominator(self.size)
-            if scale < self.context.zoomInLimit:
-                log.info('Map bound at scale 1:%s' % self.context.zoomInLimit)
-                v = view.getviewforscale(self.context.zoomInLimit, self.size)
-                extent = BoundingBox(v.ul.x, v.lr.y, v.lr.x, v.ul.y)
 
         # Assert that the maximum extent limit is not violated

ZCO/branches/zco3/src/zco/interfaces.py

@@ -290 +290 @@
         default=(-180.0, -90.0, 180.0, 90.0))
 
-    zoomInLimit = Int(
-        title=_("Zoom-in limit"),
+    zoomLevels = Int(
+        title=_("Zoom Levels"),
         description=_("Constrains the map user interface so that users "
-                      "are unable to zoom-in past a given map scale. "
-                      "The value expected here is a map scale denominator. "
-                      "For example, to limit the users at the scale of "
-                      "1:20000, enter the value 20000 here. Leave the "
-                      "field blank to disable the feature."),
+                      "are unable to zoom-in past this number of zoom levels. "
+                      "Level 0 refers to the max extent of the map, and each. "
+                      "additional level shows 4 times more detail. "
+                      "The default is 16.  As an example, Google Maps currently "
+                      "has approx 20 zoom levels, depending on the layer."),
         default=0,
         required=False)