Keep zoom level and bounds between pages

git-svn-id: http://www.peacefrogs.net/svn/chimere/trunk@13 9215b0d5-fb2c-4bbd-8d3e-bd2e9090e864

3 files changed, 40 insertions, 4 deletions

diff --git a/static/base.js b/static/base.js
new file mode 100644
index 0000000..19b3945
--- /dev/null
+++ b/static/base.js
@@ -0,0 +1,32 @@
+
+function saveExtent() {
+    /* save the current extent in a cookie */
+    if(!map) return;
+    document.cookie = "MAP_EXTENT=" + map.getExtent().toArray().join('_')
+                      + ';path="/"';
+}
+
+function getExtent() {
+    /* get the current extent from a cookie */
+    var cookies = document.cookie.split(';');
+    var map_extent;
+    for (i in cookies){
+        var items = cookies[i].split('=');
+        if (items[0] == 'MAP_EXTENT') map_extent = items[1].split('_');
+    }
+    return map_extent;
+}
+
+function zoomToCurrentExtent(map){
+    /* zoom to current extent */
+    var current_extent = getExtent();
+    if (OpenLayers && current_extent && current_extent.length == 4){
+        extent = new OpenLayers.Bounds(current_extent[0], current_extent[1],
+                                       current_extent[2], current_extent[3]);
+        map.zoomToExtent(extent, true);
+        return true;
+    }
+    else{
+        return;
+    }
+}
\ No newline at end of file
diff --git a/static/edit_map.js b/static/edit_map.js
index 6aedc73..fa13dbb 100644
--- a/static/edit_map.js
+++ b/static/edit_map.js
@@ -58,7 +58,6 @@ function init(){
         controls:[new OpenLayers.Control.Navigation(),
                     new OpenLayers.Control.PanZoomBar(),
                     new OpenLayers.Control.Attribution()],
-        maxExtent: maxExtent,
         maxResolution: 156543.0399,
         units: 'm',
         projection: epsg_projection,
@@ -67,7 +66,10 @@ function init(){
     layerMarkers.setOpacity(0.5);
     map.addLayers([layerMapnik, layerMarkers]);
     map.events.register('click', map, setMarker);
-    map.setCenter(centerLonLat, 12);
+    /* zoom to the appropriate extent */
+    if (!zoomToCurrentExtent(map)){
+        map.setCenter(centerLonLat, 12);
+    }
 }
 
 
diff --git a/static/main_map.js b/static/main_map.js
index adb97c1..6370117 100644
--- a/static/main_map.js
+++ b/static/main_map.js
@@ -239,7 +239,6 @@ function init(){
         controls:[new OpenLayers.Control.Navigation(),
                   new OpenLayers.Control.PanZoomBar(),
                   new OpenLayers.Control.ScaleLine()],
-        maxExtent: maxExtent,
         maxResolution: 156543.0399,
         units: 'm',
         projection: new OpenLayers.Projection('EPSG:4326')
@@ -247,6 +246,9 @@ function init(){
         /*projection: new OpenLayers.Projection('EPSG:900913'),
         displayProjection: new OpenLayers.Projection('EPSG:4326')*/
     map.addLayers([layerMapnik, cyclemap]);
+    /* zoom to the appropriate extent */
+    if (!zoomToCurrentExtent(map)){
+        map.setCenter(centerLonLat, 12);
+    }
     loadGeoObjects();
-    map.setCenter(centerLonLat, 12);
 }