(Optionally) set map center in web config, automagically pan there on map change.

configuration.txt

@@ -126,6 +126,10 @@ web:
     worlds:
       - title: World
         name: world
+        center:
+          x: 0
+          y: 64
+          z: 0
         maps:
           - type: FlatMapType
             title: Flat
@@ -145,6 +149,10 @@ web:
             prefix: ct
       - title: Nether
         name: nether
+        center:
+          x: 0
+          y: 64
+          z: 0
         maps:
           - type: FlatMapType
             title: Flat

web/js/map.js

@@ -316,6 +316,11 @@ DynMap.prototype = {
 			if (worldChanged) {
 				$(me).trigger('worldchanged');
 			}
+			if (map.world.center) {
+				me.map.panTo(map.projection.fromWorldToLatLng(map.world.center.x||0,map.world.center.y||0,map.world.center.z||0));
+			} else {
+				me.map.panTo(map.projection.fromWorldToLatLng(0,64,0));
+			}
 			$(me).trigger('mapchanged');
 			if (completed) {
 				completed();