Added the ability to specify one portal in a scene as the "default

entrance."  The default entrance is specially highlighted in the scene
and can be read from and written to XML scene description files.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@558 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/miso/tools/xml/XMLSceneWriter.java

@@ -1,5 +1,5 @@
 //
-// $Id: XMLSceneWriter.java,v 1.17 2001/10/22 18:21:42 shaper Exp $
+// $Id: XMLSceneWriter.java,v 1.18 2001/10/25 16:36:43 shaper Exp $
 
 package com.threerings.miso.scene.xml;
 
@@ -62,6 +62,8 @@ public class XMLSceneWriter extends DataWriter
 
             dataElement("portals", getPortalData(scene));
 
+            dataElement("entrance", getEntranceData(scene));
+
             startElement("tiles");
             for (int lnum = 0; lnum < MisoScene.NUM_LAYERS; lnum++) {
                 writeLayer(scene, lnum);
@@ -189,6 +191,23 @@ public class XMLSceneWriter extends DataWriter
         return buf.toString();
     }
 
+    /**
+     * Returns a string detailing the location index of the default
+     * entrance portal for the scene, or <code>"-1"</code> if no
+     * default portal is specified or an error occurs.
+     */
+    protected String getEntranceData (MisoScene scene)
+    {
+        List locs = scene.getLocations();
+        Portal entrance = scene.getEntrance();
+
+        if (locs.size() == 0 || entrance == null) {
+            return "-1";
+        }
+
+        return String.valueOf(locs.indexOf(entrance));
+    }
+
     /**
      * Return a string representation of the tiles at the specified
      * row and layer in the given scene.  Only <code>len</code> tiles