Added support for associating an action with any of the object tiles in

the scene. This will eventually be interpreted by the scene rendering code
to allow objects to be clickable.

Also rewrote scene serialization code using new Java buffer services which
are much more efficient at reading and writing arrays of integers.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@894 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/miso/client/DisplayMisoSceneImpl.java

@@ -1,8 +1,11 @@
 //
-// $Id: DisplayMisoSceneImpl.java,v 1.48 2001/12/05 07:29:06 mdb Exp $
+// $Id: DisplayMisoSceneImpl.java,v 1.49 2002/01/30 18:28:32 mdb Exp $
 
 package com.threerings.miso.scene;
 
+import com.samskivert.util.HashIntMap;
+import com.samskivert.util.StringUtil;
+
 import com.threerings.media.tile.NoSuchTileException;
 import com.threerings.media.tile.NoSuchTileSetException;
 import com.threerings.media.tile.ObjectTile;
@@ -73,6 +76,19 @@ public class DisplayMisoSceneImpl
         _base = new BaseTileLayer(new BaseTile[swid*shei], swid, shei);
         _fringe = new TileLayer(new Tile[swid*shei], swid, shei);
         _object = new ObjectTileLayer(new ObjectTile[swid*shei], swid, shei);
+
+        // create a mapping for the action strings and populate it
+        _actions = new HashIntMap();
+        for (int i = 0; i < model.objectActions.length; i++) {
+            String action = model.objectActions[i];
+            // skip null or blank actions
+            if (StringUtil.blank(action)) {
+                continue;
+            }
+            // the key is the composite of the column and row
+            _actions.put(objectKey(model.objectTileIds[3*i],
+                                   model.objectTileIds[3*i+1]), action);
+        }
     }
 
     /**
@@ -175,6 +191,16 @@ public class DisplayMisoSceneImpl
         return _object;
     }
 
+    // documentation inherited from interface
+    public String getObjectAction (int column, int row)
+    {
+        if (_actions != null) {
+            return (String)_actions.get(objectKey(column, row));
+        } else {
+            return null;
+        }
+    }
+
     /**
      * Return a string representation of this Miso scene object.
      */
@@ -211,6 +237,15 @@ public class DisplayMisoSceneImpl
         // ", sy=" + y + ", ex=" + endx + ", ey=" + endy + "].");
     }
 
+    /**
+     * Computes the action table key for the object at the specified
+     * column and row.
+     */
+    protected static int objectKey (int column, int row)
+    {
+        return (column << 15) + row;
+    }
+
     /** The tile manager from which we load tiles. */
     protected TileManager _tmgr;
 
@@ -225,4 +260,7 @@ public class DisplayMisoSceneImpl
 
     /** The object layer of tiles. */
     protected ObjectTileLayer _object;
+
+    /** A map from object tile coordinates to action string. */
+    protected HashIntMap _actions;
 }