Added objectFootprintsOverlap(). It's used by the editor, but IsoUtil

seemed like the right place for it.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@949 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/miso/client/util/IsoUtil.java

@@ -1,5 +1,5 @@
 //
-// $Id: IsoUtil.java,v 1.17 2001/12/18 08:38:57 mdb Exp $
+// $Id: IsoUtil.java,v 1.18 2002/02/06 23:34:17 mdb Exp $
 
 package com.threerings.miso.scene.util;
 
@@ -142,6 +142,19 @@ public class IsoUtil
         return boundsPoly;
     }
 
+    /**
+     * Returns true if the footprints of the two object tiles overlap when
+     * the objects occupy the specified coordinates, false if not.
+     */
+    public boolean objectFootprintsOverlap (ObjectTile tile1, int x1, int y1,
+                                            ObjectTile tile2, int x2, int y2)
+    {
+        return !(x2 > x1 - tile1.getBaseWidth() &&
+                 x1 > x2 - tile2.getBaseWidth() &&
+                 y2 > y1 - tile1.getBaseHeight() &&
+                 y1 > y2 - tile2.getBaseHeight());
+    }
+
     /**
      * Given two points in screen pixel coordinates, return the
      * compass direction that point B lies in from point A from an