We need the ability to instruct the path *not* to scroll with the view

(useful when the path is actually operating in virtual coordinates which
are mapped to scrolled view coordinates by the pathable).


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1441 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/util/LinePath.java

@@ -1,5 +1,5 @@
 //
-// $Id: LinePath.java,v 1.6 2002/06/11 02:39:14 mdb Exp $
+// $Id: LinePath.java,v 1.7 2002/06/12 00:49:15 mdb Exp $
 
 package com.threerings.media.util;
 
@@ -46,12 +46,26 @@ public class LinePath implements Path
         _duration = duration;
     }
 
+    /**
+     * Instructs this path to adjust itself when the view scrolls, or not.
+     * If the path scrolls with the view, it will adjust its starting and
+     * ending positions by the amount scrolled by the view so that they
+     * remain fixed relative to the scrolled view. If it doesn't they will
+     * remain the same regardless of whether the view scrolls.
+     */
+    public void setScrollsWithView (boolean scrollsWithView)
+    {
+        _scrollsWithView = scrollsWithView;
+    }
+
     // documentation inherited from interface
     public void viewWillScroll (int dx, int dy)
     {
-        // adjust our source and destination points
-        _source.translate(-dx, -dy);
-        _dest.translate(-dx, -dy);
+        // adjust our source and dest points if we're tracking the view
+        if (_scrollsWithView) {
+            _source.translate(-dx, -dy);
+            _dest.translate(-dx, -dy);
+        }
     }
 
     // documentation inherited
@@ -139,4 +153,9 @@ public class LinePath implements Path
 
     /** The duration that we're to spend following the path. */
     protected long _duration;
+
+    /** Whether or not we scroll along with the view (which we accomplish
+     * by scrolling our start and end positions when the view scrolls) or
+     * if we should leave our coordinates alone. */
+    protected boolean _scrollsWithView = true;
 }