Behold, Nenya, Ring of Water and repository for our media and animation related

goodies, both Java 2D and LWJGL/JME 3D.


git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@1 ed5b42cb-e716-0410-a449-f6a68f950b19

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

@@ -0,0 +1,143 @@
+//
+// $Id: PathSequence.java 4191 2006-06-13 22:42:20Z ray $
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
+// http://www.threerings.net/code/narya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.threerings.media.util;
+
+import java.awt.Graphics2D;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.threerings.media.Log;
+
+/**
+ * Used to create a path that is a sequence of several other paths.
+ */
+public class PathSequence
+    implements Path
+{
+    /**
+     * Conveniently construct a path sequence with the two specified
+     * paths.
+     */
+    public PathSequence (Path first, Path second)
+    {
+        this(new ArrayList());
+        _paths.add(first);
+        _paths.add(second);
+    }
+
+    /**
+     * Construct a path sequence with the list of paths.
+     * Note: Paths may be added to the end of the list while
+     * the pathable is still traversing earlier paths!
+     */
+    public PathSequence (List paths)
+    {
+        _paths = paths;
+    }
+
+    // documentation inherited from interface Path
+    public void init (Pathable pable, long tickStamp)
+    {
+        _pable = pable;
+        _pableRep = new DelegatingPathable(_pable) {
+            public void pathCompleted (long timeStamp) {
+                long initStamp;
+                // if we just finished a timed path, we can figure out how
+                // long ago it really finished and init the next path at
+                // that time in the past.
+                if (_curPath instanceof TimedPath) {
+                    initStamp = _lastInit + ((TimedPath) _curPath)._duration;
+                } else {
+                    // we don't know
+                    initStamp = timeStamp;
+                }
+                initNextPath(initStamp, timeStamp);
+            }
+        };
+        initNextPath(tickStamp, tickStamp);
+    }
+
+    // documentation inherited from interface Path
+    public boolean tick (Pathable pable, long tickStamp)
+    {
+        if (pable != _pable) {
+            Log.warning("PathSequence ticked with different path than " +
+                "it was inited with.");
+        }
+        return _curPath.tick(_pableRep, tickStamp);
+    }
+
+    // documentation inherited from interface Path
+    public void fastForward (long timeDelta)
+    {
+        _lastInit += timeDelta;
+        _curPath.fastForward(timeDelta);
+    }
+
+    // documentation inherited from interface Path
+    public void paint (Graphics2D gfx)
+    {
+        // for now..
+        _curPath.paint(gfx);
+    }
+
+    // documentation inherited from interface Path
+    public void wasRemoved (Pathable pable)
+    {
+        if (_curPath != null) {
+            _curPath.wasRemoved(_pableRep);
+        }
+    }
+
+    /**
+     * Initialize and start the next path in the sequence.
+     */
+    protected void initNextPath (long initStamp, long tickStamp)
+    {
+        if (_paths.size() == 0) {
+            _pable.pathCompleted(tickStamp);
+
+        } else {
+            _curPath = (Path) _paths.remove(0);
+            _lastInit = initStamp;
+
+            _curPath.init(_pableRep, initStamp);
+            _curPath.tick(_pableRep, tickStamp);
+        }
+    }
+
+    /** The list of paths. */
+    protected List _paths;
+
+    /** The timestamp at which we last inited a path. */
+    protected long _lastInit;
+
+    /** The current path we're pathing. */
+    protected Path _curPath;
+
+    /** The pathable we're duping bigtime. */
+    protected Pathable _pable;
+
+    /** A fake pathable that we pass to the subpaths. */
+    protected Pathable _pableRep;
+}