From 6d3f4c2465299a2ae0e052a142aeb2968186f087 Mon Sep 17 00:00:00 2001
From: Michael Bayne <mdb@threerings.net>
Date: Thu, 19 May 2005 00:21:28 +0000
Subject: [PATCH] Created LineSegmentPath fixed bug with path completion.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3567 542714f4-19e9-0310-aa3c-eee0fc999fb1
---
 .../jme/sprite/LineSegmentPath.java           | 82 +++++++++++++++++++
 .../com/threerings/jme/sprite/Sprite.java     |  1 +
 2 files changed, 83 insertions(+)
 create mode 100644 src/java/com/threerings/jme/sprite/LineSegmentPath.java

diff --git a/src/java/com/threerings/jme/sprite/LineSegmentPath.java b/src/java/com/threerings/jme/sprite/LineSegmentPath.java
new file mode 100644
index 000000000..b9e9305fa
--- /dev/null
+++ b/src/java/com/threerings/jme/sprite/LineSegmentPath.java
@@ -0,0 +1,82 @@
+//
+// $Id$
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2005 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.jme.sprite;
+
+import com.jme.math.Vector3f;
+
+/**
+ * Moves a sprite along a series of straight lines.
+ */
+public class LineSegmentPath extends Path
+{
+    /**
+     * Creates a path for the supplied sprite traversing the supplied
+     * series of points with the specified duration between points.
+     *
+     * @param points a list of points between which the sprite will be
+     * moved linearly (the sprite will be moved immediately to the first
+     * point).
+     * @param durations defines the elapsed time between each successive
+     * traversal. This will as a result be shorter by one element than the
+     * points array.
+     */
+    public LineSegmentPath (Sprite sprite, Vector3f[] points, float[] durations)
+    {
+        super(sprite);
+        _points = points;
+        _durations = durations;
+    }
+
+    // documentation inherited
+    public void update (float time)
+    {
+        // note the accumulated time
+        _accum += time;
+
+        // if we have surpassed the time for this segment, subtract the
+        // segment time and move on to the next segment
+        if (_accum > _durations[_current]) {
+            _accum -= _durations[_current];
+            _current++;
+        }
+
+        // if we have completed our path, move the sprite to the final
+        // position and wrap everything up
+        if (_current >= _durations.length) {
+            System.err.println("Finished!");
+            _sprite.setLocalTranslation(_points[_points.length-1]);
+            _sprite.pathCompleted();
+            return;
+        }
+
+        // move the sprite to the appropriate position between points
+        _temp.interpolate(_points[_current], _points[_current+1],
+                          _accum / _durations[_current]);
+        _sprite.setLocalTranslation(_temp);
+    }
+
+    protected Vector3f[] _points;
+    protected float[] _durations;
+    protected float _accum;
+    protected int _current;
+    protected Vector3f _temp = new Vector3f(0, 0, 0);
+}
diff --git a/src/java/com/threerings/jme/sprite/Sprite.java b/src/java/com/threerings/jme/sprite/Sprite.java
index de6791c92..e685f8f21 100644
--- a/src/java/com/threerings/jme/sprite/Sprite.java
+++ b/src/java/com/threerings/jme/sprite/Sprite.java
@@ -106,6 +106,7 @@ public class Sprite extends Node
     {
         Path oldpath = _path;
         _path = null;
+        removeController(oldpath);
         oldpath.wasRemoved();
         if (_observers != null) {
             _observers.apply(new CompletedOp(this, oldpath));