Bobble paths now with extra smoothness

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3971 542714f4-19e9-0310-aa3c-eee0fc999fb1
2006-03-24 00:13:06 +00:00
parent b22dad2519
commit 70cb89d62d
1 changed files with 86 additions and 0 deletions
@@ -0,0 +1,86 @@
+//
+// $Id$
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2006 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 com.threerings.util.RandomUtil;
+
+/**
+ * Bobble a Pathable smoothly.
+ */
+public class SmoothBobblePath extends BobblePath
+{
+    public SmoothBobblePath (int dx, int dy, long duration)
+    {
+        this(dx, dy, duration, 1L);
+    }
+
+    public SmoothBobblePath (int dx, int dy, long duration, long updateFreq)
+    {
+        super(dx, dy, duration, updateFreq);
+    }
+
+    // documentation inherited
+    public void init (Pathable pable, long tickstamp)
+    {
+        super.init(pable, tickstamp);
+
+        _newx = _sx;
+        _newy = _sy;
+        _oldx = _sx;
+        _oldy = _sy;
+    }
+
+    // documentation inherited
+    public boolean tick (Pathable pable, long tickStamp)
+    {
+        // see if we need to stop
+        if (_stopTime <= tickStamp) {
+            boolean updated = updatePositionTo(pable, _sy, _sy);
+            pable.pathCompleted(tickStamp);
+            return updated;
+        }
+
+        // see if it's time to update the position
+        if (_nextMove < tickStamp) {
+            _oldx = _newx;
+            _oldy = _newy;
+            do {
+                _newx = _sx + RandomUtil.getInt(_dx * 2 + 1) - _dx;
+                _newy = _sy + RandomUtil.getInt(_dy * 2 + 1) - _dy;
+            } while (_newx == _oldx && _newy == _oldy);
+
+            _nextMove = tickStamp + _updateFreq;
+        }
+
+        float movePerc = (float)(_nextMove - tickStamp) / (float)_updateFreq;
+        int x = _oldx + (int)((_newx - _oldx) * movePerc);
+        int y = _oldy + (int)((_newy - _oldy) * movePerc);
+        // update the position
+        return updatePositionTo(pable, x, y);
+    }
+
+    /** The previous position. */
+    protected int _oldx, _oldy;
+
+    /** The next position. */
+    protected int _newx, _newy;
+}