diff --git a/src/as/com/threerings/flash/path/HermiteFunc.as b/src/as/com/threerings/flash/path/HermiteFunc.as new file mode 100644 index 00000000..f98251b6 --- /dev/null +++ b/src/as/com/threerings/flash/path/HermiteFunc.as @@ -0,0 +1,54 @@ +// +// $Id$ +// +// Nenya library - tools for developing networked games +// Copyright (C) 2002-2007 Three Rings Design, Inc., All Rights Reserved +// http://www.threerings.net/code/nenya/ +// +// 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.flash.path { + +/** + * Interpolates cubically between two values, with beginning and end derivates set + * to zero. TODO: Add support for specifying derivate values as well. + */ +public class HermiteFunc extends InterpFunc +{ + public function HermiteFunc (start :int, end :int) + { + _start = start; + _end = end; + } + + // from InterpFunc + override public function getValue (t :Number) :int + { + if (t >= 1) { + return _end; + } else if (t < 0) { // cope with a funny startOffset + return _start; + } else { + var h00 :Number = 2*t*t*t - 3*t*t + 1; + var h01 :Number = -2*t*t*t + 3*t*t; + + return int(_start * h00 + _end * h01); + } + } + + protected var _start :int; + protected var _end :int; +} +} diff --git a/src/as/com/threerings/flash/path/LinePath.as b/src/as/com/threerings/flash/path/LinePath.as index 2e187434..f3ebe7b6 100644 --- a/src/as/com/threerings/flash/path/LinePath.as +++ b/src/as/com/threerings/flash/path/LinePath.as @@ -6,7 +6,7 @@ package com.threerings.flash.path { import flash.display.DisplayObject; /** - * Moves a display object along a straight line path in a specified amount of time. + * Moves a display object along a line path in a specified amount of time. */ public class LinePath extends Path {