1 /* 2 3 dsh-interpolate Interpolation and easing functions. 4 Copyright (c) 2009-2013 held jointly by the individual authors. 5 6 This library is free software; you can redistribute it and/or modify it 7 under the terms of the GNU Lesser General Public License as published 8 by the Free Software Foundation; either version 3 of the License, or (at 9 your option) any later version. 10 11 This library is distributed in the hope that it will be useful, but WITHOUT 12 ANY WARRANTY; with out even the implied warranty of MERCHANTABILITY or 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 14 License for more details. 15 16 You should have received a copy of the GNU Lesser General Public License 17 along with this library; if not, write to the Free Software Foundation, 18 Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 19 20 > http://www.fsf.org/licensing/licenses/lgpl.html 21 > http://www.opensource.org/licenses/lgpl-license.php 22 23 */ 24 package org.dishevelled.interpolate; 25 26 /** 27 * Easing interpolation function. 28 * 29 * @author Michael Heuer 30 * @version $Revision$ $Date$ 31 */ 32 public interface EasingFunction 33 extends Interpolation 34 { 35 36 /** 37 * {@inheritDoc} 38 * 39 * <p> 40 * The typical interval for an interpolation function is <code>0.0d</code> to 41 * <code>1.0d</code>, inclusive. An easing interpolation function allows for 42 * overshooting this interval range in both directions, so the valid interval for 43 * returned values is <code>-1.0d</code> to <code>2.0d</code>, inclusive. 44 * </p> 45 */ 46 Double evaluate(Double value); 47 }