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/******************************************************************************* |
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* Port of Robert Penner's easing equations for Nebula animation package. |
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* Copyright (c) 2008-2009 Nicolas Richeton. |
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* All rights reserved. This program and the accompanying materials |
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* are made available under the terms of the Eclipse Public License v1.0 |
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* which accompanies this distribution, and is available at |
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* http://www.eclipse.org/legal/epl-v10.html |
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* |
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*******************************************************************************/ |
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/********************************************************************************* |
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* TERMS OF USE - EASING EQUATIONS |
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* |
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* Open source under the BSD License. |
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* |
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* Copyright (c) 2001 Robert Penner |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* * Neither the name of the author nor the names of contributors may be |
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* used to endorse or promote products derived from this software without |
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* specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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********************************************************************************/ |
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package org.eclipse.nebula.animation.movement; |
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public class QuartInOut extends AbstractMovement { |
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public double getValue(double step) { |
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// Conversion from Robert Penner's action scripts |
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// |
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// t : time -> step |
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// b: min -> min |
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// c : total increment -> max - min |
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// d: duration -> duration |
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double c = max - min; |
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step = step / (duration / 2d); |
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if ((step) < 1d) |
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return c / 2d * step * step * step * step + min; |
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return -c / 2d * ((step -= 2d) * step * step * step - 2d) + min; |
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} |
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} |
