1/* 2 * Copyright (C) 2001 Robert Penner. All rights reserved. 3 * Copyright (C) 2013 Samsung Electronics. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the author nor the names of contributors may be 14 * used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS"AS IS" 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 21 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30/* 31 * Robert Penner's easing equations. http://www.robertpenner.com/easing/ 32 * static function easeInOutQuad (t:Number, b:Number, c:Number, d:Number):Number { 33 * if ((t/=d/2) < 1) return c/2*t*t + b; 34 * return -c/2 * ((--t)*(t-2) - 1) + b; 35 * } 36 */ 37namespace WebKit { 38 39float easeInOutQuad(float time, const float base, const float constant, const unsigned duration) 40{ 41 if (time > duration || time < 0) 42 return 0; 43 44 if ((time /= (duration / 2)) < 1) 45 return (constant / 2) * time * time + base; 46 47 time -= 1; 48 return -1 * (constant / 2) * (time * (time - 2) - 1) + base; 49} 50 51} // namespace WebKit 52