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Peter Cottle
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171
arbor_src/tween/easing.js
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171
arbor_src/tween/easing.js
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//
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// easing.js
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// the world-famous penner easing equations
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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 © 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 modification,
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* 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 notice, this list of
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* conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* Neither the name of the author nor the names of contributors may be used to endorse
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* or promote products derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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var Easing = (function(){
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var that = {
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// t: current time, b: beginning value, c: change in value, d: duration
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linear: function(t, b, c, d){
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return c*(t/d) + b
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},
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quadin: function (t, b, c, d) {
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return c*(t/=d)*t + b;
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},
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quadout: function (t, b, c, d) {
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return -c *(t/=d)*(t-2) + b;
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},
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quadinout: function (t, b, c, d) {
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if ((t/=d/2) < 1) return c/2*t*t + b;
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return -c/2 * ((--t)*(t-2) - 1) + b;
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},
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cubicin: function (t, b, c, d) {
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return c*(t/=d)*t*t + b;
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},
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cubicout: function (t, b, c, d) {
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return c*((t=t/d-1)*t*t + 1) + b;
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},
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cubicinout: function (t, b, c, d) {
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if ((t/=d/2) < 1) return c/2*t*t*t + b;
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return c/2*((t-=2)*t*t + 2) + b;
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},
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quartin: function (t, b, c, d) {
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return c*(t/=d)*t*t*t + b;
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},
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quartout: function (t, b, c, d) {
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return -c * ((t=t/d-1)*t*t*t - 1) + b;
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},
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quartinout: function (t, b, c, d) {
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if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
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return -c/2 * ((t-=2)*t*t*t - 2) + b;
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},
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quintin: function (t, b, c, d) {
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return c*(t/=d)*t*t*t*t + b;
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},
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quintout: function (t, b, c, d) {
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return c*((t=t/d-1)*t*t*t*t + 1) + b;
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},
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quintinout: function (t, b, c, d) {
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if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
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return c/2*((t-=2)*t*t*t*t + 2) + b;
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},
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sinein: function (t, b, c, d) {
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return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
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},
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sineout: function (t, b, c, d) {
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return c * Math.sin(t/d * (Math.PI/2)) + b;
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},
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sineinout: function (t, b, c, d) {
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return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
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},
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expoin: function (t, b, c, d) {
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return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
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},
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expoout: function (t, b, c, d) {
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return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
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},
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expoinout: function (t, b, c, d) {
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if (t==0) return b;
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if (t==d) return b+c;
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if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
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return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
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},
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circin: function (t, b, c, d) {
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return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
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},
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circout: function (t, b, c, d) {
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return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
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},
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circinout: function (t, b, c, d) {
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if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
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return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
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},
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elasticin: function (t, b, c, d) {
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var s=1.70158;var p=0;var a=c;
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if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
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if (a < Math.abs(c)) { a=c; var s=p/4; }
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else var s = p/(2*Math.PI) * Math.asin (c/a);
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return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
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},
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elasticout: function (t, b, c, d) {
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var s=1.70158;var p=0;var a=c;
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if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
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if (a < Math.abs(c)) { a=c; var s=p/4; }
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else var s = p/(2*Math.PI) * Math.asin (c/a);
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return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
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},
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elasticinout: function (t, b, c, d) {
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var s=1.70158;var p=0;var a=c;
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if (t==0) return b; if ((t/=d/2)==2) return b+c; if (!p) p=d*(.3*1.5);
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if (a < Math.abs(c)) { a=c; var s=p/4; }
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else var s = p/(2*Math.PI) * Math.asin (c/a);
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if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
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return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
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},
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backin: function (t, b, c, d, s) {
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if (s == undefined) s = 1.70158;
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return c*(t/=d)*t*((s+1)*t - s) + b;
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},
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backout: function (t, b, c, d, s) {
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if (s == undefined) s = 1.70158;
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return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
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},
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backinout: function (t, b, c, d, s) {
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if (s == undefined) s = 1.70158;
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if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
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return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
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},
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bouncein: function (t, b, c, d) {
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return c - that.bounceOut (d-t, 0, c, d) + b;
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},
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bounceout: function (t, b, c, d) {
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if ((t/=d) < (1/2.75)) {
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return c*(7.5625*t*t) + b;
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} else if (t < (2/2.75)) {
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return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
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} else if (t < (2.5/2.75)) {
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return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
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} else {
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return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
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}
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},
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bounceinout: function (t, b, c, d) {
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if (t < d/2) return that.bounceIn (t*2, 0, c, d) * .5 + b;
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return that.bounceOut(t*2-d, 0, c, d) * .5 + c*.5 + b;
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}
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}
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return that
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})()
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