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All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name BernieCode nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ // Applies a sequence of numbers between 0 and 1 to a number of subjects // construct - see setOptions for parameters function Animator(options) { this.setOptions(options); var _this = this; this.timerDelegate = function(){_this.onTimerEvent()}; this.subjects = []; this.target = 0; this.state = 0; this.lastTime = null; }; Animator.prototype = { // apply defaults setOptions: function(options) { this.options = Animator.applyDefaults({ interval: 20, // time between animation frames duration: 400, // length of animation onComplete: function(){}, onStep: function(){}, transition: Animator.tx.easeInOut }, options); }, // animate from the current state to provided value seekTo: function(to) { this.seekFromTo(this.state, to); }, // animate from the current state to provided value seekFromTo: function(from, to) { this.target = Math.max(0, Math.min(1, to)); this.state = Math.max(0, Math.min(1, from)); this.lastTime = new Date().getTime(); if (!this.intervalId) { this.intervalId = window.setInterval(this.timerDelegate, this.options.interval); } }, // animate from the current state to provided value jumpTo: function(to) { this.target = this.state = Math.max(0, Math.min(1, to)); this.propagate(); }, // seek to the opposite of the current target toggle: function() { this.seekTo(1 - this.target); }, // add a function or an object with a method setState(state) that will be called with a number // between 0 and 1 on each frame of the animation addSubject: function(subject) { this.subjects[this.subjects.length] = subject; return this; }, // remove all subjects clearSubjects: function() { this.subjects = []; }, // forward the current state to the animation subjects propagate: function() { var value = this.options.transition(this.state); for (var i=0; i<this.subjects.length; i++) { if (this.subjects[i].setState) { this.subjects[i].setState(value); } else { this.subjects[i](value); } } }, // called once per frame to update the current state onTimerEvent: function() { var now = new Date().getTime(); var timePassed = now - this.lastTime; this.lastTime = now; var movement = (timePassed / this.options.duration) * (this.state < this.target ? 1 : -1); if (Math.abs(movement) >= Math.abs(this.state - this.target)) { this.state = this.target; } else { this.state += movement; } try { this.propagate(); } finally { this.options.onStep.call(this); if (this.target == this.state) { window.clearInterval(this.intervalId); this.intervalId = null; this.options.onComplete.call(this); } } }, // shortcuts play: function() {this.seekFromTo(0, 1)}, reverse: function() {this.seekFromTo(1, 0)}, // return a string describing this Animator, for debugging inspect: function() { var str = "#<Animator:\n"; for (var i=0; i<this.subjects.length; i++) { str += this.subjects[i].inspect(); } str += ">"; return str; } } // merge the properties of two objects Animator.applyDefaults = function(defaults, prefs) { prefs = prefs || {}; var prop, result = {}; for (prop in defaults) result[prop] = prefs[prop] !== undefined ? prefs[prop] : defaults[prop]; return result; } // make an array from any object Animator.makeArray = function(o) { if (o == null) return []; if (!o.length) return [o]; var result = []; for (var i=0; i<o.length; i++) result[i] = o[i]; return result; } // convert a dash-delimited-property to a camelCaseProperty (c/o Prototype, thanks Sam!) Animator.camelize = function(string) { var oStringList = string.split('-'); if (oStringList.length == 1) return oStringList[0]; var camelizedString = string.indexOf('-') == 0 ? oStringList[0].charAt(0).toUpperCase() + oStringList[0].substring(1) : oStringList[0]; for (var i = 1, len = oStringList.length; i < len; i++) { var s = oStringList[i]; camelizedString += s.charAt(0).toUpperCase() + s.substring(1); } return camelizedString; } // syntactic sugar for creating CSSStyleSubjects Animator.apply = function(el, style, options) { if (style instanceof Array) { return new Animator(options).addSubject(new CSSStyleSubject(el, style[0], style[1])); } return new Animator(options).addSubject(new CSSStyleSubject(el, style)); } // make a transition function that gradually accelerates. pass a=1 for smooth // gravitational acceleration, higher values for an exaggerated effect Animator.makeEaseIn = function(a) { return function(state) { return Math.pow(state, a*2); } } // as makeEaseIn but for deceleration Animator.makeEaseOut = function(a) { return function(state) { return 1 - Math.pow(1 - state, a*2); } } // make a transition function that, like an object with momentum being attracted to a point, // goes past the target then returns Animator.makeElastic = function(bounces) { return function(state) { state = Animator.tx.easeInOut(state); return ((1-Math.cos(state * Math.PI * bounces)) * (1 - state)) + state; } } // make an Attack Decay Sustain Release envelope that starts and finishes on the same level // Animator.makeADSR = function(attackEnd, decayEnd, sustainEnd, sustainLevel) { if (sustainLevel == null) sustainLevel = 0.5; return function(state) { if (state < attackEnd) { return state / attackEnd; } if (state < decayEnd) { return 1 - ((state - attackEnd) / (decayEnd - attackEnd) * (1 - sustainLevel)); } if (state < sustainEnd) { return sustainLevel; } return sustainLevel * (1 - ((state - sustainEnd) / (1 - sustainEnd))); } } // make a transition function that, like a ball falling to floor, reaches the target and/ // bounces back again Animator.makeBounce = function(bounces) { var fn = Animator.makeElastic(bounces); return function(state) { state = fn(state); return state <= 1 ? state : 2-state; } } // pre-made transition functions to use with the 'transition' option Animator.tx = { easeInOut: function(pos){ return ((-Math.cos(pos*Math.PI)/2) + 0.5); }, linear: function(x) { return x; }, easeIn: Animator.makeEaseIn(1.5), easeOut: Animator.makeEaseOut(1.5), strongEaseIn: Animator.makeEaseIn(2.5), strongEaseOut: Animator.makeEaseOut(2.5), elastic: Animator.makeElastic(1), veryElastic: Animator.makeElastic(3), bouncy: Animator.makeBounce(1), veryBouncy: Animator.makeBounce(3) } // animates a pixel-based style property between two integer values function NumericalStyleSubject(els, property, from, to, units) { this.els = Animator.makeArray(els); if (property == 'opacity' && window.ActiveXObject) { this.property = 'filter'; } else { this.property = Animator.camelize(property); } this.from = parseFloat(from); this.to = parseFloat(to); this.units = units != null ? units : 'px'; } NumericalStyleSubject.prototype = { setState: function(state) { var style = this.getStyle(state); var visibility = (this.property == 'opacity' && state == 0) ? 'hidden' : ''; var j=0; for (var i=0; i<this.els.length; i++) { try { this.els[i].style[this.property] = style; } catch (e) { // ignore fontWeight - intermediate numerical values cause exeptions in firefox if (this.property != 'fontWeight') throw e; } if (j++ > 20) return; } }, getStyle: function(state) { state = this.from + ((this.to - this.from) * state); if (this.property == 'filter') return "alpha(opacity=" + Math.round(state*100) + ")"; if (this.property == 'opacity') return state; return Math.round(state) + this.units; }, inspect: function() { return "\t" + this.property + "(" + this.from + this.units + " to " + this.to + this.units + ")\n"; } } // animates a colour based style property between two hex values function ColorStyleSubject(els, property, from, to) { this.els = Animator.makeArray(els); this.property = Animator.camelize(property); this.to = this.expandColor(to); this.from = this.expandColor(from); this.origFrom = from; this.origTo |