mirror of
https://github.com/openseadragon/openseadragon.git
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249 lines
8.3 KiB
JavaScript
249 lines
8.3 KiB
JavaScript
/*
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* OpenSeadragon - Spring
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*
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* Copyright (C) 2009 CodePlex Foundation
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* Copyright (C) 2010-2013 OpenSeadragon contributors
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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
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* met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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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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*
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* - Neither the name of CodePlex Foundation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* 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
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* 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
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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(function( $ ){
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/**
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* @class Spring
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* @memberof OpenSeadragon
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* @param {Object} options - Spring configuration settings.
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* @param {Number} options.springStiffness - Spring stiffness. Must be greater than zero.
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* The closer to zero, the closer to linear animation.
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* @param {Number} options.animationTime - Animation duration per spring, in seconds.
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* Must be zero or greater.
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* @param {Number} [options.initial=0] - Initial value of spring.
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* @param {Boolean} [options.exponential=false] - Whether this spring represents
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* an exponential scale (such as zoom) and should be animated accordingly. Note that
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* exponential springs must have non-zero values.
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*/
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$.Spring = function( options ) {
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var args = arguments;
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if( typeof( options ) != 'object' ){
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//allows backward compatible use of ( initialValue, config ) as
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//constructor parameters
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options = {
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initial: args.length && typeof ( args[ 0 ] ) == "number" ?
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args[ 0 ] :
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undefined,
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/**
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* Spring stiffness.
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* @member {Number} springStiffness
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* @memberof OpenSeadragon.Spring#
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*/
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springStiffness: args.length > 1 ?
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args[ 1 ].springStiffness :
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5.0,
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/**
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* Animation duration per spring.
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* @member {Number} animationTime
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* @memberof OpenSeadragon.Spring#
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*/
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animationTime: args.length > 1 ?
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args[ 1 ].animationTime :
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1.5
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};
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}
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$.console.assert(typeof options.springStiffness === "number" && options.springStiffness !== 0,
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"[OpenSeadragon.Spring] options.springStiffness must be a non-zero number");
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$.console.assert(typeof options.animationTime === "number" && options.animationTime >= 0,
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"[OpenSeadragon.Spring] options.animationTime must be a number greater than or equal to 0");
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if (options.exponential) {
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this._exponential = true;
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delete options.exponential;
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}
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$.extend( true, this, options);
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/**
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* @member {Object} current
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* @memberof OpenSeadragon.Spring#
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* @property {Number} value
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* @property {Number} time
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*/
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this.current = {
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value: typeof ( this.initial ) == "number" ?
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this.initial :
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(this._exponential ? 0 : 1),
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time: $.now() // always work in milliseconds
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};
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$.console.assert(!this._exponential || this.current.value !== 0,
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"[OpenSeadragon.Spring] value must be non-zero for exponential springs");
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/**
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* @member {Object} start
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* @memberof OpenSeadragon.Spring#
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* @property {Number} value
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* @property {Number} time
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*/
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this.start = {
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value: this.current.value,
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time: this.current.time
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};
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/**
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* @member {Object} target
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* @memberof OpenSeadragon.Spring#
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* @property {Number} value
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* @property {Number} time
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*/
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this.target = {
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value: this.current.value,
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time: this.current.time
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};
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if (this._exponential) {
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this.start._logValue = Math.log(this.start.value);
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this.target._logValue = Math.log(this.target.value);
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this.current._logValue = Math.log(this.current.value);
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}
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};
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/** @lends OpenSeadragon.Spring.prototype */
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$.Spring.prototype = {
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/**
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* @function
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* @param {Number} target
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*/
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resetTo: function( target ) {
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$.console.assert(!this._exponential || target !== 0,
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"[OpenSeadragon.Spring.resetTo] target must be non-zero for exponential springs");
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this.start.value = this.target.value = this.current.value = target;
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this.start.time = this.target.time = this.current.time = $.now();
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if (this._exponential) {
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this.start._logValue = Math.log(this.start.value);
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this.target._logValue = Math.log(this.target.value);
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this.current._logValue = Math.log(this.current.value);
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}
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},
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/**
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* @function
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* @param {Number} target
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*/
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springTo: function( target ) {
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$.console.assert(!this._exponential || target !== 0,
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"[OpenSeadragon.Spring.springTo] target must be non-zero for exponential springs");
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this.start.value = this.current.value;
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this.start.time = this.current.time;
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this.target.value = target;
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this.target.time = this.start.time + 1000 * this.animationTime;
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if (this._exponential) {
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this.start._logValue = Math.log(this.start.value);
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this.target._logValue = Math.log(this.target.value);
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}
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},
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/**
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* @function
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* @param {Number} delta
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*/
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shiftBy: function( delta ) {
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this.start.value += delta;
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this.target.value += delta;
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if (this._exponential) {
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$.console.assert(this.target.value !== 0 && this.start.value !== 0,
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"[OpenSeadragon.Spring.shiftBy] spring value must be non-zero for exponential springs");
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this.start._logValue = Math.log(this.start.value);
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this.target._logValue = Math.log(this.target.value);
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}
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},
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setExponential: function(value) {
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this._exponential = value;
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if (this._exponential) {
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$.console.assert(this.current.value !== 0 && this.target.value !== 0 && this.start.value !== 0,
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"[OpenSeadragon.Spring.setExponential] spring value must be non-zero for exponential springs");
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this.start._logValue = Math.log(this.start.value);
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this.target._logValue = Math.log(this.target.value);
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this.current._logValue = Math.log(this.current.value);
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}
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},
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/**
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* @function
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*/
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update: function() {
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this.current.time = $.now();
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var startValue, targetValue;
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if (this._exponential) {
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startValue = this.start._logValue;
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targetValue = this.target._logValue;
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} else {
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startValue = this.start.value;
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targetValue = this.target.value;
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}
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var currentValue = (this.current.time >= this.target.time) ?
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targetValue :
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startValue +
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( targetValue - startValue ) *
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transform(
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this.springStiffness,
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( this.current.time - this.start.time ) /
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( this.target.time - this.start.time )
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);
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if (this._exponential) {
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this.current.value = Math.exp(currentValue);
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} else {
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this.current.value = currentValue;
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}
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}
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};
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/**
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* @private
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*/
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function transform( stiffness, x ) {
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return ( 1.0 - Math.exp( stiffness * -x ) ) /
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( 1.0 - Math.exp( -stiffness ) );
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}
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}( OpenSeadragon ));
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