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A toolkit for computer-aided musicology, Javascript version

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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Music21j Source: music21/duration.js</title> <!--[if lt IE 9]> <script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script> <![endif]--> <link type="text/css" rel="stylesheet" href="styles/sunlight.default.css"> <link type="text/css" rel="stylesheet" href="styles/site.spruce.css"> </head> <body> <div class="container-fluid"> <div class="navbar navbar-fixed-top navbar-inverse"> <div class="navbar-inner"> <a class="brand" href="index.html">Music21j</a> <ul class="nav"> <li class="dropdown"> <a href="namespaces.list.html" class="dropdown-toggle" data-toggle="dropdown">Namespaces<b class="caret"></b></a> <ul class="dropdown-menu "> <li> <a href="music21.html">music21</a> </li> <li> <a href="music21.articulations.html">music21.articulations</a> </li> <li> <a href="music21.audioSearch.html">music21.audioSearch</a> </li> <li> <a href="music21.base.html">music21.base</a> </li> <li> <a 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href="music21.stream.Stream.html">music21.stream.Stream</a> </li> <li> <a href="music21.stream.Voice.html">music21.stream.Voice</a> </li> <li> <a href="music21.tempo.Metronome.html">music21.tempo.Metronome</a> </li> <li> <a href="music21.tie.Tie.html">music21.tie.Tie</a> </li> <li> <a href="music21.vfShow.Renderer.html">music21.vfShow.Renderer</a> </li> <li> <a href="music21.vfShow.RenderStack.html">music21.vfShow.RenderStack</a> </li> <li> <a href="Notation.html">Notation</a> </li> <li> <a href="Page.html">Page</a> </li> <li> <a href="Recorder.html">Recorder</a> </li> </ul> </li> <li class="dropdown"> <a href="global.html" class="dropdown-toggle" data-toggle="dropdown">Global<b class="caret"></b></a> <ul class="dropdown-menu "> <li> <a href="global.html#getM21attribute">getM21attribute</a> </li> <li> <a href="global.html#layout">layout</a> </li> <li> <a href="global.html#midiNumDiffFromFrequency">midiNumDiffFromFrequency</a> </li> <li> <a href="global.html#recorderWorkerJs">recorderWorkerJs</a> </li> <li> <a href="global.html#unpickler">unpickler</a> </li> <li> <a href="global.html#warnBanner">warnBanner</a> </li> </ul> </li> </ul> </div> </div> <div class="row-fluid"> <div class="span12"> <div id="main"> <h1 class="page-title">Source: music21/duration.js</h1> <section> <article> <pre class="sunlight-highlight-javascript linenums">/** * music21j -- Javascript reimplementation of Core music21 features. * music21/duration -- duration routines * * Copyright (c) 2013-16, Michael Scott Cuthbert and cuthbertLab * Based on music21, Copyright (c) 2006-18, Michael Scott Cuthbert and cuthbertLab * */ import { Music21Exception } from './exceptions21.js'; import { common } from './common.js'; import { debug } from './debug.js'; import { prebase } from './prebase.js'; /** * Duration module. See {@link music21.duration} * * @requires music21/common * @requires music21/prebase * @exports music21/duration */ /** * Module that holds **music21** classes and * tools for dealing with durations, especially * the {@link music21.duration.Duration} class. * * @namespace music21.duration * @memberof music21 */ export const duration = {}; /** * Object mapping int to name, as in `{1: 'whole'}` etc. * * @memberof music21.duration * @type {Object} */ duration.typeFromNumDict = { 1: 'whole', 2: 'half', 4: 'quarter', 8: 'eighth', 16: '16th', 32: '32nd', 64: '64th', 128: '128th', 256: '256th', 512: '512th', 1024: '1024th', 0: 'zero', '0.5': 'breve', '0.25': 'longa', '0.125': 'maxima', '0.0625': 'duplex-maxima', }; duration.quarterTypeIndex = 6; // where is quarter in the following array. duration.ordinalTypeFromNum = [ 'duplex-maxima', 'maxima', 'longa', 'breve', 'whole', 'half', 'quarter', 'eighth', '16th', '32nd', '64th', '128th', '256th', '512th', '1024th', ]; duration.vexflowDurationArray = [ undefined, undefined, undefined, undefined, 'w', 'h', 'q', '8', '16', '32', undefined, undefined, undefined, undefined, undefined, ]; /** * Duration object; found as the `.duration` attribute on {@link music21.base.Music21Object} instances * such as {@link music21.note.Note} * * @class Duration * @memberof music21.duration * @extends music21.prebase.ProtoM21Object * @param {(number|undefined)} ql - quarterLength (default 1.0) */ export class Duration extends prebase.ProtoM21Object { constructor(ql) { super(); this._quarterLength = 0.0; this._dots = 0; this._durationNumber = undefined; this._type = 'zero'; this._tuplets = []; if (typeof ql === 'string') { this.type = ql; } else if (ql !== undefined) { this.quarterLength = ql; } this._cloneCallbacks._tuplets = this.cloneCallbacksTupletFunction; } /** * Read or sets the number of dots on the duration. * * Updates the quarterLength * * @type Number * @instance * @default 0 * @memberof music21.duration.Duration * @example * var d = new music21.duration.Duration(2); * d.dots === 0; // true * d.dots = 1; * d.quarterLength == 3; // true; */ get dots() { return this._dots; } set dots(numDots) { this._dots = numDots; this.updateQlFromFeatures(); } /** * Read or sets the quarterLength of the Duration * * Updates the type, dots, tuplets(?) * * @type Number * @instance * @default 1.0 * @memberof music21.duration.Duration * @example * var d = new music21.duration.Duration(2); * d.quarterLength == 2.0; // true; * d.quarterLength = 1.75; * d.dots == 2; // true * d.type == 'quarter'; // true */ get quarterLength() { return this._quarterLength; } set quarterLength(ql) { if (ql === undefined) { ql = 1.0; } this._quarterLength = ql; this.updateFeaturesFromQl(); } /** * Read or sets the type of the duration. * * Updates the quarterLength * * @type String * @instance * @default 'quarter' * @memberof music21.duration.Duration * @example * var d = new music21.duration.Duration(2); * d.type == 'half; // true * d.type = 'breve'; * d.quarterLength == 8.0; // true * d.dots = 1; * d.type = 'quarter'; // will not change dots * d.quarterLength == 1.5; // true */ get type() { return this._type; } set type(typeIn) { const typeNumber = duration.ordinalTypeFromNum.indexOf(typeIn); if (typeNumber === -1) { console.log('invalid type ' + typeIn); throw new Music21Exception('invalid type ' + typeIn); } this._type = typeIn; this.updateQlFromFeatures(); } /** * Reads the tuplet Array for the duration. * * The tuplet array should be considered Read Only. * Use {@link music21.duration.Duration#appendTuplet} to * add a tuplet (no way to remove yet) * * @type Array&lt;music21.duration.Tuplet> * @instance * @default [] * @memberof music21.duration.Duration */ get tuplets() { return this._tuplets; } /** * Read-only: the duration expressed for VexFlow * * @type String * @instance * @default 'd' * @memberof music21.duration.Duration * @example * var d = new music21.duration.Duration(2); * d.vexflowDuration == 'h'; // true; * d.dots = 2; * d.vexflowDuration == 'hdd'; // true; */ get vexflowDuration() { const typeNumber = duration.ordinalTypeFromNum.indexOf(this.type); let vd = duration.vexflowDurationArray[typeNumber]; if (this.dots > 0) { for (let i = 0; i &lt; this.dots; i++) { vd += 'd'; // vexflow does not handle double dots .. or does it??? } } return vd; } cloneCallbacksTupletFunction(tupletKey, ret, obj) { // make sure that tuplets clone properly const newTuplets = []; for (let i = 0; i &lt; obj[tupletKey].length; i++) { const newTuplet = obj[tupletKey][i].clone(); // console.log('cloning tuplets', obj[tupletKey][i], newTuplet); newTuplets.push(newTuplet); } ret[tupletKey] = newTuplets; } _findDots(ql) { if (ql === 0) { return 0; } // zero length stream probably; const typeNumber = duration.ordinalTypeFromNum.indexOf(this._type); const powerOfTwo = Math.pow(2, duration.quarterTypeIndex - typeNumber); // alert(undottedQL * 1.5 + " " + ql) // console.log('find dots called on ql: ', ql, typeNumber, powerOfTwo); for (let dotsNum = 0; dotsNum &lt;= 4; dotsNum++) { const dotMultiplier = (Math.pow(2, dotsNum) - 1.0) / Math.pow(2, dotsNum); const durationMultiplier = 1 + dotMultiplier; if (Math.abs(powerOfTwo * durationMultiplier - ql) &lt; 0.0001) { return dotsNum; } } if (debug) { console.log('no dots available for ql; probably a tuplet', ql); } return 0; } updateQlFromFeatures() { const typeNumber = duration.ordinalTypeFromNum.indexOf(this._type); // must be set property const undottedQuarterLength = Math.pow( 2, duration.quarterTypeIndex - typeNumber ); const dottedMultiplier = 1 + (Math.pow(2, this._dots) - 1) / Math.pow(2, this._dots); const unTupletedQl = undottedQuarterLength * dottedMultiplier; let tupletCorrectedQl = unTupletedQl; this._tuplets.forEach(tuplet => { tupletCorrectedQl *= tuplet.tupletMultiplier(); }); this._quarterLength = tupletCorrectedQl; } updateFeaturesFromQl() { const ql = this._quarterLength; this._tuplets = []; if (ql === 0) { this._type = 'zero'; this._dots = 0; return; } const powerOfTwo = Math.floor(Math.log(ql + 0.00001) / Math.log(2)); let typeNumber = duration.quarterTypeIndex - powerOfTwo; this._type = duration.ordinalTypeFromNum[typeNumber]; // console.log(this._findDots); this._dots = this._findDots(ql); const undottedQuarterLength = Math.pow( 2, duration.quarterTypeIndex - typeNumber ); const dottedMultiplier = 1 + (Math.pow(2, this._dots) - 1) / Math.pow(2, this._dots); let unTupletedQl = undottedQuarterLength * dottedMultiplier; if (unTupletedQl !== ql &amp;&amp; ql !== 0) { typeNumber -= 1; this._type = duration.ordinalTypeFromNum[typeNumber]; // increase type: eighth to quarter etc. unTupletedQl *= 2; const tupletRatio = ql / unTupletedQl; const ratioRat = common.rationalize(tupletRatio); if (ratioRat === undefined) { // probably a Stream with a length that is inexpressable; } else { const t = new duration.Tuplet( ratioRat.denominator, ratioRat.numerator, new duration.Duration(unTupletedQl) ); this.appendTuplet(t, true); // skipUpdateQl } // console.log(ratioRat, ql, unTupletedQl); } return; } /** * Add a tuplet to music21j * * @memberof music21.duration.Duration * @param {music21.duration.Tuplet} newTuplet - tuplet to add to `.tuplets` * @param {boolean} [skipUpdateQl=false] - update the quarterLength afterwards? */ appendTuplet(newTuplet, skipUpdateQl) { newTuplet.frozen = true; this._tuplets.push(newTuplet); if (skipUpdateQl !== true) { this.updateQlFromFeatures(); } } } duration.Duration = Duration; /** * Represents a Tuplet; found in {@link music21.duration.Duration#tuplets} * * @class Tuplet * @memberof music21.duration * @extends music21.prebase.ProtoM21Object * @param {number} numberNotesActual - numerator of the tuplet, default 3 * @param {number} numberNotesNormal - denominator of the tuplet, default 2 * @param {(music21.duration.Duration|number)} durationActual - duration or quarterLength of duration type, default music21.duration.Duration(0.5) * @param {(music21.duration.Duration|number)} durationNormal - unused; see music21p for description */ export class Tuplet extends prebase.ProtoM21Object { constructor( numberNotesActual, numberNotesNormal, durationActual, durationNormal ) { super(); this.numberNotesActual = numberNotesActual || 3; this.numberNotesNormal = numberNotesNormal || 2; this.durationActual = durationActual || new duration.Duration(0.5); if (typeof this.durationActual === 'number') { this.durationActual = new duration.Duration(this.durationActual); } this.durationNormal = durationNormal || this.durationActual; this.frozen = false; this.type = undefined; /** * Show a bracket above the tuplet * * @memberof music21.duration.Tuplet# * @member {Boolean} bracket * @default true */ this.bracket = true; /** * Bracket placement. Options are `above` or `below`. * * @memberof music21.duration.Tuplet# * @member {String} placement * @default 'above' */ this.placement = 'above'; /** * What to show above the Tuplet. Options are `number`, `type`, or (string) `none`. * * @memberof music21.duration.Tuplet# * @member {String} tupletActualShow * @default 'number' */ this.tupletActualShow = 'number'; this.tupletNormalShow = undefined; // undefined, 'ratio' for ratios, 'type' for ratioed notes (does not work) } /** * A nice name for the tuplet. * * @type String * @instance * @readonly * @memberof music21.duration.Tuplet */ get fullName() { // actual is what is presented to viewer const numActual = this.numberNotesActual; const numNormal = this.numberNotesNormal; if (numActual === 3 &amp;&amp; numNormal === 2) { return 'Triplet'; } else if (numActual === 5 &amp;&amp; (numNormal === 4 || numNormal === 2)) { return 'Quintuplet'; } else if (numActual === 6 &amp;&amp; numNormal === 4) { return 'Sextuplet'; } const ordStr = common.ordinalAbbreviation(numNormal, true); // plural return ( 'Tuplet of ' + numActual.toString() + '/' + numNormal.toString() + ordStr ); } /** * Set both durationActual and durationNormal for the tuplet. * * @memberof music21.duration.Tuplet * @param {string} type - a duration type, such as `half`, `quarter` * @returns {music21.duration.Duration} A converted {@link music21.duration.Duration} matching `type` */ setDurationType(type) { if (this.frozen === true) { throw new Music21Exception( 'A frozen tuplet (or one attached to a duration) is immutable' ); } this.durationActual = new duration.Duration(type); this.durationNormal = this.durationActual; return this.durationActual; } /** * Sets the tuplet ratio. * * @memberof music21.duration.Tuplet * @param {Number} actual - number of notes in actual (e.g., 3) * @param {Number} normal - number of notes in normal (e.g., 2) * @returns {undefined} */ setRatio(actual, normal) { if (this.frozen === true) { throw new Music21Exception( 'A frozen tuplet (or one attached to a duration) is immutable' ); } this.numberNotesActual = actual || 3; this.numberNotesNormal = normal || 2; } /** * Get the quarterLength corresponding to the total length that * the completed tuplet (i.e., 3 notes in a triplet) would occupy. * * @memberof music21.duration.Tuplet * @returns {Number} A quarter length. */ totalTupletLength() { return this.numberNotesNormal * this.durationNormal.quarterLength; } /** * The amount by which each quarter length is multiplied to get * the tuplet. For instance, in a normal triplet, this is 0.666 * * @memberof music21.duration.Tuplet * @returns {Number} A float of the multiplier */ tupletMultiplier() { const lengthActual = this.durationActual.quarterLength; return ( this.totalTupletLength() / (this.numberNotesActual * lengthActual) ); } } duration.Tuplet = Tuplet; </pre> </article> </section> </div> <div class="clearfix"></div> <footer> <span class="copyright"> Music21j, Copyright © 2013-2018 Michael Scott Cuthbert and cuthbertLab. </span> <br /> <span class="jsdoc-message"> Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.5.5</a> on Wed Jul 4th 2018 using the <a href="https://github.com/terryweiss/docstrap">DocStrap template</a>. </span> </footer> </div> <br clear="both"> </div> </div> <!--<script src="scripts/sunlight.js"></script>--> <script src="scripts/docstrap.lib.js"></script> <script src="scripts/bootstrap-dropdown.js"></script> <script src="scripts/toc.js"></script> <script> $( function () { $( "[id*='$']" ).each( function () { var $this = $( this ); $this.attr( "id", $this.attr( "id" ).replace( "$", "__" ) ); } ); $( "#toc" ).toc( { anchorName : function ( i, heading, prefix ) { return $( heading ).attr( "id" ) || ( prefix + i ); }, selectors : "h1,h2,h3,h4", showAndHide : false, scrollTo : "100px" } ); $( "#toc>ul" ).addClass( "nav nav-pills nav-stacked" ); $( "#main span[id^='toc']" ).addClass( "toc-shim" ); $( '.dropdown-toggle' ).dropdown(); // $( ".tutorial-section pre, .readme-section pre" ).addClass( "sunlight-highlight-javascript" ).addClass( "linenums" ); $( ".tutorial-section pre, .readme-section pre" ).each( function () { var $this = $( this ); var example = $this.find( "code" ); exampleText = example.html(); var lang = /{@lang (.*?)}/.exec( exampleText ); if ( lang && lang[1] ) { exampleText = exampleText.replace( lang[0], "" ); example.html( exampleText ); lang = lang[1]; } else { lang = "javascript"; } if ( lang ) { $this .addClass( "sunlight-highlight-" + lang ) .addClass( "linenums" ) .html( example.html() ); } } ); Sunlight.highlightAll( { lineNumbers : true, showMenu : true, enableDoclinks : true } ); } ); </script> <!--Navigation and Symbol Display--> <!--Google Analytics--> </body> </html>