From 6ae8ae739a78054f45628ec78d49e3465087cbd7 Mon Sep 17 00:00:00 2001 From: Peter Coles Date: Wed, 16 May 2012 09:48:26 -0400 Subject: [PATCH] first commit - moved project over from "guy" --- README.md | 4 + audio.js | 198 +++++++++++++ index.html | 64 +++++ jquery-1.7.1.min.js | 4 + piano.css | 255 ++++++++++++++++ piano.js | 686 ++++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 1211 insertions(+) create mode 100644 README.md create mode 100644 audio.js create mode 100644 index.html create mode 100644 jquery-1.7.1.min.js create mode 100644 piano.css create mode 100644 piano.js diff --git a/README.md b/README.md new file mode 100644 index 0000000..dc71c2e --- /dev/null +++ b/README.md @@ -0,0 +1,4 @@ +HTML5 JavaScript Piano +====================== + +This is an HTML5 synth piano that generates all of its audio files on the fly. See the [HTML5 JavaScript Piano](http://mrcoles.com/piano/) live. diff --git a/audio.js b/audio.js new file mode 100644 index 0000000..ddfcf67 --- /dev/null +++ b/audio.js @@ -0,0 +1,198 @@ + +// paulirish.com/2009/log-a-lightweight-wrapper-for-consolelog/ +window.log = function f(){ log.history = log.history || []; log.history.push(arguments); if(this.console) { var args = arguments, newarr; args.callee = args.callee.caller; newarr = [].slice.call(args); if (typeof console.log === 'object') log.apply.call(console.log, console, newarr); else console.log.apply(console, newarr);}}; +// make it safe to use console.log always +(function(a){function b(){}for(var c="assert,count,debug,dir,dirxml,error,exception,group,groupCollapsed,groupEnd,info,log,markTimeline,profile,profileEnd,time,timeEnd,trace,warn".split(","),d;!!(d=c.pop());){a[d]=a[d]||b;}}) +(function(){try{console.log();return window.console;}catch(a){return (window.console={});}}()); + + +(function() { + + function asBytes(value, bytes) { + // Convert value into little endian hex bytes + // value - the number as a decimal integer (representing bytes) + // bytes - the number of bytes that this value takes up in a string + + // Example: + // asBytes(2835, 4) + // > '\x13\x0b\x00\x00' + var result = []; + for (; bytes>0; bytes--) { + result.push(String.fromCharCode(value & 255)); + value >>= 8; + } + return result.join(''); + } + + var DataGenerator = $.extend(function(styleFn, volumeFn, cfg) { + cfg = $.extend({ + freq: 440, + volume: 32767, + sampleRate: 2024, // Hz + seconds: .5, + channels: 1 + }, cfg); + + var data = []; + var maxI = cfg.sampleRate * cfg.seconds; + for (var i=0; i < maxI; i++) { + for (var j=0; j < cfg.channels; j++) { + data.push( + asBytes( + volumeFn( + styleFn(cfg.freq, cfg.volume, i, cfg.sampleRate, cfg.seconds, maxI), + cfg.freq, cfg.volume, i, cfg.sampleRate, cfg.seconds, maxI + ), 2 + ) + ); + } + } + return data; + }, { + style: { + wave: function(freq, volume, i, sampleRate, seconds) { + // wave + // i = 0 -> 0 + // i = (sampleRate/freq)/4 -> 1 + // i = (sampleRate/freq)/2 -> 0 + // i = (sampleRate/freq)*3/4 -> -1 + // i = (sampleRate/freq) -> 0 + return Math.sin((2 * Math.PI) * (i / sampleRate) * freq); + }, + squareWave: function(freq, volume, i, sampleRate, seconds, maxI) { + // square + // i = 0 -> 1 + // i = (sampleRate/freq)/4 -> 1 + // i = (sampleRate/freq)/2 -> -1 + // i = (sampleRate/freq)*3/4 -> -1 + // i = (sampleRate/freq) -> 1 + var coef = sampleRate / freq; + return (i % coef) / coef < .5 ? 1 : -1; + }, + triangleWave: function(freq, volume, i, sampleRate, seconds, maxI) { + return Math.asin(Math.sin((2 * Math.PI) * (i / sampleRate) * freq)); + }, + sawtoothWave: function(freq, volume, i, sampleRate, seconds, maxI) { + // sawtooth + // i = 0 -> -1 + // i = (sampleRate/freq)/4 -> -.5 + // i = (sampleRate/freq)/2 -> 0 + // i = (sampleRate/freq)*3/4 -> .5 + // i = (sampleRate/freq) - delta -> 1 + var coef = sampleRate / freq; + return -1 + 2 * ((i % coef) / coef); + } + }, + volume: { + flat: function(data, freq, volume) { + return volume * data; + }, + linearFade: function(data, freq, volume, i, sampleRate, seconds, maxI) { + return volume * ((maxI - i) / maxI) * data; + }, + quadraticFade: function(data, freq, volume, i, sampleRate, seconds, maxI) { + // y = -a(x - m)(x + m); and given point (m, 0) + // y = -(1/m^2)*x^2 + 1; + return volume * ((-1/Math.pow(maxI, 2))*Math.pow(i, 2) + 1) * data; + } + } + }); + DataGenerator.style.default = DataGenerator.style.wave; + DataGenerator.volume.default = DataGenerator.volume.linearFade; + + + function toDataURI(cfg) { + + cfg = $.extend({ + channels: 1, + sampleRate: 2024, // Hz + bitDepth: 16, // bits/sample + seconds: .5, + volume: 20000,//32767, + freq: 440 + }, cfg); + + // + // Format Sub-Chunk + // + + var fmtChunk = [ + 'fmt ', // sub-chunk identifier + asBytes(16, 4), // chunk-length + asBytes(1, 2), // audio format (1 is linear quantization) + asBytes(cfg.channels, 2), + asBytes(cfg.sampleRate, 4), + asBytes(cfg.sampleRate * cfg.channels * cfg.bitDepth / 8, 4), // byte rate + asBytes(cfg.channels * cfg.bitDepth / 8, 2), + asBytes(cfg.bitDepth, 2) + ].join(''); + + // + // Data Sub-Chunk + // + + var sampleData = DataGenerator( + cfg.styleFn || DataGenerator.style.default, + cfg.volumeFn || DataGenerator.volume.default, + cfg); + var samples = sampleData.length; + + var dataChunk = [ + 'data', // sub-chunk identifier + asBytes(samples * cfg.channels * cfg.bitDepth / 8, 4), // chunk length + sampleData.join('') + ].join(''); + + // + // Header + Sub-Chunks + // + + var data = [ + 'RIFF', + asBytes(4 + (8 + fmtChunk.length) + (8 + dataChunk.length), 4), + 'WAVE', + fmtChunk, + dataChunk + ].join(''); + + return 'data:audio/wav;base64,' + btoa(data); + } + + function noteToFreq(stepsFromMiddleC) { + return 440 * Math.pow(2, (stepsFromMiddleC+3) / 12); + } + + var Notes = { + sounds: {}, + getDataURI: function(n, cfg) { + cfg = cfg || {}; + cfg.freq = noteToFreq(n); + return toDataURI(cfg); + }, + getCachedSound: function(n, data) { + var key = n, cfg; + if (data && typeof data == "object") { + cfg = data; + var l = []; + for (var attr in data) { + l.push(attr); + l.push(data[attr]); + } + l.sort(); + key += '-' + l.join('-'); + } else if (typeof data != 'undefined') { + key = n + '.' + key; + } + + var sound = this.sounds[key]; + if (!sound) { + sound = this.sounds[key] = new Audio(this.getDataURI(n, cfg)); + } + return sound; + }, + noteToFreq: noteToFreq + }; + + window.DataGenerator = DataGenerator; + window.Notes = Notes; +})(); diff --git a/index.html b/index.html new file mode 100644 index 0000000..5351bfd --- /dev/null +++ b/index.html @@ -0,0 +1,64 @@ + + + + + Piano! + + + +
+
+
+

Javascript Piano

+
+
+
+
+

Controls:

+

play using home row & above   /

+

change playable keys: “,” & “.”   /

+

shift keyboard: ← & →

+
+
+

Extras:

+

Color - c   /

+

Demo - m   /

+

Visual mode - 8   /

+

Looper - 9   /

+

Help - 0

+ + +
+
+
+
loop
+
+
+
+
+

info

+

↑

+
+

HTML5 Javascript Piano

+

This synth piano is written solely using HTML, JS, and CSS. It contains a small handful of synths with configurable decays, a looper, demo mode, visual mode, and a variety of colors. View controls by hitting the top-right button on the piano.

+

+ It doesn't use a single static audio file, instead it generates them on the fly at the byte level and then converts them to files using the data URI schema. On a similar note, it doesn't use a single image either, just CSS. + You can make pretty much any kind of file with a data URI, such as a + bitmap file or a + favicon. +

+

Currently iOS doesn’t support HTML5 audio well enough in the browser to make this work. So, no go on iPhone and iPad, for now.

+

Various people have been experimenting with audio files and data URIs for a while now. I first came across this implementation by sk89q, which was helpful in getting my audio files to work. For future projects, I will probably use an audio api, but currently it’s just firefox & chrome. For further reading, here is a good overview of the state of HTML5 audio from December 2010.

+

By Peter Coles – May 16, 2012

+
+
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/dev/null +++ b/piano.css @@ -0,0 +1,255 @@ +html,body,div,span,h1,p{margin:0;padding:0;} + +html { + background: #fff; + font: normal 14px/24px futura, Helvetica, Arial, sans serif; + color: #999; +} + +strong { font-weight: normal; } +a { text-decoration: none; } + +html, body { height: 100%; } + +#content { + min-height: 100%; + text-align: left; + overflow: hidden; +} + +#content-inner { + padding: 60px 0; +} + +#piano { + position: relative; + margin: 0 auto; + padding: 80px 40px 16px; + width: 782px; + background: #f33; + border-radius: 20px; + box-shadow: 0 1px 0 #999, 0 2px 0 #999, 0 3px 0 #999, 1px 4px 0 #999, 2px 5px 0 #999, 3px 6px 0 #999, 4px 7px 0 #999, 5px 8px 0 #999, 0 0 8px #000; + z-index: 2; +} + + +/** keys */ + +#piano .keys { + /*width: 1144px;*/ + width: 780px; + padding: 2px 0 0 2px; + overflow: hidden; + background: #000; + border-radius: 0 0 4px 4px; +} + +.key { + float: left; + position: relative; + width: 50px; + height: 180px; + margin: 0 2px 2px 0; + background: #fff; + border-radius: 0 0 4px 4px; +} +.key.pressed, +.key:active { + background: #f4f3f3; + box-shadow: inset 3px 2px 3px #999, inset -3px 2px 3px #999; +} +.key.black { + width: 0; + margin: 0; + z-index: 2; +} +.key.black:after { + content: ""; + position: absolute; + top: -2px; + left: -16px; + display: block; + width: 32px; + height: 117px; + background: #000; + border-radius: 0 0 4px 4px; + box-shadow: 1px 1px 0 #555, 2px 2px 0 #555; +} +.key.black1:after { + left: -20px; +} +.key.black3:after { + left: -16px; +} +.key.black.pressed:after, +.key.black:active:after { + background-color: #222; +} + +/* **/ + + +/** header */ + +h1 { + position: absolute; + top: 25px; + left: 40px; + font-size: 16px; + line-height: 20px; + color: #fff; + text-shadow: -1px -1px 0 #000 +} + +/* **/ + + +/** help */ + +.loop, +.help { + position: absolute; + top: 25px; + right: 42px; + width: 20px; + height: 20px; + color: transparent; + background: rgba(255, 255, 255, .25); + box-shadow: 1px 1px 0 rgba(0, 0, 0, .35), 1px 0 0 rgba(0, 0, 0, .35), 0 1px 0 rgba(0, 0, 0, .35), inset 1px 1px 0 rgba(255,255,255,.4); + border-radius: 2px; + z-index: 10; + font-size: 12px; + cursor: pointer; +} + +.loop.active, +.loop:active, +.help.show, +.help:active { + box-shadow: inset 1px 1px 0 rgba(0, 0, 0, .35); +} + +.loop { + right: 82px; +} + +.help .help-inner { + position: absolute; + top: 0; + right: 0; + width: 0; + height: 0; + line-height: 0; + overflow: hidden; + + transition: all 1s; + -moz-transition: all 1s; /* Firefox 4 */ + -webkit-transition: all 1s; /* Safari and Chrome */ + -o-transition: all 1s; /* Opera */ +} + +.help.show .help-inner { + top: 55px; + padding: 20px; + width: 740px; + height: 142px; + line-height: 24px; + color: #eee; + background: rgba(0, 0, 0, .85); + border-radius: 4px; + cursor: default; +} + +.help.show:focus { outline: none; } + +.opts { margin: 0; overflow: hidden; zoom: 1; width: 740px; height: 36px; line-height: 36px; } +.opts p { float: left; margin: 0 10px 0 0; } +.opts p:first-child { width: 6em; } +.opts p .selected { color: #999; font-style: italic; } + +.toggle { cursor: pointer; } + +.help a { + display: inline-block; + padding: 0 2px; + color: #ccc; + font-weight: bold; + text-decoration: none; +} + +.help a:before { + content: "_"; +} +.help a:after { + content: "_"; +} + +/* **/ + +/** below */ + +#below { + position: relative; + min-height: 100%; + border-top: 2px solid #222; + background: #333; + line-height: 20px; + color: #eee; + text-shadow: 1px 1px 0 #000; +} + +#info { + position: absolute; + top: -42px; + left: 0; + padding: 10px 20px; + line-height: 20px; + color: #333; + text-shadow: none; + cursor: pointer; +} + +#top { + position: absolute; + top: 0; + right: 0; + padding: 10px 20px; + font-size: 20px; + line-height: 20px; + font-weight: bold; + cursor: pointer; +} + +#top:hover { + color: red; +} + +#info:hover { + color: #eee; + text-shadow: 1px 1px 0 #000; + background: #333; + border-radius: 0 10px 0 0; +} + +#below-inner { + margin: 0 auto; + padding: 18px 0 20px; + width: 780px; + text-align: left; +} + +#below-inner h2 { + font-size: 16px; + font-weight: bold; +} + +#below-inner p { + margin-bottom: 20px; +} + +#below-inner a { + color: #fff; + font-weight: bold; +} + +/* **/ diff --git a/piano.js b/piano.js new file mode 100644 index 0000000..32b22ca --- /dev/null +++ b/piano.js @@ -0,0 +1,686 @@ + +(function() { + + // + // Setup keys! + // + + var notesOffset = 0; + + var blackKeys = { + 1: 1, + 3: 3, + 6: 1, + 8: 2, + 10: 3 + }; + $.each(blackKeys, function(k, v) { + blackKeys[k] = ' black black'+v;; + }); + + function blackKeyClass(i) { + return blackKeys[(i % 12) + (i < 0 ? 12 : 0)] || ''; + } + + var $keys = $('
', {'class': 'keys'}).appendTo('#piano'); + + var buildingPiano = false; + + function buildPiano() { + if (buildingPiano) return; + buildingPiano = true; + + $keys.trigger('build-start.piano'); + $keys.empty().off('.play'); + + function addKey(i) { + var dataURI = Notes.getDataURI(i); + + // trick to deal with note getting hit multiple times before finishing... + var sounds = [ + new Audio(dataURI), + new Audio(dataURI), + new Audio(dataURI) + ]; + var curSound = 0; + var pressedTimeout; + dataURI = null; + function play(evt) { + // sound + sounds[curSound].pause(); + try { + sounds[curSound].currentTime = 0.001; //HACK - was for mobile safari, but sort of doesn't matter... + } catch (x) { + console.log(x); + } + sounds[curSound].play(); + curSound = ++curSound % sounds.length; + + var $k = $keys.find('[data-key='+i+']').addClass('pressed'); + + //TODO - it'd be nice to have a single event for triggering and reading + $keys.trigger('played-note.piano', [i, $k]); + + // visual feedback + window.clearTimeout(pressedTimeout); + pressedTimeout = window.setTimeout(function() { + $k.removeClass('pressed'); + }, 200); + } + $keys.on('note-'+i+'.play', play); + var $key = $('
', { + 'class': 'key' + blackKeyClass(i), + 'data-key': i, + mousedown: function(evt) { $keys.trigger('note-'+i+'.play'); } + }).appendTo($keys); + } + + // delayed for-loop to stop browser from crashing :'( + var i = -12, max = 14; + (function go() { + addKey(i + notesOffset); + if (++i < max) { + window.setTimeout(go, 50); + } else { + buildingPiano = false; + $keys.trigger('build-done.piano'); + } + })(); + } + + buildPiano(); + + + // + // Setup synth controls + // + + function camelToText(x) { + x = x.replace(/([A-Z])/g, ' $1'); + return x.charAt(0).toUpperCase() + x.substring(1); + } + + $.each(['volume', 'style'], function(i, setting) { + var $opts = $('
', { + 'class': 'opts', + html: '

' + camelToText(setting) + ':

' + }).appendTo('#synth-settings'); + + $.each(DataGenerator[setting], function(name, fn) { + if (name != 'default') { + $('

') + .append($('', { + text: camelToText(name), + href: '#', + 'class': fn === DataGenerator[setting].default ? 'selected' : '', + click: function(evt) { + evt.preventDefault(); + DataGenerator[setting].default = fn; + buildPiano(); + var $this = $(this); + $this.closest('.opts').find('.selected').removeClass('selected'); + $this.addClass('selected'); + } + })) + .appendTo($opts); + } + }); + }); + + + // + // Setup keyboard interaction + // + + var keyNotes = { + /*a*/ 65: 0, // c + /*w*/ 87: 1, // c# + /*s*/ 83: 2, // d + /*e*/ 69: 3, // d# + /*d*/ 68: 4, // e + /*f*/ 70: 5, // f + /*t*/ 84: 6, // f# + /*g*/ 71: 7, // g + /*y*/ 89: 8, // g# + /*h*/ 72: 9, // a + /*u*/ 85: 10, // a# + /*j*/ 74: 11, // b + /*k*/ 75: 12, // c + /*o*/ 79: 13, // c# + /*l*/ 76: 14, // d + /*p*/ 80: 15, // d# + /*;*/ 186: 16, // e + /*;*/ 59: 16, // e ... gotta figure out why it's sometimes 186 and sometimes 59 + /*,*/ 222: 17, // f + /*]*/ 221: 18, // f# + /*enter*/ 13: 19 // g + }; + var notesShift = -12; + var downKeys = {}; + + function isModifierKey(evt) { + return evt.metaKey || evt.shiftKey || evt.altKey; + } + + $(window).keydown(function(evt) { + var keyCode = evt.keyCode; + // prevent repeating keys + if (!downKeys[keyCode] && !isModifierKey(evt)) { + downKeys[keyCode] = 1; + var key = keyNotes[keyCode]; + if (typeof key != 'undefined') { + $keys.trigger('note-'+(key+notesShift+notesOffset)+'.play'); + evt.preventDefault(); + } else if (evt.keyCode == 188) { + notesShift = -12; + } else if (evt.keyCode == 190) { + notesShift = 0; + } else if (keyCode == 37 || keyCode == 39) { + notesOffset += (keyCode == 37 ? -1 : 1) * 12; + buildPiano(); + } + } + }).keyup(function(evt) { + delete downKeys[evt.keyCode]; + }); + + + // + // Piano colors + // + + var colors = 'f33 33f 3f3 ff3 f3f 3ff'.split(' '), + curColor = 0; + + function colorHandler(evt) { + if (evt.type === 'click' || (evt.keyCode == 67 && !isModifierKey(evt))) { + if (++curColor >= colors.length) curColor = 0; + document.getElementById('piano').style.backgroundColor = '#' + colors[curColor]; + } + } + + $(window).keyup(colorHandler); + $('.toggle-color').click(colorHandler); + + // + // Help controls + // + + var $help = $('.help'); + + $(window).click(function(evt) { + var $closestHelp = $(evt.target).closest('.help'); + if (!((evt.target.nodeName == 'A' || ~evt.target.className.search('hold')) && $closestHelp.length) && + ($closestHelp.length || $help.hasClass('show'))) { + $help.toggleClass('show'); + } + }); + + var qTimeout, qCanToggle = true;; + $(window).keypress(function(evt) { + // trigger help when ? is pressed, but make sure it doesn't repeat crazy + if (evt.which == 63 || evt.which == 48) { + window.clearTimeout(qTimeout); + qTimeout = window.setTimeout(function() { + qCanToggle = true; + }, 1000); + if (qCanToggle) { + qCanToggle = false; + $help.toggleClass('show'); + } + } + }); + + window.setTimeout(function() { + $help.removeClass('show'); + }, 700); + + // prevent quick find... + $(window).keydown(function(evt) { + if (evt.target.nodeName != 'INPUT' && evt.target.nodeName != 'TEXTAREA') { + if (evt.keyCode == 222) { + evt.preventDefault(); + return false; + } + } + return true; + }); + + // + // Scroll nav + // + $.each([['#info', '#below'], ['#top', '#content']], function(i, x) { + $(x[0]).click(function() { + $('html,body').animate({ + scrollTop: $(x[1]).offset().top + }, 1000); + }); + }); + + + // + // Demo + // + (function(undefined) { + var chopsticks = (function() { + var data = [ + { + 'style': 'wave', + 'volume': 'linearFade', + 'notesOffset': 0 + } + ]; + + var main = [ + [6, -7, -5], + [6, -7, -5], + [6, -7, -5], + [6, -7, -5], + [6, -7, -5], + [6, -7, -5], + + [6, -8, -5], + [6, -8, -5], + [6, -8, -5], + [6, -8, -5], + [6, -8, -5], + [6, -8, -5], + + [6, -10, -1], + [6, -10, -1], + [6, -10, -1], + [6, -10, -1], + [6, -10, -1], + [6, -10, -1], + + [6, -12, 0], + [6, -12, 0], + [6, -12, 0] + ]; + + data.push.apply(data, main); + data.push( + [6, -12, 0], + [6, -10, -1], + [6, -8, -3] + ); + data.push.apply(data, main); + data.push( + [6, -12, 0], + [6, -5], + [6, -8], + + [6, -12], + [12] + ); + + var main2 = [ + [6, 0, 4], + [6, -1, 2], + [6], + + [6, -3, 0], + [6, -5, -1], + [6], + + [6, -7, -3], + [6, -8, -5], + [6], + + [6, 0, 4], + [6, 0, 4], + [6], + + [6, -8, -5], + [6, -10, -7], + [6], + + [6, -1, 2], + [6, -1, 2], + [6] + ]; + data.push.apply(data, main2); + data.push( + [6, -10, -7], + [6, -12, -8], + [6], + + [6, -8, 0], + [6, -8, 0], + [6] + ); + data.push.apply(data, main2); + data.push( + [6, -5, -1], + [6, -8, 0], + [6, -5], + + [6, -8], + [6, -12], + [6] + ); + return data; + })(); + + + var demoing = false, demoingTimeout; + function demo(data) { + var cfg = data[0]; + if (!buildingPiano && !demoing) { + demoing = true; + cfg.style && (DataGenerator.style.default = DataGenerator.style[cfg.style]); + cfg.volume && (DataGenerator.volume.default = DataGenerator.volume[cfg.volume]); + cfg.notesOffset !== undefined && (notesOffset = cfg.notesOffset); + $keys.one('build-done.piano', function() { + //NOTE - jQuery.map flattens arrays + var i = 0, song = $.map(data, function(x, i) { return i == 0 ? null : [x]; }); + (function play() { + if (!demoing) return; + if (i >= song.length) { i = 0; } + var part = song[i++]; + if (part) { + var delay = part[0]; + demoingTimeout = window.setTimeout(function() { + demoing && play(); + for (var j=1, len=part.length; j', { + css: { + position: 'absolute', + top: ($piano.offset().top + $piano.outerHeight() - 1) + 'px', + left: '50%', + marginLeft: Math.floor(-W/2) + 'px', // need to figure this out... + width: W, + height: H + } + }) + .attr('width', W) + .attr('height', H) + .prependTo('body'), + canvas = $canvas.get(0), + ctx = canvas.getContext('2d'); + + function choice(x) { + return x[Math.floor(Math.random()*x.length)]; + } + + function getData(note) { + var data = [], freq = Notes.noteToFreq(note), vol = 1, sampleRate = 2024, secs = .1; + var volumeFn = DataGenerator.volume.default; + var styleFn = DataGenerator.style.default; + var maxI = sampleRate * secs; + for (var i=0; i endY in steps + // each step is yPerStep = (endY - startY) / steps long + // each step covers iPerStep = len / steps data points + // at an increment of yIncrement = yPerStep / iPerStep + + (function draw() { + + if (step < steps) { + ctx.strokeStyle = color; + ctx.lineWidth = 1; + ctx.beginPath(); + ctx.moveTo(startX, startY); + var newMax = i + iPerStep, first = true; + for (; i<=newMax; i++) { + startY += yIncrement; + ctx[first ? 'moveTo' : 'lineTo'](startX + data[i]*amplitude, startY); + first = false; + if (startY > H) return; + } + i--; // keep an overlap between draws + startY -= yIncrement; + ctx.stroke(); + } + + if (keyAnimCounts[key] == animCount && step >= cleanupStepDelay) { + var cleanupStep = step - cleanupStepDelay; + ctx.clearRect(startX - amplitude - 5, yPerStep * cleanupStep, + (amplitude + 5) * 2, yPerStep * (cleanupStep + 1)); + } + + if (++step < steps + cleanupStepDelay) { + window.setTimeout(draw, stepRate); + } + })(); + }); + + // button + var bW = 20, + bH = 20, + $loop = $('.loop'), + $button = $('', { + css: { + position: 'absolute', + top: (parseInt($loop.css('top')) + 1) + 'px', + right: (parseInt($loop.css('right')) + 34) + 'px', + width: bW, + height: bH, + cursor: 'pointer' + } + }) + .attr('width', bW) + .attr('height', bH) + .appendTo('#piano'), + button = $button.get(0), + bctx = button.getContext('2d'), + coords = [ + [15, 1], + [5, 9], + [9, 11], + [5, 19], + [15, 11], + [11, 9] + ], + coordsLen = coords.length; + + bctx.strokeStyle = 'rgba(0,0,0,.5)'; + bctx.lineWidth = .5; + + function draw() { + bctx.fillStyle = shouldAnimate ? 'rgba(255,255,0,.75)' : 'rgba(0,0,0,.25)'; + bctx.clearRect(0, 0, bW, bH); + bctx.beginPath(); + for (var i=0; i
"); + // $('