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'play' : 'pause'; let playing = false; const play = time => { if (state.paused) { playing = false; } else { playing = true; state.x = time; updateView(state.y, form); requestAnimationFrame(play); } } const uiUpdate = ({ value }) => { toggle.text(toggleText(value.paused)); speed.property('value', value.speed); t.property('value', value.t); if (!playing) play(); tv.text(`${(state.y*100).toFixed(0)}%`); sv.text(`${value.speed.toFixed(2)}x`); updateView(value.t, form); }; state.addEventListener("input", uiUpdate); t.on('input', function() { state.y = this.valueAsNumber; state.paused = true; }); speed.on('input', function() { state.speed = this.valueAsNumber }); toggle.on('click', () => state.paused = !state.paused ); uiUpdate({ value: state.value }); return Generators.disposable(form, () => state.removeEventListener("input", uiUpdate)); }33:T708,class Playback { constructor(duration, speed = 1, paused = false) { Object.defineProperties(this, { _paused: { value: paused, writable: true }, _duration: { value: duration, writable: true}, _speed: { value: speed, writable: true }, _x: { value: 0, writable: true }, _list: { value: [], writable: true }, }); this.duration = duration; this.y = 0; this.paused = paused; this.speed = 1; } fract(v) { return v - Math.floor(v); } get value() { return { paused: this.paused, speed: this._speed, t: this.y, } } get paused() { return this._paused; } set x(time) { this._x = (time || performance.now()) - this.start; this.y = this.fract((this._x + this.b) / this.a); this.emit(); } set paused(v) { this._paused = v; if (v) { this._x = 0; this.b = this.y * this.a; } else { this.start = performance.now(); } this.emit(); } set duration(v) { this._duration = v; this.speed = this._speed; } set speed(v) { this._speed = Math.abs(v) < eps ? (v >= 0 ? eps : -eps) : v; this.a = this._duration / this._speed; this.b = this.y * this.a - this._x; this.emit(); } emit() { this.dispatchEvent({ type: "input", value: this.value }); } // EventTarget Interface from https://observablehq.com/@mbostock/synchronized-views addEventListener(type, listener) { if (type != "input" || this._list.includes(listener)) return; this._list = [listener].concat(this._list); } removeEventListener(type, listener) { if (type != "input") return; this._list = this._list.filter(l => l !== listener); } dispatchEvent(event) { const p = Promise.resolve(event); this._list.forEach(l => p.then(l)); } }34:[] 2e:{"title":"Replayable Drawing","cells":[{"id":0,"value":"md`# Replayable Drawing`","pinned":false,"hidden":false,"mode":"ojs"},{"id":385,"value":"md`Experimenting [Synchronized Views](https://observablehq.com/@mbostock/synchronized-views). Draw to record, then use the UI to replay.`","pinned":false,"hidden":false,"mode":"ojs"},{"id":36,"value":"canvas = ctx.canvas","pinned":false,"hidden":false,"mode":"ojs"},{"id":105,"value":"viewof progress = controls(viewof playback)","pinned":false,"hidden":false,"mode":"ojs"},{"id":937,"value":"md`## Rendering`","pinned":false,"hidden":false,"mode":"ojs"},{"id":47,"value":"$30","pinned":false,"hidden":false,"mode":"ojs"},{"id":224,"value":"points = {\n const t = time * progress;\n return data.filter(d => d.start < t && d.start + d.duration > t);\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":529,"value":"makeCircle = {\n const randDir = d3.randomUniform(0,Math.PI * 2);\n const randRadius = d3.randomUniform(10, 40);\n const randDuration = d3.randomUniform(200, waitTime);\n const randDist = d3.randomUniform(30, 50);\n const rand = d3.randomUniform();\n const randHue = d3.randomUniform(0,210);\n return start => {\n const duration = randDuration();\n const theta = randDir();\n const dist = randDist();\n const dir = [0, 1000, [dist * Math.cos(theta), dist * Math.sin(theta)]];\n const radius = [0, duration, randRadius()];\n return {\n start, duration,\n dir, radius,\n hue: randHue(),\n c: mutable mouse,\n }\n }\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":450,"value":"data = {\n let data = this || defaultData;\n if (!recording) return yield data;\n const start = performance.now();\n data = [];\n while (true) {\n data.push(makeCircle(performance.now() - start));\n yield await Promises.delay(30, data);\n }\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":874,"value":"md`### State Handling`","pinned":false,"hidden":false,"mode":"ojs"},{"id":397,"value":"time = {\n const start = performance.now();\n if (!recording) {\n while (waiting) {\n yield (this || 0) + performance.now() - start;\n }\n return yield this || defaultTime;\n } \n while (true) {\n yield performance.now() - start;\n }\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":400,"value":"mutable recording = false","pinned":false,"hidden":false,"mode":"ojs"},{"id":770,"value":"waitTime = 1500","pinned":false,"hidden":false,"mode":"ojs"},{"id":762,"value":"mutable waiting = false","pinned":false,"hidden":false,"mode":"ojs"},{"id":675,"value":"mutable mouse = [0,0]","pinned":false,"hidden":false,"mode":"ojs"},{"id":390,"value":"drag = {\n const elm = d3.select(canvas);\n const dragStart = () => {\n mutable recording = true;\n \n d3.event.on('drag', () => {\n mutable mouse = d3.mouse(canvas);\n }).on('end', async () => {\n mutable recording = false;\n mutable waiting = true;\n await Promises.delay(waitTime);\n mutable waiting = false;\n })\n };\n \n elm.call(\n d3.drag().container(function() { return this; })\n .on('start', dragStart)\n );\n return Generators.disposable(elm, () => elm.on('drag', null));\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":631,"value":"{\n const paused = recording || waiting;\n viewof playback.y = paused ? 1 : 0;\n viewof playback.duration = time;\n viewof playback.paused = paused;\n return 'playback control';\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":843,"value":"md`### Preset Data`","pinned":false,"hidden":false,"mode":"ojs"},{"id":913,"value":"defaultData = {\n const scale = d3.scaleLinear().domain([0,975]).range([0,width]);\n return rawData.map(d => ({ ...d, c: [scale(d.c[0]), d.c[1]]}));\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":835,"value":"defaultTime = 5227","pinned":false,"hidden":false,"mode":"ojs"},{"id":823,"value":"$31","pinned":false,"hidden":false,"mode":"ojs"},{"id":741,"value":"md`## Playback Control`","pinned":false,"hidden":false,"mode":"ojs"},{"id":886,"value":"html``","pinned":false,"hidden":false,"mode":"ojs"},{"id":13,"value":"$32","pinned":false,"hidden":false,"mode":"ojs"},{"id":90,"value":"viewof playback = new Playback(5000)","pinned":false,"hidden":false,"mode":"ojs"},{"id":11,"value":"$33","pinned":false,"hidden":false,"mode":"ojs"},{"id":23,"value":"md`## Misc`","pinned":false,"hidden":false,"mode":"ojs"},{"id":644,"value":"textStyle = () => {\n ctx.fillStyle = '#333333';\n ctx.font = \"12px monospace\";\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":304,"value":"eps = 1e-3","pinned":false,"hidden":false,"mode":"ojs"},{"id":520,"value":"clamp01 = x => x < 0 ? 0 : x > 1 ? 1 : x;","pinned":false,"hidden":false,"mode":"ojs"},{"id":511,"value":"bounce = {\n const f = x => 3 * x * x - 2 * x * x * x;\n return x => f((1-x) * 1.5);\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":15,"value":"updateView = (value, view) => {\n view.value = value;\n view.dispatchEvent(new CustomEvent(\"input\"));\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":45,"value":"line = d3.line().curve(d3.curveLinear).context(ctx)","pinned":false,"hidden":false,"mode":"ojs"},{"id":28,"value":"ctx = DOM.context2d(size[0], size[1]);","pinned":false,"hidden":false,"mode":"ojs"},{"id":29,"value":"size = [width, 400]","pinned":false,"hidden":false,"mode":"ojs"},{"id":5,"value":"md`## Imports`","pinned":false,"hidden":false,"mode":"ojs"},{"id":8,"value":"d3 = require(\"d3@5\")","pinned":false,"hidden":false,"mode":"ojs"}],"files":"$W34","stdlib":"1","titling":"auto"}