atlas/web/_js/time.js

/*
	========================================================================
	The 2022 /r/place Atlas

	An Atlas of Reddit's 2022 /r/place, with information to each
	artwork	of the canvas provided by the community.

	Copyright (c) 2017 Roland Rytz <roland@draemm.li>
	Copyright (c) 2022 Place Atlas contributors

	Licensed under the GNU Affero General Public License Version 3
	https://place-atlas.stefanocoding.me/license.txt
	========================================================================
*/

const variationsConfig = {
	default: {
		name: "r/place",
		code: "",
		default: 164,
		versions: [{ "timestamp": 1648818000, "url": ["./_img/canvas/place30ex/start.png"] }, { "timestamp": 1648819800, "url": ["./_img/canvas/place30/005.png", "./_img/canvas/place30/000_005.png"] }, { "timestamp": 1648821600, "url": ["./_img/canvas/place30/005.png", "./_img/canvas/place30/001_005.png"] }, { "timestamp": 1648823400, "url": ["./_img/canvas/place30/005.png", "./_img/canvas/place30/002_005.png"] }, { "timestamp": 1648825200, "url": ["./_img/canvas/place30/005.png", "./_img/canvas/place30/003_005.png"] }, { "timestamp": 1648827000, "url": ["./_img/canvas/place30/005.png", "./_img/canvas/place30/004_005.png"] }, { "timestamp": 1648828800, "url": "./_img/canvas/place30/005.png" }, { "timestamp": 1648830600, "url": ["./_img/canvas/place30/005.png", "./_img/canvas/place30/006_005.png"] }, { "timestamp": 1648832400, "url": ["./_img/canvas/place30/005.png", "./_img/canvas/place30/007_005.png"] }, { "timestamp": 1648834200, "url": ["./_img/canvas/place30/005.png", "./_img/canvas/place30/008_005.png"] }, { "timestamp": 1648836000, "url": ["./_img/canvas/place30/005.png", "./_img/canvas/place30/009_005.png"] }, { "timestamp": 1648837800, "url": ["./_img/canvas/place30/005.png", "./_img/canvas/place30/010_005.png"] }, { "timestamp": 1648839600, "url": ["./_img/canvas/place30/016.png", "./_img/canvas/place30/011_016.png"] }, { "timestamp": 1648841400, "url": ["./_img/canvas/place30/016.png", "./_img/canvas/place30/012_016.png"] }, { "timestamp": 1648843200, "url": ["./_img/canvas/place30/016.png", "./_img/canvas/place30/013_016.png"] }, { "timestamp": 1648845000, "url": ["./_img/canvas/place30/016.png", "./_img/canvas/place30/014_016.png"] }, { "timestamp": 1648846800, "url": ["./_img/canvas/place30/016.png", "./_img/canvas/place30/015_016.png"] }, { "timestamp": 1648848600, "url": "./_img/canvas/place30/016.png" }, { "timestamp": 1648850400, "url": ["./_img/canvas/place30/016.png", "./_img/canvas/place30/017_016.png"] }, { "timestamp": 1648852200, "url": ["./_img/canvas/place30/016.png", "./_img/canvas/place30/018_016.png"] }, { "timestamp": 1648854000, "url": ["./_img/canvas/place30/016.png", "./_img/canvas/place30/019_016.png"] }, { "timestamp": 1648855800, "url": ["./_img/canvas/place30/016.png", "./_img/canvas/place30/020_016.png"] }, { "timestamp": 1648857600, "url": ["./_img/canvas/place30/016.png", "./_img/canvas/place30/021_016.png"] }, { "timestamp": 1648859400, "url": ["./_img/canvas/place30/027.png", "./_img/canvas/place30/022_027.png"] }, { "timestamp": 1648861200, "url": ["./_img/canvas/place30/027.png", "./_img/canvas/place30/023_027.png"] }, { "timestamp": 1648863000, "url": ["./_img/canvas/place30/027.png", "./_img/canvas/place30/024_027.png"] }, { "timestamp": 1648864800, "url": ["./_img/canvas/place30/027.png", "./_img/canvas/place30/025_027.png"] }, { "timestamp": 1648866600, "url": ["./_img/canvas/place30/027.png", "./_img/canvas/place30/026_027.png"] }, { "timestamp": 1648868400, "url": "./_img/canvas/place30/027.png" }, { "timestamp": 1648870200, "url": ["./_img/canvas/place30/027.png", "./_img/canvas/place30/028_027.png"] }, { "timestamp": 1648872000, "url": ["./_img/canvas/place30/027.png", "./_img/canvas/place30/029_027.png"] }, { "timestamp": 1648873800, "url": ["./_img/canvas/place30/027.png", "./_img/canvas/place30/030_027.png"] }, { "timestamp": 1648875600, "url": ["./_img/canvas/place30/027.png", "./_img/canvas/place30/031_027.png"] }, { "timestamp": 1648877400, "url": ["./_img/canvas/place30/027.png", "./_img/canvas/place30/032_027.png"] }, { "timestamp": 1648879200, "url": ["./_img/canvas/place30/038.png", "./_img/canvas/place30/033_038.png"] }, { "timestamp": 1648881000, "url": ["./_img/canvas/place30/038.png", "./_img/canvas/place30/034_038.png"] }, { "timestamp": 1648882800, "url": ["./_img/canvas/place30/038.png", "./_img/canvas/place30/035_038.png"] }, { "timestamp": 1648884600, "url": ["./_img/canvas/place30/038.png", "./_img/canvas/place30/036_038.png"] }, { "timestamp": 1648886400, "url": ["./_img/canvas/place30/038.png", "./_img/canvas/place30/037_038.png"] }, { "timestamp": 16488
	},
	tfc: {
		name: "The Final Clean",
		code: "T",
		default: 0,
		versions: [
			{
				timestamp: "Final",
				url: "./_img/canvas/tfc/final.png",
			},
		]
	}
}

const codeReference = {}
const imageCache = {}

const variantsEl = document.getElementById("variants")

for (const variation in variationsConfig) {
	codeReference[variationsConfig[variation].code] = variation
	const optionEl = document.createElement('option')
	optionEl.value = variation
	optionEl.textContent = variationsConfig[variation].name
	variantsEl.appendChild(optionEl)
}

const timelineSlider = document.getElementById("timeControlsSlider");
const tooltip = document.getElementById("timeControlsTooltip")
const image = document.getElementById("image");
let abortController = new AbortController()
let currentUpdateIndex = 0
let updateTimeout = setTimeout(null, 0)

let currentVariation = "default"
const defaultPeriod = variationsConfig[currentVariation].default
let currentPeriod = defaultPeriod
window.currentPeriod = currentPeriod
window.currentVariation = currentVariation

// SETUP
timelineSlider.max = variationsConfig[currentVariation].versions.length - 1;
timelineSlider.value = currentPeriod;

timelineSlider.addEventListener("input", (event) => {
	updateTooltip(parseInt(event.target.value), currentVariation)
	clearTimeout(updateTimeout)
	updateTimeout = setTimeout(() => {
		updateTime(parseInt(timelineSlider.value), currentVariation)
		setTimeout(() => {
			if (timelineSlider.value != currentPeriod && abortController.signal.aborted) {
				updateTime(parseInt(timelineSlider.value), currentVariation)
			}
		}, 50)
	}, 25)
})

variantsEl.addEventListener("input", (event) => {
	updateTime(currentPeriod, event.target.value)
})

const dispatchTimeUpdateEvent = (period = timelineSlider.value, atlas = atlas) => {
	const timeUpdateEvent = new CustomEvent('timeupdate', {
		detail: {
			period: period,
			atlas: atlas
		}
	});
	document.dispatchEvent(timeUpdateEvent);
}

async function updateBackground(newPeriod = currentPeriod, newVariation = currentVariation) {
	abortController.abort()
	abortController = new AbortController()
	currentUpdateIndex++
	const myUpdateIndex = currentUpdateIndex
	currentPeriod = newPeriod
	const variationConfig = variationsConfig[newVariation]
	if (currentVariation !== newVariation) {
		currentVariation = newVariation
		timelineSlider.max = variationConfig.versions.length - 1;
		currentPeriod = variationConfig.default;
		newPeriod = currentPeriod
		if (variationConfig.versions.length === 1) timelineSlider.parentElement.classList.add('no-time-slider')
		else timelineSlider.parentElement.classList.remove('no-time-slider')
	
	}
	timelineSlider.value = currentPeriod
	variantsEl.value = currentVariation
	const configObject = variationConfig.versions[currentPeriod];
	if (typeof configObject.url === "string") {
		if (imageCache[configObject.url] === undefined) {
			const fetchResult = await fetch(configObject.url, {
				signal: abortController.signal
			});
			if (currentUpdateIndex !== myUpdateIndex) {
				return [configObject, newPeriod, newVariation]
			}
			const imageBlob = await fetchResult.blob()
			imageCache[configObject.url] = URL.createObjectURL(imageBlob)
		}
		image.src = imageCache[configObject.url]
	} else {
		const canvas = document.createElement('canvas')
		const context = canvas.getContext('2d')
		context.canvas.width = 2000
		context.canvas.height = 2000
		await Promise.all(configObject.url.map(async url => {
			if (imageCache[url] === undefined) {
				const fetchResult = await fetch(url, {
					signal: abortController.signal
				});
				if (currentUpdateIndex !== myUpdateIndex) {
					return
				}
				const imageBlob = await fetchResult.blob()
				imageCache[url] = URL.createObjectURL(imageBlob)
			}
		}))
		for await (const url of configObject.url) {
			const imageLayer = new Image()
			await new Promise(resolve => {
				imageLayer.onload = () => {
					context.drawImage(imageLayer, 0, 0)
					resolve()
				}
				imageLayer.src = imageCache[url]
			})
		}

		if (currentUpdateIndex !== myUpdateIndex) return [configObject, newPeriod, newVariation]
		const blob = await new Promise(resolve => canvas.toBlob(resolve))
		image.src = URL.createObjectURL(blob)
	}

	return [configObject, newPeriod, newVariation]
}

async function updateTime(newPeriod = currentPeriod, newVariation = currentVariation) {
	document.body.dataset.canvasLoading = true

	let configObject
	[configObject, newPeriod, newVariation] = await updateBackground(newPeriod, newVariation)

	atlas = []
	for (const atlasIndex in atlasAll) {
		let chosenIndex

		const validPeriods2 = Object.keys(atlasAll[atlasIndex].path)

		for (const i in validPeriods2) {
			const validPeriods = validPeriods2[i].split(', ')
			for (const j in validPeriods) {
				const [start, end, variation] = parsePeriod(validPeriods[j])
				if (isOnPeriod(start, end, variation, newPeriod, newVariation)) {
					chosenIndex = i
					break
				}
			}
			if (chosenIndex !== undefined) break
		}

		if (chosenIndex === undefined) continue
		const pathChosen = Object.values(atlasAll[atlasIndex].path)[chosenIndex]
		const centerChosen = Object.values(atlasAll[atlasIndex].center)[chosenIndex]

		if (pathChosen === undefined) continue

		atlas.push({
			...atlasAll[atlasIndex],
			path: pathChosen,
			center: centerChosen,
		})
	}

	dispatchTimeUpdateEvent(newPeriod, atlas)
	document.body.dataset.canvasLoading = false
}

function updateTooltip(newPeriod, newVariation) {
	const configObject = variationsConfig[newVariation].versions[newPeriod]
	if (typeof configObject.timestamp === "number") tooltip.querySelector('p').textContent = new Date(configObject.timestamp * 1000).toUTCString()
	else tooltip.querySelector('p').textContent = configObject.timestamp
	if (timelineSlider.max === 1) {
		tooltip.style.left = (0 - tooltip.offsetWidth/2) + "px"
	} else {
		tooltip.style.left = (((timelineSlider.offsetWidth)*(timelineSlider.value)/(timelineSlider.max)) - tooltip.offsetWidth/2) + "px"
	}
}

tooltip.parentElement.addEventListener('mouseenter', () => updateTooltip(parseInt(timelineSlider.value), currentVariation))

window.addEventListener('resize', () => updateTooltip(parseInt(timelineSlider.value), currentVariation))

function isOnPeriod(start, end, variation, currentPeriod, currentVariation) {
	return currentPeriod >= start && currentPeriod <= end && variation === currentVariation
}

function parsePeriod(periodString) {
	let variation = "default"
	periodString = periodString + ""
	if (periodString.split(':').length > 1) {
		const split = periodString.split(':')
		variation = codeReference[split[0]]
		periodString = split[1]
	}
	if (periodString.search('-') + 1) {
		const [start, end] = periodString.split('-').map(i => parseInt(i))
		return [start, end, variation]
	} else {
		const periodNew = parseInt(periodString)
		return [periodNew, periodNew, variation]
	}
}