atlas/web/_js/main/stats.js

/*!
 * The 2022 r/place Atlas
 * Copyright (c) 2017 Roland Rytz <roland@draemm.li>
 * Copyright (c) 2022 Place Atlas contributors
 * Licensed under AGPL-3.0 (https://place-atlas.stefanocoding.me/license.txt)
 */

let areasSum = 0
const areas = []

for (const entry of atlas) {

	const path = entry.path

	let area = 0,
		i,
		j,
		point1,
		point2

	for (i = 0, j = path.length - 1; i < path.length; j = i, i++) {
		point1 = path[i]
		point2 = path[j]
		area += point1[0] * point2[1]
		area -= point1[1] * point2[0]
	}

	area = Math.abs(area / 2)

	areasSum += area
	areas.push(area)

	entry.area = area

}

areas.sort((a, b) => a - b)

atlas.sort((a, b) => a.area - b.area)

const el = document.createElement("canvas")
el.style.position = "absolute"
el.style.top = "0px"
el.style.zIndex = "10000"
const ctx = el.getContext("2d")
el.width = 1600
el.height = 500
const steps = 150
const max = 1500

let largerThanMax = areas.reduce((total, area) => total + (area > max), 0)

console.info("There are " + largerThanMax + " entries larger than " + max + ", accounting for " + (largerThanMax / areas.length * 100) + "% of all entries.")
console.info("The largest entry has an area of " + areas[areas.length - 1] + " pixels.")

const counts = [0]
const brackets = [max / steps]

let bracket = 0

let mostCounts = 0

for (const area of areas) {
	if (area > (bracket + 1) * (max / steps)) {
		mostCounts = Math.max(mostCounts, counts[bracket])
		bracket++
		if (bracket >= steps) break
		counts[bracket] = 0
		brackets[bracket] = (bracket + 1) * (max / steps)
	}
	counts[bracket]++
}
//console.log(counts)
//console.log(brackets)
//console.log(mostCounts)

ctx.fillStyle = "#FFFFFF"
ctx.fillRect(0, 0, el.width, el.height)
ctx.strokeStyle = "#F5F5F5"

ctx.fillStyle = "#333333"
ctx.font = "15px sans"
ctx.textAlign = "right"
ctx.textBaseline = "middle"

let linesDistance = 1

for (let i = 0; i <= Math.ceil((mostCounts / linesDistance) / 5) * 5; i++) {
	ctx.beginPath()
	ctx.moveTo(
		50,
		~~(el.height - 50 - i * (linesDistance / mostCounts) * (el.height - 100)) + 0.5
	)
	ctx.lineTo(
		el.width - 25,
		~~(el.height - 50 - i * (linesDistance / mostCounts) * (el.height - 100)) + 0.5
	)
	ctx.stroke()
}

ctx.strokeStyle = "#333333"
linesDistance = 5

for (let i = 0; i <= Math.ceil(mostCounts / linesDistance); i++) {
	ctx.beginPath()
	ctx.moveTo(
		50,
		~~(el.height - 50 - i * (linesDistance / mostCounts) * (el.height - 100)) + 0.5
	)
	ctx.lineTo(
		el.width - 25,
		~~(el.height - 50 - i * (linesDistance / mostCounts) * (el.height - 100)) + 0.5
	)
	ctx.stroke()

	ctx.fillText(
		i * linesDistance,
		40,
		~~(el.height - 50 - i * (linesDistance / mostCounts) * (el.height - 100)) + 0.5
	)
}

const skip = 2

ctx.textAlign = "center"
ctx.textBaseline = "hanging"
ctx.font = "10px sans"

let a = 0
for (let i = 0; i <= counts.length; i++) {
	if (i % skip === 0) {
		let y = 0
		if (a % 2 === 0) {
			y = ~~(el.height - 30) + 0.5
		} else {
			y = ~~(el.height - 45) + 0.5
		}
		a++
		ctx.beginPath()
		ctx.moveTo(
			~~(((i) / steps) * (el.width - 125) + 75) + 0.5,
			~~(el.height - 50) + 0.5
		)
		ctx.lineTo(
			~~(((i) / steps) * (el.width - 125) + 75) + 0.5,
			y
		)
		ctx.stroke()

		ctx.fillText(
			(i) * (max / steps),
			~~(((i) / steps) * (el.width - 125) + 75) - 0.5,
			y + 5
		)
	}
}

ctx.fillStyle = "#FF0000"
ctx.strokeStyle = "#CC0000"

for (let i = 0; i < counts.length; i++) {
	if (i % 2) ctx.fillStyle = "#DD0000"
	else ctx.fillStyle = "#FF0000"

	ctx.fillRect(
		~~((i / steps) * (el.width - 125) + 75),
		el.height - 50,
		Math.ceil(1 / steps * (el.width - 125)),
		~~(-(counts[i] / mostCounts) * (el.height - 100))
	)

	/*ctx.beginPath()
	ctx.moveTo(
		 ~~((i/steps)*(el.width-125)+75)+0.5
		,~~(el.height - 50)
	)
	ctx.lineTo(
		 ~~((i/steps)*(el.width-125)+75)+0.5
		,~~(el.height-(counts[i]/mostCounts)*(el.height-100))-50+0.5
	)
	ctx.lineTo(
		 ~~(((i+1)/steps)*(el.width-125)+75)+0.5
		,~~(el.height-(counts[i]/mostCounts)*(el.height-100))-50+0.5
	)
	ctx.lineTo(
		 ~~(((i+1)/steps)*(el.width-125)+75)+0.5
		,~~(el.height - 50)
	)
	ctx.stroke();*/
}

document.getElementById("wrapper").appendChild(el)

//console.log(areas)

console.info("Median area: " + areas[~~(areas.length / 2)])

console.info("Average area: " + (areasSum / atlas.length))

const topCount = 50
console.info("The " + topCount + " largest entries:")

let outstring = ""

for (let i = 0; i < topCount; i++) {
	outstring += ((i + 1) + "|[" + atlas[atlas.length - i - 1].name + "](http://place-atlas.stefanocoding.me/?id=" + atlas[atlas.length - i - 1].id + ")|" + ~~atlas[atlas.length - i - 1].area + "|" + Math.round(atlas[atlas.length - i - 1].area / 100) / 100 + "%\n")
}

console.info(outstring)

atlas.sort((a, b) => a.center[0] - b.center[0])
console.info("Median x: " + atlas[~~(atlas.length / 2)].center[0])

atlas.sort((a, b) => a.center[1] - b.center[1])
console.info("Median y: " + atlas[~~(atlas.length / 2)].center[1])