mirror of https://github.com/placeAtlas/atlas.git
52 lines
1.6 KiB
JavaScript
52 lines
1.6 KiB
JavaScript
/*!
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* The 2022 r/place Atlas
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* Copyright (c) 2017 Roland Rytz <roland@draemm.li>
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* Copyright (c) 2022 Place Atlas Initiative and contributors
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* Licensed under AGPL-3.0 (https://2022.place-atlas.stefanocoding.me/license.txt)
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*/
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window.addEventListener("error", e => {
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console.error(e)
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let errorMessage = "<h4 class=\"mb-3\">An error has occurred:</h4>"
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errorMessage += "<p class=\"text-danger\">" + e.message + "</p>"
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errorMessage += "<p class=\"text-danger\">on line " + e.lineno + "</p>"
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errorMessage += "<p>If this keeps happening, feel free to tell us on <a href=\"https://discord.gg/pJkm23b2nA\">our Discord server</a>.</p>"
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document.getElementById("loadingContent").innerHTML = errorMessage
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})
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function getPositionOfEntry(entry) {
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let startX = canvasSize.x, startY = canvasSize.y
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for (const [x, y] of entry.path) {
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startX = Math.min(x, startX)
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startY = Math.min(y, startY)
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}
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if (startX === canvasSize.x || startY === canvasSize.y) return null
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return [parseInt(startX), parseInt(startY)]
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}
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const areaMap = new Map()
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// Modified from https://stackoverflow.com/a/33670691
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function calcPolygonArea(vertices) {
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const hit = areaMap.get(vertices)
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if (hit) {
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return hit
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}
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let total = 0
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for (let i = 0, l = vertices.length; i < l; i++) {
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const addX = vertices[i][0]
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const addY = vertices[i === vertices.length - 1 ? 0 : i + 1][1]
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const subX = vertices[i === vertices.length - 1 ? 0 : i + 1][0]
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const subY = vertices[i][1]
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total += (addX * addY * 0.5)
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total -= (subX * subY * 0.5)
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}
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const area = Math.floor(Math.abs(total))
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areaMap.set(vertices, area)
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return area
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} |