atlas/web/_js/overlap.js

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/*
========================================================================
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
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https://place-atlas.stefanocoding.me/license.txt
========================================================================
*/
function initOverlap() {
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window.renderBackground = renderBackground
const hovered = [];
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buildObjectsList(null, null);
renderBackground(atlas);
render();
document.addEventListener('timeupdate', (event) => {
sortedAtlas = atlas.concat()
resetEntriesList(null, null)
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renderBackground(sortedAtlas);
render();
})
applyView();
render();
updateLines();
if (window.location.hash) {
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highlightEntryFromUrl();
}
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function renderBackground(atlas) {
backgroundContext.clearRect(0, 0, canvas.width, canvas.height);
backgroundContext.fillStyle = "rgba(255, 255, 255, 1)";
backgroundContext.fillRect(0, 0, canvas.width, canvas.height);
for (let i = 0; i < atlas.length; i++) {
const path = atlas[i].path;
backgroundContext.beginPath();
if (path[0]) {
backgroundContext.moveTo(path[0][0], path[0][1]);
}
for (let p = 1; p < path.length; p++) {
backgroundContext.lineTo(path[p][0], path[p][1]);
}
backgroundContext.closePath();
backgroundContext.fillStyle = "rgba(0, 0, 255, 0.2)";
backgroundContext.fill();
}
const pixels = backgroundContext.getImageData(0, 0, backgroundCanvas.width, backgroundCanvas.height).data;
let blank = 0;
for (let i = 0; i < pixels.length; i += 4) {
if (pixels[i] == 255) {
blank++;
}
}
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const blankPercentage = (blank / (2000 * 2000)) * 100
console.info(blank + " blank pixels, which are " + blankPercentage.toPrecision(4) + "% of the canvas (" + (100 - blankPercentage).toPrecision(4) + "% mapped)");
}
}