colouring-montreal/app/src/tiles/util.ts

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import SphericalMercator from '@mapbox/sphericalmercator';
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import { BoundingBox, TileParams } from './types';
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const TILE_SIZE = 256;
const mercator = new SphericalMercator({
size: TILE_SIZE
});
function getBbox(z, x, y) {
return mercator.bbox(x, y, z, false, '900913');
}
function getXYZ(bbox, z) {
return mercator.xyz(bbox, z, false, '900913')
}
function formatParams({ tileset, z, x, y, scale }: TileParams): string {
return `${tileset}/${z}/${x}/${y}@${scale}x`;
}
function isOutsideExtent({ x, y, z }: TileParams, bbox: BoundingBox) {
const xy = getXYZ(bbox, z);
return xy.minY > y || xy.maxY < y || xy.minX > x || xy.maxX < x;
}
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export {
TILE_SIZE,
getBbox,
getXYZ,
formatParams,
isOutsideExtent
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};