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handle elevation tile request failure

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vcoppe
2024-09-05 09:41:14 +02:00
parent f846b03e74
commit 7d801be682
1 changed files with 12 additions and 9 deletions
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21
website/src/lib/utils.ts
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@@ -100,23 +100,28 @@ export function getElevation(points: (TrackPoint | Waypoint | Coordinates)[], EL
let tiles = coordinates.map((coord) => tilebelt.pointToTile(coord.lon, coord.lat, ELEVATION_ZOOM));
let uniqueTiles = Array.from(new Set(tiles.map((tile) => tile.join(',')))).map((tile) => tile.split(',').map((x) => parseInt(x)));
let pngs = new Map<string, PNGReader>();
let pngs = new Map<string, any>();
let promises = uniqueTiles.map((tile) => fetch(`https://api.mapbox.com/v4/mapbox.mapbox-terrain-dem-v1/${ELEVATION_ZOOM}/${tile[0]}/${tile[1]}@2x.pngraw?access_token=${PUBLIC_MAPBOX_TOKEN}`, { cache: 'force-cache' }).then((response) => response.arrayBuffer()).then((buffer) => new Promise((resolve, reject) => {
let promises = uniqueTiles.map((tile) => fetch(`https://api.mapbox.com/v4/mapbox.mapbox-terrain-dem-v1/${ELEVATION_ZOOM}/${tile[0]}/${tile[1]}@2x.pngraw?access_token=${PUBLIC_MAPBOX_TOKEN}`, { cache: 'force-cache' }).then((response) => response.arrayBuffer()).then((buffer) => new Promise((resolve) => {
let png = new PNGReader(new Uint8Array(buffer));
png.parse((err, png) => {
if (err) {
reject(err);
resolve(false); // Also resolve so that Promise.all doesn't fail
} else {
resolve(png);
pngs.set(tile.join(','), png);
resolve(true);
}
});
})).then((png) => {
pngs.set(tile.join(','), png);
}));
})));
return Promise.all(promises).then(() => coordinates.map((coord, index) => {
let tile = tiles[index];
let png = pngs.get(tile.join(','));
if (!png) {
return 0;
}
let tf = tilebelt.pointToTileFraction(coord.lon, coord.lat, ELEVATION_ZOOM);
let x = tileSize * (tf[0] - tile[0]);
let y = tileSize * (tf[1] - tile[1]);
@@ -125,8 +130,6 @@ export function getElevation(points: (TrackPoint | Waypoint | Coordinates)[], EL
let dx = x - _x;
let dy = y - _y;
// Get the four pixels surrounding the point
let png = pngs.get(tile.join(','))!;
const p00 = png.getPixel(_x, _y);
const p01 = png.getPixel(_x, _y + (_y + 1 == tileSize ? 0 : 1));
const p10 = png.getPixel(_x + (_x + 1 == tileSize ? 0 : 1), _y);