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make the first loading sequence of tiles even better

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Matthias Wirth
2020-12-21 17:45:42 +01:00
parent da20ef6062
commit 22ee6febf8
1 changed files with 14 additions and 15 deletions
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29
html/script.js
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@@ -4178,6 +4178,19 @@ function trailReaper() {
}
}
function setIndexDistance(index, center, coords) {
if (index >= 1000) {
globeIndexDist[index] = ol.sphere.getDistance(center, coords);
return;
}
let tile = globeIndexSpecialTiles[index];
let min = ol.sphere.getDistance(center, [tile[1], tile[0]]);
min = Math.min(min, ol.sphere.getDistance(center, [tile[1], tile[2]]));
min = Math.min(min, ol.sphere.getDistance(center, [tile[3], tile[0]]));
min = Math.min(min, ol.sphere.getDistance(center, [tile[3], tile[2]]));
globeIndexDist[index] = min;
}
function globeIndexes() {
const center = ol.proj.toLonLat(OLMap.getView().getCenter());
if (mapIsVisible || lastGlobeExtent == null) {
@@ -4232,7 +4245,7 @@ function globeIndexes() {
let index = globe_index(lat, lon);
//console.log(lat + ' ' + lon + ' ' + index);
if (!indexes.includes(index)) {
globeIndexDist[index] = ol.sphere.getDistance(center, [lon, lat]);
setIndexDistance(index, center, [lon, lat]);
indexes.push(index);
}
}
@@ -4248,20 +4261,6 @@ function globe_index(lat, lon) {
lat = grid * Math.floor((lat + 90) / grid) - 90;
lon = grid * Math.floor((lon + 180) / grid) - 180;
/*
for (let i = 0; i < globeIndexSpecialTiles.length; i++) {
let tile = globeIndexSpecialTiles[i];
if (lat >= tile.south && lat < tile.north) {
if (tile.west < tile.east && lon >= tile.west && lon < tile.east) {
return i;
}
if (tile.west > tile.east && (lon >= tile.west || lon < tile.east)) {
return i;
}
}
}
*/
let i = Math.floor((lat+90) / grid);
let j = Math.floor((lon+180) / grid);