phillip/ingress-intel-total-conversion
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Rewritten tile request calculation

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This commit is contained in:
Paul Tsupikoff
2013-04-24 12:58:31 +03:00
parent 0010626c91
commit f7f8e1ca94
2 changed files with 42 additions and 66 deletions
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40
code/map_data.js
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@ -12,34 +12,30 @@ window.requestData = function() {
requests.abort();
cleanUp();
var magic = convertCenterLat(map.getCenter().lat);
var R = calculateR(magic);
var bounds = map.getBounds();
// convert to point values
topRight = convertLatLngToPoint(bounds.getNorthEast(), magic, R);
bottomLeft = convertLatLngToPoint(bounds.getSouthWest() , magic, R);
// how many quadrants intersect the current view?
quadsX = Math.abs(bottomLeft.x - topRight.x);
quadsY = Math.abs(bottomLeft.y - topRight.y);
var x1 = lngToTile(bounds.getNorthWest().lng, map.getZoom());
var x2 = lngToTile(bounds.getNorthEast().lng, map.getZoom());
var y1 = latToTile(bounds.getNorthWest().lat, map.getZoom());
var y2 = latToTile(bounds.getSouthWest().lat, map.getZoom());
// will group requests by second-last quad-key quadrant
tiles = {};
// walk in x-direction, starts right goes left
for(var i = 0; i <= quadsX; i++) {
var x = Math.abs(topRight.x - i);
var qk = pointToQuadKey(x, topRight.y);
var bnds = convertPointToLatLng(x, topRight.y, magic, R);
if(!tiles[qk.slice(0, -1)]) tiles[qk.slice(0, -1)] = [];
tiles[qk.slice(0, -1)].push(generateBoundsParams(qk, bnds));
// walk in y-direction, starts top, goes down
for(var j = 1; j <= quadsY; j++) {
var qk = pointToQuadKey(x, topRight.y + j);
var bnds = convertPointToLatLng(x, topRight.y + j, magic, R);
if(!tiles[qk.slice(0, -1)]) tiles[qk.slice(0, -1)] = [];
tiles[qk.slice(0, -1)].push(generateBoundsParams(qk, bnds));
for (var x = x1; x <= x2; x++) {
for (var y = y1; y <= y2; y++) {
var tile_id = pointToTileId(map.getZoom(), x, y);
var bucket = Math.floor(x / 2) + "" + Math.floor(y / 2);
if (!tiles[bucket])
tiles[bucket] = [];
tiles[bucket].push(generateBoundsParams(
tile_id,
tileToLat(y + 1, map.getZoom()),
tileToLng(x, map.getZoom()),
tileToLat(y, map.getZoom()),
tileToLng(x + 1, map.getZoom())
));
}
}