phillip/ingress-intel-total-conversion
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sort the queued tiles by the distance from the centre of the screen

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this mirrors the changes to the stock intel site as of 2014-01-13 (and is something i'd been considering before they did this)
This commit is contained in:
Jon Atkins 2014-01-13 22:25:18 +00:00
parent 44f1df47f9
commit 05cd342051
1 changed files with 32 additions and 4 deletions
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36
code/map_data_request.js
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@ -177,6 +177,9 @@ window.MapDataRequest.prototype.refresh = function() {
this.tileErrorCount = {};
// the 'set' of requested tile QKs
// NOTE: javascript does not guarantee any order to properties of an object. however, in all major implementations
// properties retain the order they are added in. IITC uses this to control the tile fetch order. if browsers change
// then fetch order isn't optimal, but it won't break things.
this.queuedTiles = {};
@ -228,6 +231,11 @@ window.MapDataRequest.prototype.refresh = function() {
this.failedTileCount = 0;
this.staleTileCount = 0;
var tilesToFetchDistance = {};
// map center point - for fetching center tiles first
var mapCenterPoint = map.project(map.getCenter(), zoom);
// y goes from left to right
for (var y = y1; y <= y2; y++) {
// x goes from bottom to top(?)
@ -255,15 +263,35 @@ window.MapDataRequest.prototype.refresh = function() {
this.render.processTileData (old_data);
}
// queue a request
this.queuedTiles[tile_id] = tile_id;
// tile needed. calculate the distance from the centre of the screen, to optimise the load order
var latCenter = (latNorth+latSouth)/2;
var lngCenter = (lngEast+lngWest)/2;
var tileLatLng = L.latLng(latCenter,lngCenter);
var tilePoint = map.project(tileLatLng, zoom);
var delta = mapCenterPoint.subtract(tilePoint);
var distanceSquared = delta.x*delta.x + delta.y*delta.y;
tilesToFetchDistance[tile_id] = distanceSquared;
this.requestedTileCount += 1;
}
}
}
//TODO: the stock intel site now orders tiles based on distance from the centre of the map, to get relevent
//data loaded sooner. IITC should do the same...
// re-order the tile list by distance from the centre of the screen. this should load more relevant data first
var tilesToFetch = Object.keys(tilesToFetchDistance);
tilesToFetch.sort(function(a,b) {
return tilesToFetchDistance[a]-tilesToFetchDistance[b];
});
for (var i in tilesToFetch) {
var qk = tilesToFetch[i];
this.queuedTiles[qk] = qk;
}
this.setStatus ('loading', undefined, -1);