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Premptively load low resolution tiles

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This commit is contained in:
Tom Payne
2013-03-12 18:04:28 +01:00
parent e3abe376f1
commit 80df629319
6 changed files with 86 additions and 46 deletions
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19
src/ol/tilequeue.js
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@@ -20,7 +20,7 @@ goog.require('ol.TileState');
/**
* @typedef {function(ol.Tile, string, ol.Coordinate): number}
* @typedef {function(ol.Tile, string, ol.Coordinate, number): number}
*/
ol.TilePriorityFunction;
@@ -106,16 +106,20 @@ ol.TileQueue.prototype.dequeue_ = function() {
* @param {ol.Tile} tile Tile.
* @param {string} tileSourceKey Tile source key.
* @param {ol.Coordinate} tileCenter Tile center.
* @param {number} tileResolution Tile resolution.
*/
ol.TileQueue.prototype.enqueue = function(tile, tileSourceKey, tileCenter) {
ol.TileQueue.prototype.enqueue = function(
tile, tileSourceKey, tileCenter, tileResolution) {
if (tile.getState() != ol.TileState.IDLE) {
return;
}
var tileKey = tile.getKey();
if (!(tileKey in this.queuedTileKeys_)) {
var priority = this.tilePriorityFunction_(tile, tileSourceKey, tileCenter);
var priority = this.tilePriorityFunction_(
tile, tileSourceKey, tileCenter, tileResolution);
if (priority != ol.TileQueue.DROP) {
this.heap_.push([priority, tile, tileSourceKey, tileCenter]);
this.heap_.push(
[priority, tile, tileSourceKey, tileCenter, tileResolution]);
this.queuedTileKeys_[tileKey] = true;
this.siftDown_(0, this.heap_.length - 1);
}
@@ -245,13 +249,16 @@ ol.TileQueue.prototype.siftDown_ = function(startIndex, index) {
*/
ol.TileQueue.prototype.reprioritize = function() {
var heap = this.heap_;
var i, n = 0, node, priority, tile, tileCenter, tileKey, tileSourceKey;
var i, n = 0, node, priority;
var tile, tileCenter, tileKey, tileResolution, tileSourceKey;
for (i = 0; i < heap.length; ++i) {
node = heap[i];
tile = /** @type {ol.Tile} */ (node[1]);
tileSourceKey = /** @type {string} */ (node[2]);
tileCenter = /** @type {ol.Coordinate} */ (node[3]);
priority = this.tilePriorityFunction_(tile, tileSourceKey, tileCenter);
tileResolution = /** @type {number} */ (node[4]);
priority = this.tilePriorityFunction_(
tile, tileSourceKey, tileCenter, tileResolution);
if (priority == ol.TileQueue.DROP) {
tileKey = tile.getKey();
delete this.queuedTileKeys_[tileKey];