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Add EMPTY tile state instead of using null for empty tiles

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This commit is contained in:
Tom Payne
2013-03-08 14:41:14 +01:00
parent 0a13344668
commit b729f969a7
9 changed files with 37 additions and 42 deletions
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16
src/ol/source/imagetilesource.js
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@@ -7,6 +7,7 @@ goog.require('ol.ImageTile');
goog.require('ol.Projection');
goog.require('ol.Tile');
goog.require('ol.TileCache');
goog.require('ol.TileState');
goog.require('ol.TileUrlFunction');
goog.require('ol.TileUrlFunctionType');
goog.require('ol.source.TileSource');
@@ -89,18 +90,17 @@ ol.source.ImageTileSource.prototype.getTile =
function(tileCoord, tileGrid, projection) {
var key = tileCoord.toString();
if (this.tileCache_.containsKey(key)) {
return /** @type {ol.Tile} */ (this.tileCache_.get(key));
return /** @type {!ol.Tile} */ (this.tileCache_.get(key));
} else {
goog.asserts.assert(tileGrid);
goog.asserts.assert(projection);
var tileUrl = this.tileUrlFunction(tileCoord, tileGrid, projection);
var tile;
if (goog.isDef(tileUrl)) {
tile = new ol.ImageTile(tileCoord, tileUrl, this.crossOrigin_);
this.tileCache_.set(key, tile);
} else {
tile = null;
}
var tile = new ol.ImageTile(
tileCoord,
goog.isDef(tileUrl) ? ol.TileState.IDLE : ol.TileState.EMPTY,
goog.isDef(tileUrl) ? tileUrl : '',
this.crossOrigin_);
this.tileCache_.set(key, tile);
return tile;
}
};