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[ol.layer.TileLayer] do not create tiles outside the layer extent

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This commit is contained in:
Éric Lemoine
2012-06-22 17:30:21 +02:00
parent 0c0eecebd9
commit 68fdab6824
2 changed files with 39 additions and 4 deletions
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26
src/ol/layer/TileLayer.js
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@@ -337,7 +337,18 @@ ol.layer.TileLayer.prototype.getTileForXYZ = function(x, y, z) {
.replace('{z}', z + '');
var tile = this.cache_.get(url);
if (!goog.isDef(tile)) {
tile = new this.Tile(url);
var tileOrigin = this.getTileOrigin(),
tileOriginX = tileOrigin[0],
tileOriginY = tileOrigin[1];
var resolution = this.getResolutions()[z];
var tileWidth = this.tileWidth_ * resolution,
tileHeight = this.tileHeight_ * resolution;
var minX = tileOriginX + (x * tileWidth),
minY = tileOriginY - (y * tileHeight),
maxX = minX + tileWidth,
maxY = minY + tileHeight;
var tileBounds = new ol.Bounds(minX, minY, maxX, maxY);
tile = new this.Tile(url, tileBounds);
this.cache_.set(tile.getUrl(), tile);
}
return tile;
@@ -368,13 +379,20 @@ ol.layer.TileLayer.prototype.getData = function(bounds, resolution) {
tileOriginY = tileOrigin[1],
tileWidthGeo = tileWidth * resolution,
tileHeightGeo = tileHeight * resolution,
tileHeightGeo = tileHeight * resolution;
offsetX = Math.floor(
var extent = this.getExtent();
if (extent) {
boundsMinX = Math.max(boundsMinX, extent.getMinX());
boundsMaxX = Math.min(boundsMaxX, extent.getMaxX());
boundsMinY = Math.max(boundsMinY, extent.getMinY());
boundsMaxY = Math.min(boundsMaxY, extent.getMaxY());
}
var offsetX = Math.floor(
(boundsMinX - tileOriginX) / tileWidthGeo),
offsetY = Math.floor(
(tileOriginY - boundsMaxY) / tileHeightGeo),
gridLeft = tileOriginX + tileWidthGeo * offsetX,
gridTop = tileOriginY - tileHeightGeo * offsetY;