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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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12
src/ol/renderer/canvas/canvastilelayerrenderer.js
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@@ -96,7 +96,6 @@ ol.renderer.canvas.TileLayer.prototype.renderFrame =
var tileLayer = this.getTileLayer();
var tileSource = tileLayer.getTileSource();
var tileSourceKey = goog.getUid(tileSource).toString();
var tileGrid = tileSource.getTileGrid();
if (goog.isNull(tileGrid)) {
tileGrid = ol.tilegrid.getForProjection(projection);
@@ -156,19 +155,14 @@ ol.renderer.canvas.TileLayer.prototype.renderFrame =
tilesToDrawByZ, getTileIfLoaded);
var allTilesLoaded = true;
var tile, tileCenter, tileCoord, tileState, x, y;
var tile, tileCoord, tileState, x, y;
for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
tileCoord = new ol.TileCoord(z, x, y);
tile = tileSource.getTile(tileCoord, tileGrid, projection);
tileState = tile.getState();
if (tileState == ol.TileState.IDLE) {
this.updateWantedTiles(frameState.wantedTiles, tileSource, tileCoord);
tileCenter = tileGrid.getTileCoordCenter(tileCoord);
frameState.tileQueue.enqueue(tile, tileSourceKey, tileCenter);
} else if (tileState == ol.TileState.LOADED ||
tileState == ol.TileState.EMPTY) {
if (tileState == ol.TileState.LOADED || tileState == ol.TileState.EMPTY) {
tilesToDrawByZ[z][tileCoord.toString()] = tile;
continue;
} else if (tileState == ol.TileState.ERROR) {
@@ -246,6 +240,8 @@ ol.renderer.canvas.TileLayer.prototype.renderFrame =
}
this.updateUsedTiles(frameState.usedTiles, tileSource, z, tileRange);
this.manageTilePyramid(
frameState, tileSource, tileGrid, projection, extent, z);
this.scheduleExpireCache(frameState, tileSource);
var transform = this.transform_;