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Discard unwanted tiles from tile queue

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This commit is contained in:
Tom Payne
2013-01-18 16:36:26 +01:00
parent 111b4585a8
commit 1c524caae6
8 changed files with 63 additions and 23 deletions
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24
src/ol/map.js
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@@ -453,19 +453,24 @@ ol.Map.prototype.getOverlayContainer = function() {
/**
* @param {ol.Tile} tile Tile.
* @param {string} tileSourceKey Tile source key.
* @param {ol.Coordinate} tileCenter Tile center.
* @param {number} tileResolution Tile resolution.
* @return {number|undefined} Tile priority.
*/
ol.Map.prototype.getTilePriority = function(tile, tileCenter, tileResolution) {
if (goog.isNull(this.frameState_)) {
ol.Map.prototype.getTilePriority = function(tile, tileSourceKey, tileCenter) {
var frameState = this.frameState_;
if (goog.isNull(frameState) || !(tileSourceKey in frameState.wantedTiles)) {
return undefined;
} else {
var center = this.frameState_.view2DState.center;
var deltaX = tileCenter.x - center.x;
var deltaY = tileCenter.y - center.y;
return Math.sqrt(deltaX * deltaX + deltaY * deltaY) / tileResolution;
}
var zKey = tile.tileCoord.z.toString();
if (!(zKey in frameState.wantedTiles[tileSourceKey]) ||
!frameState.wantedTiles[tileSourceKey][zKey].contains(tile.tileCoord)) {
return undefined;
}
var center = frameState.view2DState.center;
var deltaX = tileCenter.x - center.x;
var deltaY = tileCenter.y - center.y;
return deltaX * deltaX + deltaY * deltaY;
};
@@ -630,7 +635,8 @@ ol.Map.prototype.renderFrame_ = function(time) {
tileUsage: {},
time: time,
view2DState: view2DState,
viewHints: viewHints
viewHints: viewHints,
wantedTiles: {}
};
}