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Prioritize tile loading around mouse position

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This commit is contained in:
Tom Payne
2013-03-08 01:04:35 +01:00
parent 1f510d893f
commit d571ef5804
1 changed files with 15 additions and 3 deletions
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18
src/ol/map.js
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@@ -242,6 +242,12 @@ ol.Map = function(mapOptions) {
goog.events.listen(this.viewportSizeMonitor_, goog.events.EventType.RESIZE,
this.handleBrowserWindowResize, false, this);
/**
* @private
* @type {ol.Coordinate}
*/
this.focus_ = null;
/**
* @private
* @type {Array.<ol.PreRenderFunction>}
@@ -487,9 +493,10 @@ ol.Map.prototype.getTilePriority = function(tile, tileSourceKey, tileCenter) {
if (!frameState.wantedTiles[tileSourceKey][coordKey]) {
return ol.TileQueue.DROP;
}
var center = frameState.view2DState.center;
var deltaX = tileCenter.x - center.x;
var deltaY = tileCenter.y - center.y;
var focus = goog.isNull(this.focus_) ?
frameState.view2DState.center : this.focus_;
var deltaX = tileCenter.x - focus.x;
var deltaY = tileCenter.y - focus.y;
return deltaX * deltaX + deltaY * deltaY;
};
@@ -502,6 +509,11 @@ ol.Map.prototype.handleBrowserEvent = function(browserEvent, opt_type) {
var type = opt_type || browserEvent.type;
var mapBrowserEvent = new ol.MapBrowserEvent(type, this, browserEvent);
this.handleMapBrowserEvent(mapBrowserEvent);
if (type == goog.events.EventType.MOUSEOUT) {
this.focus_ = null;
} else {
this.focus_ = mapBrowserEvent.getCoordinate();
}
};