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Adding an option to make the bbox strategy more agressive. Thanks for completing the tests crschmidt. r=crschmidt,igrcic (closes #1830)

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@9087 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
Tim Schaub
2009-03-18 17:42:14 +00:00
parent eb03ccc02d
commit baf260c6f1
2 changed files with 59 additions and 1 deletions
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33
lib/OpenLayers/Strategy/BBOX.js
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@@ -24,6 +24,12 @@ OpenLayers.Strategy.BBOX = OpenLayers.Class(OpenLayers.Strategy, {
*/
bounds: null,
/**
* Property: resolution
* {Float} The current data resolution.
*/
resolution: null,
/**
* APIProperty: ratio
* {Float} The ratio of the data bounds to the viewport bounds (in each
@@ -31,6 +37,21 @@ OpenLayers.Strategy.BBOX = OpenLayers.Class(OpenLayers.Strategy, {
*/
ratio: 2,
/**
* Property: resFactor
* {Float} Optional factor used to determine when previously requested
* features are invalid. If set, the resFactor will be compared to the
* resolution of the previous request to the current map resolution.
* If resFactor > (old / new) and 1/resFactor < (old / new). If you
* set a resFactor of 1, data will be requested every time the
* resolution changes. If you set a resFactor of 3, data will be
* requested if the old resolution is 3 times the new, or if the new is
* 3 times the old. If the old bounds do not contain the new bounds
* new data will always be requested (with or without considering
* resFactor).
*/
resFactor: null,
/**
* Property: response
* {<OpenLayers.Protocol.Response>} The protocol response object returned
@@ -107,6 +128,7 @@ OpenLayers.Strategy.BBOX = OpenLayers.Class(OpenLayers.Strategy, {
var mapBounds = this.getMapBounds();
if ((options && options.force) || this.invalidBounds(mapBounds)) {
this.calculateBounds(mapBounds);
this.resolution = this.layer.map.getResolution();
this.triggerRead();
}
},
@@ -130,6 +152,10 @@ OpenLayers.Strategy.BBOX = OpenLayers.Class(OpenLayers.Strategy, {
/**
* Method: invalidBounds
* Determine whether the previously requested set of features is invalid.
* This occurs when the new map bounds do not contain the previously
* requested bounds. In addition, if <resFactor> is set, it will be
* considered.
*
* Parameters:
* mapBounds - {<OpenLayers.Bounds>} the current map extent, will be
@@ -142,7 +168,12 @@ OpenLayers.Strategy.BBOX = OpenLayers.Class(OpenLayers.Strategy, {
if(!mapBounds) {
mapBounds = this.getMapBounds();
}
return !this.bounds || !this.bounds.containsBounds(mapBounds);
var invalid = !this.bounds || !this.bounds.containsBounds(mapBounds);
if(!invalid && this.resFactor) {
var ratio = this.resolution / this.layer.map.getResolution();
invalid = (ratio >= this.resFactor || ratio <= (1 / this.resFactor));
}
return invalid;
},
/**