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Diffstat (limited to 'misc/openlayers/lib/OpenLayers/Strategy/BBOX.js')
| -rw-r--r-- | misc/openlayers/lib/OpenLayers/Strategy/BBOX.js | 290 |
1 files changed, 0 insertions, 290 deletions
diff --git a/misc/openlayers/lib/OpenLayers/Strategy/BBOX.js b/misc/openlayers/lib/OpenLayers/Strategy/BBOX.js deleted file mode 100644 index e066764..0000000 --- a/misc/openlayers/lib/OpenLayers/Strategy/BBOX.js +++ /dev/null @@ -1,290 +0,0 @@ -/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for - * full list of contributors). Published under the 2-clause BSD license. - * See license.txt in the OpenLayers distribution or repository for the - * full text of the license. */ - -/** - * @requires OpenLayers/Strategy.js - * @requires OpenLayers/Filter/Spatial.js - */ - -/** - * Class: OpenLayers.Strategy.BBOX - * A simple strategy that reads new features when the viewport invalidates - * some bounds. - * - * Inherits from: - * - <OpenLayers.Strategy> - */ -OpenLayers.Strategy.BBOX = OpenLayers.Class(OpenLayers.Strategy, { - - /** - * Property: bounds - * {<OpenLayers.Bounds>} The current data bounds (in the same projection - * as the layer - not always the same projection as the map). - */ - 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 - * dimension). Default is 2. - */ - 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 - * by the layer protocol. - */ - response: null, - - /** - * Constructor: OpenLayers.Strategy.BBOX - * Create a new BBOX strategy. - * - * Parameters: - * options - {Object} Optional object whose properties will be set on the - * instance. - */ - - /** - * Method: activate - * Set up strategy with regard to reading new batches of remote data. - * - * Returns: - * {Boolean} The strategy was successfully activated. - */ - activate: function() { - var activated = OpenLayers.Strategy.prototype.activate.call(this); - if(activated) { - this.layer.events.on({ - "moveend": this.update, - "refresh": this.update, - "visibilitychanged": this.update, - scope: this - }); - this.update(); - } - return activated; - }, - - /** - * Method: deactivate - * Tear down strategy with regard to reading new batches of remote data. - * - * Returns: - * {Boolean} The strategy was successfully deactivated. - */ - deactivate: function() { - var deactivated = OpenLayers.Strategy.prototype.deactivate.call(this); - if(deactivated) { - this.layer.events.un({ - "moveend": this.update, - "refresh": this.update, - "visibilitychanged": this.update, - scope: this - }); - } - return deactivated; - }, - - /** - * Method: update - * Callback function called on "moveend" or "refresh" layer events. - * - * Parameters: - * options - {Object} Optional object whose properties will determine - * the behaviour of this Strategy - * - * Valid options include: - * force - {Boolean} if true, new data must be unconditionally read. - * noAbort - {Boolean} if true, do not abort previous requests. - */ - update: function(options) { - var mapBounds = this.getMapBounds(); - if (mapBounds !== null && ((options && options.force) || - (this.layer.visibility && this.layer.calculateInRange() && this.invalidBounds(mapBounds)))) { - this.calculateBounds(mapBounds); - this.resolution = this.layer.map.getResolution(); - this.triggerRead(options); - } - }, - - /** - * Method: getMapBounds - * Get the map bounds expressed in the same projection as this layer. - * - * Returns: - * {<OpenLayers.Bounds>} Map bounds in the projection of the layer. - */ - getMapBounds: function() { - if (this.layer.map === null) { - return null; - } - var bounds = this.layer.map.getExtent(); - if(bounds && !this.layer.projection.equals( - this.layer.map.getProjectionObject())) { - bounds = bounds.clone().transform( - this.layer.map.getProjectionObject(), this.layer.projection - ); - } - return bounds; - }, - - /** - * 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 - * retrieved from the map object if not provided - * - * Returns: - * {Boolean} - */ - invalidBounds: function(mapBounds) { - if(!mapBounds) { - mapBounds = this.getMapBounds(); - } - 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; - }, - - /** - * Method: calculateBounds - * - * Parameters: - * mapBounds - {<OpenLayers.Bounds>} the current map extent, will be - * retrieved from the map object if not provided - */ - calculateBounds: function(mapBounds) { - if(!mapBounds) { - mapBounds = this.getMapBounds(); - } - var center = mapBounds.getCenterLonLat(); - var dataWidth = mapBounds.getWidth() * this.ratio; - var dataHeight = mapBounds.getHeight() * this.ratio; - this.bounds = new OpenLayers.Bounds( - center.lon - (dataWidth / 2), - center.lat - (dataHeight / 2), - center.lon + (dataWidth / 2), - center.lat + (dataHeight / 2) - ); - }, - - /** - * Method: triggerRead - * - * Parameters: - * options - {Object} Additional options for the protocol's read method - * (optional) - * - * Returns: - * {<OpenLayers.Protocol.Response>} The protocol response object - * returned by the layer protocol. - */ - triggerRead: function(options) { - if (this.response && !(options && options.noAbort === true)) { - this.layer.protocol.abort(this.response); - this.layer.events.triggerEvent("loadend"); - } - var evt = {filter: this.createFilter()}; - this.layer.events.triggerEvent("loadstart", evt); - this.response = this.layer.protocol.read( - OpenLayers.Util.applyDefaults({ - filter: evt.filter, - callback: this.merge, - scope: this - }, options)); - }, - - /** - * Method: createFilter - * Creates a spatial BBOX filter. If the layer that this strategy belongs - * to has a filter property, this filter will be combined with the BBOX - * filter. - * - * Returns - * {<OpenLayers.Filter>} The filter object. - */ - createFilter: function() { - var filter = new OpenLayers.Filter.Spatial({ - type: OpenLayers.Filter.Spatial.BBOX, - value: this.bounds, - projection: this.layer.projection - }); - if (this.layer.filter) { - filter = new OpenLayers.Filter.Logical({ - type: OpenLayers.Filter.Logical.AND, - filters: [this.layer.filter, filter] - }); - } - return filter; - }, - - /** - * Method: merge - * Given a list of features, determine which ones to add to the layer. - * If the layer projection differs from the map projection, features - * will be transformed from the layer projection to the map projection. - * - * Parameters: - * resp - {<OpenLayers.Protocol.Response>} The response object passed - * by the protocol. - */ - merge: function(resp) { - this.layer.destroyFeatures(); - if (resp.success()) { - var features = resp.features; - if(features && features.length > 0) { - var remote = this.layer.projection; - var local = this.layer.map.getProjectionObject(); - if(!local.equals(remote)) { - var geom; - for(var i=0, len=features.length; i<len; ++i) { - geom = features[i].geometry; - if(geom) { - geom.transform(remote, local); - } - } - } - this.layer.addFeatures(features); - } - } else { - this.bounds = null; - } - this.response = null; - this.layer.events.triggerEvent("loadend", {response: resp}); - }, - - CLASS_NAME: "OpenLayers.Strategy.BBOX" -}); |