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Diffstat (limited to 'misc/openlayers/lib/OpenLayers/Tile/UTFGrid.js')
| -rw-r--r-- | misc/openlayers/lib/OpenLayers/Tile/UTFGrid.js | 252 |
1 files changed, 0 insertions, 252 deletions
diff --git a/misc/openlayers/lib/OpenLayers/Tile/UTFGrid.js b/misc/openlayers/lib/OpenLayers/Tile/UTFGrid.js deleted file mode 100644 index 2836ee0..0000000 --- a/misc/openlayers/lib/OpenLayers/Tile/UTFGrid.js +++ /dev/null @@ -1,252 +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/Tile.js - * @requires OpenLayers/Format/JSON.js - * @requires OpenLayers/Request.js - */ - -/** - * Class: OpenLayers.Tile.UTFGrid - * Instances of OpenLayers.Tile.UTFGrid are used to manage - * UTFGrids. This is an unusual tile type in that it doesn't have a - * rendered image; only a 'hit grid' that can be used to - * look up feature attributes. - * - * See the <OpenLayers.Tile.UTFGrid> constructor for details on constructing a - * new instance. - * - * Inherits from: - * - <OpenLayers.Tile> - */ -OpenLayers.Tile.UTFGrid = OpenLayers.Class(OpenLayers.Tile, { - - /** - * Property: url - * {String} - * The URL of the UTFGrid file being requested. Provided by the <getURL> - * method. - */ - url: null, - - /** - * Property: utfgridResolution - * {Number} - * Ratio of the pixel width to the width of a UTFGrid data point. If an - * entry in the grid represents a 4x4 block of pixels, the - * utfgridResolution would be 4. Default is 2. - */ - utfgridResolution: 2, - - /** - * Property: json - * {Object} - * Stores the parsed JSON tile data structure. - */ - json: null, - - /** - * Property: format - * {OpenLayers.Format.JSON} - * Parser instance used to parse JSON for cross browser support. The native - * JSON.parse method will be used where available (all except IE<8). - */ - format: null, - - /** - * Constructor: OpenLayers.Tile.UTFGrid - * Constructor for a new <OpenLayers.Tile.UTFGrid> instance. - * - * Parameters: - * layer - {<OpenLayers.Layer>} layer that the tile will go in. - * position - {<OpenLayers.Pixel>} - * bounds - {<OpenLayers.Bounds>} - * url - {<String>} Deprecated. Remove me in 3.0. - * size - {<OpenLayers.Size>} - * options - {Object} - */ - - /** - * APIMethod: destroy - * Clean up. - */ - destroy: function() { - this.clear(); - OpenLayers.Tile.prototype.destroy.apply(this, arguments); - }, - - /** - * Method: draw - * Check that a tile should be drawn, and draw it. - * In the case of UTFGrids, "drawing" it means fetching and - * parsing the json. - * - * Returns: - * {Boolean} Was a tile drawn? - */ - draw: function() { - var drawn = OpenLayers.Tile.prototype.draw.apply(this, arguments); - if (drawn) { - if (this.isLoading) { - this.abortLoading(); - //if we're already loading, send 'reload' instead of 'loadstart'. - this.events.triggerEvent("reload"); - } else { - this.isLoading = true; - this.events.triggerEvent("loadstart"); - } - this.url = this.layer.getURL(this.bounds); - - if (this.layer.useJSONP) { - // Use JSONP method to avoid xbrowser policy - var ols = new OpenLayers.Protocol.Script({ - url: this.url, - callback: function(response) { - this.isLoading = false; - this.events.triggerEvent("loadend"); - this.json = response.data; - }, - scope: this - }); - ols.read(); - this.request = ols; - } else { - // Use standard XHR - this.request = OpenLayers.Request.GET({ - url: this.url, - callback: function(response) { - this.isLoading = false; - this.events.triggerEvent("loadend"); - if (response.status === 200) { - this.parseData(response.responseText); - } - }, - scope: this - }); - } - } else { - this.unload(); - } - return drawn; - }, - - /** - * Method: abortLoading - * Cancel a pending request. - */ - abortLoading: function() { - if (this.request) { - this.request.abort(); - delete this.request; - } - this.isLoading = false; - }, - - /** - * Method: getFeatureInfo - * Get feature information associated with a pixel offset. If the pixel - * offset corresponds to a feature, the returned object will have id - * and data properties. Otherwise, null will be returned. - * - * - * Parameters: - * i - {Number} X-axis pixel offset (from top left of tile) - * j - {Number} Y-axis pixel offset (from top left of tile) - * - * Returns: - * {Object} Object with feature id and data properties corresponding to the - * given pixel offset. - */ - getFeatureInfo: function(i, j) { - var info = null; - if (this.json) { - var id = this.getFeatureId(i, j); - if (id !== null) { - info = {id: id, data: this.json.data[id]}; - } - } - return info; - }, - - /** - * Method: getFeatureId - * Get the identifier for the feature associated with a pixel offset. - * - * Parameters: - * i - {Number} X-axis pixel offset (from top left of tile) - * j - {Number} Y-axis pixel offset (from top left of tile) - * - * Returns: - * {Object} The feature identifier corresponding to the given pixel offset. - * Returns null if pixel doesn't correspond to a feature. - */ - getFeatureId: function(i, j) { - var id = null; - if (this.json) { - var resolution = this.utfgridResolution; - var row = Math.floor(j / resolution); - var col = Math.floor(i / resolution); - var charCode = this.json.grid[row].charCodeAt(col); - var index = this.indexFromCharCode(charCode); - var keys = this.json.keys; - if (!isNaN(index) && (index in keys)) { - id = keys[index]; - } - } - return id; - }, - - /** - * Method: indexFromCharCode - * Given a character code for one of the UTFGrid "grid" characters, - * resolve the integer index for the feature id in the UTFGrid "keys" - * array. - * - * Parameters: - * charCode - {Integer} - * - * Returns: - * {Integer} Index for the feature id from the keys array. - */ - indexFromCharCode: function(charCode) { - if (charCode >= 93) { - charCode--; - } - if (charCode >= 35) { - charCode --; - } - return charCode - 32; - }, - - /** - * Method: parseData - * Parse the JSON from a request - * - * Parameters: - * str - {String} UTFGrid as a JSON string. - * - * Returns: - * {Object} parsed javascript data - */ - parseData: function(str) { - if (!this.format) { - this.format = new OpenLayers.Format.JSON(); - } - this.json = this.format.read(str); - }, - - /** - * Method: clear - * Delete data stored with this tile. - */ - clear: function() { - this.json = null; - }, - - CLASS_NAME: "OpenLayers.Tile.UTFGrid" - -}); |