[76] | 1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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| 2 | * full list of contributors). Published under the Clear BSD license. |
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| 3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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| 4 | * full text of the license. */ |
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| 5 | |
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| 6 | /** |
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| 7 | * @requires OpenLayers/Request/XMLHttpRequest.js |
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| 8 | * @requires OpenLayers/Layer/Grid.js |
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| 9 | */ |
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| 10 | |
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| 11 | /** |
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| 12 | * Class: OpenLayers.Layer.MapGuide |
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| 13 | * Instances of OpenLayers.Layer.MapGuide are used to display |
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| 14 | * data from a MapGuide OS instance. |
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| 15 | * |
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| 16 | * Inherits from: |
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| 17 | * - <OpenLayers.Layer.Grid> |
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| 18 | */ |
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| 19 | OpenLayers.Layer.MapGuide = OpenLayers.Class(OpenLayers.Layer.Grid, { |
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| 20 | |
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| 21 | /** |
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| 22 | * APIProperty: isBaseLayer |
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| 23 | * {Boolean} Treat this layer as a base layer. Default is true. |
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| 24 | **/ |
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| 25 | isBaseLayer: true, |
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| 26 | |
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| 27 | /** |
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| 28 | * APIProperty: useHttpTile |
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| 29 | * {Boolean} use a tile cache exposed directly via a webserver rather than the |
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| 30 | * via mapguide server. This does require extra configuration on the Mapguide Server, |
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| 31 | * and will only work when singleTile is false. The url for the layer must be set to the |
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| 32 | * webserver path rather than the Mapguide mapagent. |
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| 33 | * See http://trac.osgeo.org/mapguide/wiki/CodeSamples/Tiles/ServingTilesViaHttp |
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| 34 | **/ |
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| 35 | useHttpTile: false, |
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| 36 | |
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| 37 | /** |
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| 38 | * APIProperty: singleTile |
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| 39 | * {Boolean} use tile server or request single tile image. |
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| 40 | **/ |
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| 41 | singleTile: false, |
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| 42 | |
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| 43 | /** |
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| 44 | * APIProperty: useOverlay |
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| 45 | * {Boolean} flag to indicate if the layer should be retrieved using |
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| 46 | * GETMAPIMAGE (default) or using GETDYNAMICOVERLAY requests. |
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| 47 | **/ |
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| 48 | useOverlay: false, |
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| 49 | |
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| 50 | /** |
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| 51 | * APIProperty: useAsyncOverlay |
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| 52 | * {Boolean} indicates if the MapGuide site supports the asynchronous |
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| 53 | * GETDYNAMICOVERLAY requests which is available in MapGuide Enterprise 2010 |
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| 54 | * and MapGuide Open Source v2.0.3 or higher. The newer versions of MG |
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| 55 | * is called asynchronously, allows selections to be drawn separately from |
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| 56 | * the map and offers styling options. |
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| 57 | * |
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| 58 | * With older versions of MapGuide, set useAsyncOverlay=false. Note that in |
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| 59 | * this case a synchronous AJAX call is issued and the mapname and session |
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| 60 | * parameters must be used to initialize the layer, not the mapdefinition |
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| 61 | * parameter. Also note that this will issue a synchronous AJAX request |
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| 62 | * before the image request can be issued so the users browser may lock |
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| 63 | * up if the MG Web tier does not respond in a timely fashion. |
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| 64 | **/ |
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| 65 | useAsyncOverlay: true, |
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| 66 | |
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| 67 | /** |
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| 68 | * Constant: TILE_PARAMS |
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| 69 | * {Object} Hashtable of default parameter key/value pairs for tiled layer |
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| 70 | */ |
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| 71 | TILE_PARAMS: { |
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| 72 | operation: 'GETTILEIMAGE', |
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| 73 | version: '1.2.0' |
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| 74 | }, |
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| 75 | |
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| 76 | /** |
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| 77 | * Constant: SINGLE_TILE_PARAMS |
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| 78 | * {Object} Hashtable of default parameter key/value pairs for untiled layer |
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| 79 | */ |
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| 80 | SINGLE_TILE_PARAMS: { |
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| 81 | operation: 'GETMAPIMAGE', |
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| 82 | format: 'PNG', |
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| 83 | locale: 'en', |
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| 84 | clip: '1', |
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| 85 | version: '1.0.0' |
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| 86 | }, |
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| 87 | |
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| 88 | /** |
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| 89 | * Constant: OVERLAY_PARAMS |
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| 90 | * {Object} Hashtable of default parameter key/value pairs for untiled layer |
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| 91 | */ |
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| 92 | OVERLAY_PARAMS: { |
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| 93 | operation: 'GETDYNAMICMAPOVERLAYIMAGE', |
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| 94 | format: 'PNG', |
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| 95 | locale: 'en', |
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| 96 | clip: '1', |
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| 97 | version: '2.0.0' |
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| 98 | }, |
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| 99 | |
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| 100 | /** |
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| 101 | * Constant: FOLDER_PARAMS |
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| 102 | * {Object} Hashtable of parameter key/value pairs which describe |
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| 103 | * the folder structure for tiles as configured in the mapguide |
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| 104 | * serverconfig.ini section [TileServiceProperties] |
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| 105 | */ |
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| 106 | FOLDER_PARAMS: { |
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| 107 | tileColumnsPerFolder: 30, |
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| 108 | tileRowsPerFolder: 30, |
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| 109 | format: 'png', |
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| 110 | querystring: null |
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| 111 | }, |
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| 112 | |
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| 113 | /** |
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| 114 | * Property: defaultSize |
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| 115 | * {<OpenLayers.Size>} Tile size as produced by MapGuide server |
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| 116 | **/ |
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| 117 | defaultSize: new OpenLayers.Size(300,300), |
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| 118 | |
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| 119 | /** |
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| 120 | * Constructor: OpenLayers.Layer.MapGuide |
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| 121 | * Create a new Mapguide layer, either tiled or untiled. |
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| 122 | * |
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| 123 | * For tiled layers, the 'groupName' and 'mapDefinition' values |
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| 124 | * must be specified as parameters in the constructor. |
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| 125 | * |
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| 126 | * For untiled base layers, specify either combination of 'mapName' and |
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| 127 | * 'session', or 'mapDefinition' and 'locale'. |
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| 128 | * |
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| 129 | * For older versions of MapGuide and overlay layers, set useAsyncOverlay |
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| 130 | * to false and in this case mapName and session are required parameters |
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| 131 | * for the constructor. |
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| 132 | * |
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| 133 | * NOTE: MapGuide OS uses a DPI value and degrees to meters conversion |
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| 134 | * factor that are different than the defaults used in OpenLayers, |
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| 135 | * so these must be adjusted accordingly in your application. |
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| 136 | * See the MapGuide example for how to set these values for MGOS. |
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| 137 | * |
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| 138 | * Parameters: |
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| 139 | * name - {String} Name of the layer displayed in the interface |
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| 140 | * url - {String} Location of the MapGuide mapagent executable |
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| 141 | * (e.g. http://localhost:8008/mapguide/mapagent/mapagent.fcgi) |
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| 142 | * params - {Object} hashtable of additional parameters to use. Some |
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| 143 | * parameters may require additional code on the server. The ones that |
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| 144 | * you may want to use are: |
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| 145 | * - mapDefinition - {String} The MapGuide resource definition |
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| 146 | * (e.g. Library://Samples/Gmap/Maps/gmapTiled.MapDefinition) |
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| 147 | * - locale - Locale setting |
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| 148 | * (for untiled overlays layers only) |
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| 149 | * - mapName - {String} Name of the map as stored in the MapGuide session. |
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| 150 | * (for untiled layers with a session parameter only) |
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| 151 | * - session - { String} MapGuide session ID |
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| 152 | * (for untiled overlays layers only) |
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| 153 | * - basemaplayergroupname - {String} GroupName for tiled MapGuide layers only |
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| 154 | * - format - Image format to be returned (for untiled overlay layers only) |
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| 155 | * - showLayers - {String} A comma separated list of GUID's for the |
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| 156 | * layers to display eg: 'cvc-xcv34,453-345-345sdf'. |
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| 157 | * - hideLayers - {String} A comma separated list of GUID's for the |
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| 158 | * layers to hide eg: 'cvc-xcv34,453-345-345sdf'. |
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| 159 | * - showGroups - {String} A comma separated list of GUID's for the |
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| 160 | * groups to display eg: 'cvc-xcv34,453-345-345sdf'. |
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| 161 | * - hideGroups - {String} A comma separated list of GUID's for the |
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| 162 | * groups to hide eg: 'cvc-xcv34,453-345-345sdf' |
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| 163 | * - selectionXml - {String} A selection xml string Some server plumbing |
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| 164 | * is required to read such a value. |
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| 165 | * options - {Ojbect} Hashtable of extra options to tag onto the layer; |
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| 166 | * will vary depending if tiled or untiled maps are being requested |
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| 167 | */ |
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| 168 | initialize: function(name, url, params, options) { |
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| 169 | |
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| 170 | OpenLayers.Layer.Grid.prototype.initialize.apply(this, arguments); |
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| 171 | |
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| 172 | // unless explicitly set in options, if the layer is transparent, |
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| 173 | // it will be an overlay |
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| 174 | if (options == null || options.isBaseLayer == null) { |
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| 175 | this.isBaseLayer = ((this.transparent != "true") && |
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| 176 | (this.transparent != true)); |
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| 177 | } |
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| 178 | |
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| 179 | if (options && options.useOverlay!=null) { |
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| 180 | this.useOverlay = options.useOverlay; |
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| 181 | } |
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| 182 | |
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| 183 | //initialize for untiled layers |
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| 184 | if (this.singleTile) { |
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| 185 | if (this.useOverlay) { |
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| 186 | OpenLayers.Util.applyDefaults( |
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| 187 | this.params, |
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| 188 | this.OVERLAY_PARAMS |
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| 189 | ); |
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| 190 | if (!this.useAsyncOverlay) { |
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| 191 | this.params.version = "1.0.0"; |
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| 192 | } |
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| 193 | } else { |
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| 194 | OpenLayers.Util.applyDefaults( |
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| 195 | this.params, |
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| 196 | this.SINGLE_TILE_PARAMS |
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| 197 | ); |
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| 198 | } |
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| 199 | } else { |
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| 200 | //initialize for tiled layers |
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| 201 | if (this.useHttpTile) { |
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| 202 | OpenLayers.Util.applyDefaults( |
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| 203 | this.params, |
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| 204 | this.FOLDER_PARAMS |
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| 205 | ); |
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| 206 | } else { |
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| 207 | OpenLayers.Util.applyDefaults( |
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| 208 | this.params, |
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| 209 | this.TILE_PARAMS |
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| 210 | ); |
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| 211 | } |
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| 212 | this.setTileSize(this.defaultSize); |
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| 213 | } |
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| 214 | }, |
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| 215 | |
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| 216 | /** |
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| 217 | * Method: clone |
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| 218 | * Create a clone of this layer |
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| 219 | * |
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| 220 | * Returns: |
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| 221 | * {<OpenLayers.Layer.MapGuide>} An exact clone of this layer |
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| 222 | */ |
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| 223 | clone: function (obj) { |
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| 224 | if (obj == null) { |
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| 225 | obj = new OpenLayers.Layer.MapGuide(this.name, |
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| 226 | this.url, |
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| 227 | this.params, |
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| 228 | this.getOptions()); |
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| 229 | } |
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| 230 | //get all additions from superclasses |
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| 231 | obj = OpenLayers.Layer.Grid.prototype.clone.apply(this, [obj]); |
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| 232 | |
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| 233 | return obj; |
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| 234 | }, |
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| 235 | |
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| 236 | /** |
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| 237 | * Method: addTile |
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| 238 | * Creates a tile, initializes it, and adds it to the layer div. |
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| 239 | * |
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| 240 | * Parameters: |
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| 241 | * bounds - {<OpenLayers.Bounds>} |
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| 242 | * position - {<OpenLayers.Pixel>} |
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| 243 | * |
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| 244 | * Returns: |
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| 245 | * {<OpenLayers.Tile.Image>} The added OpenLayers.Tile.Image |
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| 246 | */ |
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| 247 | addTile:function(bounds,position) { |
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| 248 | return new OpenLayers.Tile.Image(this, position, bounds, |
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| 249 | null, this.tileSize); |
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| 250 | }, |
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| 251 | |
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| 252 | /** |
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| 253 | * Method: getURL |
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| 254 | * Return a query string for this layer |
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| 255 | * |
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| 256 | * Parameters: |
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| 257 | * bounds - {<OpenLayers.Bounds>} A bounds representing the bbox |
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| 258 | * for the request |
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| 259 | * |
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| 260 | * Returns: |
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| 261 | * {String} A string with the layer's url and parameters and also |
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| 262 | * the passed-in bounds and appropriate tile size specified |
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| 263 | * as parameters. |
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| 264 | */ |
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| 265 | getURL: function (bounds) { |
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| 266 | var url; |
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| 267 | var center = bounds.getCenterLonLat(); |
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| 268 | var mapSize = this.map.getSize(); |
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| 269 | |
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| 270 | if (this.singleTile) { |
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| 271 | //set up the call for GETMAPIMAGE or GETDYNAMICMAPOVERLAY with |
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| 272 | //dynamic map parameters |
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| 273 | var params = { |
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| 274 | setdisplaydpi: OpenLayers.DOTS_PER_INCH, |
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| 275 | setdisplayheight: mapSize.h*this.ratio, |
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| 276 | setdisplaywidth: mapSize.w*this.ratio, |
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| 277 | setviewcenterx: center.lon, |
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| 278 | setviewcentery: center.lat, |
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| 279 | setviewscale: this.map.getScale() |
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| 280 | }; |
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| 281 | |
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| 282 | if (this.useOverlay && !this.useAsyncOverlay) { |
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| 283 | //first we need to call GETVISIBLEMAPEXTENT to set the extent |
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| 284 | var getVisParams = {}; |
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| 285 | getVisParams = OpenLayers.Util.extend(getVisParams, params); |
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| 286 | getVisParams.operation = "GETVISIBLEMAPEXTENT"; |
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| 287 | getVisParams.version = "1.0.0"; |
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| 288 | getVisParams.session = this.params.session; |
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| 289 | getVisParams.mapName = this.params.mapName; |
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| 290 | getVisParams.format = 'text/xml'; |
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| 291 | url = this.getFullRequestString( getVisParams ); |
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| 292 | |
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| 293 | OpenLayers.Request.GET({url: url, async: false}); |
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| 294 | } |
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| 295 | //construct the full URL |
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| 296 | url = this.getFullRequestString( params ); |
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| 297 | } else { |
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| 298 | |
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| 299 | //tiled version |
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| 300 | var currentRes = this.map.getResolution(); |
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| 301 | var colidx = Math.floor((bounds.left-this.maxExtent.left)/currentRes); |
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| 302 | colidx = Math.round(colidx/this.tileSize.w); |
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| 303 | var rowidx = Math.floor((this.maxExtent.top-bounds.top)/currentRes); |
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| 304 | rowidx = Math.round(rowidx/this.tileSize.h); |
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| 305 | |
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| 306 | if (this.useHttpTile){ |
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| 307 | url = this.getImageFilePath( |
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| 308 | { |
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| 309 | tilecol: colidx, |
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| 310 | tilerow: rowidx, |
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| 311 | scaleindex: this.resolutions.length - this.map.zoom - 1 |
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| 312 | }); |
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| 313 | |
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| 314 | } else { |
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| 315 | url = this.getFullRequestString( |
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| 316 | { |
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| 317 | tilecol: colidx, |
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| 318 | tilerow: rowidx, |
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| 319 | scaleindex: this.resolutions.length - this.map.zoom - 1 |
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| 320 | }); |
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| 321 | } |
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| 322 | } |
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| 323 | return url; |
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| 324 | }, |
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| 325 | |
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| 326 | /** |
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| 327 | * Method: getFullRequestString |
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| 328 | * getFullRequestString on MapGuide layers is special, because we |
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| 329 | * do a regular expression replace on ',' in parameters to '+'. |
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| 330 | * This is why it is subclassed here. |
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| 331 | * |
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| 332 | * Parameters: |
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| 333 | * altUrl - {String} Alternative base URL to use. |
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| 334 | * |
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| 335 | * Returns: |
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| 336 | * {String} A string with the layer's url appropriately encoded for MapGuide |
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| 337 | */ |
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| 338 | getFullRequestString:function(newParams, altUrl) { |
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| 339 | // use layer's url unless altUrl passed in |
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| 340 | var url = (altUrl == null) ? this.url : altUrl; |
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| 341 | |
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| 342 | // if url is not a string, it should be an array of strings, |
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| 343 | // in which case we will randomly select one of them in order |
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| 344 | // to evenly distribute requests to different urls. |
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| 345 | if (typeof url == "object") { |
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| 346 | url = url[Math.floor(Math.random()*url.length)]; |
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| 347 | } |
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| 348 | // requestString always starts with url |
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| 349 | var requestString = url; |
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| 350 | |
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| 351 | // create a new params hashtable with all the layer params and the |
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| 352 | // new params together. then convert to string |
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| 353 | var allParams = OpenLayers.Util.extend({}, this.params); |
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| 354 | allParams = OpenLayers.Util.extend(allParams, newParams); |
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| 355 | // ignore parameters that are already in the url search string |
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| 356 | var urlParams = OpenLayers.Util.upperCaseObject( |
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| 357 | OpenLayers.Util.getParameters(url)); |
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| 358 | for(var key in allParams) { |
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| 359 | if(key.toUpperCase() in urlParams) { |
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| 360 | delete allParams[key]; |
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| 361 | } |
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| 362 | } |
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| 363 | var paramsString = OpenLayers.Util.getParameterString(allParams); |
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| 364 | |
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| 365 | /* MapGuide needs '+' seperating things like bounds/height/width. |
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| 366 | Since typically this is URL encoded, we use a slight hack: we |
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| 367 | depend on the list-like functionality of getParameterString to |
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| 368 | leave ',' only in the case of list items (since otherwise it is |
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| 369 | encoded) then do a regular expression replace on the , characters |
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| 370 | to '+' */ |
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| 371 | paramsString = paramsString.replace(/,/g, "+"); |
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| 372 | |
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| 373 | if (paramsString != "") { |
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| 374 | var lastServerChar = url.charAt(url.length - 1); |
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| 375 | if ((lastServerChar == "&") || (lastServerChar == "?")) { |
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| 376 | requestString += paramsString; |
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| 377 | } else { |
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| 378 | if (url.indexOf('?') == -1) { |
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| 379 | //serverPath has no ? -- add one |
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| 380 | requestString += '?' + paramsString; |
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| 381 | } else { |
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| 382 | //serverPath contains ?, so must already have paramsString at the end |
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| 383 | requestString += '&' + paramsString; |
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| 384 | } |
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| 385 | } |
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| 386 | } |
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| 387 | return requestString; |
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| 388 | }, |
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| 389 | |
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| 390 | /** |
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| 391 | * Method: getImageFilePath |
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| 392 | * special handler to request mapguide tiles from an http exposed tilecache |
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| 393 | * |
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| 394 | * Parameters: |
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| 395 | * altUrl - {String} Alternative base URL to use. |
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| 396 | * |
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| 397 | * Returns: |
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| 398 | * {String} A string with the url for the tile image |
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| 399 | */ |
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| 400 | getImageFilePath:function(newParams, altUrl) { |
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| 401 | // use layer's url unless altUrl passed in |
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| 402 | var url = (altUrl == null) ? this.url : altUrl; |
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| 403 | |
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| 404 | // if url is not a string, it should be an array of strings, |
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| 405 | // in which case we will randomly select one of them in order |
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| 406 | // to evenly distribute requests to different urls. |
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| 407 | if (typeof url == "object") { |
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| 408 | url = url[Math.floor(Math.random()*url.length)]; |
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| 409 | } |
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| 410 | // requestString always starts with url |
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| 411 | var requestString = url; |
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| 412 | |
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| 413 | var tileRowGroup = ""; |
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| 414 | var tileColGroup = ""; |
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| 415 | |
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| 416 | if (newParams.tilerow < 0) { |
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| 417 | tileRowGroup = '-'; |
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| 418 | } |
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| 419 | |
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| 420 | if (newParams.tilerow == 0 ) { |
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| 421 | tileRowGroup += '0'; |
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| 422 | } else { |
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| 423 | tileRowGroup += Math.floor(Math.abs(newParams.tilerow/this.params.tileRowsPerFolder)) * this.params.tileRowsPerFolder; |
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| 424 | } |
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| 425 | |
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| 426 | if (newParams.tilecol < 0) { |
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| 427 | tileColGroup = '-'; |
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| 428 | } |
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| 429 | |
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| 430 | if (newParams.tilecol == 0) { |
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| 431 | tileColGroup += '0'; |
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| 432 | } else { |
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| 433 | tileColGroup += Math.floor(Math.abs(newParams.tilecol/this.params.tileColumnsPerFolder)) * this.params.tileColumnsPerFolder; |
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| 434 | } |
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| 435 | |
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| 436 | var tilePath = '/S' + Math.floor(newParams.scaleindex) |
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| 437 | + '/' + this.params.basemaplayergroupname |
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| 438 | + '/R' + tileRowGroup |
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| 439 | + '/C' + tileColGroup |
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| 440 | + '/' + (newParams.tilerow % this.params.tileRowsPerFolder) |
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| 441 | + '_' + (newParams.tilecol % this.params.tileColumnsPerFolder) |
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| 442 | + '.' + this.params.format; |
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| 443 | |
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| 444 | if (this.params.querystring) { |
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| 445 | tilePath += "?" + this.params.querystring; |
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| 446 | } |
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| 447 | |
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| 448 | requestString += tilePath; |
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| 449 | return requestString; |
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| 450 | }, |
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| 451 | |
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| 452 | /** |
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| 453 | * Method: calculateGridLayout |
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| 454 | * Generate parameters for the grid layout. This |
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| 455 | * |
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| 456 | * Parameters: |
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| 457 | * bounds - {<OpenLayers.Bound>} |
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| 458 | * extent - {<OpenLayers.Bounds>} |
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| 459 | * resolution - {Number} |
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| 460 | * |
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| 461 | * Returns: |
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| 462 | * Object containing properties tilelon, tilelat, tileoffsetlat, |
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| 463 | * tileoffsetlat, tileoffsetx, tileoffsety |
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| 464 | */ |
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| 465 | calculateGridLayout: function(bounds, extent, resolution) { |
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| 466 | var tilelon = resolution * this.tileSize.w; |
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| 467 | var tilelat = resolution * this.tileSize.h; |
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| 468 | |
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| 469 | var offsetlon = bounds.left - extent.left; |
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| 470 | var tilecol = Math.floor(offsetlon/tilelon) - this.buffer; |
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| 471 | var tilecolremain = offsetlon/tilelon - tilecol; |
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| 472 | var tileoffsetx = -tilecolremain * this.tileSize.w; |
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| 473 | var tileoffsetlon = extent.left + tilecol * tilelon; |
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| 474 | |
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| 475 | var offsetlat = extent.top - bounds.top + tilelat; |
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| 476 | var tilerow = Math.floor(offsetlat/tilelat) - this.buffer; |
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| 477 | var tilerowremain = tilerow - offsetlat/tilelat; |
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| 478 | var tileoffsety = tilerowremain * this.tileSize.h; |
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| 479 | var tileoffsetlat = extent.top - tilelat*tilerow; |
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| 480 | |
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| 481 | return { |
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| 482 | tilelon: tilelon, tilelat: tilelat, |
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| 483 | tileoffsetlon: tileoffsetlon, tileoffsetlat: tileoffsetlat, |
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| 484 | tileoffsetx: tileoffsetx, tileoffsety: tileoffsety |
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| 485 | }; |
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| 486 | }, |
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| 487 | |
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| 488 | CLASS_NAME: "OpenLayers.Layer.MapGuide" |
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| 489 | }); |
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