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| Viewing file: Select action/file-type: /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the Clear BSD license.
* See http://svn.openlayers.org/trunk/openlayers/license.txt for the
* full text of the license. */
/**
* @requires OpenLayers/Request/XMLHttpRequest.js
* @requires OpenLayers/Layer/Grid.js
*/
/**
* Class: OpenLayers.Layer.MapGuide
* Instances of OpenLayers.Layer.MapGuide are used to display
* data from a MapGuide OS instance.
*
* Inherits from:
* - <OpenLayers.Layer.Grid>
*/
OpenLayers.Layer.MapGuide = OpenLayers.Class(OpenLayers.Layer.Grid, {
/**
* APIProperty: isBaseLayer
* {Boolean} Treat this layer as a base layer. Default is true.
**/
isBaseLayer: true,
/**
* APIProperty: useHttpTile
* {Boolean} use a tile cache exposed directly via a webserver rather than the
* via mapguide server. This does require extra configuration on the Mapguide Server,
* and will only work when singleTile is false. The url for the layer must be set to the
* webserver path rather than the Mapguide mapagent.
* See http://trac.osgeo.org/mapguide/wiki/CodeSamples/Tiles/ServingTilesViaHttp
**/
useHttpTile: false,
/**
* APIProperty: singleTile
* {Boolean} use tile server or request single tile image.
**/
singleTile: false,
/**
* APIProperty: useOverlay
* {Boolean} flag to indicate if the layer should be retrieved using
* GETMAPIMAGE (default) or using GETDYNAMICOVERLAY requests.
**/
useOverlay: false,
/**
* APIProperty: useAsyncOverlay
* {Boolean} indicates if the MapGuide site supports the asynchronous
* GETDYNAMICOVERLAY requests which is available in MapGuide Enterprise 2010
* and MapGuide Open Source v2.0.3 or higher. The newer versions of MG
* is called asynchronously, allows selections to be drawn separately from
* the map and offers styling options.
*
* With older versions of MapGuide, set useAsyncOverlay=false. Note that in
* this case a synchronous AJAX call is issued and the mapname and session
* parameters must be used to initialize the layer, not the mapdefinition
* parameter. Also note that this will issue a synchronous AJAX request
* before the image request can be issued so the users browser may lock
* up if the MG Web tier does not respond in a timely fashion.
**/
useAsyncOverlay: true,
/**
* Constant: TILE_PARAMS
* {Object} Hashtable of default parameter key/value pairs for tiled layer
*/
TILE_PARAMS: {
operation: 'GETTILEIMAGE',
version: '1.2.0'
},
/**
* Constant: SINGLE_TILE_PARAMS
* {Object} Hashtable of default parameter key/value pairs for untiled layer
*/
SINGLE_TILE_PARAMS: {
operation: 'GETMAPIMAGE',
format: 'PNG',
locale: 'en',
clip: '1',
version: '1.0.0'
},
/**
* Constant: OVERLAY_PARAMS
* {Object} Hashtable of default parameter key/value pairs for untiled layer
*/
OVERLAY_PARAMS: {
operation: 'GETDYNAMICMAPOVERLAYIMAGE',
format: 'PNG',
locale: 'en',
clip: '1',
version: '2.0.0'
},
/**
* Constant: FOLDER_PARAMS
* {Object} Hashtable of parameter key/value pairs which describe
* the folder structure for tiles as configured in the mapguide
* serverconfig.ini section [TileServiceProperties]
*/
FOLDER_PARAMS: {
tileColumnsPerFolder: 30,
tileRowsPerFolder: 30,
format: 'png',
querystring: null
},
/**
* Property: defaultSize
* {<OpenLayers.Size>} Tile size as produced by MapGuide server
**/
defaultSize: new OpenLayers.Size(300,300),
/**
* Constructor: OpenLayers.Layer.MapGuide
* Create a new Mapguide layer, either tiled or untiled.
*
* For tiled layers, the 'groupName' and 'mapDefinition' values
* must be specified as parameters in the constructor.
*
* For untiled base layers, specify either combination of 'mapName' and
* 'session', or 'mapDefinition' and 'locale'.
*
* For older versions of MapGuide and overlay layers, set useAsyncOverlay
* to false and in this case mapName and session are required parameters
* for the constructor.
*
* NOTE: MapGuide OS uses a DPI value and degrees to meters conversion
* factor that are different than the defaults used in OpenLayers,
* so these must be adjusted accordingly in your application.
* See the MapGuide example for how to set these values for MGOS.
*
* Parameters:
* name - {String} Name of the layer displayed in the interface
* url - {String} Location of the MapGuide mapagent executable
* (e.g. http://localhost:8008/mapguide/mapagent/mapagent.fcgi)
* params - {Object} hashtable of additional parameters to use. Some
* parameters may require additional code on the server. The ones that
* you may want to use are:
* - mapDefinition - {String} The MapGuide resource definition
* (e.g. Library://Samples/Gmap/Maps/gmapTiled.MapDefinition)
* - locale - Locale setting
* (for untiled overlays layers only)
* - mapName - {String} Name of the map as stored in the MapGuide session.
* (for untiled layers with a session parameter only)
* - session - { String} MapGuide session ID
* (for untiled overlays layers only)
* - basemaplayergroupname - {String} GroupName for tiled MapGuide layers only
* - format - Image format to be returned (for untiled overlay layers only)
* - showLayers - {String} A comma separated list of GUID's for the
* layers to display eg: 'cvc-xcv34,453-345-345sdf'.
* - hideLayers - {String} A comma separated list of GUID's for the
* layers to hide eg: 'cvc-xcv34,453-345-345sdf'.
* - showGroups - {String} A comma separated list of GUID's for the
* groups to display eg: 'cvc-xcv34,453-345-345sdf'.
* - hideGroups - {String} A comma separated list of GUID's for the
* groups to hide eg: 'cvc-xcv34,453-345-345sdf'
* - selectionXml - {String} A selection xml string Some server plumbing
* is required to read such a value.
* options - {Ojbect} Hashtable of extra options to tag onto the layer;
* will vary depending if tiled or untiled maps are being requested
*/
initialize: function(name, url, params, options) {
OpenLayers.Layer.Grid.prototype.initialize.apply(this, arguments);
// unless explicitly set in options, if the layer is transparent,
// it will be an overlay
if (options == null || options.isBaseLayer == null) {
this.isBaseLayer = ((this.transparent != "true") &&
(this.transparent != true));
}
if (options && options.useOverlay!=null) {
this.useOverlay = options.useOverlay;
}
//initialize for untiled layers
if (this.singleTile) {
if (this.useOverlay) {
OpenLayers.Util.applyDefaults(
this.params,
this.OVERLAY_PARAMS
);
if (!this.useAsyncOverlay) {
this.params.version = "1.0.0";
}
} else {
OpenLayers.Util.applyDefaults(
this.params,
this.SINGLE_TILE_PARAMS
);
}
} else {
//initialize for tiled layers
if (this.useHttpTile) {
OpenLayers.Util.applyDefaults(
this.params,
this.FOLDER_PARAMS
);
} else {
OpenLayers.Util.applyDefaults(
this.params,
this.TILE_PARAMS
);
}
this.setTileSize(this.defaultSize);
}
},
/**
* Method: clone
* Create a clone of this layer
*
* Returns:
* {<OpenLayers.Layer.MapGuide>} An exact clone of this layer
*/
clone: function (obj) {
if (obj == null) {
obj = new OpenLayers.Layer.MapGuide(this.name,
this.url,
this.params,
this.getOptions());
}
//get all additions from superclasses
obj = OpenLayers.Layer.Grid.prototype.clone.apply(this, [obj]);
return obj;
},
/**
* Method: addTile
* Creates a tile, initializes it, and adds it to the layer div.
*
* Parameters:
* bounds - {<OpenLayers.Bounds>}
* position - {<OpenLayers.Pixel>}
*
* Returns:
* {<OpenLayers.Tile.Image>} The added OpenLayers.Tile.Image
*/
addTile:function(bounds,position) {
return new OpenLayers.Tile.Image(this, position, bounds,
null, this.tileSize);
},
/**
* Method: getURL
* Return a query string for this layer
*
* Parameters:
* bounds - {<OpenLayers.Bounds>} A bounds representing the bbox
* for the request
*
* Returns:
* {String} A string with the layer's url and parameters and also
* the passed-in bounds and appropriate tile size specified
* as parameters.
*/
getURL: function (bounds) {
var url;
var center = bounds.getCenterLonLat();
var mapSize = this.map.getSize();
if (this.singleTile) {
//set up the call for GETMAPIMAGE or GETDYNAMICMAPOVERLAY with
//dynamic map parameters
var params = {
setdisplaydpi: OpenLayers.DOTS_PER_INCH,
setdisplayheight: mapSize.h*this.ratio,
setdisplaywidth: mapSize.w*this.ratio,
setviewcenterx: center.lon,
setviewcentery: center.lat,
setviewscale: this.map.getScale()
};
if (this.useOverlay && !this.useAsyncOverlay) {
//first we need to call GETVISIBLEMAPEXTENT to set the extent
var getVisParams = {};
getVisParams = OpenLayers.Util.extend(getVisParams, params);
getVisParams.operation = "GETVISIBLEMAPEXTENT";
getVisParams.version = "1.0.0";
getVisParams.session = this.params.session;
getVisParams.mapName = this.params.mapName;
getVisParams.format = 'text/xml';
url = this.getFullRequestString( getVisParams );
OpenLayers.Request.GET({url: url, async: false});
}
//construct the full URL
url = this.getFullRequestString( params );
} else {
//tiled version
var currentRes = this.map.getResolution();
var colidx = Math.floor((bounds.left-this.maxExtent.left)/currentRes);
colidx = Math.round(colidx/this.tileSize.w);
var rowidx = Math.floor((this.maxExtent.top-bounds.top)/currentRes);
rowidx = Math.round(rowidx/this.tileSize.h);
if (this.useHttpTile){
url = this.getImageFilePath(
{
tilecol: colidx,
tilerow: rowidx,
scaleindex: this.resolutions.length - this.map.zoom - 1
});
} else {
url = this.getFullRequestString(
{
tilecol: colidx,
tilerow: rowidx,
scaleindex: this.resolutions.length - this.map.zoom - 1
});
}
}
return url;
},
/**
* Method: getFullRequestString
* getFullRequestString on MapGuide layers is special, because we
* do a regular expression replace on ',' in parameters to '+'.
* This is why it is subclassed here.
*
* Parameters:
* altUrl - {String} Alternative base URL to use.
*
* Returns:
* {String} A string with the layer's url appropriately encoded for MapGuide
*/
getFullRequestString:function(newParams, altUrl) {
// use layer's url unless altUrl passed in
var url = (altUrl == null) ? this.url : altUrl;
// if url is not a string, it should be an array of strings,
// in which case we will randomly select one of them in order
// to evenly distribute requests to different urls.
if (typeof url == "object") {
url = url[Math.floor(Math.random()*url.length)];
}
// requestString always starts with url
var requestString = url;
// create a new params hashtable with all the layer params and the
// new params together. then convert to string
var allParams = OpenLayers.Util.extend({}, this.params);
allParams = OpenLayers.Util.extend(allParams, newParams);
// ignore parameters that are already in the url search string
var urlParams = OpenLayers.Util.upperCaseObject(
OpenLayers.Util.getParameters(url));
for(var key in allParams) {
if(key.toUpperCase() in urlParams) {
delete allParams[key];
}
}
var paramsString = OpenLayers.Util.getParameterString(allParams);
/* MapGuide needs '+' seperating things like bounds/height/width.
Since typically this is URL encoded, we use a slight hack: we
depend on the list-like functionality of getParameterString to
leave ',' only in the case of list items (since otherwise it is
encoded) then do a regular expression replace on the , characters
to '+' */
paramsString = paramsString.replace(/,/g, "+");
if (paramsString != "") {
var lastServerChar = url.charAt(url.length - 1);
if ((lastServerChar == "&") || (lastServerChar == "?")) {
requestString += paramsString;
} else {
if (url.indexOf('?') == -1) {
//serverPath has no ? -- add one
requestString += '?' + paramsString;
} else {
//serverPath contains ?, so must already have paramsString at the end
requestString += '&' + paramsString;
}
}
}
return requestString;
},
/**
* Method: getImageFilePath
* special handler to request mapguide tiles from an http exposed tilecache
*
* Parameters:
* altUrl - {String} Alternative base URL to use.
*
* Returns:
* {String} A string with the url for the tile image
*/
getImageFilePath:function(newParams, altUrl) {
// use layer's url unless altUrl passed in
var url = (altUrl == null) ? this.url : altUrl;
// if url is not a string, it should be an array of strings,
// in which case we will randomly select one of them in order
// to evenly distribute requests to different urls.
if (typeof url == "object") {
url = url[Math.floor(Math.random()*url.length)];
}
// requestString always starts with url
var requestString = url;
var tileRowGroup = "";
var tileColGroup = "";
if (newParams.tilerow < 0) {
tileRowGroup = '-';
}
if (newParams.tilerow == 0 ) {
tileRowGroup += '0';
} else {
tileRowGroup += Math.floor(Math.abs(newParams.tilerow/this.params.tileRowsPerFolder)) * this.params.tileRowsPerFolder;
}
if (newParams.tilecol < 0) {
tileColGroup = '-';
}
if (newParams.tilecol == 0) {
tileColGroup += '0';
} else {
tileColGroup += Math.floor(Math.abs(newParams.tilecol/this.params.tileColumnsPerFolder)) * this.params.tileColumnsPerFolder;
}
var tilePath = '/S' + Math.floor(newParams.scaleindex)
+ '/' + this.params.basemaplayergroupname
+ '/R' + tileRowGroup
+ '/C' + tileColGroup
+ '/' + (newParams.tilerow % this.params.tileRowsPerFolder)
+ '_' + (newParams.tilecol % this.params.tileColumnsPerFolder)
+ '.' + this.params.format;
if (this.params.querystring) {
tilePath += "?" + this.params.querystring;
}
requestString += tilePath;
return requestString;
},
/**
* Method: calculateGridLayout
* Generate parameters for the grid layout. This
*
* Parameters:
* bounds - {<OpenLayers.Bound>}
* extent - {<OpenLayers.Bounds>}
* resolution - {Number}
*
* Returns:
* Object containing properties tilelon, tilelat, tileoffsetlat,
* tileoffsetlat, tileoffsetx, tileoffsety
*/
calculateGridLayout: function(bounds, extent, resolution) {
var tilelon = resolution * this.tileSize.w;
var tilelat = resolution * this.tileSize.h;
var offsetlon = bounds.left - extent.left;
var tilecol = Math.floor(offsetlon/tilelon) - this.buffer;
var tilecolremain = offsetlon/tilelon - tilecol;
var tileoffsetx = -tilecolremain * this.tileSize.w;
var tileoffsetlon = extent.left + tilecol * tilelon;
var offsetlat = extent.top - bounds.top + tilelat;
var tilerow = Math.floor(offsetlat/tilelat) - this.buffer;
var tilerowremain = tilerow - offsetlat/tilelat;
var tileoffsety = tilerowremain * this.tileSize.h;
var tileoffsetlat = extent.top - tilelat*tilerow;
return {
tilelon: tilelon, tilelat: tilelat,
tileoffsetlon: tileoffsetlon, tileoffsetlat: tileoffsetlat,
tileoffsetx: tileoffsetx, tileoffsety: tileoffsety
};
},
CLASS_NAME: "OpenLayers.Layer.MapGuide"
});
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