Add Mapguide Layer http served tile support. Patch from madair, positive
comments on usage from community members, r=me. (Closes #1622) git-svn-id: http://svn.openlayers.org/trunk/openlayers@9004 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
crschmidt
@@ -39,19 +39,17 @@
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//tiled version
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function initTiled(){
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var extent = new OpenLayers.Bounds(-3631568.75,-1293815.5,4491139.5833333321,4937122);
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var tempScales = [50000000,23207944.16806,10772173.45016,5000000,2320794.41681,1077217.34502,500000,232079.44168,107721.7345,50000];
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var extent = new OpenLayers.Bounds(-87.764987,43.691398,-87.695522,43.797520);
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var tempScales = [100000,51794.74679,26826.95795,13894.95494,7196.85673,3727.59372,1930.69773,1000];
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var mapOptions = {
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maxExtent: extent,
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scales: tempScales,
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units: 'm',
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projection: 'EPSG:42304'
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scales: tempScales
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};
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map = new OpenLayers.Map( 'map', mapOptions );
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var params = {
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mapdefinition: 'Library://Samples/Gmap/Maps/gmapTiled.MapDefinition',
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basemaplayergroupname: "BaseLayerGroup"
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mapdefinition: 'Library://Samples/Sheboygan/MapsTiled/Sheboygan.MapDefinition',
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basemaplayergroupname: "Base Layer Group"
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}
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var options = {
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singleTile: false
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@@ -59,6 +57,18 @@
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var layer = new OpenLayers.Layer.MapGuide( "MapGuide OS tiled layer", url, params, options );
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map.addLayer(layer);
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/**
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The following example shows how to access an MG tile cache directly
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through HTTP bypassing the MG mapagent. This depends on having a
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pre-populated tile cache
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*/
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/*
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options.useHttpTile = true;
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var cacheUrl = "http://localhost:8008/sheboygan";
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var httpLayer = new OpenLayers.Layer.MapGuide( "MapGuide HTTP cache tiled layer", cacheUrl, params, options );
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map.addLayer(httpLayer);
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*/
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map.zoomToMaxExtent();
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}
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@@ -23,6 +23,16 @@ OpenLayers.Layer.MapGuide = OpenLayers.Class(OpenLayers.Layer.Grid, {
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**/
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isBaseLayer: true,
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/**
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* APIProperty: useHttpTile
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* {Boolean} use a tile cache exposed directly via a webserver rather than the
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* via mapguide server. This does require extra configuration on the Mapguide Server,
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* and will only work when singleTile is false. The url for the layer must be set to the
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* webserver path rather than the Mapguide mapagent.
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* See http://trac.osgeo.org/mapguide/wiki/CodeSamples/Tiles/ServingTilesViaHttp
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**/
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useHttpTile: false,
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/**
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* APIProperty: singleTile
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* {Boolean} use tile server or request single tile image. Note that using
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@@ -53,6 +63,19 @@ OpenLayers.Layer.MapGuide = OpenLayers.Class(OpenLayers.Layer.Grid, {
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version: '1.0.0'
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},
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/**
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* Constant: FOLDER_PARAMS
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* {Object} Hashtable of parameter key/value pairs which describe
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* the folder structure for tiles as configured in the mapguide
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* serverconfig.ini section [TileServiceProperties]
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*/
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FOLDER_PARAMS: {
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tileColumnsPerFolder: 30,
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tileRowsPerFolder: 30,
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format: 'png',
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querystring: null
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},
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/**
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* Property: defaultSize
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* {<OpenLayers.Size>} Tile size as produced by MapGuide server
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@@ -130,10 +153,17 @@ OpenLayers.Layer.MapGuide = OpenLayers.Class(OpenLayers.Layer.Grid, {
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} else {
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//initialize for tiled layers
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OpenLayers.Util.applyDefaults(
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this.params,
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this.TILE_PARAMS
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);
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if (this.useHttpTile) {
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OpenLayers.Util.applyDefaults(
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this.params,
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this.FOLDER_PARAMS
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);
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} else {
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OpenLayers.Util.applyDefaults(
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this.params,
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this.TILE_PARAMS
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);
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}
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this.setTileSize(this.defaultSize);
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}
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},
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@@ -230,15 +260,24 @@ OpenLayers.Layer.MapGuide = OpenLayers.Class(OpenLayers.Layer.Grid, {
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var rowidx = Math.floor((this.maxExtent.top-bounds.top)/currentRes);
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rowidx = Math.round(rowidx/this.tileSize.h);
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url = this.getFullRequestString(
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{
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tilecol: colidx,
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tilerow: rowidx,
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scaleindex: this.resolutions.length - this.map.zoom - 1
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});
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}
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return url;
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if (this.useHttpTile){
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url = this.getImageFilePath(
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{
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tilecol: colidx,
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tilerow: rowidx,
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scaleindex: this.resolutions.length - this.map.zoom - 1
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});
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} else {
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url = this.getFullRequestString(
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{
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tilecol: colidx,
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tilerow: rowidx,
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scaleindex: this.resolutions.length - this.map.zoom - 1
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});
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}
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}
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return url;
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},
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/**
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@@ -305,6 +344,68 @@ OpenLayers.Layer.MapGuide = OpenLayers.Class(OpenLayers.Layer.Grid, {
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return requestString;
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},
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/**
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* Method: getImageFilePath
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* special handler to request mapguide tiles from an http exposed tilecache
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*
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* Parameters:
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* altUrl - {String} Alternative base URL to use.
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*
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* Returns:
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* {String} A string with the url for the tile image
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*/
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getImageFilePath:function(newParams, altUrl) {
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// use layer's url unless altUrl passed in
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var url = (altUrl == null) ? this.url : altUrl;
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// if url is not a string, it should be an array of strings,
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// in which case we will randomly select one of them in order
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// to evenly distribute requests to different urls.
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if (typeof url == "object") {
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url = url[Math.floor(Math.random()*url.length)];
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}
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// requestString always starts with url
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var requestString = url;
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var tileRowGroup = "";
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var tileColGroup = "";
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if (newParams.tilerow < 0) {
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tileRowGroup = '-';
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}
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if (newParams.tilerow == 0 ) {
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tileRowGroup += '0';
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} else {
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tileRowGroup += Math.floor(Math.abs(newParams.tilerow/this.params.tileRowsPerFolder)) * this.params.tileRowsPerFolder;
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}
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if (newParams.tilecol < 0) {
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tileColGroup = '-';
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}
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if (newParams.tilecol == 0) {
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tileColGroup += '0';
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} else {
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tileColGroup += Math.floor(Math.abs(newParams.tilecol/this.params.tileColumnsPerFolder)) * this.params.tileColumnsPerFolder;
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}
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var tilePath = '/S' + Math.floor(newParams.scaleindex)
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+ '/' + this.params.basemaplayergroupname
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+ '/R' + tileRowGroup
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+ '/C' + tileColGroup
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+ '/' + (newParams.tilerow % this.params.tileRowsPerFolder)
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+ '_' + (newParams.tilecol % this.params.tileColumnsPerFolder)
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+ '.' + this.params.format;
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if (this.params.querystring) {
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tilePath += "?" + this.params.querystring;
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}
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requestString += tilePath;
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return requestString;
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},
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/**
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* Method: calculateGridLayout
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* Generate parameters for the grid layout. This
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