openlayers
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Build tools and sources for developing OpenLayers based mapping applications
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JavaScript
goog.provide('ol.source.TileArcGISRest');
goog.require('ol');
goog.require('ol.extent');
goog.require('ol.math');
goog.require('ol.obj');
goog.require('ol.size');
goog.require('ol.source.TileImage');
goog.require('ol.tilecoord');
goog.require('ol.uri');
/**
* @classdesc
* Layer source for tile data from ArcGIS Rest services. Map and Image
* Services are supported.
*
* For cached ArcGIS services, better performance is available using the
* {@link ol.source.XYZ} data source.
*
* @constructor
* @extends {ol.source.TileImage}
* @param {olx.source.TileArcGISRestOptions=} opt_options Tile ArcGIS Rest
* options.
* @api
*/
ol.source.TileArcGISRest = function(opt_options) {
var options = opt_options || {};
ol.source.TileImage.call(this, {
attributions: options.attributions,
cacheSize: options.cacheSize,
crossOrigin: options.crossOrigin,
logo: options.logo,
projection: options.projection,
reprojectionErrorThreshold: options.reprojectionErrorThreshold,
tileGrid: options.tileGrid,
tileLoadFunction: options.tileLoadFunction,
url: options.url,
urls: options.urls,
wrapX: options.wrapX !== undefined ? options.wrapX : true
});
/**
* @private
* @type {!Object}
*/
this.params_ = options.params || {};
/**
* @private
* @type {ol.Extent}
*/
this.tmpExtent_ = ol.extent.createEmpty();
this.setKey(this.getKeyForParams_());
};
ol.inherits(ol.source.TileArcGISRest, ol.source.TileImage);
/**
* @private
* @return {string} The key for the current params.
*/
ol.source.TileArcGISRest.prototype.getKeyForParams_ = function() {
var i = 0;
var res = [];
for (var key in this.params_) {
res[i++] = key + '-' + this.params_[key];
}
return res.join('/');
};
/**
* Get the user-provided params, i.e. those passed to the constructor through
* the "params" option, and possibly updated using the updateParams method.
* @return {Object} Params.
* @api
*/
ol.source.TileArcGISRest.prototype.getParams = function() {
return this.params_;
};
/**
* @param {ol.TileCoord} tileCoord Tile coordinate.
* @param {ol.Size} tileSize Tile size.
* @param {ol.Extent} tileExtent Tile extent.
* @param {number} pixelRatio Pixel ratio.
* @param {ol.proj.Projection} projection Projection.
* @param {Object} params Params.
* @return {string|undefined} Request URL.
* @private
*/
ol.source.TileArcGISRest.prototype.getRequestUrl_ = function(tileCoord, tileSize, tileExtent,
pixelRatio, projection, params) {
var urls = this.urls;
if (!urls) {
return undefined;
}
// ArcGIS Server only wants the numeric portion of the projection ID.
var srid = projection.getCode().split(':').pop();
params['SIZE'] = tileSize[0] + ',' + tileSize[1];
params['BBOX'] = tileExtent.join(',');
params['BBOXSR'] = srid;
params['IMAGESR'] = srid;
params['DPI'] = Math.round(
params['DPI'] ? params['DPI'] * pixelRatio : 90 * pixelRatio
);
var url;
if (urls.length == 1) {
url = urls[0];
} else {
var index = ol.math.modulo(ol.tilecoord.hash(tileCoord), urls.length);
url = urls[index];
}
var modifiedUrl = url
.replace(/MapServer\/?$/, 'MapServer/export')
.replace(/ImageServer\/?$/, 'ImageServer/exportImage');
return ol.uri.appendParams(modifiedUrl, params);
};
/**
* @inheritDoc
*/
ol.source.TileArcGISRest.prototype.getTilePixelRatio = function(pixelRatio) {
return /** @type {number} */ (pixelRatio);
};
/**
* @inheritDoc
*/
ol.source.TileArcGISRest.prototype.fixedTileUrlFunction = function(tileCoord, pixelRatio, projection) {
var tileGrid = this.getTileGrid();
if (!tileGrid) {
tileGrid = this.getTileGridForProjection(projection);
}
if (tileGrid.getResolutions().length <= tileCoord[0]) {
return undefined;
}
var tileExtent = tileGrid.getTileCoordExtent(
tileCoord, this.tmpExtent_);
var tileSize = ol.size.toSize(
tileGrid.getTileSize(tileCoord[0]), this.tmpSize);
if (pixelRatio != 1) {
tileSize = ol.size.scale(tileSize, pixelRatio, this.tmpSize);
}
// Apply default params and override with user specified values.
var baseParams = {
'F': 'image',
'FORMAT': 'PNG32',
'TRANSPARENT': true
};
ol.obj.assign(baseParams, this.params_);
return this.getRequestUrl_(tileCoord, tileSize, tileExtent,
pixelRatio, projection, baseParams);
};
/**
* Update the user-provided params.
* @param {Object} params Params.
* @api stable
*/
ol.source.TileArcGISRest.prototype.updateParams = function(params) {
ol.obj.assign(this.params_, params);
this.setKey(this.getKeyForParams_());
};