384 lines
9.3 KiB
JavaScript
384 lines
9.3 KiB
JavaScript
// FIXME cannot be shared between maps with different projections
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goog.provide('ol.source.ImageWMS');
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goog.require('goog.asserts');
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goog.require('goog.events');
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goog.require('goog.events.EventType');
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goog.require('goog.object');
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goog.require('goog.string');
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goog.require('goog.uri.utils');
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goog.require('ol');
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goog.require('ol.Image');
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goog.require('ol.ImageLoadFunctionType');
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goog.require('ol.extent');
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goog.require('ol.proj');
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goog.require('ol.source.Image');
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goog.require('ol.source.wms');
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goog.require('ol.source.wms.ServerType');
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/**
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* @classdesc
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* Source for WMS servers providing single, untiled images.
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*
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* @constructor
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* @fires ol.source.ImageEvent
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* @extends {ol.source.Image}
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* @param {olx.source.ImageWMSOptions=} opt_options Options.
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* @api stable
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*/
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ol.source.ImageWMS = function(opt_options) {
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var options = goog.isDef(opt_options) ? opt_options : {};
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goog.base(this, {
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attributions: options.attributions,
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logo: options.logo,
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projection: options.projection,
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resolutions: options.resolutions
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});
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/**
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* @private
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* @type {?string}
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*/
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this.crossOrigin_ =
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goog.isDef(options.crossOrigin) ? options.crossOrigin : null;
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/**
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* @private
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* @type {string|undefined}
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*/
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this.url_ = options.url;
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/**
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* @private
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* @type {ol.ImageLoadFunctionType}
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*/
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this.imageLoadFunction_ = goog.isDef(options.imageLoadFunction) ?
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options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;
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/**
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* @private
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* @type {Object}
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*/
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this.params_ = options.params;
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/**
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* @private
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* @type {boolean}
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*/
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this.v13_ = true;
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this.updateV13_();
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/**
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* @private
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* @type {ol.source.wms.ServerType|undefined}
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*/
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this.serverType_ =
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/** @type {ol.source.wms.ServerType|undefined} */ (options.serverType);
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/**
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* @private
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* @type {boolean}
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*/
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this.hidpi_ = goog.isDef(options.hidpi) ? options.hidpi : true;
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/**
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* @private
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* @type {ol.Image}
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*/
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this.image_ = null;
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/**
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* @private
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* @type {ol.Size}
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*/
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this.imageSize_ = [0, 0];
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/**
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* @private
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* @type {number}
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*/
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this.renderedRevision_ = 0;
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/**
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* @private
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* @type {number}
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*/
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this.ratio_ = goog.isDef(options.ratio) ? options.ratio : 1.5;
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};
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goog.inherits(ol.source.ImageWMS, ol.source.Image);
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/**
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* @const
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* @type {ol.Size}
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* @private
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*/
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ol.source.ImageWMS.GETFEATUREINFO_IMAGE_SIZE_ = [101, 101];
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/**
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* Return the GetFeatureInfo URL for the passed coordinate, resolution, and
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* projection. Return `undefined` if the GetFeatureInfo URL cannot be
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* constructed.
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* @param {ol.Coordinate} coordinate Coordinate.
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* @param {number} resolution Resolution.
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* @param {ol.proj.ProjectionLike} projection Projection.
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* @param {!Object} params GetFeatureInfo params. `INFO_FORMAT` at least should
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* be provided. If `QUERY_LAYERS` is not provided then the layers specified
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* in the `LAYERS` parameter will be used. `VERSION` should not be
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* specified here.
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* @return {string|undefined} GetFeatureInfo URL.
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* @api stable
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*/
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ol.source.ImageWMS.prototype.getGetFeatureInfoUrl =
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function(coordinate, resolution, projection, params) {
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goog.asserts.assert(!('VERSION' in params),
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'key VERSION is not allowed in params');
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if (!goog.isDef(this.url_)) {
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return undefined;
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}
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var extent = ol.extent.getForViewAndSize(
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coordinate, resolution, 0,
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ol.source.ImageWMS.GETFEATUREINFO_IMAGE_SIZE_);
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var baseParams = {
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'SERVICE': 'WMS',
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'VERSION': ol.DEFAULT_WMS_VERSION,
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'REQUEST': 'GetFeatureInfo',
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'FORMAT': 'image/png',
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'TRANSPARENT': true,
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'QUERY_LAYERS': this.params_['LAYERS']
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};
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goog.object.extend(baseParams, this.params_, params);
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var x = Math.floor((coordinate[0] - extent[0]) / resolution);
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var y = Math.floor((extent[3] - coordinate[1]) / resolution);
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baseParams[this.v13_ ? 'I' : 'X'] = x;
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baseParams[this.v13_ ? 'J' : 'Y'] = y;
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return this.getRequestUrl_(
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extent, ol.source.ImageWMS.GETFEATUREINFO_IMAGE_SIZE_,
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1, ol.proj.get(projection), baseParams);
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};
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/**
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* Get the user-provided params, i.e. those passed to the constructor through
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* the "params" option, and possibly updated using the updateParams method.
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* @return {Object} Params.
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* @api stable
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*/
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ol.source.ImageWMS.prototype.getParams = function() {
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return this.params_;
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};
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/**
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* @inheritDoc
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*/
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ol.source.ImageWMS.prototype.getImage =
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function(extent, resolution, pixelRatio, projection) {
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if (!goog.isDef(this.url_)) {
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return null;
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}
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resolution = this.findNearestResolution(resolution);
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if (pixelRatio != 1 && (!this.hidpi_ || !goog.isDef(this.serverType_))) {
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pixelRatio = 1;
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}
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var image = this.image_;
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if (!goog.isNull(image) &&
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this.renderedRevision_ == this.getRevision() &&
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image.getResolution() == resolution &&
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image.getPixelRatio() == pixelRatio &&
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ol.extent.containsExtent(image.getExtent(), extent)) {
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return image;
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}
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var params = {
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'SERVICE': 'WMS',
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'VERSION': ol.DEFAULT_WMS_VERSION,
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'REQUEST': 'GetMap',
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'FORMAT': 'image/png',
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'TRANSPARENT': true
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};
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goog.object.extend(params, this.params_);
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extent = extent.slice();
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var centerX = (extent[0] + extent[2]) / 2;
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var centerY = (extent[1] + extent[3]) / 2;
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if (this.ratio_ != 1) {
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var halfWidth = this.ratio_ * ol.extent.getWidth(extent) / 2;
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var halfHeight = this.ratio_ * ol.extent.getHeight(extent) / 2;
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extent[0] = centerX - halfWidth;
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extent[1] = centerY - halfHeight;
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extent[2] = centerX + halfWidth;
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extent[3] = centerY + halfHeight;
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}
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var imageResolution = resolution / pixelRatio;
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// Compute an integer width and height.
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var width = Math.ceil(ol.extent.getWidth(extent) / imageResolution);
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var height = Math.ceil(ol.extent.getHeight(extent) / imageResolution);
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// Modify the extent to match the integer width and height.
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extent[0] = centerX - imageResolution * width / 2;
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extent[2] = centerX + imageResolution * width / 2;
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extent[1] = centerY - imageResolution * height / 2;
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extent[3] = centerY + imageResolution * height / 2;
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this.imageSize_[0] = width;
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this.imageSize_[1] = height;
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var url = this.getRequestUrl_(extent, this.imageSize_, pixelRatio,
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projection, params);
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this.image_ = new ol.Image(extent, resolution, pixelRatio,
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this.getAttributions(), url, this.crossOrigin_, this.imageLoadFunction_);
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this.renderedRevision_ = this.getRevision();
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goog.events.listen(this.image_, goog.events.EventType.CHANGE,
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this.handleImageChange, false, this);
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return this.image_;
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};
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/**
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* @return {ol.ImageLoadFunctionType} The image load function.
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* @api
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*/
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ol.source.ImageWMS.prototype.getImageLoadFunction = function() {
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return this.imageLoadFunction_;
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};
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/**
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* @param {ol.Extent} extent Extent.
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* @param {ol.Size} size Size.
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* @param {number} pixelRatio Pixel ratio.
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* @param {ol.proj.Projection} projection Projection.
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* @param {Object} params Params.
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* @return {string} Request URL.
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* @private
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*/
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ol.source.ImageWMS.prototype.getRequestUrl_ =
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function(extent, size, pixelRatio, projection, params) {
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goog.asserts.assert(goog.isDef(this.url_), 'url is defined');
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params[this.v13_ ? 'CRS' : 'SRS'] = projection.getCode();
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if (!('STYLES' in this.params_)) {
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/* jshint -W053 */
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params['STYLES'] = new String('');
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/* jshint +W053 */
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}
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if (pixelRatio != 1) {
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switch (this.serverType_) {
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case ol.source.wms.ServerType.GEOSERVER:
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var dpi = (90 * pixelRatio + 0.5) | 0;
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params['FORMAT_OPTIONS'] = 'dpi:' + dpi;
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break;
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case ol.source.wms.ServerType.MAPSERVER:
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params['MAP_RESOLUTION'] = 90 * pixelRatio;
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break;
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case ol.source.wms.ServerType.CARMENTA_SERVER:
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case ol.source.wms.ServerType.QGIS:
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params['DPI'] = 90 * pixelRatio;
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break;
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default:
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goog.asserts.fail('unknown serverType configured');
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break;
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}
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}
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params['WIDTH'] = size[0];
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params['HEIGHT'] = size[1];
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var axisOrientation = projection.getAxisOrientation();
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var bbox;
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if (this.v13_ && axisOrientation.substr(0, 2) == 'ne') {
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bbox = [extent[1], extent[0], extent[3], extent[2]];
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} else {
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bbox = extent;
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}
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params['BBOX'] = bbox.join(',');
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return goog.uri.utils.appendParamsFromMap(this.url_, params);
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};
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/**
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* Return the URL used for this WMS source.
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* @return {string|undefined} URL.
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* @api stable
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*/
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ol.source.ImageWMS.prototype.getUrl = function() {
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return this.url_;
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};
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/**
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* @param {ol.ImageLoadFunctionType} imageLoadFunction Image load function.
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* @api
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*/
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ol.source.ImageWMS.prototype.setImageLoadFunction = function(
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imageLoadFunction) {
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this.image_ = null;
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this.imageLoadFunction_ = imageLoadFunction;
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this.changed();
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};
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/**
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* @param {string|undefined} url URL.
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* @api stable
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*/
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ol.source.ImageWMS.prototype.setUrl = function(url) {
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if (url != this.url_) {
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this.url_ = url;
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this.image_ = null;
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this.changed();
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}
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};
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/**
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* Update the user-provided params.
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* @param {Object} params Params.
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* @api stable
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*/
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ol.source.ImageWMS.prototype.updateParams = function(params) {
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goog.object.extend(this.params_, params);
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this.updateV13_();
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this.image_ = null;
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this.changed();
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};
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/**
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* @private
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*/
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ol.source.ImageWMS.prototype.updateV13_ = function() {
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var version =
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goog.object.get(this.params_, 'VERSION', ol.DEFAULT_WMS_VERSION);
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this.v13_ = goog.string.compareVersions(version, '1.3') >= 0;
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};
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