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Add ol.source.ImageWMS#getGetFeatureInfoUrl

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This commit is contained in:
Éric Lemoine
2014-01-15 10:32:33 +01:00
parent d9437e469d
commit 7cf69d0f58
2 changed files with 136 additions and 32 deletions
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167
src/ol/source/imagewmssource.js
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@@ -6,6 +6,7 @@ goog.require('goog.string');
goog.require('goog.uri.utils');
goog.require('ol.Image');
goog.require('ol.extent');
goog.require('ol.proj');
goog.require('ol.source.Image');
goog.require('ol.source.wms');
goog.require('ol.source.wms.ServerType');
@@ -74,6 +75,24 @@ ol.source.ImageWMS = function(opt_options) {
*/
this.image_ = null;
/**
* @private
* @type {ol.Size}
*/
this.imageSize_ = [0, 0];
/**
* @private
* @type {ol.proj.Projection}
*/
this.renderedProjection_ = null;
/**
* @private
* @type {number}
*/
this.renderedResolution_ = NaN;
/**
* @private
* @type {number}
@@ -90,6 +109,63 @@ ol.source.ImageWMS = function(opt_options) {
goog.inherits(ol.source.ImageWMS, ol.source.Image);
/**
* Return the GetFeatureInfo URL for the passed coordinate, resolution, and
* projection. Return `undefined` if the GetFeatureInfo URL cannot be
* constructed.
* @param {ol.Coordinate} coordinate Coordinate.
* @param {number} resolution Resolution.
* @param {ol.proj.Projection} projection Projection.
* @param {!Object} params GetFeatureInfo params. `INFO_FORMAT` at least should
* be provided. If `QUERY_LAYERS` is not provided then the layers specified
* in the `LAYERS` parameter will be used. `VERSION` should not be
* specified here.
* @return {string|undefined} GetFeatureInfo URL.
*/
ol.source.ImageWMS.prototype.getGetFeatureInfoUrl =
function(coordinate, resolution, projection, params) {
goog.asserts.assert(!('VERSION' in params));
if (!goog.isDef(this.url_) || goog.isNull(this.image_)) {
return undefined;
}
goog.asserts.assert(this.imageSize_[0] !== 0 &&
this.imageSize_[1] !== 0);
goog.asserts.assert(!isNaN(this.renderedResolution_));
goog.asserts.assert(!goog.isNull(this.renderedProjection_));
if (resolution != this.renderedResolution_ ||
!ol.proj.equivalent(projection, this.renderedProjection_)) {
return undefined;
}
var extent = this.image_.getExtent();
var pixelRatio = this.image_.getPixelRatio();
var baseParams = {
'SERVICE': 'WMS',
'VERSION': ol.source.wms.DEFAULT_VERSION,
'REQUEST': 'GetFeatureInfo',
'FORMAT': 'image/png',
'TRANSPARENT': true,
'QUERY_LAYERS': goog.object.get(this.params_, 'LAYERS')
};
goog.object.extend(baseParams, this.params_, params);
var imageResolution = resolution / pixelRatio;
var x = Math.floor((coordinate[0] - extent[0]) / imageResolution);
var y = Math.floor((extent[3] - coordinate[1]) / imageResolution);
goog.object.set(baseParams, this.v13_ ? 'I' : 'X', x);
goog.object.set(baseParams, this.v13_ ? 'J' : 'Y', y);
return this.getRequestUrl_(extent, this.imageSize_, pixelRatio, projection,
baseParams);
};
/**
* Get the user-provided params, i.e. those passed to the constructor through
* the "params" option, and possibly updated using the updateParams method.
@@ -134,6 +210,62 @@ ol.source.ImageWMS.prototype.getImage =
};
goog.object.extend(params, this.params_);
extent = extent.slice();
var centerX = (extent[0] + extent[2]) / 2;
var centerY = (extent[1] + extent[3]) / 2;
if (this.ratio_ != 1) {
var halfWidth = this.ratio_ * (extent[2] - extent[0]) / 2;
var halfHeight = this.ratio_ * (extent[3] - extent[1]) / 2;
extent[0] = centerX - halfWidth;
extent[1] = centerY - halfHeight;
extent[2] = centerX + halfWidth;
extent[3] = centerY + halfHeight;
}
var imageResolution = resolution / pixelRatio;
// Compute an integer width and height.
var width = Math.ceil((extent[2] - extent[0]) / imageResolution);
var height = Math.ceil((extent[3] - extent[1]) / imageResolution);
// Modify the extent to match the integer width and height.
extent[0] = centerX - imageResolution * width / 2;
extent[2] = centerX + imageResolution * width / 2;
extent[1] = centerY - imageResolution * height / 2;
extent[3] = centerY + imageResolution * height / 2;
this.imageSize_[0] = width;
this.imageSize_[1] = height;
var url = this.getRequestUrl_(extent, this.imageSize_, pixelRatio,
projection, params);
this.image_ = new ol.Image(extent, resolution, pixelRatio,
this.getAttributions(), url, this.crossOrigin_);
this.renderedProjection_ = projection;
this.renderedResolution_ = resolution;
this.renderedRevision_ = this.getRevision();
return this.image_;
};
/**
* @param {ol.Extent} extent Extent.
* @param {ol.Size} size Size.
* @param {number} pixelRatio Pixel ratio.
* @param {ol.proj.Projection} projection Projection.
* @param {Object} params Params.
* @return {string} Request URL.
* @private
*/
ol.source.ImageWMS.prototype.getRequestUrl_ =
function(extent, size, pixelRatio, projection, params) {
goog.asserts.assert(goog.isDef(this.url_));
params[this.v13_ ? 'CRS' : 'SRS'] = projection.getCode();
if (!('STYLES' in this.params_)) {
@@ -158,31 +290,8 @@ ol.source.ImageWMS.prototype.getImage =
}
}
extent = extent.slice();
var centerX = (extent[0] + extent[2]) / 2;
var centerY = (extent[1] + extent[3]) / 2;
if (this.ratio_ != 1) {
var halfWidth = this.ratio_ * (extent[2] - extent[0]) / 2;
var halfHeight = this.ratio_ * (extent[3] - extent[1]) / 2;
extent[0] = centerX - halfWidth;
extent[1] = centerY - halfHeight;
extent[2] = centerX + halfWidth;
extent[3] = centerY + halfHeight;
}
var imageResolution = resolution / pixelRatio;
// Compute an integer width and height.
var width = Math.ceil((extent[2] - extent[0]) / imageResolution);
goog.object.set(params, 'WIDTH', width);
var height = Math.ceil((extent[3] - extent[1]) / imageResolution);
goog.object.set(params, 'HEIGHT', height);
// Modify the extent to match the integer width and height.
extent[0] = centerX - imageResolution * width / 2;
extent[2] = centerX + imageResolution * width / 2;
extent[1] = centerY - imageResolution * height / 2;
extent[3] = centerY + imageResolution * height / 2;
goog.object.set(params, 'WIDTH', size[0]);
goog.object.set(params, 'HEIGHT', size[1]);
var axisOrientation = projection.getAxisOrientation();
var bbox;
@@ -193,13 +302,7 @@ ol.source.ImageWMS.prototype.getImage =
}
goog.object.set(params, 'BBOX', bbox.join(','));
var url = goog.uri.utils.appendParamsFromMap(this.url_, params);
this.image_ = new ol.Image(extent, resolution, pixelRatio,
this.getAttributions(), url, this.crossOrigin_);
this.renderedRevision_ = this.getRevision();
return this.image_;
return goog.uri.utils.appendParamsFromMap(this.url_, params);
};