Add ol.source.SingleImageWMS

src/ol/source/singleimagewms.exports

@@ -0,0 +1 @@
+@exportSymbol ol.source.SingleImageWMS

src/ol/source/singleimagewmssource.js

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+goog.provide('ol.source.SingleImageWMS');
+
+goog.require('ol.Extent');
+goog.require('ol.Image');
+goog.require('ol.ImageUrlFunction');
+goog.require('ol.Projection');
+goog.require('ol.Size');
+goog.require('ol.source.ImageSource');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.source.ImageSource}
+ * @param {ol.source.SingleImageWMSOptions} options Options.
+ */
+ol.source.SingleImageWMS = function(options) {
+
+  var projection = ol.Projection.createProjection(
+      options.projection, 'EPSG:3857');
+  var projectionExtent = projection.getExtent();
+
+  var extent = goog.isDef(options.extent) ?
+      options.extent : projectionExtent;
+
+  var version = goog.isDef(options.version) ?
+      options.version : '1.3';
+
+  var baseParams = {
+    'SERVICE': 'WMS',
+    'VERSION': version,
+    'REQUEST': 'GetMap',
+    'STYLES': '',
+    'FORMAT': 'image/png',
+    'TRANSPARENT': true
+  };
+  baseParams[version >= '1.3' ? 'CRS' : 'SRS'] = projection.getCode();
+  goog.object.extend(baseParams, options.params);
+
+  var imageUrlFunction;
+  if (options.url) {
+    var url = goog.uri.utils.appendParamsFromMap(
+        options.url, baseParams);
+    imageUrlFunction = ol.ImageUrlFunction.createBboxParam(url);
+  } else {
+    imageUrlFunction =
+        ol.ImageUrlFunction.nullImageUrlFunction;
+  }
+
+  goog.base(this, {
+    attributions: options.attributions,
+    crossOrigin: options.crossOrigin,
+    extent: extent,
+    projection: projection,
+    resolutions: options.resolutions,
+    imageUrlFunction: imageUrlFunction
+  });
+
+  /**
+   * @private
+   * @type {ol.Image}
+   */
+  this.image_ = null;
+
+  /**
+   * FIXME configurable?
+   * @private
+   * @type {number}
+   */
+  this.ratio_ = 1.5;
+
+};
+goog.inherits(ol.source.SingleImageWMS, ol.source.ImageSource);
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.SingleImageWMS.prototype.getImage =
+    function(extent, resolution) {
+  resolution = this.findNearestResolution(resolution);
+
+  var image = this.image_;
+  if (!goog.isNull(image) &&
+      image.getResolution() == resolution &&
+      image.getExtent().containsExtent(extent)) {
+    return image;
+  }
+
+  extent = new ol.Extent(extent.minX, extent.minY,
+      extent.maxX, extent.maxY);
+  extent.scale(this.ratio_);
+  var width = extent.getWidth() / resolution;
+  var height = extent.getHeight() / resolution;
+  var size = new ol.Size(width, height);
+
+  this.image_ = this.createImage(extent, resolution, size);
+  return this.image_;
+};