Merge pull request #1236 from jumpinjackie/master

MapGuide untiled map support
2013-12-06 08:59:57 -08:00
parent 77a8e91a2e 60825f0f99
commit 0a5cc8812c
5 changed files with 227 additions and 0 deletions
--- a/src/ol/source/mapguidesource.exports
+++ b/src/ol/source/mapguidesource.exports
@@ -0,0 +1 @@
+@exportSymbol ol.source.MapGuide
--- a/src/ol/source/mapguidesource.js
+++ b/src/ol/source/mapguidesource.js
@@ -0,0 +1,125 @@
+goog.provide('ol.source.MapGuide');
+
+goog.require('goog.object');
+goog.require('goog.uri.utils');
+goog.require('ol.ImageUrlFunction');
+goog.require('ol.extent');
+goog.require('ol.source.Image');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.source.Image}
+ * @param {ol.source.MapGuideOptions} options Options.
+ */
+ol.source.MapGuide = function(options) {
+  var imageUrlFunction = goog.isDef(options.url) ?
+      ol.ImageUrlFunction.createFromParamsFunction(
+      options.url,
+      options.params,
+      goog.bind(this.getUrl, this)) :
+      ol.ImageUrlFunction.nullImageUrlFunction;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.metersPerUnit_ = options.metersPerUnit;
+
+  /**
+   * @private
+   * @type {boolean}
+   */
+  this.useOverlay_ = options.useOverlay;
+
+  /**
+   * @private
+   * @type {ol.Image}
+   */
+  this.image_ = null;
+
+  goog.base(this, {
+    extent: options.extent,
+    projection: options.projection,
+    resolutions: options.resolutions,
+    imageUrlFunction: imageUrlFunction
+  });
+};
+goog.inherits(ol.source.MapGuide, ol.source.Image);
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.MapGuide.prototype.getImage =
+    function(extent, resolution, projection) {
+  resolution = this.findNearestResolution(resolution);
+
+  var image = this.image_;
+  if (!goog.isNull(image) &&
+      image.getResolution() == resolution &&
+      ol.extent.containsExtent(image.getExtent(), extent)) {
+    return image;
+  }
+
+  extent = extent.slice();
+  ol.extent.scaleFromCenter(extent, 1.0); //this.ratio_);
+  var width = (extent[2] - extent[0]) / resolution;
+  var height = (extent[3] - extent[1]) / resolution;
+  var size = [width, height];
+
+  this.image_ = this.createImage(extent, resolution, size, projection);
+  return this.image_;
+};
+
+
+/**
+ * @param {ol.Extent} extent The map extents
+ * @param {ol.Size} size the viewport size
+ * @return {number} The computed map scale
+ */
+ol.source.MapGuide.prototype.getScale = function(extent, size) {
+  var mcsW = extent[2] - extent[0];
+  var mcsH = extent[3] - extent[1];
+  var devW = size[0];
+  var devH = size[1];
+  var dpi = 96;
+  var mpu = this.metersPerUnit_;
+  var mpp = 0.0254 / dpi;
+  var scale = 0.0;
+  if (devH * mcsW > devW * mcsH)
+    scale = mcsW * mpu / (devW * mpp); //width-limited
+  else
+    scale = mcsH * mpu / (devH * mpp); //height-limited
+  return scale;
+};
+
+
+/**
+ * @param {string} baseUrl The mapagent url.
+ * @param {Object.<string, string|number>} params Request parameters.
+ * @param {ol.Extent} extent Extent.
+ * @param {ol.Size} size Size.
+ * @param {ol.proj.Projection} projection Projection.
+ * @return {string} The mapagent map image request URL.
+ */
+ol.source.MapGuide.prototype.getUrl =
+    function(baseUrl, params, extent, size, projection) {
+  var scale = this.getScale(extent, size);
+  var baseParams = {
+    'OPERATION': this.useOverlay_ ? 'GETDYNAMICMAPOVERLAYIMAGE' : 'GETMAPIMAGE',
+    'VERSION': '2.0.0',
+    'LOCALE': 'en',
+    'CLIENTAGENT': 'ol.source.MapGuide source',
+    'CLIP': '1',
+    'SETDISPLAYDPI': 96,
+    'SETDISPLAYWIDTH': Math.round(size[0]),
+    'SETDISPLAYHEIGHT': Math.round(size[1]),
+    'SETVIEWSCALE': scale,
+    'SETVIEWCENTERX': (extent[0] + extent[2]) / 2,
+    'SETVIEWCENTERY': (extent[1] + extent[3]) / 2
+  };
+  goog.object.extend(baseParams, params);
+  return goog.uri.utils.appendParamsFromMap(baseUrl, baseParams);
+};