From ede84739c4d54a4914944478b138727015d2933c Mon Sep 17 00:00:00 2001
From: Frederic Junod <frederic.junod@camptocamp.com>
Date: Mon, 16 Dec 2013 09:58:27 +0100
Subject: [PATCH] Add displayDpi option to ol.source.MapGuide constructor

---
 src/objectliterals.jsdoc        |  1 +
 src/ol/source/mapguidesource.js | 11 +++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/objectliterals.jsdoc b/src/objectliterals.jsdoc
index c6eec5c892..8f9a3053fc 100644
--- a/src/objectliterals.jsdoc
+++ b/src/objectliterals.jsdoc
@@ -635,6 +635,7 @@
 /**
  * @typedef {Object} olx.source.MapGuideOptions
  * @property {string|undefined} url The mapagent url.
+ * @property {number|undefined} displayDpi The display resolution. Default is `96`.
  * @property {number|undefined} metersPerUnit The meters-per-unit value. Default is `1`.
  * @property {ol.Extent|undefined} extent Extent.
  * @property {boolean|undefined} useOverlay If `true`, will use
diff --git a/src/ol/source/mapguidesource.js b/src/ol/source/mapguidesource.js
index 7c20c7468c..0a0d51cb1e 100644
--- a/src/ol/source/mapguidesource.js
+++ b/src/ol/source/mapguidesource.js
@@ -31,6 +31,13 @@ ol.source.MapGuide = function(options) {
     imageUrlFunction: imageUrlFunction
   });
 
+  /**
+   * @private
+   * @type {number}
+   */
+  this.displayDpi_ = goog.isDef(options.displayDpi) ?
+      options.displayDpi : 96;
+
   /**
    * @private
    * @type {number}
@@ -98,7 +105,7 @@ ol.source.MapGuide.prototype.getScale = function(extent, size) {
   var mcsH = ol.extent.getHeight(extent);
   var devW = size[0];
   var devH = size[1];
-  var dpi = 96;
+  var dpi = this.displayDpi_;
   var mpu = this.metersPerUnit_;
   var mpp = 0.0254 / dpi;
   if (devH * mcsW > devW * mcsH) {
@@ -127,7 +134,7 @@ ol.source.MapGuide.prototype.getUrl =
     'LOCALE': 'en',
     'CLIENTAGENT': 'ol.source.MapGuide source',
     'CLIP': '1',
-    'SETDISPLAYDPI': 96,
+    'SETDISPLAYDPI': this.displayDpi_,
     'SETDISPLAYWIDTH': Math.round(size[0]),
     'SETDISPLAYHEIGHT': Math.round(size[1]),
     'SETVIEWSCALE': scale,