Set billboard opacity

Author: gberaudo

Cesium.externs.js

@@ -112,6 +112,7 @@ Cesium.BillboardCollection = function() {};
 /**
  * @typedef {{
  *   image: (string|HTMLCanvasElement|Image),
+ *   color: (Cesium.Color|undefined),
  *   verticalOrigin: (Cesium.VerticalOrigin|undefined),
  *   horizontalOrigin: (Cesium.HorizontalOrigin|undefined),
  *   position: !Cesium.Cartesian3
@@ -471,7 +472,7 @@ Cesium.CameraEventAggregator.prototype.isDestroyed = function() {};
 
 
 /**
- */
+*/
 Cesium.CameraEventAggregator.prototype.destroy = function() {};
 
 

ol3

@@ -787,9 +787,15 @@ goog.require('olcs.core.OlLayerPrimitive');
       }
       var center = geometry.getCoordinates();
       var position = olcs.core.ol4326CoordinateToCesiumCartesian(center);
+      var color;
+      var opacity = imageStyle.getOpacity();
+      if (goog.isDef(opacity)) {
+        color = new Cesium.Color(1.0, 1.0, 1.0, opacity);
+      }
       var bb = billboards.add({
         // always update Cesium externs before adding a property
         image: image,
+        color: color,
         verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
         position: position
       });