Add map rulers (#116)

Author: EugeniaSimonova

interface-elements-for-desktop/articles/map.md

@@ -10,4 +10,5 @@ The section describes the **Map** control's features and consists of the followi
 * [Selection](map/selection.md)
 * [Using the Search Panel](map/using-the-search-panel.md)
 * [Mini Map](map/mini-map.md)
-* [Map Editor](map/map-editor.md)
+* [Map Editor](map/map-editor.md)
+* [Rulers](map/rulers.md)

interface-elements-for-desktop/articles/map/rulers.md

@@ -0,0 +1,48 @@
+---
+title: Rulers
+author: Eugenia Simonova
+---
+
+# Rulers
+You can use rulers to measure distances and areas on a map.
+
+| Distance Ruler | Area Ruler | 
+|:---:|:---:|
+| ![Map Distance Ruler](../../images/map-ruler-distance.png) | ![Map Area Ruler](../../images/map-ruler-area.png)| 
+
+## Measure Distances
+
+Click  the ![Distance ruler button](../../images/map-ruler-distance-icon.png) button to create a ruler. This ruler calculates the distance between two or more points on a map. The total distance is shown in a map callout. Note that measurements ignore changes in elevation.
+
+![Create distance ruler](../../images/map-distance-ruler.gif) 
+
+Click an intermediate point on the ruler to see the distance to this point.
+
+![Show the distance to an intermediate point](../../images/map-ruler-intermediate-point.gif) 
+
+## Measure Areas 
+Click ![Area ruler button](../../images/map-ruler-area-icon.png) button to create an area ruler. This ruler calculates the area inside a polygon. The result is shown in a map callout.
+
+![Create distance ruler](../../images/map-area-ruler.gif) 
+## Configure Rulers
+
+After you add a ruler to a map, you can perform the following actions:
+
+* **Add a ruler point**.  Click the position on the ruler where you want to add a point.
+
+    ![ Add a ruler point](../../images/map-ruler-add-point.gif) 
+
+* **Change the ruler polyline**. Click and drag the point to a new location.
+
+    ![ Move a ruler point](../../images/map-ruler-move-point.gif)
+
+* **Delete a ruler point**. Double-click the ruler point. You can delete a point when the ruler contains more than two points. You can remove the entire ruler if it contains only two points.
+ 
+    ![ Delete a ruler point](../../images/map-ruler-remove-point.gif)
+
+
+## Remove Rulers
+
+You can click the cross button on the map callout that displays the measurement results to remove a ruler. 
+
+![Create distance ruler](../../images/map-ruler-remove.gif)