Added new kb article diagram-center-items-rad-diagram (#618)

Co-authored-by: KB Bot <[email protected]>

Author: github-actions[bot]

knowledge-base/diagram-center-items-rad-diagram.md

@@ -0,0 +1,66 @@
+---
+title: Centering Items in RadDiagram
+description: Learn how to horizontally center items within the RadDiagram control in ASP.NET AJAX.
+type: how-to
+page_title: How to Center Shapes in RadDiagram for ASP.NET AJAX
+slug: diagram-center-items-rad-diagram
+tags: rad-diagram, asp.net-ajax, center, items, shapes
+res_type: kb
+ticketid: 1668422
+---
+
+## Environment
+
+<table>
+<tbody>
+<tr>
+<td>Product</td>
+<td>RadDiagram for ASP.NET AJAX</td>
+</tr>
+<tr>
+<td>Version</td>
+<td>all</td>
+</tr>
+</tbody>
+</table>
+
+## Description
+
+Centering items horizontally within the RadDiagram control is a common requirement. This task can be achieved by utilizing the `bringIntoView()` method of the underlying diagram widget. 
+
+This KB article also answers the following questions:
+- How to ensure all RadDiagram shapes are visible in the viewport?
+- How to automatically adjust the zoom to fit all shapes in RadDiagram?
+- How to use the `bringIntoView()` method with RadDiagram in ASP.NET AJAX?
+
+## Solution
+
+To center all or specific shapes within the RadDiagram's viewport, utilize the `bringIntoView()` method. This method can zoom out the diagram as needed to ensure all specified shapes fit within its viewport.
+
+Here's how you can implement this on the client-side `OnLoad` event of the RadDiagram:
+
+1. Define the RadDiagram in your ASP.NET AJAX page with a client-side `OnLoad` event handler:
+
+```asp
+<telerik:RadDiagram ID="RadDiagram1" runat="server">
+    <ClientEvents OnLoad="onLoad" />
+         ...
+</telerik:RadDiagram>
+```
+
+2. Implement the `onLoad` function in JavaScript to use the `bringIntoView()` method. Pass all diagram shapes to this method to ensure they are centered and visible in the diagram's viewport:
+
+```javascript
+function onLoad(diagram, args) {
+    var diagramWidget = diagram.get_kendoWidget();
+    diagramWidget.bringIntoView(diagramWidget.shapes);
+}
+```
+
+By passing the diagram's shapes to the `bringIntoView()` method, the RadDiagram will adjust its zoom level as needed to fit all shapes within the viewport, effectively centering them.
+
+## See Also
+
+- [RadDiagram Overview](https://docs.telerik.com/devtools/aspnet-ajax/controls/diagram/overview)
+- [bringIntoView() Method Documentation](https://docs.telerik.com/kendo-ui/api/javascript/dataviz/ui/diagram/methods/bringintoview)
+- [How to Show All Diagram Items So They Fit in the Viewport](https://www.telerik.com/support/kb/aspnet-ajax/diagrams/details/how-to-show-all-diagram-items-so-they-fit-in-the-viewport)