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# Set initial zoom level of the 3D chart?

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GPJ asked on 29 Apr 2009, 03:58 PM
How can I set the initial zoom level of the 3d chart?  In my situation, the 3D pie chart fills only a small fraction of the available space available.  The user can't interact with the chart, so it needs to happen when the chart gets created.

Thanks
Greg

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Dwight
Telerik team
answered on 30 Apr 2009, 10:56 AM
Hello Greg,

Here is an example, in which I have created a method that zooms the chart by a factor (by calculating new position for the camera):
 public partial class Window1 : Window { private double[] data = new double[] { 12, 50, 11, 44, 55, 77 }; public Window1() { Random r = new Random(0xa713); InitializeComponent(); DataSeries series = new DataSeries(); series.Definition = new Pie3DSeriesDefinition(); foreach(double value in this.data) series.Add(new DataPoint() { YValue = value }); chart1.DefaultView.ChartArea.DataSeries.Add(series); this.Loaded += OnLoaded; } private void OnLoaded(object sender, RoutedEventArgs e) { ZoomChartArea(chart1.DefaultView.ChartArea, 2); } private static void ZoomChartArea(ChartArea chartArea, double zoom) { Viewport3D viewport3D = chartArea.Template3D.FindName("PART_ViewPort3D", chartArea) as Viewport3D; if (viewport3D == null) return; PerspectiveCamera camera = viewport3D.Camera as PerspectiveCamera; if (camera == null) return; Vector3D vector = (Vector3D)camera.Position; Vector3D lookDirection = camera.LookDirection; lookDirection.Normalize(); lookDirection *= (vector.Length - vector.Length / zoom); Point3D newPosition = (Point3D)(vector + lookDirection); PerspectiveCamera newCamera = camera.Clone(); newCamera.Position = newPosition; viewport3D.Camera = newCamera; } }

Let me know if that solution is not suitable for your case.

Best regards,
Evtim
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Dwight
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