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Set initial zoom level of the 3D chart?

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This is a migrated thread and some comments may be shown as answers.
GPJ
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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
the Telerik team

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Dwight
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