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Dundas Gauge - Setting pointer values

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I was having trouble getting Dundas Gauge for ASP.NET to reflect the value that I was assigning it. For some reason, the needle always pointed to the default 0. I was using this code:

//create circular gauge
GaugeContainer gauge = new GaugeContainer();
CircularGauge circleGauge = new CircularGauge();
gauge.CircularGauges.Add(circleGauge);

//scale
CircularScale scale = new CircularScale();
scale.Minimum = -100;
scale.Maximum = 100;
circleGauge.Scales.Add(scale);

//pointer
CircularPointer pointer = new CircularPointer();
pointer.Type = CircularPointerType.Needle;
pointer.Value = 10;
circleGauge.Pointers.Add(pointer);

//display
gauge.ImageType = ImageType.Png;
gauge.Width = new Unit(200);
gauge.Height = new Unit(200);
gauge.Page = Page;
gauge.RenderType = Dundas.Gauges.WebControl.RenderType.BinaryStreaming;
gauge.RenderControl(writer);

So “pointer.Value = 10;” was not working. After looking at some examples, I figured out that this worked:

gauge.CircularGauges[0].Pointers[0].Value = 10;

I’m not sure what the difference is, but give it a try if you’re having a similar problem.

2 Responses to “Dundas Gauge - Setting pointer values”

  1. Anwar Says:
    July 30th, 2008 at 2:15 am

    Thanks for the code. This has helped me in getting started with Gauges.

  2. Graham Evans Says:
    October 8th, 2008 at 8:00 am

    The reason I think you got the problem was because you added the circular gauge to the gauge container before adding the scale and pointer to the circular gauge.

    I think gauge.CircularGauges.Add(circleGauge); should have been one of the last instructions.

    The code you used…
    gauge.CircularGauges[0].Pointers[0].Value = 10;

    can only be used when you already have a pointer created, if you have no pointers the index will be out of bounds.

    Regards

    Graham

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