Exporting a Chart to Image with prefered size

[Patric Svensson]

Hi,

I am trying to export a RadChart to an image using myRadChart.ExportToImage(stream). This all works very well but I want to change the size of the output image.

So I tried doing:

myChart.Width = 800;
myChart.Height = 600;
myChart.ExportToImage(stream);

However, the output image is still as big as the current browser view is.

Is there a way around this?

Thanks

[Petar Marchev]

Hello Patric,

This is more of a architecture's limitation. If you attempted the same with any other Silverlight control (such as Button) then you would get the same result. This is because even though you are changing the size - a layout pass has not been performed. This is the reason we do not support such a functionality out-of-the-box.
 
However, I can suggest that you try this: wrap the export (and the dispose) in a Dispatcher Invoke. This will delay the export and may be a layout update pass will occur. I have tried this in a simple example and it works. Code below should help:

myChart.Width = 800;

myChart.Height = 600;

 

Dispatcher.BeginInvoke(() =>

{

  myChart.ExportToImage(stream);
   // stream.Close();

});

Another thing you can try is to force the LayoutUpdate:

myChart.Width = 800;
myChart.Height = 600;

myChart.UpdateLayout();
myChart.ExportToImage(stream);

I would like to note again that this is a framework's limitation and this is really a hacky way to go around it, so make sure you test this thoroughly before you ship your product.

All the best,
Petar Marchev
the Telerik team

[shankar parshimoni]

hello patric ,can you able to place the code here.

[Petar Marchev]

Hello Shukreya,

I have attached a simple project that demonstrates the two approaches.

Kind regards,
Petar Marchev
the Telerik team