Tee Chart as Thumb Nail

Areef · Post by **Areef** » Mon May 21, 2007 6:55 am

Hi,

I want to display the Tee Chart which I am already exporting as PNG Image as Thumb Nail version. Can some one tell me how can I do so?

Thanks,
Areef

Narcís · Post by **Narcís** » Mon May 21, 2007 8:11 am

Hi Areef,

When exporting a chart to an image you can specify the size of the image you want to generate, for example:

Code: Select all

    TChart1.Export.asPNG.Height = 20
    TChart1.Export.asPNG.Width = 50

Areef · Post by **Areef** » Mon May 21, 2007 8:42 am

Hi Narcís,

It does NOT help me. My Tee Chart is best viewed at 720*360 (Width*Hieght) size. Now, I want the same Image to be available in smaller size of say 50*20. if I change the Width and Height as suggested by you here, the Image is LOST and only some portion of the Image is shown.

Thanks and Regards,
Areef

Narcís · Post by **Narcís** » Mon May 21, 2007 8:48 am

Hi Areef,

Then you could save the chart's size in temporary variables, resize it to 50*20, export the chart and resize the chart again to the original dimensions.

Areef · Post by **Areef** » Mon May 21, 2007 8:58 am

I think I did't get exactly what you wanted me to do.

My code is as follows.

Code: Select all

	
tchart.Export.asPNG.Width = 720;
tchart.Export.asPNG.Height = 360;
return ((byte[]) tchart.Export.asPNG.SaveToStream());

I want this same code to be running in 2 modes, one mode while exporting as Full Image and another mode to export as Thumb Nail basically a smaller view of the same Image.

Could you help me in re-arranging the code so that I achieve my task?

Thanks again and Regards,
Areef

Narcís · Post by **Narcís** » Mon May 21, 2007 9:08 am

Hi Areef,

My suggestion was something like this:

Code: Select all

    Dim tmpW, tmpH As Integer
    
    tmpW = TChart1.Width
    tmpH = TChart1.Height
    
    'Export chart
    TChart1.Export.asPNG.SaveToFile FileName
    
    'Export thumbnail
    TChart1.Width = 50
    TChart1.Height = 20
    TChart1.Export.asPNG.SaveToFile ThumbnailName
    
    'Restore original chart dimensions
    TChart1.Width = tmpW
    TChart1.Height = tmpH

Areef · Post by **Areef** » Mon May 21, 2007 9:21 am

When I am exporting in one style/mode I am not worried about the other style/mode.

When I am in Full Image Modei will export as Full Image only and not worried about Thumb Nail version and similarly when I am in Thumb Nail mode, I will export as Thumb Nail only and dont bother to resize back to normail Image mode.

So, my code snippet would be like this.

Code: Select all


If (ExportAsFullImage)
{
   tchart.Export.asPNG.Width = 720;
   tchart.Export.asPNG.Height = 360;
   return ((byte[]) tchart.Export.asPNG.SaveToStream());
}
else if (ExportAsThumbNail)
{
   tchart.Export.asPNG.Width = 70;
   tchart.Export.asPNG.Height = 60;
   return ((byte[]) tchart.Export.asPNG.SaveToStream());
}

If you observe here, I am not deling here with File Names at all and am exporting to stream and this stream is written to screen. I tried with this code only and when I am exporting as Thumbnail, the Image gets clipped rather than showing as a small Image.

I was wondering does the Zoom or CompressionLevel properties help me in any way?

Regards,
Areef

Narcís · Post by **Narcís** » Mon May 21, 2007 9:31 am

Hi Areef,

Please notice that the code I posted actually resizes the chart, not the exported image. Could you please try if it works fine at your end?

Thanks in advance.

Areef · Post by **Areef** » Mon May 21, 2007 9:46 am

I tried with the code as follows:

Code: Select all

          tchart.Width = 70;
          tchart.Height = 60;
          return ((byte[]) tchart.Export.asPNG.SaveToStream());

But, again here also the same result of clipping of the Image. is it correct what I am doing here?

Regards,
Areef

Post by **Pep** » Thu May 31, 2007 4:03 pm

Hi Areef,

yes, one way to accomplish it, as you said, would be using the Zoom. You will have to change the Zoom before to do the export :
TChart1.Aspect.Zoom = 150
or assign it to 100 depending on the choosed option.