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 Stretch image not working		  New Topic  Reply to Topic
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jwest

Brazil
67 Posts
Posted - Mar 22 2018 :  11:04:07  Show Profile  Reply
Hi, I have a camera and I need to grab a frame to ImageEnView Control.

I have set autofit, autostretch and autoshrink to false in my target ImageEnView(to receive the copied frame).

But, After I copied the image from camera to ImageEnView Control the image
shows with scrollbar and much bigger than container dimensions.

If I grab the frame a second time, the image shows correctly without scrollbars and the stretch is ok.

How could I fix it?

var ImageEnViewFoto, ImageEnViewCamera:TImageEnView;
....
procedure TfrmFrameCliente.ImageEnViewCameraDShowNewFrame(Sender: TObject);
begin
// copy current sample to ImageEnView bitmap
ImageEnViewCamera.IO.DShowParams.GetSample(ImageEnViewCamera.IEBitmap);
ImageEnViewCamera.Stretch;
// refresh ImageEnView1
ImageEnViewCamera.Update;
end;

procedure TfrmFrameCliente.grabframe();
begin
ImageEnViewFoto.AutoFit:=false;
ImageEnViewFoto.AutoStretch:=false;
ImageEnViewFoto.AutoShrink:=false;
ImageEnViewFoto.IEBitmap.Assign(ImageEnViewCamera.IEBitmap);
ImageEnViewFoto.Stretch;
ImageEnViewFoto.Update;
end;

xequte

38222 Posts
Posted - Mar 22 2018 :  14:21:07  Show Profile  Reply
Hi

Stretch has no effect if the image is larger than the ImageEnView. I think Shrink is the method you want to use.



Nigel
Xequte Software
www.imageen.com
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jwest

Brazil
67 Posts
Posted - Mar 22 2018 :  19:18:55  Show Profile  Reply
if I grab the frame two times all works well. Why?
How to do ImageEnView stretch works like TImage stretch?
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xequte

38222 Posts
Posted - Mar 22 2018 :  20:20:13  Show Profile  Reply
Hi

Do you mean that you want to stretch the image without painting the aspect ratio? (i.e. no border area even if the content is stretched unevenly).

You can do that as follows:

// Stretch without maintaining the aspect ratio
ImageEnView.GetIdealZoom( ZoomX, ZoomY );
ImageEnView.ZoomX := ZoomX;
ImageEnView.ZoomY := ZoomY;


Nigel
Xequte Software
www.imageen.com
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