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Using TJPEGImage.Scale in Delphi 3

Posted on 2000-02-16
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Last Modified: 2008-03-03
I want to use the scale feature of TJPEGImage to display a thumbnail image. However, I can't seem to get it to work, where ever I put it. Has anyone used this feature sucessfully?

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Question by:michaelhiggins
9 Comments
 
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Expert Comment

by:aubs
ID: 2527493
Look in delphi\help\examples\jpeg

Good luck

Aubs
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Author Comment

by:michaelhiggins
ID: 2527562
Thanks, but I do not have a folder in \examples called jpeg.


Michael
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Expert Comment

by:Epsylon
ID: 2527762
I'm not sure if all this works in Delphi 3 but give it a go.


Uses JPEG;

procedure TForm1.Button1Click(Sender: TObject);
var j: TJPEGImage;
    b: TBitmap;
begin
  b := TBitmap.Create;
  j := TJPEGImage.Create;
  j.LoadFromFile('spidersm.jpg');
  j.Scale := jsQuarter;
  b.Assign(j);
  Canvas.Draw(100, 100, b);
  j.Free;
  b.Free;
end;
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Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

 
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Expert Comment

by:bryan7
ID: 2528197
he could better assign the jpg to a TImage so he can more easily handle it..
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Expert Comment

by:Epsylon
ID: 2528243
That is a possibility.

  j := TJPEGImage.Create;
  j.LoadFromFile('spidersm.jpg');
  j.Scale := jsQuarter;
  Image1.Picture.Bitmap.Assign(j);
  j.Free;


It's just what you want to do with it...
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LVL 13

Accepted Solution

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Epsylon earned 200 total points
ID: 2533210
Uses JPEG;

procedure TForm1.Button1Click(Sender: TObject);
var j: TJPEGImage;
    b: TBitmap;
begin
  b := TBitmap.Create;
  j := TJPEGImage.Create;
  j.LoadFromFile('spidersm.jpg');
  j.Scale := jsQuarter;
  b.Assign(j);
  Canvas.Draw(100, 100, b);
  j.Free;
  b.Free;
end;
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Author Comment

by:michaelhiggins
ID: 2534692
Thanks for your comments - I will try them out this weekend.

Michael
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LVL 13

Expert Comment

by:Epsylon
ID: 2543299
Any success?
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Author Comment

by:michaelhiggins
ID: 2543625
Yes, It worked fine. Thanks

Michael

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3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

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