Solved

Using TJPEGImage.Scale in Delphi 3

Posted on 2000-02-16
9
814 Views
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?

0
Comment
Question by:michaelhiggins
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
9 Comments
 
LVL 2

Expert Comment

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

Good luck

Aubs
0
 

Author Comment

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


Michael
0
 
LVL 13

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;
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 3

Expert Comment

by:bryan7
ID: 2528197
he could better assign the jpg to a TImage so he can more easily handle it..
0
 
LVL 13

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...
0
 
LVL 13

Accepted Solution

by:
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;
0
 

Author Comment

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

Michael
0
 
LVL 13

Expert Comment

by:Epsylon
ID: 2543299
Any success?
0
 

Author Comment

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

Michael

0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Help on project with Soap 10 63
How to call a form that is in a DLL  from an application? 13 87
update joined tables 2 63
Twebbrowser add css to the header 3 39
A lot of questions regard threads in Delphi.   One of the more specific questions is how to show progress of the thread.   Updating a progressbar from inside a thread is a mistake. A solution to this would be to send a synchronized message to the…
The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
Are you ready to implement Active Directory best practices without reading 300+ pages? You're in luck. In this webinar hosted by Skyport Systems, you gain insight into Microsoft's latest comprehensive guide, with tips on the best and easiest way…

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question