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Resize Image when resizing Form

Posted on 2009-05-18
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Last Modified: 2012-05-07
Hi I'd like to be able to resize an image1 while still keeping its aspect, when I resize the form.

so when I expand the form the image also expands, when I shrink the form the image also shrinks :)
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Question by:eNarc
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4 Comments
 
LVL 8

Expert Comment

by:BdLm
ID: 24418871
do you need to change the pixel size ?  There are many options for resize an image, from fast algo with low quality until excellent results using long calc time.

the cheap option is the stretch option in the image property
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Author Comment

by:eNarc
ID: 24420104
mostly its just the image1.height and image1.width that need changing because if I was to change the image draw on resize it would amount so much memory that it would probly stall the computer.


like how we would keep that of a panel in line with the rest of the form, neeting an image to remain in aspect at the same time staying within the form as it moves :)
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LVL 8

Expert Comment

by:BdLm
ID: 24420380
you my try that code, fast procedure,

how to use:  

         MynewBitMap := ResizeBMP(OldBMP, newh, neww);



function ResizeBMP(FromBit:  TBitmap; new_h, new_w  :  Integer) : TBitMap;
var    Target   :  TBitmap;
begin
 
 
   Target:=TBitmap.Create;
 
   Target.PixelFormat := pf24bit;
 
   if ((new_h>10)  and (new_w >10)) then
      begin
          Target.Height  :=  new_h;
 
          Target.Width   :=  new_w;
 
          Target.Canvas.StretchDraw(Rect(0, 0, Target.Width, Target.Height), FromBit);
 
      end;
 
   result := Target;
end ;

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Accepted Solution

by:
sidneye earned 500 total points
ID: 24422364
On your Timage set Proportional=True, Stretch=True, Align=alClient.  You may need to move other components to a panel that you align to an edge but this is all you need.
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