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Copying bmps to to TImage

Posted on 2000-05-12
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Last Modified: 2010-04-04
Hi,

I think one of my marbles is a bit loose!:-)

I am trying to copy a section of a bmp from a TImage to another TImage using CopyRect. Why can I only see the copied image if I have an existing bmp in the destination TImage? I addition the copied bmp will only overlay the parts of the image currently covered by the existing bmp.

How can I just copy the section of the source bmp in the TImage to the destination TImage with no pre-existing bmp?

Regards

Chris
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Question by:ChrisBerry
5 Comments
 
LVL 5

Accepted Solution

by:
TheNeil earned 200 total points
ID: 2804013
Have you set the dimensions of the destination bitmap before you did the copy?

Image1.Picture.Bitmap.Width := ...

The Neil =:)
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LVL 4

Expert Comment

by:BoRiS
ID: 2804134
ChrisBerry

Does your code look anything like this, cause I just wrote this and it worked fine

var
  Bitmap: TBitmap;
  FirstRect, OtherRect: TRect;
begin
  FirstRect := Rect(0, 0, 10, 10);
  OtherRect := Rect(10, 10, 30, 30);
  Bitmap := TBitmap.Create;
  Bitmap.LoadFromFile('c:\windows\bubbles.bmp');
Form1.Canvas.CopyRect(OtherRect, Bitmap.Canvas, FirstRect);
  Bitmap.Free;
end;

Later
BoRiS
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LVL 20

Expert Comment

by:Madshi
ID: 2804997
Hi BoRiS, nice to see you...   :-)
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LVL 4

Expert Comment

by:BoRiS
ID: 2805013
Hi Madshi

Good to be back ;-)

Later
BoRiS
0
 

Author Comment

by:ChrisBerry
ID: 2806423
Hi all,

Thanks for your replies.

Neil was right, I was setting the TImage width/height not the bitmap.

BoRiS, yes I did get that to work. My problem was with TImage not form canvas.

Thanks

Chris
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