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How to set TImage size and clear TImage picture?

Posted on 2005-03-03
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Last Modified: 2008-01-09
I have two TImages, "source" is for picture itself, "grid" is for draw grid with transparent=true, so that the "source" can be viewed. My question as below:
1. When  picture is loaded into "source" ,
source.Picture.Graphic := Bitmap;

how do I set "grid" to the same size with "source? next code seems doesn't work.
grid.Width := Bitmap.Width;
grid.Height := Bitmap.Height;

2. How can I clear all grid what I drawed in "grid".
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Question by:mikezang
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9 Comments
 
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Accepted Solution

by:
Pierre Cornelius earned 100 total points
ID: 13456659
1.)
grid.Width:= source.width
grid.Height:= source.height

2.) grid.clear
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LVL 14

Expert Comment

by:Pierre Cornelius
ID: 13456675
Sorry, the second suggestion is wrong to clear a image. Try this rather:

  grid.Canvas.Brush.Color:= clBtnFace; //or whatever color you want as the background
  grid.Canvas.Pen.Color:= clBtnFace;
  grid.Canvas.Rectangle(Image1.ClientRect);
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Assisted Solution

by:zion29
zion29 earned 100 total points
ID: 13456815
If it is a standard canvas, a "grid.canvas.repaint" should be enough. :)
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LVL 5

Author Comment

by:mikezang
ID: 13456906
if a file is loaded into source, then I drawed something on it, then load file again, is my drawing also cleared?
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LVL 14

Expert Comment

by:Pierre Cornelius
ID: 13456946
Yes
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Expert Comment

by:Pierre Cornelius
ID: 13456951
Unless you save the file with your changes before loading it again.
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LVL 22

Expert Comment

by:Mohammed Nasman
ID: 13459362
to clear image box, try

Image.Picture.Assign(nil);
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