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Picturebox: repainting only a certain area

Posted on 2001-06-22
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Last Modified: 2008-03-17
Hi,

Can anyone tell me how i can redraw/repaint only a certain area of a picturebox? thanks.
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Question by:3Mann
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4 Comments
 
LVL 2

Expert Comment

by:Microsoft
ID: 6217388
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LVL 2

Expert Comment

by:Microsoft
ID: 6217398
Syntax 1
public void repaint()
Description
Repaints this component.
This method causes a call to this component's update method as soon as possible.


See Also
update





Syntax 2
public void repaint( long tm )
Parameters
tm
maximum time in milliseconds before update
Description
Repaints the component. This will result in a call to update within tm milliseconds.

See Also
paint, update





Syntax 3
this explains how to use repaint
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Accepted Solution

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RodStephens earned 50 total points
ID: 6218201
If you keep an image of the surface somewhere like a hidden PictureBox, you could use PaintPicture to refresh the area you want.

Or you could use the API to set a clipping region to include the area you want to refresh. Then if you redraw everything, only the part in the clipping area gets drawn. Depending on the picture, this may be slightly faster than redrawing everything. (PaintPicture will be much faster).

However, in any case you will need some way to know what area to refresh and VB doesn't normally provide that.
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LVL 22

Expert Comment

by:rspahitz
ID: 6219198
If you have a specific image that you want on a portion of the picture, you can simply place the image into a frameless ImageBox and it will appear to be in the PictureBox.
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