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Date Posted: 09:52:46 12/08/03 Mon
Author: Dave Bracken
Subject: Re: You have probably already answered this but...Help!
In reply to: Michel 's message, "Re: You have probably already answered this but...Help!" on 22:52:33 12/07/03 Sun

Michel,
I saw that in the demo, and i use it in my Zoom In function. But im not sure if that applies to the other situation. I am using the zoom to selection function. If a user selects a very small area and selects zoom to slection, i want to make sure that it does not try to zoom in too much. So, i guess my question is really:
How do i determine the size that the zoom will become on a zoomtoselection call so that i may limit it?

Thanks in advance,
Dave



>
>Hi Dave,
>
>The ZoomChange is triggered after the zoom is changed
>so it does not help you to prevent the change. You
>should simply apply the same logic when assign a new
>zoom value to the TImageScrollBox.ZoomPercent
>property. For example, in the DemoForm.Pas example,
>this is done in the TMainForm.ZoomEditChange method.
>
>Best regards,
>
>Michel
>
>
>
>>I need to know how to limit zooming in on an image to
>>a certain percent. I tried testing the zoompercent in
>>onzoomchanged, but that did not work. You can see it
>>in the following code:
>>
>>procedure TForm1.ImageScrollBox1ZoomChange(const
>>Sender: TImageScrollBox;
>> const Zoom: Single);
>>begin
>> if ZoomedMax then begin
>>
>> exit;
>> end;
>> if ImageScrollBox1.ZoomPercent > 200 then begin
>> Screen.Cursor := crHourGlass; //this also does not
>>work?
>> Application.ProcessMessages;
>> ImageScrollBox1.ZoomPercent := 200;
>> ZoomedMax := true;
>> Screen.Cursor := crDefault;
>> end;
>>
>> Hpos := ImageScrollBox1.HorzScrollBar.Position;
>> Vpos := ImageScrollBox1.VertScrollBar.Position;
>>end;
>>
>>I tried to look through your example, and could not
>>find any indication there either.
>>I need to limit this because it severely slows down my
>>system, and takes up quite alot of memory to zoom very
>>large.
>>
>>I would appreciate any help you can give.
>>
>>Thanks,
>>Dave

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