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 Zoom In limitation blocks Zoom Out at 100%
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aleatprog

21 Posts

Posted - Dec 22 2018 :  08:34:02  Show Profile  Reply
Hi,

I limited ImageEnView zooming in the range min 15% - max 1000%. Inside the range 15-1000 the mouse acts correctly allowing to zoom in up to 1000% and to zoom out down to 15%.

Values major to 1000 are limited using the ZoomIn event:

if NewZoom > 1000 then NewZoom := 1000;

Problem: Once the mouse zooms outside the maximum range (e.g. 1050%), it's not longer possible to zoom out down to 15% but it blocks at 100%.

May you tell me what causes this behaviour?

Thank you in advance,
Al

aleatprog

21 Posts

Posted - Dec 22 2018 :  09:02:39  Show Profile  Reply
Found the answer:

MouseWheelParams.Variation := iemwAbsolute;
MouseWheelParams.Value := 100;

Therefore, the limitation set the zoom rate to 1000% and zooming out blocked at 100% for its Value.

Everything's fine. Have a nice Xmas. : )

Al
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xequte

4538 Posts

Posted - Dec 24 2018 :  14:08:26  Show Profile  Reply
Nice work, Al,

You have a great Xmas too.

Nigel
Xequte Software
www.imageen.com
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