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# Showing Percentage

Posted on 2003-02-22
Medium Priority
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This is simple math question (I stink at math)

I'm adding translucency to my application, and I want to use a trackbar or dropdown to let the user select the visibility of forms in the application.

I set the max on my trackbar to 255 and when you slide it the translucency changes on the form.

255 is 100% visible, 0 is 0% visible.

What I want to do is put the percentage of visibilty into an integer so I can display it on a label or something, indicating what "percentage of visibilty" the form has.

Also, I'd lide a way to calculate all the in-between percentages, just in case I decide to go with a dropdown.

Thanks!
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Question by:Psylord
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Slaugh earned 200 total points
ID: 8001560
Put Math in your Uses then

procedure TForm1.TrackBar1Change(Sender: TObject);
begin
label1.caption := 'Percentage = '+ floattostr(roundto(trackbar1.Position /255 *100, -2)) + '%';
end;
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LVL 6

Expert Comment

ID: 8001561
100 / 255 * TrackBar1.Position ?

Markus
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LVL 6

Expert Comment

ID: 8001569
Damn! ;-)
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Expert Comment

ID: 8001669
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