c# - Popup dimensions on screen -

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i thought understood wpf content scaling system ran issue that's mysterious me. have simple popup supposed used loupe opens on top of image when user clicks image. xaml this:

    <popup name="loupepopup" allowstransparency="true" isopen="false" staysopen="true">         <border borderthickness="2" borderbrush="azure" />     </popup>

in code behind, tie popup's placement image showing when popup opened. set loupe size half size of image code:

    loupepopup.placementtarget = fullimg;     loupepopup.placement = placementmode.relative;     loupepopup.width = fullimg.actualwidth / 2;     loupepopup.height = fullimg.actualheight / 2;

further code moves loupe along mousemove, not relate issue here: i'd expect loupe half width/height of image, not - quite bit larger (by 18%). verified actual image size , actual size of window on displayed, mouse coordinates. dimensions/point coordinates made perfect sense, why popup not use same width/height scaling other elements here?

for clarification: image covers 80% or of screen, not issue of few pixels. window child window created in code, , popup defined in xaml of main window, both windows set full screen size.

appreciate thoughts!

maybe because border thickness not taking account when calculating loupepopup size or default margin , padding of popup or image


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