How do I create a magnifier-style mask?

Hello, I'm trying to create a magnifier effect with a mask and can't figure out how to do it.

my BG is a still image. On top another layer with my "magnified animation" now I want to create round mask so we don't see all 800x400 size animation, but rather the shape of a magnifier.

No matter how I put it, the layer underneath gets affected, which I don't want.

And it doesn't matter if I put "use own texture" . My mask is the top-most layer on the.. layer ;)

So technically I just want the mask to operate on my layer and not all the layers.

And is it normal that I don't see the result unless I run the project?

thx!

Marc.

It's funny.Totally unaware of that, i was working on a similar project.

https://www.construct.net/en/free-online-games/magnifying-glass-23047/play

LOL!! yeap! that's exactly what I'm looking for.. but i don't quite get the calculations? Do you understand it?

x = Self.X>960?960:(Self.X<0?0:Self.X)

y = Self.Y>519?519:(Self.Y<0?0:Self.Y)

thx!

Ah!!!! I got it !!! So the mask has to be way bigger than the screen so it covers everything!

Thanks! Still puzzled by your positioning code. ;)

Marc.

Self.X>960?960:(Self.X<0?0:Self.X)

If self.x is greater than 960, then set it to 960, else (if self.x is less than 0, set it to 0, else set it to itself

Nice!!!! OK now I get it.. that's pretty neat code instead of a bunch of If's

cheers!

Alternatively, clamp(0,self.x,960) should result in the same thing for this case.

True, this is more the command I am using and knew.