statusbar - mask instead of resize

[szoltomi]

Hello!

I've just started using oUF to make a custom layout by first modifying others work, then stripping them down, and adding my ideas.
A problem I ran into very early on, the texture of statusbars is shrinked as they deplete, instead of getting their end "cut off" or masked. Could someone explain it how to make one simple healthbar on the player frame this way? I could work on it later then.

I checked out this thread, then tried to understand it from Zork's D3 addon, but it's a bit too big and complex, and I get lost when I try to understand it.

Thanks for the help!