Press '1' to select the box
Press '2' to select the triangle
Use the MOUSE to control the movement
<SPACE> to stop
Thanks to @Scratchteam for curating and thanks to all the love and favs from you guys! I didn't realize it was featured, but I've read all the comments - even if I only gave short answers.
Also; If you want to have a go at it look at the challenge from @chooper-beta : https://scratch.mit.edu/projects/118500870/
Only filling the triangle within the borders of the box.
Continuation of my project "Draw Line Intersection" - this time with a filled triangle using my new tri-filler.