Issue with scrollrect


Hello there!
I am adding a graphic to a sprite and then assigning a scrollrect to it. The graphic scrolls just fine inside the sprite, but a copy of the exact same graphic appears underneath. What can be the issue?


Would you mind sharing a little bit of example code? Does it work as you expect on the Flash target?


My bad, something was bit off with my code and i could not reproduce it afterward. Everything seems normal now. Feeling dump for wasting your time asking :confused: . Just 1 question if you don’t mind. Is it possible to manipulate the scrollrect within the sprite without assigning a new rect to the sprite every frame?


sprite.scrollRect.x += 5;

And not do this:

var rect.x += 5;
sprite.scrollRect = rect;


Sadly no. When you access sprite.scrollRect, OpenFL returns a copy of the underlying object. Any changes you make to this object will be totally ignored.


Even if the Flash API is like that. Can we improve performance by avoiding creating a copy of the rectangle each time?
I don’t think it will break anything.

PS: I don’t have performance issue with scrollrect, it was just a thought.


Well i agree with “loudo”, there is no reason creating a new rectangle each time. I know that OpenFL mimics the Flash API but still it could be a good improvement.


Perhaps we can have one object instance we return, and re-use, with a define to disable, so it’s still different than our internal rectangle, but multiple calls would be the same