Portal vector realignment

I just added some portals to my platformer game. However I want to achieve proper redirection of vectors (speedy thing goes in, speedy thing comes out)

The portals are side on (as in, attached to the walls.

All I need is direction/advice on the trig I need to do.

If you are using Platform behavior you can get the Sprite.speed as it collides with the portal. Then assign that number to a global variable. When the sprite spawns at the new portal assign the speed back to the sprite. (I think that would work...)

Something similar works for Physics.

I don't think that would work, because you need to consider the angle of both portals as well...

hmm...

Portal Math Example:

http://dl.dropbox.com/u/5426011/examples%209/portal.capx

R0J0hound, you have done it again. Many thanks.

Kyatric this would be good for the FAQ I'm sure.

Added.

What about an object without platform behavior?

Im trying to do with an object with physics behavior (only) and i cant do it :S

ByR You'll need to store its X and Y vectors in two variables at portal entry, then destroy the old object and create the new one at the portal, setting its vectors again with R0j0's algorithm.

Vectors are parameters from the platform behavior so i cant get these.

I tried applying a new impulse (impulse with XY and impulse at angle) using the physics.VelocityX and physics.VelocityY but the force is like 50 times stronger, the angle its ok.

Sorry for my english :)

ByR You'll want to use the 'set velocity' action which allows you to set X and Y components.

Thanks a lot :)

ByR no problem, glad I could help.

R0J0hound nice one I like it

This is a very nice example, rojo, you hit another fine spot again. That simple yet elegant solutions...