Script inside screen executed in order

[Lezalith]

Hey everyone,
I need a little help with this. Sadly, this is more Python-y than Ren'py-y thing.

I have a screen.
There are variables stated when entering the screen: Activation, Affection, Mid, PointsA, PointsB, SetA, SetB, NewPointsA, NewPointsB.
There is a bar inside the screen, representing the PointsA or PointsB variables (Depending if SetA = 1 or SetB = 1).
What I need to do, I need to run a "script", which will do the following actions:

Start if Activation = 1
Mid = (1+Affection)*6
(Affection is further counted from 2 variables, but I feel like that can be done outside of the script)

If SetA = 1
NewPointsA = PointsA + Mid
(Following into)
PointsA = NewPointsA

(Same thing with B)
If SetB = 1
NewPointsB = PointsB + Mid
(Following into)
PointsB = NewPointsB

It is pretty straight forward. Mid is counted from few variables, then added to already existing variable, depending on which one is set (A or B).
What I need is to divide the "adding" process into 3 to 5 parts, and "play" them all, so the bar representing PointsA or PointsB will change 3 to 5 times, increasing.

Example: Let's say Mid = 5. SetA = 1, thus PointsA is the value that will be increased. PointsA already = 5.
PointsA would increase to 6, decreasing Mid to 4. Bar increases.
PointsA would increase to 7, decreasing Mid to 3. Bar increases.
PointsA would increase to 8, decreasing Mid to 2. Bar increases.
PointsA would increase to 9, decreasing Mid to 1. Bar increases.
PointsA would increase to 10, decreasing Mid to 0. Bar increases.
The game can now continue.

I guess I could do this on my own, I just don't know how to write code so it processes in order, not all at once. Guess I could do jump after each line of action with variable, so it would be somewhat done in order, but there has to be an easier way.

Also, how do you set a variable so it can be only equal to 0 and greater?

[philat]

You're looking for AnimatedValue. Search the forums and documentation on how to use it.