[Solved] Image disappears while linearly transforming it in a function

[Saa]

Edit: Figured out the issue! I have no idea why, but when in a transform function, instead of pixels, ypos is calculated in relation to the window size (so, if the window is 1280x720, 1280 is xpos 1.0 and 720 is ypos 1.0). That's why the image disappeared, it was off the screen in pixel 226800.


I need to use Python instead of ATL in an animation, but have no idea how to make that animation be linear (ideally it would be ellastic, but I can settle for linear or try to modify it once I learn how to do it linearly). At the moment this is my code:

Code: Select all

init python:
    import random
    def slotland1a(trans, st, at):
        landing = random.randint(0,3)*15 + 270
        trans.ypos = 315 - (315-landing)*st
        if st>1.0:
            return None
        else:
            return 0

Code: Select all

image slota:
    "slota.png"
    xpos 212
    ypos 315
    block:
        linear 0.5 ypos 270
        ypos 315
        repeat 5
    function slotland1a
    pause 1.0
    repeat

Problem is, while trans.ypos does get the desired values (I checked it on the console), the image completely disappears from the screen while slotland1a runs. I don't understand how that could possibly happen, but it does. (the image isn't visible if ypos is 0, so it could be defaulting to 0, but print trans.ypos always gives out the right values)

Can someone tell me what I'm doing wrong, or show me a different way to do linear warps on python?

[Saa]

I've tried using a while loop:

Code: Select all

def slotland1a(trans, st, at):
        landing = random.randint(0,3)*15 + 270
        while st<1.0:
            trans.ypos = 315 - (315-landing)*st
        return None

But that crashes my game. Whatever's wrong, it has to do with st, but I have no idea why.

I've also tried making a function just to return the landing value, but ATL only calls it once and then uses the same value every time it repeats. ypos has to be change in the transform function, and I can't find a way to do it lineraly...

[Remix]

Even though you solved it... a quick bit of info:

st is always a float ( seconds dot parts of a second ), so when you do the trans.ypos = 315 - (315-landing)*st bit it will always produce a float. You could have tried trans.ypos = int( 315 - (315-landing)*st ) btw