I'm just trying to pull off a simple rotation. I think the problem originates with the unchanging rotation variable...

[DraymondDarksteel]

It really seems like it should be easier to pull off than this, doesn't it? In any case, I'm having... immense difficulty figuring out how to rotate something.

This is the relevant code, in my screens.rpy.

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transform rotateshort:
    rotate (284 - minutes) / 284 * 360

transform alpha_dissolve:
    xpos 0.85
    ypos 0.2
    xanchor 0.5
    yanchor 0.5
    alpha 0.0
    linear 0.5 alpha 1.0
    on hide:
        linear 0.5 alpha 0
    ##This is to fade in the clock.

screen ticktock:
    add "clockback.png" at alpha_dissolve
    add "clockhand.png" at alpha_dissolve, rotateshort 

The relevant variable, is declared in variable.rpy, in the following format...

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init:
    $ minutes = 284

And, finally, the value of minutes is modified elsewhere, in a custom file, 01functions.rpy, where it says...

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label addtime(amount):
    show screen ticktock
    play sound "sounds/ticktock.wav"
    pause(2)
    $ minutes -= amount * 20
    halt ""
    hide screen ticktock
    return

I created this as a custom function, because I'm expecting to use it multiple times. The rest of the function is called, and executes, correctly, so I don't know what the malfunction is here. The clock simply isn't rotated at all, and, for some reason, it appears on the left hand side of the screen instead of the right hand the first time the ticktock screen is run. But only the first time. Of note, however, is that the image will rotate if I replace "(284 - minutes) / 284 * 360" with an actual number. So the problem must be in minutes... somehow. I've confirmed elsewhere that the minutes variable does actually decrease when that addtime function is called, so I really can't understand what I'm doing wrong. Still, if you can, please help. I've been going insane trying to figure this out all day.

[philat]

Make minutes a parameter in the transform.

[Randomiser]

I think there's a sneaky math error going on.

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(284 - minutes) / 284 * 360

(284 - minutes) / 284 is guaranteed to be less than 1. However, because 284 and minutes are both integers, python rounds this down to 0! You can write either 284 or minutes as a float to force it to retain accuracy.

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rotate (284 - minutes) / 284.0 * 360

will return a float instead of 0.

[DraymondDarksteel]

I think there's a sneaky math error going on.

Yes, that was it! There was an additional problem in that the screen wasn't updating, but I've solved that too. Thank you very much!