How to make a screen that changes during the game?

[Karizu]

Hi everyone, my problem is very simple, so I'm being as concise as possible.
In my project I have created a long series of the same screen with unlockable contents (a sort of homemade imagemap CG Gallery) and I wanted the screen to change every time I wrote a "flag" in the script (correct me if I'm using inapt words). So I tried using this code:

Code: Select all

screen extra_events:
    tag menu
    
    if persistent.unlock == "CG1":
        use extra_events_1
    if persistent.unlock == "CG2":
        use extra_events_2
    else:
        use extra_events_0

in the screen.rpy file, whit the relative screens, and this:

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$ persistent.unlock = "CG1"
$ persistent.unlock = "CG2"

in script.rpy, obviously each line located just before the different pictures appeared.

The problem is that if I use this kind of code, the only "persistent.unlock" string considered by renpy is the last one, so that if I don't go over the last "persistent.unlock" string playing the game, nothing in my events screen changes and the code "prints" the else command, making me see the "extra_events_0" screen. That being said, I understand this code won't work because the persistent can be used only with a choice menu to change the main menu appearance after a choice for example, but it actually seems strange to me that a variable system like the one I need doesn't exist at all. So, if you have some tips to tell me, I'd appreciate.
Thank you in advance.

[xela]

You prolly want if/elif/else, not if/if/else. And persistent works everywhere... not just in main_menu.

[Karizu]

Yes, you were totally right! This was the problem. Thank you very much, you definitely saved me.
So, if i use "elif" for the other variables , I sould be able to run my game correctly, am I right?
And I'm very sorry for the silly question but even If I did some researches, I can't actually catch what "elif" means exactly.

[xela]

http://stackoverflow.com/questions/9271 ... ifs-python

it will work if rest of the choices are just more options of the same.

[Karizu]

Ok, this makes sense. Thank you very much for your time, you were very helpful!

[Karizu]

Now I have another little question closely related to variables. I tried using some nested conditions, like this:

Code: Select all

screen extra_events:
    tag menu
    
    if persistent.unlock == "CG1":
        use extra_events_1
    elif persistent.unlock == "CG2":
        use extra_events_2
    elif persistent.unlock == "CG3":
        use extra_events_3
    elif persistent.unlock == "CG4":
        if persistent.unlock == "CG3":
            use extra_events_4
        else:
            use extra_events_4no3

but can't figure out what I'm doing wrong now. The error that the program gives me is the following:

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[code]
I'm sorry, but errors were detected in your script. Please correct the
errors listed below, and try again.


File "game/screens.rpy", line 542: u'else' is not a keyword argument or valid child for the screen statement.
    else:
        ^

Ren'Py Version: Ren'Py 6.99.10.1227

I have created a screen with CG3 and CG4 both unlocked, but CG3 is unlockable only by doing a particular choice, so that if you skip it, you should see the CG4no3 screen, where CG4 is unlocked but CG3 is not, and the gamer will understand that something's missing. I thought that this kind of nested conditions would have been reasonable, but this is the error, so I'm probably misunderstanding which the correct syntax is in this case.
Thank you in advance another time.

[Karizu]

Probably I better open a new topic with a new title for my new problem, just because I googled some key-words related to nested conditions in renpy but I couldn't find anything, so maybe it would be useful for some other people too. I'm also putting the tag "solved" on this particular topic.

[xela]

This looks ok unless I'm missing something... so it should just work.

[Karizu]

Yes, it should work to me too, but it doesn't. It continues giving me the error I posted before, as "else" weren't a valid child for an elif condition. At this point, I don't actually know how to fix it.

[Karizu]

Ok, I mange to solve the problem. It was caused by a simple unalignment issue caused by some bug in my editor. Thank you for your answers anyway, you were very helpful.