[Solved] Defining Variables In Screens

[haydengames3]

Hello, I've been trying to create a boolean inside of a screen to create a switch button, however when I create the variable at the start of the screen, it seemingly gets ignored and says that the variable doesn't exist. I've tried doing this without a vbox and it works fine, so I'm guessing it has something to do with the class. Is there a way to create a variable locally and/or globally in a screen that has these conditions such as vbox and frame?

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Thanks again to anyone who can help me with these issues, you are saving me from a lot of stress and I deeply appreciate it.

[Alex]

If you need to use a screen variable, then you should change it via SetScreenVariable action.

Code: Select all

scren test_scr():
    default my_screen_var = 0 # define screen variable
    default my_flag = False

    textbutton "Test: ([my_screen_var])":
        if not my_flag:
            action SetScreenVariable("my_flag", True)
        ellse:
            action [SetScreenVariable("my_screen_var", my_screen_var + 1), SetScreenVariable("my_flag", False)]

https://www.renpy.org/doc/html/screens.html#default
https://www.renpy.org/doc/html/screen_a ... enVariable

[haydengames3]

Ah, so it has it's own function, thank you for clearing this up. I do have another question, a screen is constantly updating, right? So if a variable is defined in a screen, wouldn't it get redefined over and over again?

[Alex]

... wouldn't it get redefined over and over again?

No, if you define it using 'default' statement in a screen; yes, if you set it like

Code: Select all

$ flag = True

When you hide the screen and show it again screen variables will get the default values.

[haydengames3]

Good to know, thank you again for clearing this up. One last thing though, variables they that are changed within a screen, but are not defined in said screen are not saved once the game is saved and loaded. I'm guessing this is because screens themselves are functions and it would need to return() the value in order to update it.

[Alex]

You can change global variables (defined outside the screen) inside the screen using SetVariable action, and they should be saved properly.

Check this article about saving issues - https://www.renpy.org/doc/html/save_load_rollback.html
(https://www.renpy.org/doc/html/save_loa ... after-load)

[haydengames3]

This has created an interesting side effect. I changed my variable from 'init python' to 'define' and ran the code below inside a screen.

textbutton "Increase HP":
action SetVariable("hp",hp + 1)

Now it only increases the first time it's clicked (Greyed out otherwise) and if the number has already increased outside of the screen and it is clicked again, it will reset the number back to + 1 of the original value, any ideas why this is happening?

[Ocelot]

When the screen is shown (and any time it is evaluated, for prediction or any other reason), it parses screen, evaluating screen elements and their properties. When action is evaluated, it creates a SetVariable object and writes down two values: name of the variable and value to be set. Those values are calculated and recorded at the moment of screen parsing, so hp + 1 is replaced with an actual number. Now, any changes to the hp value are irrelevant, unless screen is parsed again.

[haydengames3]

Thank you all for your responses, I shall try to work it out from here.