screen troubles

[Omni]

I have been having difficulty using the screen function in Ren'Py, the background element in particular.

I'm trying to have a screen with buttons on it, but I don't want to use an image map as I want the buttons to only appear if the right conditions are met.

I have a couple if images defined at the start, but not in an init block and before the start label

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image bg yourRoom = "bedroom.jpg"
image bg yourComp = "computer.jpg"

In a different file, I have this screen defined.

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screen yourRoom():
    window:
        pos(0,0)
        anchor ('top','left')
        xysize(1024,768)
        xpadding 0
        ypadding 0
        background None
        # background Frame("bedroom.jpg")
        vbox:
            button:
                pos(600,350)
                text "computer"
                background None
                #action useYourComputer

and in a different file again if this set up.

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label useYourComputer:
    scene bg yourComp
    you "This is my computer"

in the original script file, after the start label, I have this:

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you "Ah! A brand new day. I wonder what crazy shenanigans I'll get up to this time."
    
    show screen yourRoom
    
    you "This is my room"

As it is right now, the screen yourRoom just makes the word "computer" appear in the middle of the screen.

If I uncomment the buttons action, I get the error: name 'useYourComputer' is not defined

It's not a problem with the labels visibility as it works fine if I jump to it from the script file.
It's not an execution order problem either as if I put the screens in an init block, it still happens.


Also, how do use the background element for anything other than making it invisible?
if I use: background Frame("bedroom.jpg")
in the screen yourRoom
I get the error:
error in script
you "This is my room"
TypeError: unsupported opperand type(s) for +: 'NoneType' and 'NoneType'

[trooper6]

There are things I don't really understand about what you are trying to do...so I will help as far as I can...then I will ask question.

Here is your screen:

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screen yourRoom():
    window:
        pos(0,0)
        anchor ('top','left')
        xysize(1024,768)
        xpadding 0
        ypadding 0
        background "images/apartment.jpg"
        vbox:
            textbutton "computer":
                pos(600,350)
                #background None #We need to talk about this
                action NullAction() #We need to talk about this

This will give your screen the background of an image.
I turned your button into a text button, it just seemed easier.
Question 1) Why did you give your button a background of none? Your player may not realize that the text is a button without a background
Comment on your action. You had action useYourComputer in your code. But useYourComputer is not an action. All actions available to you are on this page:
http://www.renpy.org/doc/html/screen_actions.html

If you want to jump to the label useYourComputer...you would
action Jump("useYourComputer")

But this code is not going to do what you want it to in the end:

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screen yourRoom():
    window:
        pos(0,0)
        anchor ('top','left')
        xysize(1024,768)
        xpadding 0
        ypadding 0
        background "images/apartment.jpg"
        vbox:
            textbutton "computer":
                pos(600,350)
                #background None
                action Jump("useYourComputer")

label start:
    "You" "Ah! A brand new day. I wonder what crazy shenanigans I'll get up to this time."
    show screen yourRoom()
    "You" "This is my room."

    return
    
label useYourComputer:
    scene bg underpassd
    "You" "This is my computer"
    return

Why is this not going to work? Because when you press your button and jump to that label, you won't see the background because it'll be behind the yourRoom() screen.

So you could call the screen yourRoom() which will make it disappear after you make a choice.

[Omni]

Thank you for the assistance.

The reason why I gave the button a background of none was because I was trying to keep it simple as I trial and errored may way to figuring out how it all worked. Ultimately I plan on having an image for the button with some text on top of it. Would I be able to have an image on a text button?

With the action I tried: action jump useYourComputer
I see that I was on the right track, but I just didn't know the right syntax.

With the background element, is there a way to use an image variable for that instead of directly referring to a specific image?
I could probably get by with directly referring to images, but I would like to know for potential future reference.