Possible to define a transform with "old_widget = None"?

[Treladon]

Hi guys,

I'd like to define a transform where "old_widget = None," but I'm having a hard time. Am I doing things all wrong??

My goal is to have a band wiperight near the top corner of my screen with the name of the song that I have playing. Then, after a moment, it will wipeleft and disappear.

This is what I currently have:

Code: Select all

    transform music_intro(new_widget, old_widget = None): 
        parallel:
            "notify.png" #the band image file
            alpha 0.0 xalign 0 yalign 0 crop (0,0,0,35)
            linear 1.0 alpha 1.0 crop (0,0,767,35) #wiperight (the size of notify.png is 767 x 35)
            3.0 #wait a moment
            linear 1.0 alpha 0.0 crop (0,0,0,35) #wipe left
        parallel:
            contains:
                new_widget #the name of the song as a text expression
                alpha 0.0 xalign 0 yalign 0 crop (0,0,0,35) size(767,35) 
                linear 1.0 alpha 1.0 crop (0,0,767,35) #wiperight
                3.0 #wait a moment
                linear 1.0 alpha 0.0 crop (0,0,0,35)

#wipeleft
And this is how I'm trying to execute it:

Code: Select all

    play music "Denial.ogg"
    show expression Text("Denial") as new_widg with music_intro

Ren'Py won't tolerate having old_widget undefined and inserting "$ old_widget = None" before "play music" doesn't make a difference . I added "as new_widg" as an experiment. It doesn't work whether it's there or not.

The malfunction I'm getting is that the background jumps from what it's supposed to be to a transparent screen briefly, then it shows "Denial" at the bottom of the screen (default size) and it doesn't disappear.

Does anyone know the answer to this puzzle?

Thanks