SOLVED - Cycling through backgrounds on a screen with button

[Deji]

I want to implement a little tips/tutorial thingie with Previous, Next and Exit buttons, so when you start it starts on the first screen/tips image and when you click Next it goes to the next one, and if you click previous it goes to the previous one, right?

So my logic tells me something like this should work:

Code: Select all

screen tutorial:
    default cur_screen_num = 1
    python:
        cur_screen = "assets/ui/tut/tips_%s.jpg"%(cur_screen_num)
    add cur_screen
    imagebutton:
        auto "assets/ui/tut/tips_prev_%s.png"
        action SetScreenVariable(cur_screen_num, cur_screen_num-=1)
        hovered Play("sound", "assets/sfx/menu_hover3.ogg")
        xpos 80
        ypos 680
    imagebutton:
        auto "assets/ui/tut/tips_next_%s.png"
        action SetScreenVariable(cur_screen_num, cur_screen_num+=1)
        hovered Play("sound", "assets/sfx/menu_hover3.ogg")
        xpos 1040
        ypos 680
    imagebutton: 
        auto "assets/ui/tut/tips_exit_%s.png"
        action Return()
        hovered Play("sound", "assets/sfx/menu_hover3.ogg")
        xpos 1140
        ypos 15

The I call the screen with call.
Buuuut the SetScreenVariable hates me. It doesn't even work if I change the second value to 1 or "1" for testing, it still gives me an error.
I honestly don't know how to do this and it doesn't seem like a straightforward solution for a beginner like me... help? :')

[chocojax]

I believe it should be:

Code: Select all

action SetScreenVariable("cur_screen_num", curr_screen_num+1)
  # BTW, it's curr_screen_num+1 when you're handing in a value, the +=1 only works when doing assignment like:
  # curr_screen_num = 1
  # curr_screen_num += 1 

[Deji]

OMG YES IT WORKS NOW!
Thank you, chocojax!

(Basically I didn't know I had to put the var name in "" ^^;;; )