Accessing ShowBase from other classes

Scripting Issues
1 
from direct.showbase.ShowBase import ShowBase
from direct.gui.DirectGui import *

class Core(ShowBase):
    def __init__(self):
        ShowBase.__init__(self)
        ButtonBar()


class ButtonBar():
    def __init__(self):
        self.btnsr = DirectButton(parent=pixel2d) # how do I access ShowBase from this class?


core = Core()
core.run()

With the current code I cant parent btnsr to pixel2d as ButtonBar has no access to ShowBase. How do I access ShowBase while keeping the code separated into two classes

2

What you have there should work, and indeed, on my machine it does.

However, there is one problem: you haven’t set a scale on your button, and as pixel2d uses a scale of 1 Panda-unit per pixel (I think it is), your button at its default size is too small to easily see. If you give it a larger scale (say, “300”), you should see it peek in at the top-left of the window (the origin of pixel2d).

(Unless you’re seeing some error that I’m not getting, of course, in which case: what are you seeing on your end?)

More generally, if I’m not much mistaken, ShowBase establishes a global variable named “base” that, along with several other globally-accessible things (including “render” and “pixel2d”), should be accessible from pretty much anywhere.

You can thus do things like this:

from direct.showbase.ShowBase import ShowBase
from direct.gui.DirectGui import *

class Core(ShowBase):
    def __init__(self):
        ShowBase.__init__(self)
        self.cat = "Kitty"

class SomeOtherClass():
    def __init__(self):
        print (base.cat)
        print (base.win.getSize())

core = Core()
mew = SomeOtherClass()
core.run()

Which should print “Kitty”, followed by “LVecBase2i(<x>, <y>)”, where <x> and <y> are the width and height of the window–in my case, they’re 800 and 600, repsectively.

(The call to “run” is superfluous to running the print-statements in the example above.)

3

using base seems to work just fine :smiley: thank you! Quick question since you know panda3d better than me, how do it make it so that the button pos changes automatically when the window size changes? I tried setting pos relative to win.getSize() but that doesnt seem to update. edit: i’d also like the scale to update

4

It seems that using aspect2d’s a2dTopLeft etc… updates the buttons pos

5

I’m glad that you seem to have found those NodePaths, and the earlier help is my pleasure. :slight_smile: