Re: [Visualpython-users] Marrying Vpython and GUI Toolkit

You can run Visual Python "alongside" any toolkit, I believe.  You can do this 
with most toolkits, actually, it's just a tricky juggling act, and usually not 
worth it.  All you need to do is run one event loop at a time, and swap 
between (among?!) them.  I've done this with wx and Tkinter in the past.

I use GTK and VPython together.  GTK has a quirk, though.  On Windows, you 
need to tell GTK about it if you're using multithreading.  Yeah, the naive 
approach runs fine (for the limited tests I've done, there's probably a way to 
break it) on Linux.  Point is, VPython runs in a background thread under the 
hood, so you need this element if you're on Windows.  Here's some demo code:

----------------------------------------------------------
import pygtk
pygtk.require('2.0')

import gtk

from visual import display, frame, convex, color

class GtkApp(gtk.Window):

    def buildVisual(self):
        scene0 = display(title='Visual Python')

        f = frame()
        half1 = convex(frame=f, pos=[
            [-0.5,-0.5,-0.5], [0.5,0.5,0.5],[0.0,-0.5,0.5], [0.0,0.5,-0.5],
            [0.5,-0.5,0.5], [0.5,-0.5,-0.5], [0.5,0.5,-0.5] ],
            color=color.cyan)

        half0 = convex(frame=f, pos=[
            [-0.5,-0.5,-0.5], [0.5,0.5,0.5], [0.0,-0.5,0.5], [0.0,0.5,-0.5],
            [-0.5,0.5,-0.5],[-0.5,0.5,0.5],[-0.5,-0.5,0.5] ],
            color=(0.0,.5,1.0))

    def onPress(self, w):
        print 'close the Visual Python window to exit'

    def buildGUI(self):

        box = gtk.VBox(False, 0)

        btn = gtk.Button('press me')
        btn.connect('clicked', self.onPress)
        btn.set_border_width(5)

        box.pack_start(btn, False, False, 0)
        btn.show()

        self.add(box)
        box.show()

    def __init__(self):
        gtk.Window.__init__(self)
        self.set_title('GIMP Toolkit')

        self.buildGUI()
        self.buildVisual()

if __name__ == '__main__':
    gtk.gdk.threads_init()
    myapp = GtkApp()
    myapp.show()
    gtk.gdk.threads_enter()
    gtk.main()
    gtk.gdk.threads_leave()
----------------------------------------------------------

Here's the relevant bit in the pygtk faq:
http://faq.pygtk.org/index.py?req=show&file=faq20.006.htp

I believe VPython will run your callbacks/handlers in the main thread, but 
check this before you try to call pygtk from the wrong thread.. ack!

Cheers!


On Tuesday 20 July 2010, Stefano Mtangoo wrote:
> Hello friends,
> I have been for long out of Vpython for long now, but I have plans to
> develop Scientific simulation
> Program for Physics students. As we know, Visual Did not support
> integration with wxPython or any toolkit.
> Is that possible now? If no what are plans to implement that feature?
> Thanks
> 
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