Re: [pygtk] Newbie: Capturing from a camera, displaying on a drawingArea.
> "Alexandre" == Alexandre Strube <[EMAIL PROTECTED]> writes:
Alexandre> The file "foo.png" is saved correctly, which means the
Alexandre> capture stuff is ok. However, nothing shows up on
Alexandre> "janela1". What am I doing wrong?
Alexandre> Thanks for your help,
As Gustavo pointed out, you cannot draw until the window is realized.
Here is some template code for drawing
#!/usr/bin/env python
# this is meant to be used as a template file to practice drawing commands
import pygtk
pygtk.require('2.0')
import gtk
from gtk import gdk
def draw(widget):
print 'draw'
gc = widget.window.new_gc()
widget.window.draw_rectangle( gc, 1, 100,100,100,100)
def configure_event(widget, event):
print 'config'
draw(widget)
return gtk.TRUE
def expose_event(widget, event):
print 'expose'
draw(widget)
return gtk.TRUE
def realize(widget):
print 'realize'
draw(widget)
return gtk.TRUE
win = gtk.Window()
win.set_size_request(640, 480)
win.show()
vbox = gtk.VBox()
vbox.show()
win.add(vbox)
da = gtk.DrawingArea()
da.connect('configure_event', configure_event)
da.connect('expose_event', configure_event)
da.connect('realize', realize)
da.show()
vbox.pack_start(da, gtk.TRUE, gtk.TRUE)
button = gtk.Button('Quit')
button.show()
vbox.pack_start(button, gtk.FALSE, gtk.FALSE)
button.connect('clicked', gtk.mainquit)
gtk.mainloop()
You will probably want to connect your function which grabs a frame
and displays it when called to the gtk idle handler or timer,
Also, do you need to go through PIL? Can you not do something like.
widget.window.draw_rgb_image(gc, 1, 1, WIDTH, HEIGHT,
gtk.gdk.RGB_DITHER_NONE, vid.getImage(0), stride)
JDH
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[pygtk] gnome-python and suse 9.0
Has anyone ran gnome-python on suse 9.0? One user of Solfege is trying to install solfege on a fresh suse 9.0 box, and he get this error message: Traceback (most recent call last): File "/usr/local/bin/solfege", line 46, in ? import src.mainwin File "/usr/local/share/solfege/2.1.0/src/mainwin.py", line 149, in ? import gnome, gnome.ui ImportError: could not import bonobo.ui Does anybody know what package contains the bonobo.ui module on suse 9? On debian this it is in python2.3-gnome2. -- Tom Cato Amundsen <[EMAIL PROTECTED]> GNU Solfege - free eartraining, http://www.gnu.org/software/solfege/ ___ pygtk mailing list [EMAIL PROTECTED] http://www.daa.com.au/mailman/listinfo/pygtk Read the PyGTK FAQ: http://www.async.com.br/faq/pygtk/
Re: [pygtk] Newbie: Capturing from a camera, displaying on a drawingArea.
A Qui, 2004-02-26 às 01:48, Alexandre Strube escreveu:
> Hello list,
>
> I'm trying to write a kind of webcam application in Python, using as
> user interface a .glade file. Until there, nothing difficult.
>
> My problem is with getting the data from the webcam and putting it to
> screen. I can grab images from camera and save it to files, but I don't
> know how to put it on a gtk widget.
>
> I have a drawingArea widget, called "janela1". I'm receiving data from
> video4linux to the variable "im", and converting this to a string again
> for putting it on the window, as stated at
> " http://www.daa.com.au/pipermail/pygtk/2004-January/006731.html "
>
> The code follows:
>
> janela1=xml.get_widget('drawingarea1') # gets drawingarea widget
> gc=janela1.window.new_gc() # creates a new window context
> vid=inicializavideo() # initializes video4linux stuff
> im=Image.fromstring("RGB",(WIDTH,HEIGHT),vid.getImage(0)) # grab image
> im.save("foo.png","PNG") # Saves image file (it works)
> buff=im.tostring()
> janela1.window.draw_rgb_image(gc, 1, 1, WIDTH, HEIGHT,
> gtk.gdk.RGB_DITHER_NONE, buff)
> gtk.main()
>
>
> The file "foo.png" is saved correctly, which means the capture stuff is
> ok. However, nothing shows up on "janela1". What am I doing wrong?
You are not understanding correctly the philosophy of GTK (or X)
programming. In GTK, you never draw directly to a widget. Instead, you
tell the X server the widget needs to be redrawn, then the X server
calls you back telling you to draw an area of your widget.
To summarise, you should:
1. connect a handler to 'expose-event' signal. The handler has the
following signature:
def expose_event_cb(widget, event):
event is a structure containing the fields: x, y, width, height.
These fields define the area that actually needs to be painted, which
might be different from the entire widget area if, for example, there is
a window on top of the widget, partially obscuring it.
2. call widget.queue_draw() whenever you want to repaint your widget.
You might want to read a GTK tutorial, to better understand these
issues.
Regards.
--
Gustavo João Alves Marques Carneiro
<[EMAIL PROTECTED]> <[EMAIL PROTECTED]>
The universe is always one step beyond logic.
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