I have just started using the gnome-python system and am having trouble
displaying an image on the Gnome Canvas.
I'm using gnome-python-1.0.3
This is what I'm doing. Am I doing something wrong?
import gtk
import GdkImlib
import gnome.ui
import MLab # some numeric functions
arr = MLab.eye(50) # an identity matrix
# Make the identity matrix into an RGB image with a diagonal of
# RGB=255,255,255
arr = (arr[...,MLab.NewAxis]*MLab.ones((1,1,3))*255).astype('b')
# create the image from a string of data
im = GdkImlib.create_image_from_data(arr.tostring(),None,50,50)
# Construct a window
win = gtk.GtkWindow()
win.connect('destroy',gtk.mainquit)
win.show()
# Construct a canvas
canvas = gnome.ui.GnomeCanvas()
canvas.set_usize(200,200)
# Add canvas to the window
win.add(canvas)
canvas.show()
# Add an ellipse to the window (this works)
el=canvas.root().add('ellipse',x1=30,x2=60,y1=40,y2=100,fill_color='blue')
# Add an image to the window (this doesn't)
theim = canvas.root().add('image',x=10,y=20,image=im._im)
gtk.mainloop()
The result of this script:
GnomeUI-ERROR **: file gnome-canvas-image.c: line 461 (recalc_if_needed):
assertion failed: (image->pixmap != NULL)
aborting...
Aborted (core dumped)
In the source-code this assertion takes place right after the command
image->pixmap = gdk_imlib_move_image (image->im);
which I suppose renders the RGB image in a pixmap for display. Apparently
this call is not working. But it seems like I'm passing the right type
(im._im is a PyGdkImageObject in Python).
Any help is appreciated..
Thanks,
Travis Oliphant
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