OpenEuphoria

Re: GTK image in drawing_area

• Posted by irv mullins <irvm at ellijay.com> Aug 08, 2005
• 599 views

Michael J. Sabal wrote:
> 
> Before I start hacking the EuGTK library, I'm having a little difficulty with
> the draw_image routine.  I want to use an area of the screen where I can 
> display drawing primitives (lines mostly), jpeg or png images, or text.  Based
> on what I've read of the GTK documentation, drawing_area seems to be the 
> widget best suited to the task.  The primitives are no problem, and I'll
> tackle
> the text issue a little later (requires building the pango includes that are
> presently empty).  When I do this:
> 
> canvas = drawingarea()
> show(win)
> drawable = gtkGet(canvas,"Drawable")
> gc = new_gc()
> img = image("myfile.jpg")
> draw_image(drawable,gc,img,0,0,0,0,320,200)
> 
> GTK throws back a fatal exception that img is not a GTK_IMAGE via some 
> internal X11 call.  Assume that myfile.jpg is in fact a valid image file
> in the same directory as the program.
> 
> Any suggestions, or should I start hacking?

Hi Mike:

First thing would be to ? img - it should be some large number, a pointer 
to the image. If it's 0, then there's an error reading the jpg.

I've never tried adding an image to a canvas, but the GTK image is a widget,
IOW, a container for a .jpg, .xpm, .gif, etc. which automagically handles 
displaying the file contents. You probably want to create a GDK image instead, 
onto which you can draw lines or pixmap data. See GDK RGB in the docs.
GDK RGB isn't wrapped, but adding it should be straightforward.

Irv