Couple of gnomecanvas questions

[Tuomas Peippo <tuomas peippo 2ndpoint fi>]

I'm coding a simple whiteboard software with gtk and for now I have  
done drawing using Gdk::Pixmap and GtkDrawingArea. But now I need also  
alpha supportand antialiasing wouldn't hurt either =). I didn't want to  
do this by my own so I found libart and gnomecanvas which seemed  
perfect.

After reading gnomecanvas API docs I got the idea that it's purely  
meant for vector graphics? Is there any way to just draw those lines,  
points etc. with gnomecanvas and after that threat them as "pure  
pixels" ?

Vectors isn't the main problem but I would need some sort of method to  
draw and erase them freely like in GIMP not just deleting whole item.

Tuomas Peippo