-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Scott Robert Ladd <gnome@xxxxxxxxxxxxxxx> writes: > Roger Leigh wrote: >> Have you taken a look at libgnomecanvas? Despite the name, it only >> depends on GTK+, and it allows anti-aliased line drawings of arbitrary >> size. >> >> I don't know, but I suspect it will be replaced by, or depend upon, >> Cairo at some point, but it's mature and usable right now. > > My only problem is in finding a reasonable tutorial for GnomeCanvas. If > you know of one, I'd appreciate a pointer to it. > > I'm just drawing lins on top of an existing pixbuf; nothing terribly > complex. I think I'm doing everything right, but the line doesn't show > up. A quick tutorial will probably show me the obvious. I don't have a tutorial I'm afraid, but you're welcome to look at my code (and use it--it's GPL :-). http://arch.debian.org/cgi-bin/archzoom.cgi/rleigh@xxxxxxxxxxxxxxxxxxxxxx/uterm--mainline--0.1--patch-41/cse?color=default The cse-canvas-*.[ch] files will be the ones of interest. The base GnomeCanvas objects are found in cse-canvas.[ch]. cse_canvas_realize() and cse_canvas_init() are where the interesting canvas-y stuff happens. The other files are derived GnomeCanvasItems. You don't need to derive GnomeCanvasItems at all--using the stock items is fine, but I've used it to simplify canvas operations by deriving from GnomeCanvasGroup, so a single object can contain a set of related items which may be manipulated as a whole. Sorry about the lack of documentation there--I've not yet documented the canvas stuff. You can check out the whole source tree using the instructions here: http://arch.debian.org/cgi-bin/archzoom.cgi/rleigh@xxxxxxxxxxxxxxxxxxxxxx/uterm--mainline--0.1--patch-41/README?color=default If you don't have arch or the build dependencies, I can put up a tarball. Seeing how the canvas stuff looks on screen will hopefully illustrate better what the code is doing. (You'll need to configure with CC='gcc -std=gnu99' until autoconf includes AC_PROG_CC_C99.) I found the Gnumeric sources, and the advice of Jody Goldberg (the maintainer) to be invaluable while writing this. Regards, Roger - -- Roger Leigh Printing on GNU/Linux? http://gimp-print.sourceforge.net/ Debian GNU/Linux http://www.debian.org/ GPG Public Key: 0x25BFB848. Please sign and encrypt your mail. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) Comment: Processed by Mailcrypt 3.5.8 <http://mailcrypt.sourceforge.net/> iD8DBQFCiQISVcFcaSW/uEgRAo5zAKCmRjcRbcRMhe0ffV69G7loZOqRGgCfTOHP KfEcyMXCQtdKMn54oVkD4mI= =1SaL -----END PGP SIGNATURE----- _______________________________________________ gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
