[cairo] graphics problem

[Roman Goldov]

Hello, thank you for the answer. many apologies for not providing full information about a C-example file and a version of gtk+-devel and cairo-devel in the previous e-mail. below i send you a version of gtk+-devel and cairo-devel - as a i understand the version of gtk+ is "1.2" and of cairo-devel is "1.12" (in my OS - CentOS 7):

[root at localhost ...]# yum install cairo-devel
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: centos-mirror.rbc.ru
 * epel: epel.besthosting.ua
 * extras: centos-mirror.rbc.ru
 * updates: centos-mirror.rbc.ru
Package cairo-devel-1.12.14-6.el7.x86_64 already installed and latest version
Nothing to do

[root at localhost ...]# yum install gtk+-*
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: centos-mirror.rbc.ru
 * epel: epel.besthosting.ua
 * extras: centos-mirror.rbc.ru
 * updates: centos-mirror.rbc.ru
Package 1:gtk+-devel-1.2.10-77.el7.x86_64 already installed and latest version
Package 1:gtk+-1.2.10-77.el7.x86_64 already installed and latest version
Nothing to do

i would appreciate if someone could send me a few examples (of full working C-files) of how one could incorporate 
cairo into gtk+-1.2. - at the moment i looked through examples at the web-site "http://cairographics.org/examples/",
howevere i could not understand how one could use cairo functions to draw/insert lines, color rectangles and other color (or b/w) pictures in a window created by gtk+.

Thank you.
Roman Goldov




13.10.2015, 19:55, "Stefan Salewski" <mail at ssalewski.de>:
> On Tue, 2015-10-13 at 15:54 +0300, Roman Goldov wrote:
>>  Hello, i installed CentOS 7 and gtk-devel libaries. I learn GTK+ and
>>  Cairo. I downloaded (copied) from Internet an exmple of cairo file
>>  (file9.c that is attached) where i tried to draw lines (graphics) on
>>  the window. However, the window is opened and it is empty, and also
>>  theer is warning message in the terminal:
>>
>>  [... at localhost ~]$ gcc -Wall -g file9.c -o file9.exe `pkg-config -
>>  -cflags gtk+-2.0` `pkg-config --libs gtk+-2.0`
>>  [... at localhost ~]$ ./file9.exe
>>
>>  (file9.exe:9678): GLib-GObject-WARNING **: gsignal.c:2462: signal
>>  'draw' is invalid for instance '0x968440' of type 'GtkDrawingArea'
>>
>>  I would appreciate help in solving the problem. A detailed answer
>>  would be appreciated because i am a new user of Linux.
>>  Thank you.
>>  Roman Goldov
>>  --
>
> You took that example from zcode.com -- so why do you not tell us?
> That example is for GTK3 now. It will not work in its current state with
> GTK2. You may asks the author if he still has the very old GTK2 version.
> Or you may use other examples which have not been ported to GTK3 jet, I
> guess there will exists some in internet. Or, you you may port that
> example back to GTK2, I think there is not very much to modify, but I do
> not know exactly what, because I am using GTK3 for years now.
>
> Is there no GTK3 available for your OS, or have you a good reason for
> using old GTK2?
>
> If you really need a GTK2 example and can not find one, let us know, I
> may provide one in the next few days...