KOUACH Mustapha wrote:
>
> Hi,
> How can I put a pixel using Gtk and C under Linux.
> Thanks every body.
Since Gtk is a widget toolkit, you don't just plot a pixel in a window;
you need to create an area into which you can draw. This is called,
strangely enough, a GtkDrawingArea. Once you have a drawing area, you
can use the GDK drawing primitives on this area. These primitives
include gdk_draw_line, gdk_draw_arc, and the function you need,
gdk_draw_point.
The following is a cheap and nasty example;
---------------
#include <gtk/gtk.h>
int main(int argc, char *argv[])
{
GtkWidget *darea;
GtkWidget *window;
gtk_init(&argc,&argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
darea = gtk_drawing_area_new();
gtk_container_add (GTK_CONTAINER (window), darea);
gtk_widget_show(darea);
gtk_widget_show(window);
gdk_draw_point(darea->window,darea->style->black_gc,10,20);
gtk_main();
return 0;
}
-----------
This will create a window, add a drawing area to it, and draw a black
pixel at coordinates x=10, y=20 within this area. Be warned; this is a
trivial example - the black pixel will not be remembered if you obscure
the parent window.
The easiest way to do this is to create a backing pixmap, draw to that,
and use expose events to render the backing pixmap to the drawing_area.
Check the API pages on gtk_drawing_area to find out how to do this. They
can be found at:
http://developer.gnome.org/doc/API/gtk/gtkdrawingarea.html
Enjoy,
Russ Magee
--
-----------------------------------------------------------
Russell Keith-Magee
PhD Research Student
School of Computing, Curtin University of Technology
email: [EMAIL PROTECTED] OR [EMAIL PROTECTED]
WWW: http://www.cs.curtin.edu.au/~keithmag
Ph: +61 8 9266 2129 FAX +61 8 9266 2819
-----------------------------------------------------------
The future lies ahead.
_______________________________________________
gtk-list mailing list
[EMAIL PROTECTED]
http://mail.gnome.org/mailman/listinfo/gtk-list
