A Sample Xlib Program

• The sample http://siber.cankaya.edu.tr/SystemsProgramming/cfiles/bifurcation.c program provides a simple example of creating a window, handling events, and performing simple graphics operations using the Xlib API.
• This simple program uses the function draw_bifurcation to draw the window contents. The function prototype (or signature) is as follows:

  void draw_bifurcation(Window window, GC gc, Display *display,
                        int screen, XColor text_color)
  

• The function main defines the following data:

  Display *display; For referring to X server's display
  int screen; Identifies which screen on the X server you're using
  Window win; Identifies the application's window
  XColor blue; You want to display text using the color blue
  unsigned int width=500; Specifies the initial window width
  unsigned int height=231; Specifies the initial window height
  XFontStruct *font_info; For using a display font
  GC gc; Identifies the windows GC
  Colormap cmap; Used to query the X server for the color blue
  XEvent x_event; Used to fetch X events
  XGCValues values; Used for the GC attributes returned by the X server