From 3913d1778318cd0c6bfb871148d38abb33ec7fd3 Mon Sep 17 00:00:00 2001
From: nasr <nsrddyn@gmail.com>
Date: Wed, 28 Jan 2026 13:13:40 +0100
Subject: checkpoint

---
 xlib-tutorial/prog-2.cc | 74 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 xlib-tutorial/prog-2.cc

(limited to 'xlib-tutorial/prog-2.cc')

diff --git a/xlib-tutorial/prog-2.cc b/xlib-tutorial/prog-2.cc
new file mode 100644
index 0000000..51ea0e9
--- /dev/null
+++ b/xlib-tutorial/prog-2.cc
@@ -0,0 +1,74 @@
+// Written by Ch. Tronche (http://tronche.lri.fr:8000/)
+// Copyright by the author. This is unmaintained, no-warranty free software. 
+// Please use freely. It is appreciated (but by no means mandatory) to
+// acknowledge the author's contribution. Thank you.
+// Started on Thu Jun 26 23:29:03 1997
+
+//
+// Xlib tutorial: 2nd program
+// Make a window appear on the screen and draw a line inside.
+// If you don't understand this program, go to
+// http://tronche.lri.fr:8000/gui/x/xlib-tutorial/2nd-program-anatomy.html
+//
+
+#include <X11/Xlib.h> // Every Xlib program must include this
+#include <assert.h>   // I include this to test return values the lazy way
+#include <unistd.h>   // So we got the profile for 10 seconds
+
+#define NIL (0)       // A name for the void pointer
+
+main()
+{
+      // Open the display
+
+      Display *dpy = XOpenDisplay(NIL);
+      assert(dpy);
+
+      // Get some colors
+
+      int blackColor = BlackPixel(dpy, DefaultScreen(dpy));
+      int whiteColor = WhitePixel(dpy, DefaultScreen(dpy));
+
+      // Create the window
+
+      Window w = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0, 
+				     200, 100, 0, blackColor, blackColor);
+
+      // We want to get MapNotify events
+
+      XSelectInput(dpy, w, StructureNotifyMask);
+
+      // "Map" the window (that is, make it appear on the screen)
+
+      XMapWindow(dpy, w);
+
+      // Create a "Graphics Context"
+
+      GC gc = XCreateGC(dpy, w, 0, NIL);
+
+      // Tell the GC we draw using the white color
+
+      XSetForeground(dpy, gc, whiteColor);
+
+      // Wait for the MapNotify event
+
+      for(;;) {
+	    XEvent e;
+	    XNextEvent(dpy, &e);
+	    if (e.type == MapNotify)
+		  break;
+      }
+
+      // Draw the line
+      
+      XDrawLine(dpy, w, gc, 10, 60, 180, 20);
+
+      // Send the "DrawLine" request to the server
+
+      XFlush(dpy);
+
+      // Wait for 10 seconds
+
+      sleep(10);
+}
+
-- 
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