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// 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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