#include <X11/Xlib.h>
#include <stdio.h>
#include <stdlib.h>
Window
create_simple_window(Display* display, int width, int height, int x, int y)
{
int screen_num = DefaultScreen(display);
int win_border_width = 2;
Window win;
win = XCreateSimpleWindow(display, RootWindow(display, screen_num),
x, y, width, height, win_border_width,
BlackPixel(display, screen_num),
WhitePixel(display, screen_num));
XMapWindow(display, win);
XFlush(display);
return win;
}
GC
create_gc(Display* display, Window win, int reverse_video)
{
GC gc;
unsigned long valuemask = 0;
XGCValues values; /* initial values for the GC. */
gc = XCreateGC(display, win, valuemask, &values);
if (gc < 0) {
fprintf(stderr, "XCreateGC: \n");
}
return gc;
}
void
main(int argc, char* argv[])
{
Display* display;
int screen_num;
Window win;
unsigned int display_width,
display_height;
unsigned int width, height;
char *display_name = getenv("DISPLAY");
GC gc;
Colormap screen_colormap;
XColor blue;
Status rc;
display = XOpenDisplay(display_name);
screen_num = DefaultScreen(display);
display_width = DisplayWidth(display, screen_num);
display_height = DisplayHeight(display, screen_num);
width = (display_width / 3);
height = (display_height / 3);
win = create_simple_window(display, width, height, 0, 0);
gc = create_gc(display, win, 0);
XSync(display, False);
screen_colormap = DefaultColormap(display, DefaultScreen(display));
rc = XAllocNamedColor(display, screen_colormap, "blue", &blue, &blue);
XSetForeground(display, gc, blue.pixel);
XDrawArc(display, win, gc, 100-(30/2), 50-(50/2), 30, 30, 0, 360*64);
XFlush(display);
sleep(10);
XCloseDisplay(display);
}
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