xlib_playground

Xlib playground for experiments.
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ex1.c (2286B)

      1 #include <stdio.h>
      2 #include <stdlib.h>
      3 #include <time.h>
      4 #include <unistd.h>
      5 #include <math.h>
      6 
      7 #include <X11/Xlib.h>
      8 
      9 /* macros */
     10 #define INIT_WIDTH 800
     11 #define INIT_HEIGHT 600
     12 
     13 
     14 /* variables */
     15 Display     *display;
     16 Window       window;
     17 unsigned int win_width = INIT_WIDTH, win_height = INIT_HEIGHT;
     18 GC           gc;
     19 Atom         wm_delete_window;
     20 
     21 /* function prototypes */
     22 void setup(void);
     23 void cleanup(void);
     24 
     25 
     26 void
     27 setup(void)
     28 {
     29 	if ((display = XOpenDisplay(NULL)) == NULL){
     30 	    fprintf(stderr, "ERROR: could not open display\n");
     31 	    exit(1);
     32 	}
     33 	window = XCreateSimpleWindow(
     34 	                    display,
     35 	                    XDefaultRootWindow(display),
     36 	                    0, 0,
     37 	                    win_width, win_height,
     38 	                    0, 0,
     39 						0);
     40 	XStoreName(display, window, "UNKO");
     41 	gc = XCreateGC(display, window, 0, NULL);
     42 
     43 	wm_delete_window = XInternAtom(display, 
     44 	                               "WM_DELETE_WINDOW", False);
     45 	XSetWMProtocols(display, window, &wm_delete_window, 1);
     46 
     47 	XSelectInput(display, window,
     48 	             ExposureMask|KeyPressMask|KeyReleaseMask);
     49 	
     50 	XSetForeground(display, gc, 0x0000FF);
     51 	XMapWindow(display, window);
     52 }
     53 
     54 void
     55 cleanup(void)
     56 {
     57 	XCloseDisplay(display);
     58 }
     59 
     60 int
     61 main(void)
     62 {
     63 	int px, py;
     64 	int quit;
     65 	struct timespec ts;
     66 	XEvent event;
     67 
     68 	setup();
     69 	quit = 0;
     70 
     71 	while (!quit){
     72 		while(XPending(display) > 0){
     73 			XNextEvent(display, &event);
     74 			switch (event.type){
     75 			case KeyPress: {
     76 				switch (XLookupKeysym(&event.xkey, 0)){
     77 				case 'q':
     78 					quit = 1;
     79 					break;
     80 				default:
     81 					break;
     82 				}
     83 			} break;
     84 			case ClientMessage: {
     85 				if ((Atom) event.xclient.data.l[0] == wm_delete_window) {
     86 					quit = 1;
     87 				}
     88 			} break;
     89 			default:
     90 				break;
     91 			}
     92 		}
     93 		clock_gettime(CLOCK_MONOTONIC, &ts);
     94 		px = 200 + (int) (100 * sinf(ts.tv_sec + ts.tv_nsec / 1000.0 / 1000 / 1000));
     95 		py = 200 + (int) (100 * cosf(ts.tv_sec + ts.tv_nsec / 1000.0 / 1000 / 1000));
     96 		XClearArea(display, window,
     97 				   0, 0,                  // position
     98 				   win_width, win_height, // width and height
     99 				   False);
    100 		XFillRectangle(display, window, gc,
    101 					   px, py,    // position
    102 					   100, 100);   // width and height
    103 		
    104 		ts.tv_sec = 0;
    105 		ts.tv_nsec = 10 * 1000 * 1000;
    106 		nanosleep(&ts, NULL);
    107 	}
    108 
    109 	cleanup();
    110 	return 0;
    111 }