--- /dev/null
+/*
+ * Pong Clock - A clock that plays pong.
+ * See http://mocoloco.com/archives/001766.php for the inspiration.
+ *
+ * Copyright (C) 2005 Matthew Allum
+ *
+ * Author: Matthew Allum mallum@openedhand.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xatom.h>
+
+/* Tweak values for different hw setups */
+
+#define FPS 50
+#define RESX 40
+#define RESY 40
+#define TO_MISS_SECS 55
+#define BALLDX 16
+#define BALLDY 4
+
+
+typedef struct PongClock
+{
+ Display *xdpy;
+ int xscreen;
+ Window xwin, xwin_root;
+ Pixmap backbuffer;
+ GC xgc;
+ int xwin_width, xwin_height;
+ int pixelw, pixelh;
+
+ int ball_x, ball_y, ball_dx, ball_dy;
+ int bata_y, batb_y;
+ Bool bata_to_miss, batb_to_miss;
+
+}
+PongClock;
+
+void
+get_time(int *hour, int *min, int *sec)
+{
+ struct timeval tv;
+ struct tm *localTime = NULL;
+ time_t actualTime;
+
+ gettimeofday(&tv, 0);
+ actualTime = tv.tv_sec;
+ localTime = localtime(&actualTime);
+
+ if (hour)
+ *hour = localTime->tm_hour;
+
+ if (min)
+ *min = localTime->tm_min;
+
+ if (sec)
+ *sec = localTime->tm_sec;
+}
+
+void
+draw_rect (PongClock *pong_clock,
+ int x,
+ int y,
+ int width,
+ int height)
+{
+ XFillRectangle (pong_clock->xdpy,
+ pong_clock->backbuffer,
+ pong_clock->xgc,
+ x * pong_clock->pixelw,
+ y * pong_clock->pixelh,
+ width * pong_clock->pixelw,
+ height * pong_clock->pixelh);
+}
+
+void
+draw_field (PongClock *pong_clock)
+{
+ int i;
+
+ draw_rect (pong_clock, 0, 0, RESX+1, 1);
+ draw_rect (pong_clock, 0, RESY-1, RESX+1, 1);
+
+ for (i=0; i < RESY/2; i++)
+ draw_rect (pong_clock, (RESX/2)-1, i*2, 2, 1);
+}
+
+void
+draw_digit (PongClock *pong_clock,
+ int x,
+ int y,
+ int digit)
+{
+ int digits[] = { 0x1f8c63f, 0x1f21086, 0x1f0fe1f, 0x1f87e1f, 0x1087e31,
+ 0x1f87c3f, 0x1f8fc3f, 0x84421f, 0x1f8fe3f, 0x1087e3f };
+
+ XRectangle rects[5*5];
+ int i,j,k;
+
+ i = 0;
+
+ for (k=0; k<5; k++)
+ for (j=0; j<5; j++)
+ if (digits[digit] & (1 << ((k*5)+j)))
+ {
+ rects[i].x = (x + j) * pong_clock->pixelw;
+ rects[i].y = (y + k) * pong_clock->pixelh;
+ rects[i].width = pong_clock->pixelw;
+ rects[i].height = pong_clock->pixelh;
+ i++;
+ }
+
+ XFillRectangles (pong_clock->xdpy,
+ pong_clock->backbuffer,
+ pong_clock->xgc,
+ rects, i);
+}
+
+void
+draw_time (PongClock *pong_clock)
+{
+ int hour, min;
+
+ get_time(&hour, &min, NULL);
+
+ draw_digit (pong_clock,
+ (RESX/2) - 14,
+ 5,
+ hour / 10 );
+
+ draw_digit (pong_clock,
+ (RESX/2) - 8,
+ 5,
+ hour % 10 );
+
+ draw_digit (pong_clock,
+ (RESX/2) + 3,
+ 5,
+ min / 10 );
+
+ draw_digit (pong_clock,
+ (RESX/2) + 9,
+ 5,
+ min % 10 );
+}
+
+void
+draw_bat_and_ball (PongClock *pong_clock)
+{
+ /* ball */
+
+ XFillRectangle (pong_clock->xdpy,
+ pong_clock->backbuffer,
+ pong_clock->xgc,
+ pong_clock->ball_x,
+ pong_clock->ball_y,
+ pong_clock->pixelw,
+ pong_clock->pixelh);
+
+ /* bat a */
+
+ XFillRectangle (pong_clock->xdpy,
+ pong_clock->backbuffer,
+ pong_clock->xgc,
+ 0,
+ pong_clock->bata_y - (2 * pong_clock->pixelh),
+ pong_clock->pixelw,
+ pong_clock->pixelh * 5);
+
+ /* bat b */
+
+ XFillRectangle (pong_clock->xdpy,
+ pong_clock->backbuffer,
+ pong_clock->xgc,
+ (pong_clock->xwin_width - pong_clock->pixelw),
+ pong_clock->batb_y - (2 * pong_clock->pixelh),
+ pong_clock->pixelw,
+ pong_clock->pixelh * 5);
+
+}
+
+void
+update_state (PongClock *pong_clock)
+{
+ int sec, min, hour;
+
+ get_time(&hour, &min, &sec);
+
+ /* Check ball is on field and no ones dues to miss a shot.
+ */
+ if ( (pong_clock->ball_x < 0 && !pong_clock->bata_to_miss)
+ || (pong_clock->ball_x > (pong_clock->xwin_width - pong_clock->pixelw)
+ && !pong_clock->batb_to_miss) )
+ pong_clock->ball_dx *= -1;
+
+ if ((pong_clock->ball_y < pong_clock->pixelh)
+ || pong_clock->ball_y > (pong_clock->xwin_height - (2*pong_clock->pixelh)))
+ pong_clock->ball_dy *= -1;
+
+ pong_clock->ball_x += pong_clock->ball_dx;
+ pong_clock->ball_y += pong_clock->ball_dy;
+
+ /* Set up someone to miss if we getting close to an hour or min.
+ */
+ if (sec > TO_MISS_SECS)
+ {
+ if (min == 59)
+ pong_clock->batb_to_miss = True;
+ else
+ pong_clock->bata_to_miss = True;
+ }
+ else
+ {
+ /* Reset the game */
+ if (pong_clock->bata_to_miss)
+ {
+ pong_clock->bata_to_miss = False;
+ pong_clock->ball_y = pong_clock->bata_y;
+ pong_clock->ball_x = pong_clock->pixelw;
+ pong_clock->ball_dx *= -1;
+ }
+
+ if (pong_clock->batb_to_miss)
+ {
+ pong_clock->batb_to_miss = False;
+ pong_clock->ball_y = pong_clock->batb_y;
+ pong_clock->ball_x = pong_clock->xwin_width - pong_clock->pixelw;
+ pong_clock->ball_dx *= -1;
+ }
+ }
+
+ /* Keep bats on field and only move in not setup to miss */
+ if (pong_clock->ball_y >= (3*pong_clock->pixelh)
+ && pong_clock->ball_y <= (pong_clock->xwin_height - (5*pong_clock->pixelh)))
+ {
+ if (!pong_clock->batb_to_miss)
+ pong_clock->batb_y = pong_clock->ball_y;
+
+ if (!pong_clock->bata_to_miss)
+ pong_clock->bata_y = pong_clock->ball_y;
+ }
+}
+
+void
+draw_frame (PongClock *pong_clock)
+{
+ update_state (pong_clock);
+
+ /* Clear playfield */
+ XSetForeground (pong_clock->xdpy,
+ pong_clock->xgc,
+ BlackPixel(pong_clock->xdpy,
+ pong_clock->xscreen));
+
+ XFillRectangle (pong_clock->xdpy,
+ pong_clock->backbuffer,
+ pong_clock->xgc,
+ 0, 0,
+ pong_clock->xwin_width,
+ pong_clock->xwin_height);
+
+ XSetForeground (pong_clock->xdpy,
+ pong_clock->xgc,
+ WhitePixel(pong_clock->xdpy,
+ pong_clock->xscreen));
+
+ draw_field (pong_clock);
+
+ draw_time (pong_clock);
+
+ draw_bat_and_ball (pong_clock);
+
+ /* flip 'backbuffer' */
+ XSetWindowBackgroundPixmap (pong_clock->xdpy,
+ pong_clock->xwin,
+ pong_clock->backbuffer);
+ XClearWindow(pong_clock->xdpy, pong_clock->xwin);
+
+ XSync(pong_clock->xdpy, False);
+}
+
+int
+main (int argc, char **argv)
+{
+ XGCValues gcv;
+ Atom atoms_WINDOW_STATE, atoms_WINDOW_STATE_FULLSCREEN;
+ PongClock *pong_clock;
+
+ pong_clock = malloc(sizeof(PongClock));
+ memset(pong_clock, 0, sizeof(PongClock));
+
+ if ((pong_clock->xdpy = XOpenDisplay(getenv("DISPLAY"))) == NULL) {
+ fprintf(stderr, "Cannot connect to X server on display %s.",
+ getenv("DISPLAY"));
+ exit(-1);
+ }
+
+ pong_clock->xscreen = DefaultScreen(pong_clock->xdpy);
+ pong_clock->xwin_root = DefaultRootWindow(pong_clock->xdpy);
+ pong_clock->xwin_width = DisplayWidth(pong_clock->xdpy,
+ pong_clock->xscreen);
+ pong_clock->xwin_height = DisplayHeight(pong_clock->xdpy,
+ pong_clock->xscreen);
+
+ pong_clock->pixelw = pong_clock->xwin_width / RESX;
+ pong_clock->pixelh = pong_clock->xwin_height / RESY;
+
+ pong_clock->ball_x = 0;
+ pong_clock->ball_y = pong_clock->xwin_height / 2;
+
+ pong_clock->ball_dx = BALLDX;
+ pong_clock->ball_dy = BALLDY;
+
+ pong_clock->batb_y = pong_clock->bata_y = pong_clock->ball_y;
+
+ gcv.background = BlackPixel(pong_clock->xdpy,
+ pong_clock->xscreen);
+ gcv.foreground = WhitePixel(pong_clock->xdpy,
+ pong_clock->xscreen);
+ gcv.graphics_exposures = False;
+
+ pong_clock->xgc = XCreateGC (pong_clock->xdpy, pong_clock->xwin_root,
+ GCForeground|GCBackground|GCGraphicsExposures,
+ &gcv);
+
+ atoms_WINDOW_STATE
+ = XInternAtom(pong_clock->xdpy, "_NET_WM_STATE",False);
+ atoms_WINDOW_STATE_FULLSCREEN
+ = XInternAtom(pong_clock->xdpy, "_NET_WM_STATE_FULLSCREEN",False);
+
+ pong_clock->xwin = XCreateSimpleWindow(pong_clock->xdpy,
+ pong_clock->xwin_root,
+ 0, 0,
+ pong_clock->xwin_width,
+ pong_clock->xwin_height,
+ 0,
+ WhitePixel(pong_clock->xdpy,
+ pong_clock->xscreen),
+ BlackPixel(pong_clock->xdpy,
+ pong_clock->xscreen));
+
+ pong_clock->backbuffer = XCreatePixmap(pong_clock->xdpy,
+ pong_clock->xwin_root,
+ pong_clock->xwin_width,
+ pong_clock->xwin_height,
+ DefaultDepth(pong_clock->xdpy,
+ pong_clock->xscreen));
+
+ XSelectInput(pong_clock->xdpy, pong_clock->xwin, KeyPressMask);
+
+
+ /* Set the hints for fullscreen */
+ XChangeProperty(pong_clock->xdpy,
+ pong_clock->xwin,
+ atoms_WINDOW_STATE,
+ XA_ATOM,
+ 32,
+ PropModeReplace,
+ (unsigned char *) &atoms_WINDOW_STATE_FULLSCREEN, 1);
+
+ XMapWindow(pong_clock->xdpy, pong_clock->xwin);
+
+ while (True)
+ {
+ struct timeval timeout;
+ XEvent xev;
+
+ timeout.tv_sec = 0;
+ timeout.tv_usec = 1000000 / FPS;
+ select (0, NULL, NULL, NULL, &timeout);
+
+ draw_frame (pong_clock);
+
+ XFlush(pong_clock->xdpy);
+
+ if (XPending(pong_clock->xdpy))
+ {
+ if (XCheckMaskEvent(pong_clock->xdpy,
+ KeyPressMask,
+ &xev))
+ exit(-1);
+ }
+ }
+}
