gtk.c

   1 /*
   2  * gtk.c: GTK front end for my puzzle collection.
   3  */
   4
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <time.h>
   8 #include <stdarg.h>
   9
  10 #include <gtk/gtk.h>
  11 #include <gdk/gdkkeysyms.h>
  12
  13 #include "puzzles.h"
  14
  15 /* ----------------------------------------------------------------------
  16  * Error reporting functions used elsewhere.
  17  */
  18
  19 void fatal(char *fmt, ...)
  20 {
  21     va_list ap;
  22
  23     fprintf(stderr, "fatal error: ");
  24
  25     va_start(ap, fmt);
  26     vfprintf(stderr, fmt, ap);
  27     va_end(ap);
  28
  29     fprintf(stderr, "\n");
  30     exit(1);
  31 }
  32
  33 /* ----------------------------------------------------------------------
  34  * GTK front end to puzzles.
  35  */
  36
  37 /*
  38  * This structure holds all the data relevant to a single window.
  39  * In principle this would allow us to open multiple independent
  40  * puzzle windows, although I can't currently see any real point in
  41  * doing so. I'm just coding cleanly because there's no
  42  * particularly good reason not to.
  43  */
  44 struct frontend {
  45     GtkWidget *window;
  46     GtkWidget *area;
  47     GdkPixmap *pixmap;
  48     GdkColor *colours;
  49     int ncolours;
  50     GdkColormap *colmap;
  51     int w, h;
  52     midend_data *me;
  53     GdkGC *gc;
  54     int bbox_l, bbox_r, bbox_u, bbox_d;
  55     int timer_active;
  56 };
  57
  58 void frontend_default_colour(frontend *fe, float *output)
  59 {
  60     GdkColor col = fe->window->style->bg[GTK_STATE_NORMAL];
  61     output[0] = col.red / 65535.0;
  62     output[1] = col.green / 65535.0;
  63     output[2] = col.blue / 65535.0;
  64 }
  65
  66 void start_draw(frontend *fe)
  67 {
  68     fe->gc = gdk_gc_new(fe->area->window);
  69     fe->bbox_l = fe->w;
  70     fe->bbox_r = 0;
  71     fe->bbox_u = fe->h;
  72     fe->bbox_d = 0;
  73 }
  74
  75 void draw_rect(frontend *fe, int x, int y, int w, int h, int colour)
  76 {
  77     gdk_gc_set_foreground(fe->gc, &fe->colours[colour]);
  78     gdk_draw_rectangle(fe->pixmap, fe->gc, 1, x, y, w, h);
  79 }
  80
  81 void draw_line(frontend *fe, int x1, int y1, int x2, int y2, int colour)
  82 {
  83     gdk_gc_set_foreground(fe->gc, &fe->colours[colour]);
  84     gdk_draw_line(fe->pixmap, fe->gc, x1, y1, x2, y2);
  85 }
  86
  87 void draw_polygon(frontend *fe, int *coords, int npoints,
  88                   int fill, int colour)
  89 {
  90     GdkPoint *points = snewn(npoints, GdkPoint);
  91     int i;
  92
  93     for (i = 0; i < npoints; i++) {
  94         points[i].x = coords[i*2];
  95         points[i].y = coords[i*2+1];
  96     }
  97
  98     gdk_gc_set_foreground(fe->gc, &fe->colours[colour]);
  99     gdk_draw_polygon(fe->pixmap, fe->gc, fill, points, npoints);
 100
 101     sfree(points);
 102 }
 103
 104 void draw_update(frontend *fe, int x, int y, int w, int h)
 105 {
 106     if (fe->bbox_l > x  ) fe->bbox_l = x  ;
 107     if (fe->bbox_r < x+w) fe->bbox_r = x+w;
 108     if (fe->bbox_u > y  ) fe->bbox_u = y  ;
 109     if (fe->bbox_d < y+h) fe->bbox_d = y+h;
 110 }
 111
 112 void end_draw(frontend *fe)
 113 {
 114     gdk_gc_unref(fe->gc);
 115     fe->gc = NULL;
 116
 117     if (fe->bbox_l < fe->bbox_r && fe->bbox_u < fe->bbox_d) {
 118         gdk_draw_pixmap(fe->area->window,
 119                         fe->area->style->fg_gc[GTK_WIDGET_STATE(fe->area)],
 120                         fe->pixmap,
 121                         fe->bbox_l, fe->bbox_u,
 122                         fe->bbox_l, fe->bbox_u,
 123                         fe->bbox_r - fe->bbox_l, fe->bbox_d - fe->bbox_u);
 124     }
 125 }
 126
 127 static void destroy(GtkWidget *widget, gpointer data)
 128 {
 129     gtk_main_quit();
 130 }
 131
 132 static gint key_event(GtkWidget *widget, GdkEventKey *event, gpointer data)
 133 {
 134     frontend *fe = (frontend *)data;
 135     int keyval;
 136
 137     if (!fe->pixmap)
 138         return TRUE;
 139
 140     if (event->string[0] && !event->string[1])
 141         keyval = (unsigned char)event->string[0];
 142     else if (event->keyval == GDK_Up || event->keyval == GDK_KP_Up)
 143         keyval = CURSOR_UP;
 144     else if (event->keyval == GDK_Down || event->keyval == GDK_KP_Down)
 145         keyval = CURSOR_DOWN;
 146     else if (event->keyval == GDK_Left || event->keyval == GDK_KP_Left)
 147         keyval = CURSOR_LEFT;
 148     else if (event->keyval == GDK_Right || event->keyval == GDK_KP_Right)
 149         keyval = CURSOR_RIGHT;
 150     else
 151         keyval = -1;
 152
 153     if (keyval >= 0 &&
 154         !midend_process_key(fe->me, 0, 0, keyval))
 155         gtk_widget_destroy(fe->window);
 156
 157     return TRUE;
 158 }
 159
 160 static gint button_event(GtkWidget *widget, GdkEventButton *event,
 161                          gpointer data)
 162 {
 163     frontend *fe = (frontend *)data;
 164     int button;
 165
 166     if (!fe->pixmap)
 167         return TRUE;
 168
 169     if (event->type != GDK_BUTTON_PRESS)
 170         return TRUE;
 171
 172     if (event->button == 1)
 173         button = LEFT_BUTTON;
 174     else if (event->button == 2)
 175         button = MIDDLE_BUTTON;
 176     else if (event->button == 3)
 177         button = RIGHT_BUTTON;
 178     else
 179         return FALSE;                  /* don't even know what button! */
 180
 181     if (!midend_process_key(fe->me, event->x, event->y, button))
 182         gtk_widget_destroy(fe->window);
 183
 184     return TRUE;
 185 }
 186
 187 static gint expose_area(GtkWidget *widget, GdkEventExpose *event,
 188                         gpointer data)
 189 {
 190     frontend *fe = (frontend *)data;
 191
 192     if (fe->pixmap) {
 193         gdk_draw_pixmap(widget->window,
 194                         widget->style->fg_gc[GTK_WIDGET_STATE(widget)],
 195                         fe->pixmap,
 196                         event->area.x, event->area.y,
 197                         event->area.x, event->area.y,
 198                         event->area.width, event->area.height);
 199     }
 200     return TRUE;
 201 }
 202
 203 static gint configure_area(GtkWidget *widget,
 204                            GdkEventConfigure *event, gpointer data)
 205 {
 206     frontend *fe = (frontend *)data;
 207     GdkGC *gc;
 208
 209     fe->pixmap = gdk_pixmap_new(widget->window, fe->w, fe->h, -1);
 210
 211     gc = gdk_gc_new(fe->area->window);
 212     gdk_gc_set_foreground(gc, &fe->colours[0]);
 213     gdk_draw_rectangle(fe->pixmap, gc, 1, 0, 0, fe->w, fe->h);
 214     gdk_gc_unref(gc);
 215
 216     midend_redraw(fe->me);
 217
 218     return TRUE;
 219 }
 220
 221 static gint timer_func(gpointer data)
 222 {
 223     frontend *fe = (frontend *)data;
 224
 225     if (fe->timer_active)
 226         midend_timer(fe->me, 0.02);    /* may clear timer_active */
 227
 228     return fe->timer_active;
 229 }
 230
 231 void deactivate_timer(frontend *fe)
 232 {
 233     fe->timer_active = FALSE;
 234 }
 235
 236 void activate_timer(frontend *fe)
 237 {
 238     gtk_timeout_add(20, timer_func, fe);
 239     fe->timer_active = TRUE;
 240 }
 241
 242 static frontend *new_window(void)
 243 {
 244     frontend *fe;
 245     int x, y;
 246
 247     fe = snew(frontend);
 248
 249     fe->me = midend_new(fe);
 250     midend_new_game(fe->me, NULL);
 251
 252     fe->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 253 #if 0
 254     gtk_window_set_resizable(GTK_WINDOW(fe->window), FALSE);
 255 #else
 256     gtk_window_set_policy(GTK_WINDOW(fe->window), FALSE, FALSE, TRUE);
 257 #endif
 258
 259     {
 260         int i, ncolours;
 261         float *colours;
 262         gboolean *success;
 263
 264         fe->colmap = gdk_colormap_get_system();
 265         colours = midend_colours(fe->me, &ncolours);
 266         fe->ncolours = ncolours;
 267         fe->colours = snewn(ncolours, GdkColor);
 268         for (i = 0; i < ncolours; i++) {
 269             fe->colours[i].red = colours[i*3] * 0xFFFF;
 270             fe->colours[i].green = colours[i*3+1] * 0xFFFF;
 271             fe->colours[i].blue = colours[i*3+2] * 0xFFFF;
 272         }
 273         success = snewn(ncolours, gboolean);
 274         gdk_colormap_alloc_colors(fe->colmap, fe->colours, ncolours,
 275                                   FALSE, FALSE, success);
 276         for (i = 0; i < ncolours; i++) {
 277             if (!success[i])
 278                 g_error("couldn't allocate colour %d (#%02x%02x%02x)\n",
 279                         i, fe->colours[i].red >> 8,
 280                         fe->colours[i].green >> 8,
 281                         fe->colours[i].blue >> 8);
 282         }
 283     }
 284
 285     fe->area = gtk_drawing_area_new();
 286     midend_size(fe->me, &x, &y);
 287     gtk_drawing_area_size(GTK_DRAWING_AREA(fe->area), x, y);
 288     fe->w = x;
 289     fe->h = y;
 290
 291     gtk_container_add(GTK_CONTAINER(fe->window), fe->area);
 292
 293     fe->pixmap = NULL;
 294
 295     gtk_signal_connect(GTK_OBJECT(fe->window), "destroy",
 296                        GTK_SIGNAL_FUNC(destroy), fe);
 297     gtk_signal_connect(GTK_OBJECT(fe->window), "key_press_event",
 298                        GTK_SIGNAL_FUNC(key_event), fe);
 299     gtk_signal_connect(GTK_OBJECT(fe->area), "button_press_event",
 300                        GTK_SIGNAL_FUNC(button_event), fe);
 301     gtk_signal_connect(GTK_OBJECT(fe->area), "expose_event",
 302                        GTK_SIGNAL_FUNC(expose_area), fe);
 303     gtk_signal_connect(GTK_OBJECT(fe->area), "configure_event",
 304                        GTK_SIGNAL_FUNC(configure_area), fe);
 305
 306     gtk_widget_add_events(GTK_WIDGET(fe->area), GDK_BUTTON_PRESS_MASK);
 307
 308     gtk_widget_show(fe->area);
 309     gtk_widget_show(fe->window);
 310
 311     return fe;
 312 }
 313
 314 int main(int argc, char **argv)
 315 {
 316     srand(time(NULL));
 317
 318     gtk_init(&argc, &argv);
 319     (void) new_window();
 320     gtk_main();
 321
 322     return 0;
 323 }