+ if (state->delay_microsec < 0) state->delay_microsec = 0;
+
+ /* Set the number of generations to simulate before wiping the simulation */
+ /* and re-running with new settings. */
+ if (get_boolean_resource(state->dpy, "random-num-generations", "Boolean")) {
+ /* By empirical observation, keep the product */
+ /* state->num_generations * state->pixel_size */
+ /* below 10,000 to avoid BadAlloc errors from the X server due to */
+ /* requesting an enormous pixmap. This value works on both a 12 core */
+ /* Xeon with 108 GiB of RAM and a Sun Ultra 2 with 2 GiB of RAM. */
+ state->num_generations = random() % (10000 / state->pixel_size);
+ /* Ensure selected value is large enough to at least fill the screen. */
+ /* Cast to avoid overflow. */
+ if ((long)state->num_generations * (long)state->pixel_size < state->ylim) {
+ state->num_generations = (state->ylim / state->pixel_size) + 1;
+ }
+ } else {
+ state->num_generations = get_integer_resource(state->dpy, "num-generations", "Integer");
+ }
+ /* The minimum number of generations is 2 since we must allocate enough */
+ /* space to hold the seed generation and at least one pass through */
+ /* WolframAutomata_draw(), which is where we check whether or not we've */
+ /* reached the end of the pixmap. */
+ if (state->num_generations < 0) state->num_generations = 2;
+ /* The maximum number of generations is pixel_size dependent. This is a */
+ /* soft limit and may be increased if you have plenty of RAM (and a */
+ /* cooperative X server). The value 10,000 was determined empirically. */
+ if ((long)state->num_generations * (long)state->pixel_size > 10000) {
+ state->num_generations = 10000 / state->pixel_size;
+ }
+
+ /* Time to figure out which rule to use for this simulation. */
+ /* We ignore any weirdness resulting from the following cast since every */
+ /* bit pattern is also a valid rule; if the user provides weird input, */
+ /* then we'll return weird (but well-defined!) output. */
+ state->rule_requested = (uint8_t) get_integer_resource(state->dpy, "rule-requested", "Integer");
+ state->rule_random = get_boolean_resource(state->dpy, "rule-random", "Boolean");
+ /* Through the following set of branches, we enforce CLI flag precedence. */
+ if (state->rule_random) {
+ /* If this flag is set, the user wants truly random rules rather than */
+ /* random rules from a curated list. */
+ state->rule_number = (uint8_t) random();
+ } else if (state->rule_requested != 0) {
+ /* Rule 0 is terribly uninteresting, so we are reusing it as a 'null' */
+ /* value and hoping nobody notices. Finding a non-zero value means */
+ /* the user requested a specific rule. Use it. */
+ state->rule_number = state->rule_requested;
+ } else {
+ /* No command-line options were specified, so select rules randomly */
+ /* from a curated list. */
+ size_t number_of_array_elements = sizeof(curated_ruleset_list)/sizeof(curated_ruleset_list[0]);
+ curated_ruleset = &curated_ruleset_list[random() % number_of_array_elements];
+ state->rule_number = curated_ruleset->rule;
+ }
+
+ /* Time to construct the seed generation for this simulation. */
+ state->population_single = get_boolean_resource(state->dpy, "population-single", "Boolean");
+ state->population_density = get_integer_resource(state->dpy, "population-density", "Integer");
+ if (state->population_density < 0 || state->population_density > 100) state->population_density = 50;
+ state->current_generation = calloc(1, sizeof(*state->current_generation)*state->number_of_cells);
+ if (!state->current_generation) {
+ fprintf(stderr, "ERROR: Failed to calloc() for cell generation in WolframAutomata_init().\n");
+ exit(EXIT_FAILURE);
+ }
+ if (curated_ruleset) {
+ /* If we're using a curated ruleset, ignore any CLI flags related to */
+ /* setting the seed generation, instead drawing that information from */
+ /* the curated ruleset. */
+ switch (curated_ruleset->seed) {
+ case random_cell: generate_random_seed(state); break;
+ case middle_cell: state->current_generation[state->number_of_cells/2] = True; break;
+ case edge_cell : state->current_generation[0] = True; break;
+ }
+ } else {
+ /* If we're not using a curated ruleset, process any relevant flags */
+ /* from the user, falling back to a random seed generation if nothing */
+ /* else is specified. */
+ if (state->population_single) {
+ state->current_generation[0] = True;
+ } else {
+ generate_random_seed(state);
+ }
+ }
+
+ // TODO: These should be command-line options, but I need to learn how the get_integer_resource() and similar functions work first.
+ state->display_info = True;
+
+ state->evolution_history = XCreatePixmap(state->dpy, state->win, state->xlim, state->num_generations*state->pixel_size, xgwa.depth);
+ // Pixmap contents are undefined after creation. Explicitly set a black
+ // background by drawing a black rectangle over the entire pixmap.
+ XColor blackx, blacks;
+ XAllocNamedColor(state->dpy, DefaultColormapOfScreen(DefaultScreenOfDisplay(state->dpy)), "black", &blacks, &blackx);
+ XSetForeground(state->dpy, state->gc, blacks.pixel);
+ XFillRectangle(state->dpy, state->evolution_history, state->gc, 0, 0, state->xlim, state->num_generations*state->pixel_size);
+ XSetForeground(state->dpy, state->gc, state->fg);
+ render_current_generation(state);
+ state->ypos += state->pixel_size;
+
+ return state;