/* TODO: Check manpage for all functions I use and ensure my includes are correct. I don't want to depend on picking up includes via screenhack.h. */
/* TODO: Verify everything in this file is C89. Get rid of things like '//' comments, pack all my declarations upfront, no stdint, etc. */
-/* TODO: Tabs -> Spaces before each commit. */
#include "screenhack.h"
// Command line options
// directory to output XBM files of each run (and call an external command to convert to PNGs?)
+// -save-dir STRING
// number of generations to simulate
+// -num-generations N
// delay time (speed of simulation)
+// -delay-usec N
// foreground and background color
+// ??? (strings of some sort, but I need to look up what X resources to interact with)
// display info overlay with CA number and start conditions?
+// -overlay
// which ruleset number to use? Or random? Or random from small set of hand-selected interesting examples?
+// In order of precedence:
+// -random (select a random rule on each run)
+// -rule N (always simulate Rule N on each run)
+// (if neither of the above two are specified, then a random CURATED rule is selected on each run)
// which starting population to use? Or random? Or one bit in middle? Or one bit on edge? (For random: Can I allow specifying a density like 25%, 50%, 75%?)
+// Options (with precedence): -population STRING (string is a comma separated list of cell IDs to populate, starting from 0)
+// -population-curated
+// -population-random
+// size of pixel square (e.g. 1x1, 2x2, 3x3, etc)
+// -pixel-size N
struct state {
/* Various X resources */
// TODO: Explain that this holds the whole evolution of the CA and the actual displayed visualization is simply a snapshot into this pixmap.
Pixmap evolution_history;
- size_t num_generations;
// TODO: Explain all of these.
- int delay_microsec; // per generation
unsigned long fg, bg;
int xlim, ylim, ypos; // explain roughly how and where we use these. Note: I'm not thrilled xlim/ylim since they are actually the width of the display, not the limit of the index (off by one). Change those names.
Bool display_info;
- // TODO: Add an option for 'pixel size', so the user can define 1x1 or 2x2 or 3x3 or ... pixels. But then I need to deal with leftover pixels.
Bool * current_generation;
- uint8_t ruleset;
+
+ // TODO: Describe these.
+ uint8_t rule_number; // Note: This is not a CLI option. You're thinking of rule_requested.
+ uint8_t rule_requested; // Note: Repurposing Rule 0 as a null value.
+ Bool rule_random;
+
+ /* Misc Commandline Options */
+ int pixel_size; /* Size of CA cell in pixels (e.g. pixel_size=3 means 3x3 pixels per cell). */
+ int delay_microsec; /* Requested delay to screenhack framework before next call to WolframAutomata_draw(). */
+ int num_generations; /* Number of generations of the CA to simulate before restarting. */
+
+ /* Expository Variables - Not strictly necessary, but makes some code easier to read. */
+ size_t number_of_cells;
+};
+
+// TODO: Check the full set of 256 CAs for visually interesting examples.
+static const uint8_t curated_rule_list[] = {
+ 22,
+ 30,
+ 45,
+ 57,
+ 73,
+ 86
};
static void *
state->bg = gcv.background = get_pixel_resource(state->dpy, xgwa.colormap, "background", "Background");
state->gc = XCreateGC(state->dpy, state->win, GCForeground, &gcv);
- state->delay_microsec = get_integer_resource(state->dpy, "delay", "Integer");
+ state->delay_microsec = get_integer_resource(state->dpy, "delay-usec", "Integer");
if (state->delay_microsec < 0) state->delay_microsec = 0;
+ state->pixel_size = get_integer_resource(state->dpy, "pixel-size", "Integer");
+ if (state->pixel_size < 1) state->pixel_size = 1;
+ if (state->pixel_size > state->xlim) state->pixel_size = state->xlim;
+
+ state->number_of_cells = state->xlim / state->pixel_size;
+
+ /* 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. */
+ state->num_generations = get_integer_resource(state->dpy, "num-generations", "Integer");
+ if (state->num_generations < 0) state->num_generations = 2;
+
+ /* 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_rule_list)/sizeof(curated_rule_list[0]);
+ state->rule_number = curated_rule_list[random() % number_of_array_elements];
+ }
+
// 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->ruleset = 30;
- state->num_generations = 10000; // TODO: Enforce that this is >1 in order to hold the seed generation and at least one pass through WolframAutomata_draw(), which is where we check for a full pixmap.
- state->current_generation = calloc(1, (sizeof(*(state->current_generation))*(state->xlim))); // TODO: Check calloc() call TODO: Can't recall precedence; can I eliminate any parenthesis?
+ state->current_generation = calloc(1, (sizeof(*(state->current_generation))*state->number_of_cells)); // TODO: Check calloc() call TODO: Can't recall precedence; can I eliminate any parenthesis?
// TODO: Make the starting state a user-configurable option. At least give the user some options like 'random', 'one-middle', 'one edge', etc.
// Ideally accept something like a list of integers representing starting pixels to be "on".
- state->current_generation[state->xlim-1] = True;
+ state->current_generation[0] = True;
- state->evolution_history = XCreatePixmap(state->dpy, state->win, state->xlim, state->num_generations, xgwa.depth);
+ 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.
XSetForeground(state->dpy, state->gc, state->bg);
- XFillRectangle(state->dpy, state->evolution_history, state->gc, 0, 0, state->xlim, state->num_generations);
+ 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);
// TODO: Need to draw starting generation on pixmap and increment state->ypos.
sindex(struct state * state, int index)
{
while (index < 0) {
- index += state->xlim;
+ index += state->number_of_cells;
}
- while (index >= state->xlim) {
- index -= state->xlim;
+ while (index >= state->number_of_cells) {
+ index -= state->number_of_cells;
}
return (size_t) index;
}
cell_pattern |= 1;
}
}
- if ((state->ruleset >> cell_pattern) & 1) {
+ if ((state->rule_number >> cell_pattern) & 1) {
return True;
} else {
return False;
render_current_generation(struct state * state)
{
size_t xpos;
- for (xpos = 0; xpos < state->xlim; xpos++) {
+ for (xpos = 0; xpos < state->number_of_cells; xpos++) {
if (state->current_generation[xpos] == True) {
- XFillRectangle(state->dpy, state->evolution_history, state->gc, xpos, state->ypos, 1, 1);
+ XFillRectangle(state->dpy, state->evolution_history, state->gc, xpos*state->pixel_size, state->ypos, state->pixel_size, state->pixel_size);
}
}
}
int window_y_offset;
Bool new_generation[state->xlim];
- for (xpos = 0; xpos < state->xlim; xpos++) {
+ for (xpos = 0; xpos < state->number_of_cells; xpos++) {
new_generation[xpos] = calculate_cell(state, xpos);
}
- for (xpos = 0; xpos < state->xlim; xpos++) {
+ for (xpos = 0; xpos < state->number_of_cells; xpos++) {
state->current_generation[xpos] = new_generation[xpos];
}
render_current_generation(state);
// Was this the final generation of this particular simulation? If so, give
// the user a moment to bask in the glory of our output and then start a
// new simulation.
- if (state->ypos < state->num_generations-1) {
- state->ypos++;
+ if (state->ypos/state->pixel_size < state->num_generations-1) {
+ state->ypos += state->pixel_size;
} else {
// TODO: Wait for a second or two, clear the screen and do a new iteration with suitably changed settings.
// Note: Since we can't actually loop or sleep here, we need to add a flag to the state struct to indicate that we're in an 'admiration timewindow' (and indicate when it should end)
+ printf("infinite hamster wheel\n");
while (1) continue;
}
return state->delay_microsec;
}
+// TODO: Fix formatting
static const char * WolframAutomata_defaults[] = {
".background: black",
".foreground: white",
- "*delay: 2500",
+ "*delay-usec: 25000",
+ // TODO: Difference between dot and asterisk? Presumably the asterisk matches all resouces of attribute "pixelsize"? Apply answer to all new options.
+ "*pixel-size: 2",
+ "*num-generations: 5000",
+ "*rule-requested: 0",
+ "*rule-random: False",
0
};
+// TODO: Fix formatting
static XrmOptionDescRec WolframAutomata_options[] = {
- { "-delay", ".delay", XrmoptionSepArg, 0 },
+ { "-delay-usec", ".delay-usec", XrmoptionSepArg, 0 },
+ { "-pixel-size", ".pixel-size", XrmoptionSepArg, 0 },
+ { "-num-generations", ".num-generations", XrmoptionSepArg, 0 },
+ { "-rule", ".rule-requested", XrmoptionSepArg, 0 },
+ { "-rule-random", ".rule-random", XrmoptionNoArg, "True" },
{ 0, 0, 0, 0 }
};
WolframAutomata_reshape(Display * dpy, Window win, void * closure, unsigned int w, unsigned int h)
{
WolframAutomata_free(dpy, win, closure);
- WolframAutomata_init(dpy, win);
+ closure = WolframAutomata_init(dpy, win);
}
XSCREENSAVER_MODULE ("1D Nearest-Neighbor Cellular Automata", WolframAutomata)