ref: 87d72e7e8614d96b4f61adae5fb05b0534231c4c
dir: /appl/wm/snake.b/
implement Snake;
include "sys.m";
sys: Sys;
include "draw.m";
draw: Draw;
Display, Point, Screen, Image, Rect: import draw;
include "tk.m";
tk: Tk;
include "tkclient.m";
tkclient: Tkclient;
include "keyboard.m";
include "rand.m";
rand: Rand;
include "scoretable.m";
scoretable: Scoretable;
Snake: module{
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
Tick: adt{
dt: int;
};
DX: con 30;
DY: con 30;
Size: int;
EMPTY, SNAKE, FOOD, CRASH: con iota;
HIGHSCOREFILE: con "/lib/scores/snake";
board: array of array of int;
win: ref Tk->Toplevel;
init(ctxt: ref Draw->Context, argv: list of string)
{
sys = load Sys Sys->PATH;
if (ctxt == nil) {
sys->fprint(sys->fildes(2), "snake: no window context\n");
raise "fail:bad context";
}
draw = load Draw Draw->PATH;
tkclient = load Tkclient Tkclient->PATH;
if(tkclient == nil){
sys->print("sys->fildes(2), couldn't load %s: %r\n", Tkclient->PATH);
raise "fail:bad module";
}
tkclient->init();
tk = load Tk Tk->PATH;
rand = load Rand Rand->PATH;
if(rand == nil){
sys->fprint(sys->fildes(2), "snake: cannot load %s: %r\n", Rand->PATH);
raise "fail:bad module";
}
scoretable = load Scoretable Scoretable->PATH;
if (scoretable != nil) {
(ok, err) := scoretable->init(-1, readfile("/dev/user"), "snake", HIGHSCOREFILE);
if (ok == -1) {
sys->fprint(sys->fildes(2), "snake: cannot init scoretable: %s\n", err);
scoretable = nil;
}
}
sys->pctl(Sys->NEWPGRP, nil);
ctlchan: chan of string;
(win, ctlchan) = tkclient->toplevel(ctxt, nil, "Snake", Tkclient->Hide);
tk->namechan(win, kch := chan of string, "kch");
cmd(win, "canvas .c -bd 2 -relief ridge");
cmd(win, "label .scoret -text Score:");
cmd(win, "label .score -text 0");
cmd(win, "frame .f");
if (scoretable != nil) {
cmd(win, "label .hight -text High:");
cmd(win, "label .high -text 0");
cmd(win, "pack .hight .high -in .f -side left");
}
cmd(win, "pack .score .scoret -in .f -side right");
cmd(win, "pack .f -side top -fill x");
cmd(win, "pack .c");
cmd(win, "bind .c <Key> {send kch %s}");
cmd(win, "bind . <ButtonRelease-1> {focus .c}");
cmd(win, "bind .Wm_t <ButtonRelease-1> +{focus .c}");
cmd(win, "focus .c");
Size = int cmd(win, ".c cget -actheight") / DY;
cmd(win, ".c configure -width " + string (Size * DX) + " -height " + string (Size * DY));
tkclient->onscreen(win, nil);
tkclient->startinput(win, "kbd"::"ptr"::nil);
spawn winctl(ctlchan);
if (len argv > 1)
game(kch, hd tl argv);
for(;;){
game(kch, nil);
cmd(win, ".c delete all");
}
}
winctl(ctlchan: chan of string)
{
for(;;) alt {
s := <-win.ctxt.kbd =>
tk->keyboard(win, s);
s := <-win.ctxt.ptr =>
tk->pointer(win, *s);
s := <-win.ctxt.ctl or
s = <-win.wreq or
s = <-ctlchan =>
tkclient->wmctl(win, s);
}
}
board2s(board: array of array of int): string
{
s := string DX + "." + string DY + ".";
for (y := 0; y < DY; y++)
for (x := 0; x < DX; x++)
s[len s] = board[x][y] + '0';
return s;
}
replayproc(replay: string, kch: chan of string, tick: chan of int, nil: ref Tick)
{
i := 0;
while(i < len replay){
n := 0;
while(i < len replay && replay[i] >= '0' && replay[i] <= '9') {
n = n*10 + replay[i] - '0';
i++;
}
for (t := 0; t < n; t++) {
tick <-= 1;
sys->sleep(0);
}
if (i == len replay)
break;
kch <-= string replay[i];
i++;
}
tick <-= 1;
tick <-= 0;
}
game(realkch: chan of string, replay: string)
{
scores := scoretable->scores();
if (scores != nil)
cmd(win, ".high configure -text " + string (hd scores).score);
cmd(win, ".score configure -text {0}");
board = array[DX] of { * => array[DY] of{* => EMPTY}};
seed := rand->rand(16r7fffffff);
if (replay != nil) {
seed = int replay;
for (i := 0; i < len replay; i++)
if (replay[i] == '.')
break;
if (i<len replay)
replay = replay[i+1:];
}
rand->init(seed);
p := Point(DX/2, DY/2);
dir := Point(1, 0);
lkey := 'r';
snake := array[5] of Point;
for(i := 0; i < len snake; i++){
snake[i] = p.add(dir.mul(i));
make(snake[i]);
}
placefood();
p = p.add(dir.mul(i));
ticki := ref Tick(100);
realtick := chan of int;
userkch: chan of string;
if(replay != nil) {
(userkch, realkch) = (realkch, chan of string);
spawn replayproc(replay, realkch, realtick, ticki);
} else {
userkch = chan of string;
spawn ticker(realtick, ticki);
}
cmd(win, "update");
score := 0;
leaveit := 0;
paused := 0;
log := "";
nticks := 0;
odir := dir;
dummykch := chan of string;
kch := realkch;
dummytick := chan of int;
tick := realtick;
for(;;){
alt{
c := <-kch =>
if(paused){
paused = 0;
tick = realtick;
}
kch = dummykch;
ndir := dir;
case int c{
Keyboard->Up =>
ndir = (0, -1);
Keyboard->Down =>
ndir = (0, 1);
Keyboard->Left =>
ndir = (-1, 0);
Keyboard->Right =>
ndir = (1, 0);
'q' =>
tkclient->wmctl(win, "exit");
'p' =>
paused = 1;
tick = dummytick;
kch = realkch;
}
if (!ndir.eq(dir) && !ndir.eq(dir.mul(-1))) { # don't allow 180° turn.
lkey = int c;
dir = ndir;
}
<-tick =>
if(!odir.eq(dir)) {
log += string nticks;
log[len log] = lkey;
nticks = 0;
odir = dir;
}
nticks++;
if(leaveit){
ns := array[len snake + 1] of Point;
ns[0:] = snake;
snake = ns;
leaveit = 0;
} else{
destroy(snake[0]);
snake[0:] = snake[1:];
}
np := snake[len snake - 2].add(dir);
np.x = (np.x + DX) % DX;
np.y = (np.y + DY) % DY;
snake[len snake - 1] = np;
wasfood := board[np.x][np.y] == FOOD;
if(!make(np)){
cmd(win, ".c create oval " + r2s(square(np).inset(-5)) + " -fill yellow");
cmd(win, "update");
if (scoretable != nil && replay == nil) {
board[np.x][np.y] = CRASH;
log += string nticks;
sys->print("%d.%s\n", seed, log);
scoretable->setscore(score, string seed + "." + log + " " + board2s(board));
}
ticki.dt = -1;
while(<-tick)
;
sys->sleep(750);
absorb(realkch);
if(int <-realkch == 'q')
tkclient->wmctl(win, "exit");
return;
}
if(wasfood){
score++;
#if(score % 10 == 0){
# if(ticki.dt > 0)
# ticki.dt -= 5;
#}
cmd(win, ".score configure -text " + string score);
leaveit = 1;
placefood();
}
cmd(win, "update");
kch = realkch;
}
}
}
placefood()
{
for(;;)
if(makefood((rand->rand(DX), rand->rand(DY))))
return;
}
make(p: Point): int
{
# b := board[p.x][p.y];
if(board[p.x][p.y] == SNAKE)
return 0;
cmd(win, ".c create rectangle " + r2s(square(p)) +
" -fill blue -outline {} -tags b." + string p.x + "." + string p.y);
board[p.x][p.y] = SNAKE;
return 1;
}
makefood(p: Point): int
{
b := board[p.x][p.y];
if(b == SNAKE)
return 0;
cmd(win, ".c create oval " + r2s(square(p).inset(-2)) +
" -fill red -tags b." + string p.x + "." + string p.y);
board[p.x][p.y] = FOOD;
return 1;
}
destroy(p: Point)
{
board[p.x][p.y] = 0;
cmd(win, ".c delete b." + string p.x + "." + string p.y);
}
square(p: Point): Rect
{
p = p.mul(Size);
return (p, p.add((Size, Size)));
}
ticker(tick: chan of int, ticki: ref Tick)
{
while((dt := ticki.dt) >= 0){
sys->sleep(dt);
tick <-= 1;
}
tick <-= 0;
}
absorb(c: chan of string)
{
for(;;){
alt{
<-c =>
;
* =>
return;
}
}
}
r2s(r: Rect): string
{
return sys->sprint("%d %d %d %d", r.min.x, r.min.y, r.max.x, r.max.y);
}
readfile(f: string): string
{
fd := sys->open(f, Sys->OREAD);
if (fd == nil)
return nil;
buf := array[Sys->ATOMICIO] of byte;
n := sys->read(fd, buf, len buf);
if (n <= 0)
return nil;
return string buf[0:n];
}
cmd(win: ref Tk->Toplevel, s: string): string
{
r := tk->cmd(win, s);
if(len r > 0 && r[0] == '!'){
sys->print("error executing '%s': %s\n", s, r[1:]);
}
return r;
}