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/*****************************************************************************\
* *
* Programm: Snake *
* License: GPL (General Puplic License) *
* Last Change: 2003-04-23 *
* Authors: Justin Todd <gameprogrammer@excite.com> *
* Clemens Kirchgatterer <clemens@thf.ath.cx> *
* *
\*****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "../display.h"
#include "../defines.h"
#define WIDTH 36
#define HEIGHT 27
#define EMPTY 0
#define FRUIT 1
#define SNAKE 2
static unsigned char field[HEIGHT][WIDTH];
static bool running, stopped;
static int key;
static int posx, posy, dirx, diry, length;
static int score, level, fruits, halt, over, size;
static void
move_left() {
dirx = -1;
diry = 0;
}
static void
move_right() {
dirx = 1;
diry = 0;
}
static void
move_up() {
dirx = 0;
diry = -1;
}
static void
move_down() {
dirx = 0;
diry = 1;
}
static void
reset_game() {
int x, y;
posx = WIDTH/2;
posy = HEIGHT/2;
length = 3;
fruits = 0;
halt = 0;
over = 0;
score = 0;
level = 1;
switch (RAND(3)) {
case 0: move_up(); break;
case 1: move_down(); break;
case 2: move_left(); break;
case 3: move_right(); break;
}
for (y=0; y<HEIGHT; y++) {
for (x=0; x<WIDTH; x++) field[y][x] = EMPTY;
}
field[RAND(HEIGHT-1)][RAND(WIDTH-1)] = FRUIT;
}
static void
draw_block(int x, int y, int c) {
int x1, y1, x2, y2;
x1 = x*size;
y1 = y*size;
x2 = x*size+size;
y2 = y*size+size;
Dpy::rect_fill(x1, y1, x2, y2, c);
}
static void
draw_field() {
int x, y;
for (y=0; y<HEIGHT; y++) {
for (x=0; x<WIDTH; x++) {
switch (field[y][x]) {
case EMPTY: draw_block(x, y, COL_BGR); break;
case FRUIT: draw_block(x, y, COL_GRN); break;
default: draw_block(x, y, COL_WHT); break;
}
}
}
}
static void
halt_game(void) {
if (over) {
reset_game();
draw_field();
return;
}
if (halt) {
draw_field();
halt = 0;
} else {
Dpy::message_show("Pause", NULL, COL_WHT);
halt = 1;
}
Dpy::update();
}
static void
draw_score(void) {
Dpy::status_left(score, COL_WHT);
Dpy::status_right(level, COL_WHT);
}
static void
game_over(void) {
over = 1;
Dpy::message_show("Game Over", NULL, COL_WHT);
Dpy::update();
}
static void
move_snake() {
int x, y;
posx += dirx;
posy += diry;
if (field[posy][posx] >= SNAKE) {
game_over(); return;
}
if ((posx < 0) || (posx > WIDTH-1) || (posy < 0) || (posy > HEIGHT-1)) {
game_over(); return;
}
if (field[posy][posx] == FRUIT) {
x = RAND(WIDTH-1);
y = RAND(HEIGHT-1);
field[y][x] = FRUIT;
draw_block(x, y, COL_GRN);
length += level;
score += level;
fruits += 1;
if (fruits == 7) {
if (level<9) level++;
length = 3;
fruits = 0;
}
}
field[posy][posx] = SNAKE;
for (y=0; y<HEIGHT; y++) {
for (x=0; x<WIDTH; x++) {
if (field[y][x] >= SNAKE) {
if (field[y][x] >= length + SNAKE) {
field[y][x] = EMPTY;
draw_block(x, y, COL_BGR);
} else {
++field[y][x];
draw_block(x, y, COL_WHT);
}
}
}
}
}
int
snake_start(int x, int y, int s, int c) {
int X, Y, W, H;
SRND();
size = 4*s;
W = WIDTH*size;
H = HEIGHT*size;
X = DISPLAY_MINX+(int)((DISPLAY_MAXX-W-DISPLAY_MINX)*((x+9.0)/18.0));
Y = DISPLAY_MINY+(int)((DISPLAY_MAXY-H-DISPLAY_MINY)*((y+9.0)/18.0));
Dpy::open(X, Y, W, H);
Dpy::status_center("Snake", COL_WHT);
reset_game();
draw_field();
draw_score();
running = true;
stopped = false;
key = KEY_NONE;
while (running) {
switch (key) {
case KEY_LEFT: move_left(); break;
case KEY_RIGHT: move_right(); break;
case KEY_UP: move_up(); break;
case KEY_DOWN: move_down(); break;
case KEY_BACK: running = false; break;
case KEY_OK: halt_game(); break;
case KEY_NONE: break;
}
key = KEY_NONE;
usleep(10000+10000*(10-level));
if (halt || over) continue;
if (running) {
move_snake();
if (!over) {
draw_score();
Dpy::update();
}
}
}
Dpy::close();
stopped = true;
return (0);
}
int
snake_stop(void) {
running = false;
while (!stopped) usleep(10000);
return (0);
}
int
snake_key(int k) {
key = k; // XXX maybe mutex lock or cond signal?
if (key == KEY_BACK) {
snake_stop();
return (1);
}
return (0);
}
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