// redraw the whole screen
void redraw_game(GAME *game) {
// redraw the main window (containg the border and stuff)
clear();
draw_border(game);
redrawwin(stdscr);
refresh();
// redraw the fruits
redraw_fruits(&game->fruits);
// redraw the snake
redraw_snake(&game->snake);
}
static void game_pause (void)
{
int button;
rb->lcd_clear_display();
rb->lcd_getstringsize("Paused",&strwdt,&strhgt);
rb->lcd_putsxy((LCD_WIDTH - strwdt)/2,LCD_HEIGHT/2,"Paused");
rb->lcd_update();
while (1)
{
button = rb->button_get(true);
switch (button)
{
case SNAKE2_PLAYPAUSE:
redraw();
redraw_snake();
draw_head_bit(headx, heady);
rb->lcd_update();
rb->sleep(HZ/2);
return;
#ifdef SNAKE2_RC_QUIT
case SNAKE2_RC_QUIT:
#endif
case SNAKE2_QUIT:
dead = 1;
quit = 1;
return;
default:
if (rb->default_event_handler(button)==SYS_USB_CONNECTED) {
dead = 1;
quit = 2;
return;
}
break;
}
}
}
// move the snake
int move_snake(GAME *game) {
int success = 1, i;
// some variables containing positions of certain things
int curx, cury, tmpy, tmpx;
// callbacks to check collisions
int (*collision_checks[EVENTS])(GAME*, int, int) = {
check_self_collision,
check_extended_border_collision,
check_fruit_collision
};
// callbacks which will be called automaticly if a collision is detected
// the callback at position 1 in the array belongs to the check-function
// at position 1 from the array above
int (*collision_handlers[EVENTS])(GAME*, int, int) = {
check_self_collision_handler,
check_border_collision_handler,
check_fruit_collision_handler
};
// difference on x-axis according to the direction
int xdiff = game->snake.dir == DIR_LEFT ? -1 : (game->snake.dir == DIR_RIGHT ? 1 : 0);
// difference on y-axis according to the direction
int ydiff = game->snake.dir == DIR_UP ? -1 : (game->snake.dir == DIR_DOWN ? 1 : 0);
// the position of the snake head
getbegyx(game->snake.parts[0], cury, curx);
// make a copy
tmpy = cury;
tmpx = curx;
// calculate the new position and prevent from exceeding the size of the screen
cury = (cury + ydiff) % game->rows;
curx = (curx + xdiff) % game->columns;
// the values have to be positive
cury = cury < 0 ? game->rows + cury : cury;
curx = curx < 0 ? game->columns + curx : curx;
// check for collisons and execute the handlers if a collision occured
for(i = 0; i < EVENTS && success; i++) {
// collision?
if((collision_checks[i](game, cury, curx))) {
// should we end the game because of the collision?
if(!collision_handlers[i](game, cury, curx)) {
success = 0;
}
}
}
// no collisions ?
if(success) {
// set the direction of the head
mvwprintw(game->snake.parts[0], 0, 0, "%c", game->snake.dir);
// move the window
mvwin(game->snake.parts[0], cury, curx);
// copy values back
cury = tmpy;
curx = tmpx;
// iterate through each part of the snake
for(i = 1; i < game->snake.length; i++) {
// get the position of the current part
getbegyx(game->snake.parts[i], tmpy, tmpx);
// move the part to the position of the previous one
mvwin(game->snake.parts[i], cury, curx);
// make a copy
cury = tmpy;
curx = tmpx;
}
// grow?
if(game->snake.grow > 0) {
// grow the snake
grow_snake(&game->snake, cury, curx);
// decrease the grow counter (number of times the snake will grow in the future)
game->snake.grow--;
} else {
// is the snake head on the same position as the last part of the snake was before?
getbegyx(game->snake.parts[0], tmpy, tmpx);
if(!(tmpy == cury && tmpx == curx)) {
// if no print a space at this position
WINDOW *cur = newwin(1, 1, cury, curx);
wprintw(cur, "%c", ' ');
wrefresh(cur);
delwin(cur);
}
}
// redraw the snake on the screen
redraw_snake(&game->snake);
} else {
SDL_LockAudio();
oamlPlaySfx("lose");
SDL_UnlockAudio();
}
return success;
}
