void SnakePart::initialize()
{
setPartType(SnakePartType::Empty);
setPartTop(false);
setPartBottom(false);
setPartLeft(false);
setPartRight(false);
}
//moves the given snake by 1 depending on the direction stored in its structure
int moveSnake( Snake *sn )
{
int px;
int py;
if( sn==NULL )
return -1;
//check if last element in the list contains
if( getPartType( sn, sn->length -1 ) == SNAKE_EATEN )
{
setPartType( sn, sn->length -1, SNAKE_PART );
sn->length++;
}
//get last recorded head coordinates
px = sn->buf[sn->head].x;
py = sn->buf[sn->head].y;
//move the head back
sn->head--;
if( sn->head < 0 )
sn->head = WIN_LENGTH - 1;
//update the position of the new head
sn->buf[sn->head].y = py;
sn->buf[sn->head].x = px;
switch( sn->dir )
{ case UP : sn->buf[sn->head].y--;
break;
case LEFT : sn->buf[sn->head].x--;
break;
case DOWN : sn->buf[sn->head].y++;
break;
case RIGHT: sn->buf[sn->head].x++;
break;
}
return 0;
}
