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snake.cpp
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snake.cpp
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#include <iostream>
#include <stdlib.h>
#include <string.h>
#include <ctime>
#include <termios.h>
#include <unistd.h>
#include <sys/select.h>
using namespace std;
#ifdef _WIN32
#elif __linux__
struct termios orig_termios;
void reset_terminal_mode() //Retorna para o terminal original
{
tcsetattr(0, TCSANOW, &orig_termios);
}
void set_conio_terminal_mode() //Configura terminal especial
{
struct termios new_termios;
/* take two copies - one for now, one for later */
tcgetattr(0, &orig_termios);
memcpy(&new_termios, &orig_termios, sizeof(new_termios));
/* register cleanup handler, and set the new terminal mode */
atexit(reset_terminal_mode);
cfmakeraw(&new_termios);
tcsetattr(0, TCSANOW, &new_termios);
}
/* Ckecks if keyboard was hit */
int kbhit()
{
struct timeval tv = { 0L, 0L };
fd_set fds;
FD_ZERO(&fds);
FD_SET(0, &fds);
return select(1, &fds, NULL, NULL, &tv);
}
/* Gets char from keyboard */
int getch()
{
int r;
unsigned char c;
if ((r = read(0, &c, sizeof(c))) < 0) {
return r;
} else {
return c;
}
}
#endif
#define WIDTH 25
#define HEIGHT 15
struct node
{
int x;
int y;
node *next;
node *before;
};
/* Returns an integer in range [min, max] */
int rand_range (int min, int max)
{
srand(clock());
return rand()*1.0/(RAND_MAX-1) * (max+1-min) + min;
}
bool prob (float x)
{
srand(clock());
return x > (double)rand() / ((double)RAND_MAX + 1);
}
/* Returns time now */
double time_now()
{
return double (clock())/CLOCKS_PER_SEC;
}
/* Returns maximum number between x and y */
double max (double x, double y) {
if (x > y) return x;
return y;
}
/* Creates and returns pointer to a node in the list after *last */
node *createNode (node *last, int pos_x, int pos_y)
{
node *new_node = new(node);
new_node->x = pos_x;
new_node->y = pos_y;
new_node->before = last;
new_node->next = last->next;
last->next->before = new_node;
last->next = new_node;
return new_node;
}
/* Checks if pair [i,j] belongs to list *first */
bool belongsList (node *first, int size, int i, int j)
{
int k;
node *p;
for (k = 0, p = first; k < size; p = p->next, k++)
if (p->x == i && p->y == j) return true;
return false;
}
/* Sets new position to fruit. New position can't be in the snake */
void resetFruit (node *first, int size, int *x, int *y)
{
while (belongsList (first, size, *x, *y)){
*x = rand_range(1, WIDTH-2);
*y = rand_range(1, HEIGHT-2);
}
}
/* Prints out list */
void printList (node *first, int size) {
int i;
node *p;
cout << "lista:" << endl;
for (i = 0, p = first; i < size; p = p->next, i++)
cout << "[" << p->x << ", " << p->y << "]" << endl;
}
bool hitsTail (node *first, int size, int x, int y)
{
if (belongsList(first->next, size-1, x, y))
return true;
return false;
}
int main ()
{
bool gameOver = false;
int score = 0;
char input;
double t1 = time_now();
double t2 = t1;
double DELAY = 0.15;
double remTimeF;
int fx = rand_range(1, WIDTH-2);
int fy = rand_range(1, HEIGHT-2);
int SPx = rand_range(1, WIDTH-2);
int SPy = rand_range(1, HEIGHT-2);
bool SPfruit = false;
int x_before, y_before;
int size = 1;
node head, first, second, third;
node *last = &first;
first.x = WIDTH/2;
first.y = HEIGHT/2;
first.next = &first;
first.before = &first;
while (!gameOver) {
/* SETUP TERMINAL */
set_conio_terminal_mode();
//DELAY is set to change, giving proression in dificulty
DELAY = max(0.1 - 0.0003*(double)(score/10), 0.03);
while (!kbhit() && t1-t2 < DELAY) t1 = time_now();
if (t1-t2 < DELAY) input = getch();
t2 = t1;
reset_terminal_mode();
system ("clear");
/*----------------*/
/* INPUT */
x_before = first.x;
y_before = first.y;
switch (input) {
case 'w':
case 'W':
first.y--;
break;
case 's':
case 'S':
first.y++;
break;
case 'a':
case 'A':
first.x--;
break;
case 'd':
case 'D':
first.x++;
break;
case 'q':
case 'Q':
gameOver = true;
break;
}
/*-------*/
/* LOGIC */
//Hits Fruit
if (fx == first.x && fy == first.y) {
score += 10;
size++;
last = createNode (last, fx, fy);
resetFruit (&first, size, &fx, &fy);
if (!SPfruit && prob (0.25)) {
SPfruit = true;
resetFruit (&first, size, &SPx, &SPy);
remTimeF = 3.5;
}
}
if (SPfruit) remTimeF -= DELAY;
if (remTimeF <= 0) SPfruit = false;
//Hits Special Fruit
if (SPfruit && SPx == first.x && SPy == first.y) {
score += 30;
size += 3;
for (int i = 0; i < 3; i++) last = createNode (last, fx, fy);
resetFruit (&first, size, &SPx, &SPy);
SPfruit = false;
}
//Move
if (size > 1){
last->x = x_before;
last->y = y_before;
last = last->before;
}
//Hits Tail
if (size > 1)
if (hitsTail (&first, size, first.x, first.y)) gameOver = true;
//Hits Wall
if (first.x == WIDTH || first.x == -1 || first.y == HEIGHT || first.y == -1) gameOver = true;
/*-------*/
/* DRAW */
cout << "Score: " << score << endl;
for (int i = 0; i <= WIDTH+1; i++) cout << '#';
cout << endl;
for (int y = 0; y < HEIGHT; y++) {
cout << '#';
for (int x = 0; x < WIDTH; x++) {
if (belongsList (&first, size, x, y)) cout << 'O';
else if (x == fx && y == fy) cout << 'x';
else if (SPfruit && x == SPx && y == SPy) cout << '@';
else cout << ' ';
}
cout << '#' << endl;
}
for (int i = 0; i <= WIDTH+1; i++) cout << '#';
cout << endl;
if (SPfruit) cout << "Remaining Time: " << remTimeF << endl;
/*------*/
}
system ("clear");
cout << endl;
cout << " =================== " << endl;
cout << " ==== GAME OVER ==== " << endl;
cout << " =================== " << endl << endl;
cout << "Score: " << score << endl << endl;
return 0;
}