snakegames.cpp

#include<iostream>
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <fcntl.h>
#include <chrono>
#include <thread>
using namespace std;

int _kbhit(void)
{
  struct termios oldt, newt;
  int ch;
  int oldf;

  tcgetattr(STDIN_FILENO, &oldt);
  newt = oldt;
  newt.c_lflag &= ~(ICANON | ECHO);
  tcsetattr(STDIN_FILENO, TCSANOW, &newt);
  oldf = fcntl(STDIN_FILENO, F_GETFL, 0);
  fcntl(STDIN_FILENO, F_SETFL, oldf | O_NONBLOCK);

  ch = getchar();

  tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
  fcntl(STDIN_FILENO, F_SETFL, oldf);

  if(ch != EOF)
  {
    ungetc(ch, stdin);
    return 1;
  }

  return 0;
}

bool gameOver;
const int width = 20;
const int height = 20;
int x, y, fruitX, fruitY, score;
int tailX[100], tailY[100];
int nTail;
enum eDirection { STOP = 0, LEFT, RIGHT, UP, DOWN};
eDirection dir;
void Setup(){
	gameOver = false;
	dir = STOP;
	x = width / 2;
	y = height / 2;
	fruitX = rand() % width;
	fruitY = rand() % height;
	score = 0;
}

void Draw(){
	system("clear");
	for(int i = 0; i < width+2; i++)
		cout << "#";
	cout << endl;

	for(int i = 0; i < height; i++){
		for(int j = 0; j < width; j++){
			if (j == 0)
				cout << "#";
			if (i == y && j == x)
				cout << "O";
			else if (i == fruitY && j == fruitX)
				cout << "F";
			else {
				bool print = false;
				for (int k = 0; k < nTail; k++){
					if (tailX[k] == j && tailY[k] == i){
						cout << "o";
						print = true;
					}	
				}
				if (!print)
					cout << " ";
			}

			if (j == width-1)
				cout << "#";
		}
		cout << endl;
	}

	for(int i = 0; i < width+2; i++)
		cout << "#";
	cout << endl;
	cout << "Score : " << score << endl;

}

void Input(){

	if(_kbhit()){
		switch (getchar()){
			case 'a':
				dir = LEFT;
			break;
			case 'd':
				dir = RIGHT;
			break;
			case 'w':
				dir = UP;
			break;
			case 's':
				dir = DOWN;
			break;
			case 'x':
				gameOver = true;
			break;
				
		}
	}

}

void Logic(){
	
	int prevX = tailX[0];
	int prevY = tailY[0];
	int prev2X, prev2Y;
	tailX[0] = x;
	tailY[0] = y;
	for (int i = 1; i < nTail; i++){
		prev2X = tailX[i];
		prev2Y = tailY[i];
		tailX[i] = prevX;
		tailY[i] = prevY;
		prevX = prev2X;
		prevY = prev2Y;
	}
	switch (dir){
		case LEFT:
			x--;
			break;
		case RIGHT:
			x++;
			break;
		case UP:
			y--;
			break;
		case DOWN:
			y++;
			break;
		default:
			break;
	}

	if (x > width || x < 0 || y > height || y < 0)
		gameOver = true;
	// optional syntax if you want the game snake is wall can't kill you
	// if (x >= width) x = 0; else if (x < 0) x = width - 1;
	// if (y >= height) y = 0; else if (y < 0) y = height - 1;

	// syntax below is if your snake hit own body so game over
	for (int i = 0; i < nTail; i++)
		if (tailX[i] == x && tailY[i] == y)
				gameOver = true;

	// syntax below to make a score and render fruit at random place
	if (x == fruitX && y == fruitY){
		score += 10;
		fruitX = rand() % width;
		fruitY = rand() % height;
		nTail++;
	}

}

int main(){
	Setup();
	while(!gameOver){
		Draw();
		Input();
		Logic();
		this_thread::sleep_for(chrono::milliseconds(80));
		//sleep(1);
	}
	return 0;
}