Need help with snake game

[Stupebrett]

Hello everyone! I'm currently making a snake game. Actually, it is almost done, it's just one thing I can't figure out how to do, and that is how to make the snake grow when it eats. Any help would be greatly appreciated, but please give hints or code snippets instead of complete code. I kind of want this game to be made by myself, I just need a little help with this part. The gameboard is made out of a 2D array, and it uses GetAsyncKeyState to get its moves. Also, it is a console game.

[ultifinitus]

You could use a linked list of body objects for your snake, and call add_part or something to add a component to the last body part's previous position.

[anonymous23323124]

Would you mind sharing the code which draws the snake to the screen? It is hard to suggest how to increase the snake's length when we don't know how the snake is represented and drawn.

However, I would suggest a variable unsigned length = <initial snake length> which you increment when it lands on food.

As for how you handle things after that, it does, as I said already, very much depend on how you draw the snake, but some kind of loop which performs length iterations seems like a reasonable idea.

EDIT: At this moment my name + number of posts provide the first 6 digits of Pi. Such a monumental event will not recur until I make a further 1433 posts XD

[Stupebrett]

It would probably be easier to understand how it's made up when you see the whole code.

#include "stdafx.h"
#include <iostream>
#include <ctime>
#include <cstdlib>
#include <Windows.h>

using namespace std;

void clearscreen(); //used to prevent flicker
void movement(int left, int right, int up, int down, int &y, int &x); //used to recoodrinate the snake

int main() {
	char map[20][40]; //decleares the map

		//loads the bottom and top of the map with a border
		for(int i=0; i < 40; ++i) {
			map[0][i] = '#';
			map[19][i] = '#';
		}
		//loads the rest of the map with vertical borders and space between them
		for(int i=1; i < 19; ++i) {
			for(int j=0; j < 41; ++j) {
				map[i][0] = '#';
				map[i][39] = '#';
					if(j < 39) {
					map[i][j] = ' ';
				}
			}
		}
		char snake = 'o';
		int y=9, x=19; //used to coordinate the snake
		int left=0, right=0, up=0, down=0; //used to determine which direction the snake should go
		int foodcount = 0; //counts ammount of food eaten
		int eaten = 0; //used to check if the snake ate food

		//generates the food
		char food = 'x';
		int a, b; //used to position the food
		srand(time(0));
		a = rand() % 17 + 1;
		Sleep(25);
		b = rand() % 37 + 1;
		map[a][b] = food;

		for(;;) { //the game loop
			clearscreen();
					map[y][x] = snake; //places the snake

		//displays the map
		for(int i=0; i < 20; ++i) {
			for(int j=0; j < 40; ++j) {
				cout << map[i][j];
					if(j >= 39) {
						cout << endl;
					}
			}
		}
		cout << "Food eaten: " << foodcount << endl; //displays ammount of food eaten

		//checks if the snake moves in another direction
		if(GetAsyncKeyState(VK_LEFT)) {
			right=0, up=0, down=0;
			left = 1;
		}
		else if(GetAsyncKeyState(VK_RIGHT)) {
			left=0, up=0, down=0;
			right = 1;
		}
		else if(GetAsyncKeyState(VK_UP)) {
			right=0, left=0, down=0;
			up = 1;
		}
		else if(GetAsyncKeyState(VK_DOWN)) {
			left=0, up=0, right=0;
			down = 1;
		}
			//moves the snake
			map[y][x] = ' ';
		movement(left, right, up, down, y, x);
			map[y][x] = snake;

			//checks if the player crashed into the border
			if(x == 0 || y == 0 || x == 39 || y == 19) {
				cout << "\nYou lost!" << endl;
				cin.get();
				return 0;
			}
			if(map[y][x] == map[a][b]) {
				++foodcount;
				++eaten;
			}
			//if the snake ate food, generate a new one
			if(eaten > 0) {
				eaten = 0;
				a = rand() % 18 + 1;
				Sleep(25);
				b = rand() % 38 + 1;
				map[a][b] = food;
			}
		}
	return 0;
}
void movement(int left, int right, int up, int down, int &y, int &x) {
	if(left > 0) {
		--x;
		return;
	}
	else if(right > 0) {
		++x;
		return;
	}
	else if(up > 0) {
		--y;
		Sleep(20);
		return;
	}
	else if(down > 0) {
		++y;
		Sleep(20);
		return;
	}
}
void clearscreen()
{
    HANDLE hOut;
    COORD Position;

    hOut = GetStdHandle(STD_OUTPUT_HANDLE);

    Position.X = 0;
    Position.Y = 0;
    SetConsoleCursorPosition(hOut, Position);
}

[anonymous23323124]

Ok then, I slightly misunderstood what you were asking.

What ultifinitus said should work. I would in fact use std::list (apparently a "doubly linked list"). This way it would be easier to move the snake - all you would have to do is pop a piece of the snake off the back of the list and push a new one on the start.

As for growing it, you would then just push a new piece of snake onto the front of the snake, and not update it's other pieces' positions that turn.

To display the snake, you would just have to loop through the list, draw a head for the first piece and then draw the rest with \-/|, I suppose.

I'm not sure I've been very clear, but I hope this helps :)