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/*
OneLoneCoder.com - Command Line Snake
"Give me a break, I'm on holiday..." - @Javidx9
License
~~~~~~~
Copyright (C) 2018 Javidx9
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; See license for details.
Original works located at:
https://www.github.com/onelonecoder
https://www.onelonecoder.com
https://www.youtube.com/javidx9
GNU GPLv3
https://github.com/OneLoneCoder/videos/blob/master/LICENSE
From Javidx9 :)
~~~~~~~~~~~~~~~
Hello! Ultimately I don't care what you use this for. It's intended to be
educational, and perhaps to the oddly minded - a little bit of fun.
Please hack this, change it and use it in any way you see fit. You acknowledge
that I am not responsible for anything bad that happens as a result of
your actions. However this code is protected by GNU GPLv3, see the license in the
github repo. This means you must attribute me if you use it. You can view this
license here: https://github.com/OneLoneCoder/videos/blob/master/LICENSE
Cheers!
Background
~~~~~~~~~~
Classic Snake! Controls are Arrow keys Left & Right, eat food, grow larger, avoid self!
Author
~~~~~~
Twitter: @javidx9
Blog: www.onelonecoder.com
Video:
~~~~~~
https://youtu.be/e8lYLYlrGLg
Last Updated: 24/06/2017
*/
#include <iostream>
#include <list>
#include <thread>
using namespace std;
#include <Windows.h>
int nScreenWidth = 120;
int nScreenHeight = 30;
struct sSnakeSegment
{
int x;
int y;
};
int main()
{
// Create Screen Buffer
wchar_t *screen = new wchar_t[nScreenWidth*nScreenHeight];
for (int i = 0; i < nScreenWidth*nScreenHeight; i++) screen[i] = L' ';
HANDLE hConsole = CreateConsoleScreenBuffer(GENERIC_READ | GENERIC_WRITE, 0, NULL, CONSOLE_TEXTMODE_BUFFER, NULL);
SetConsoleActiveScreenBuffer(hConsole);
DWORD dwBytesWritten = 0;
while(1)
{
// Reset to known state
list<sSnakeSegment> snake = { {60,15},{61,15},{62,15},{63,15},{64,15},{65,15},{66,15},{67,15},{68,15},{69,15} };
int nFoodX = 30;
int nFoodY = 15;
int nScore = 0;
int nSnakeDirection = 3;
bool bDead = false;
bool bKeyLeft = false, bKeyRight = false, bKeyLeftOld = false, bKeyRightOld = false;
while (!bDead)
{
// Frame Timing, compensate for aspect ratio of command line
auto t1 = chrono::system_clock::now();
while ((chrono::system_clock::now() - t1) < ((nSnakeDirection % 2 == 1) ? 120ms : 200ms))
{
// Get Input,
bKeyRight = (0x8000 & GetAsyncKeyState((unsigned char)('\x27'))) != 0;
bKeyLeft = (0x8000 & GetAsyncKeyState((unsigned char)('\x25'))) != 0;
if (bKeyRight && !bKeyRightOld)
{
nSnakeDirection++;
if (nSnakeDirection == 4) nSnakeDirection = 0;
}
if (bKeyLeft && !bKeyLeftOld)
{
nSnakeDirection--;
if (nSnakeDirection == -1) nSnakeDirection = 3;
}
bKeyRightOld = bKeyRight;
bKeyLeftOld = bKeyLeft;
}
// ==== Logic
// Update Snake Position, place a new head at the front of the list in
// the right direction
switch (nSnakeDirection)
{
case 0: // UP
snake.push_front({ snake.front().x, snake.front().y - 1 });
break;
case 1: // RIGHT
snake.push_front({ snake.front().x + 1, snake.front().y });
break;
case 2: // DOWN
snake.push_front({ snake.front().x, snake.front().y + 1 });
break;
case 3: // LEFT
snake.push_front({ snake.front().x - 1, snake.front().y });
break;
}
// Collision Detect Snake V Food
if (snake.front().x == nFoodX && snake.front().y == nFoodY)
{
nScore++;
while (screen[nFoodY * nScreenWidth + nFoodX] != L' ')
{
nFoodX = rand() % nScreenWidth;
nFoodY = (rand() % (nScreenHeight-3))+3;
}
for (int i = 0; i < 5; i++)
snake.push_back({ snake.back().x, snake.back().y });
}
// Collision Detect Snake V World
if (snake.front().x < 0 || snake.front().x >= nScreenWidth)
bDead = true;
if (snake.front().y < 3 || snake.front().y >= nScreenHeight)
bDead = true;
// Collision Detect Snake V Snake
for (list<sSnakeSegment>::iterator i = snake.begin(); i != snake.end(); i++)
if (i != snake.begin() && i->x == snake.front().x && i->y == snake.front().y)
bDead = true;
// Chop off Snakes tail :-/
snake.pop_back();
// ==== Presentation
// Clear Screen
for (int i = 0; i < nScreenWidth*nScreenHeight; i++) screen[i] = L' ';
// Draw Stats & Border
for (int i = 0; i < nScreenWidth; i++)
{
screen[i] = L'=';
screen[2 * nScreenWidth + i] = L'=';
}
wsprintf(&screen[nScreenWidth + 5], L"www.OneLoneCoder.com - S N A K E ! ! SCORE: %d", nScore);
// Draw Snake Body
for (auto s : snake)
screen[s.y * nScreenWidth + s.x] = bDead ? L'+' : L'O';
// Draw Snake Head
screen[snake.front().y * nScreenWidth + snake.front().x] = bDead ? L'X' : L'@';
// Draw Food
screen[nFoodY * nScreenWidth + nFoodX] = L'%';
if (bDead)
wsprintf(&screen[15 * nScreenWidth + 40], L" PRESS 'SPACE' TO PLAY AGAIN ");
// Display Frame
WriteConsoleOutputCharacter(hConsole, screen, nScreenWidth * nScreenHeight, { 0,0 }, &dwBytesWritten);
}
// Wait for space
while ((0x8000 & GetAsyncKeyState((unsigned char)('\x20'))) == 0);
}
return 0;
}