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1SAT_P2PKH OP_IF "ord" OP_1 "text/html;charset=utf8" OP_0 <<!DOCTYPE html>
<html>
<head>
  <title>Snake</title>
  <style>
  html, body {
    height: 100%;
    margin: 0;
  }

  body {
    background: black;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  canvas {
    border: 1px solid orange;
  }
  
          
  </style>
</head>
<body>
<h1>Snake</h1>
<div id="score">
        <p>Score: <span id="current-score">0</span></p>
        <p>Highscore: <span id="high-score">0</span></p>
<canvas width="400" height="400" id="game"></canvas>
<script>
var canvas = document.getElementById('game');
var context = canvas.getContext('2d');

var grid = 16;
var count = 0;
  
var snake = {
  x: 160,
  y: 160,
  
  // snake velocity. moves one grid length every frame in either the x or y direction
  dx: grid,
  dy: 0,
  
  // keep track of all grids the snake body occupies
  cells: [],
  
  // length of the snake. grows when eating an apple
  maxCells: 4
};
var apple = {
  x: 320,
  y: 320
};

// get random whole numbers in a specific range
// @see https://stackoverflow.com/a/1527820/2124254
function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min)) + min;
}

// game loop
function loop() {
  requestAnimationFrame(loop);

  // slow game loop to 15 fps instead of 60 (60/15 = 4)
  if (++count < 4) {
    return;
  }

  count = 0;
  context.clearRect(0,0,canvas.width,canvas.height);

  // move snake by it's velocity
  snake.x += snake.dx;
  snake.y += snake.dy;

  // wrap snake position horizontally on edge of screen
  if (snake.x < 0) {
    snake.x = canvas.width - grid;
  }
  else if (snake.x >= canvas.width) {
    snake.x = 0;
  }
  
  // wrap snake position vertically on edge of screen
  if (snake.y < 0) {
    snake.y = canvas.height - grid;
  }
  else if (snake.y >= canvas.height) {
    snake.y = 0;
  }

  // keep track of where snake has been. front of the array is always the head
  snake.cells.unshift({x: snake.x, y: snake.y});

  // remove cells as we move away from them
  if (snake.cells.length > snake.maxCells) {
    snake.cells.pop();
  }

  // draw apple
  context.fillStyle = 'orange';
  context.fillRect(apple.x, apple.y, grid-1, grid-1);

  // draw snake one cell at a time
  context.fillStyle = 'violet';
  snake.cells.forEach(function(cell, index) {
    
    // drawing 1 px smaller than the grid creates a grid effect in the snake body so you can see how long it is
    context.fillRect(cell.x, cell.y, grid-1, grid-1);  

    // snake ate apple
    if (cell.x === apple.x && cell.y === apple.y) {
      snake.maxCells++;

      // canvas is 400x400 which is 25x25 grids 
      apple.x = getRandomInt(0, 25) * grid;
      apple.y = getRandomInt(0, 25) * grid;
    }

    // check collision with all cells after this one (modified bubble sort)
    for (var i = index + 1; i < snake.cells.length; i++) {
      
      // snake occupies same space as a body part. reset game
      if (cell.x === snake.cells[i].x && cell.y === snake.cells[i].y) {
        snake.x = 160;
        snake.y = 160;
        snake.cells = [];
        snake.maxCells = 4;
        snake.dx = grid;
        snake.dy = 0;

        apple.x = getRandomInt(0, 25) * grid;
        apple.y = getRandomInt(0, 25) * grid;
      }
    }
  });
}

// listen to keyboard events to move the snake
document.addEventListener('keydown', function(e) {
  // prevent snake from backtracking on itself by checking that it's 
  // not already moving on the same axis (pressing left while moving
  // left won't do anything, and pressing right while moving left
  // shouldn't let you collide with your own body)
  
  // left arrow key
  if (e.which === 37 && snake.dx === 0) {
    snake.dx = -grid;
    snake.dy = 0;
  }
  // up arrow key
  else if (e.which === 38 && snake.dy === 0) {
    snake.dy = -grid;
    snake.dx = 0;
  }
  // right arrow key
  else if (e.which === 39 && snake.dx === 0) {
    snake.dx = grid;
    snake.dy = 0;
  }
  // down arrow key
  else if (e.which === 40 && snake.dy === 0) {
    snake.dy = grid;
    snake.dx = 0;
  }
});

// start the game
requestAnimationFrame(loop);
</script>
</body>
</html>> OP_ENDIF

#16,618,793text

<!DOCTYPE html>
<html>
<head>
  <title></title>
  <style>
  html, body {
    height: 100%;
    margin: 0;
  }

  body {
    background: black;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  canvas {
    border: 1px solid white;
  }
  </style>
</head>
<body>
<canvas width="400" height="400" id="game"></canvas>
<script>
var canvas = document.getElementById('game');
var context = canvas.getContext('2d');

var grid = 16;
var count = 0;
  
var snake = {
  x: 160,
  y: 160,
  
  // snake velocity. moves one grid length every frame in either the x or y direction
  dx: grid,
  dy: 0,
  
  // keep track of all grids the snake body occupies
  cells: [],
  
  // length of the snake. grows when eating an apple
  maxCells: 4
};
var apple = {
  x: 320,
  y: 320
};

// get random whole numbers in a specific range
// @see https://stackoverflow.com/a/1527820/2124254
function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min)) + min;
}

// game loop
function loop() {
  requestAnimationFrame(loop);

  // slow game loop to 15 fps instead of 60 (60/15 = 4)
  if (++count < 4) {
    return;
  }

  count = 0;
  context.clearRect(0,0,canvas.width,canvas.height);

  // move snake by it's velocity
  snake.x += snake.dx;
  snake.y += snake.dy;

  // wrap snake position horizontally on edge of screen
  if (snake.x < 0) {
    snake.x = canvas.width - grid;
  }
  else if (snake.x >= canvas.width) {
    snake.x = 0;
  }
  
  // wrap snake position vertically on edge of screen
  if (snake.y < 0) {
    snake.y = canvas.height - grid;
  }
  else if (snake.y >= canvas.height) {
    snake.y = 0;
  }

  // keep track of where snake has been. front of the array is always the head
  snake.cells.unshift({x: snake.x, y: snake.y});

  // remove cells as we move away from them
  if (snake.cells.length > snake.maxCells) {
    snake.cells.pop();
  }

  // draw apple
  context.fillStyle = 'red';
  context.fillRect(apple.x, apple.y, grid-1, grid-1);

  // draw snake one cell at a time
  context.fillStyle = 'green';
  snake.cells.forEach(function(cell, index) {
    
    // drawing 1 px smaller than the grid creates a grid effect in the snake body so you can see how long it is
    context.fillRect(cell.x, cell.y, grid-1, grid-1);  

    // snake ate apple
    if (cell.x === apple.x && cell.y === apple.y) {
      snake.maxCells++;

      // canvas is 400x400 which is 25x25 grids 
      apple.x = getRandomInt(0, 25) * grid;
      apple.y = getRandomInt(0, 25) * grid;
    }

    // check collision with all cells after this one (modified bubble sort)
    for (var i = index + 1; i < snake.cells.length; i++) {
      
      // snake occupies same space as a body part. reset game
      if (cell.x === snake.cells[i].x && cell.y === snake.cells[i].y) {
        snake.x = 160;
        snake.y = 160;
        snake.cells = [];
        snake.maxCells = 4;
        snake.dx = grid;
        snake.dy = 0;

        apple.x = getRandomInt(0, 25) * grid;
        apple.y = getRandomInt(0, 25) * grid;
      }
    }
  });
}

// listen to keyboard events to move the snake
document.addEventListener('keydown', function(e) {
  // prevent snake from backtracking on itself by checking that it's 
  // not already moving on the same axis (pressing left while moving
  // left won't do anything, and pressing right while moving left
  // shouldn't let you collide with your own body)
  
  // left arrow key
  if (e.which === 37 && snake.dx === 0) {
    snake.dx = -grid;
    snake.dy = 0;
  }
  // up arrow key
  else if (e.which === 38 && snake.dy === 0) {
    snake.dy = -grid;
    snake.dx = 0;
  }
  // right arrow key
  else if (e.which === 39 && snake.dx === 0) {
    snake.dx = grid;
    snake.dy = 0;
  }
  // down arrow key
  else if (e.which === 40 && snake.dy === 0) {
    snake.dy = grid;
    snake.dx = 0;
  }
});

// start the game
requestAnimationFrame(loop);
</script>
</body>
</html>

#15,276,389text

<!DOCTYPE html>
<html>
<head>
    <title>BTC Snake</title>
    <style>
        #game-board {
            width: 400px;
            height: 400px;
            background-color: #333;
            position: relative;
        }
        
        .snake-block {
            width: 20px;
            height: 20px;
            background-color: #fff;
            position: absolute;
        }
        
        #food {
            width: 20px;
            height: 20px;
            background-color: #f00;
            position: absolute;
        }
        
        #menu {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-align: center;
            display: none;
        }
        
        #menu button {
            margin: 10px;
            padding: 10px 20px;
            font-size: 16px;
        }
    </style>
</head>
<body>
    <h1>Snake</h1>
    
    <div id="game-board"></div>
    
    <div id="menu">
        <h2>Menu</h2>
        <button onclick="startGame()">Start</button>
        <button onclick="pauseGame()">Pause</button>
        <button onclick="resetGame()">Reset</button>
    </div>
    
    <script>
        // Spielvariablen
        var gameBoard = document.getElementById('game-board');
        var menu = document.getElementById('menu');
        var blockSize = 20;
        var widthInBlocks = gameBoard.offsetWidth / blockSize;
        var heightInBlocks = gameBoard.offsetHeight / blockSize;
        var score = 0;
        var gameLoop;
        var gamePaused = false;
        
        // Snake
        var snake = [
            {x: widthInBlocks / 2, y: heightInBlocks / 2}
        ];
        
        // Essen
        var food = {
            x: Math.floor(Math.random() * widthInBlocks),
            y: Math.floor(Math.random() * heightInBlocks)
        };
        
        // Spiel starten
        function startGame() {
            menu.style.display = 'none';
            gameLoop = setInterval(function() {
                if (!gamePaused) {
                    moveSnake();
                    drawSnake();
                    checkCollision();
                }
            }, 100);
        }
        
        // Spiel pausieren
        function pauseGame() {
            gamePaused = !gamePaused;
        }
        
        // Spiel zurücksetzen
        function resetGame() {
            clearInterval(gameLoop);
            snake = [{x: widthInBlocks / 2, y: heightInBlocks / 2}];
            score = 0;
            food = {
                x: Math.floor(Math.random() * widthInBlocks),
                y: Math.floor(Math.random() * heightInBlocks)
            };
            gamePaused = false;
            menu.style.display = 'block';
        }
        
        // Schlange bewegen
        function moveSnake() {
            var head = {
                x: snake[0].x + 1,
                y: snake[0].y
            };
            
            snake.unshift(head);
            
            if (head.x === food.x && head.y === food.y) {
                score++;
                createFood();
            } else {
                snake.pop();
            }
        }
        
        // Schlange zeichnen
        function drawSnake() {
            gameBoard.innerHTML = '';
            
            snake.forEach(function(block) {
                var snakeBlock = document.createElement('div');
                snakeBlock.className = 'snake-block';
                snakeBlock.style.left = block.x * blockSize + 'px';
                snakeBlock.style.top = block.y * blockSize + 'px';
                gameBoard.appendChild(snakeBlock);
            });
            
            var foodBlock = document.createElement('div');
            foodBlock.id = 'food';
            foodBlock.style.left = food.x * blockSize + 'px';
            foodBlock.style.top = food.y * blockSize + 'px';
            gameBoard.appendChild(foodBlock);
        }
        
        // Kollision überprüfen
        function checkCollision() {
            var head = snake[0];
            
            // Kollision mit den Wänden
            if (head.x < 0 || head.x === widthInBlocks || head.y < 0 || head.y === heightInBlocks) {
                gameOver();
            }
            
            // Kollision mit dem Körper
            for (var i = 1; i < snake.length; i++) {
                if (head.x === snake[i].x && head.y === snake[i].y) {
                    gameOver();
                }
            }
        }
        
        // Spiel beenden
        function gameOver() {
            clearInterval(gameLoop);
            alert('Game Over! Score: ' + score);
            resetGame();
        }
        
        // Essen erstellen
        function createFood() {
            food = {
                x: Math.floor(Math.random() * widthInBlocks),
                y: Math.floor(Math.random() * heightInBlocks)
            };
            
            // Überprüfen, ob das Essen auf der Schlange generiert wurde
            for (var i = 0; i < snake.length; i++) {
                if (food.x === snake[i].x && food.y === snake[i].y) {
                    createFood();
                    break;
                }
            }
        }
        
        // Steuerung
        document.addEventListener('keydown', function(event) {
            var direction = event.keyCode;
            
            // Pfeiltaste links
            if (direction === 37 && snake[0].x !== snake[1].x + 1) {
                snake[0].x -= 1;
            }
            
            // Pfeiltaste oben
            else if (direction === 38 && snake[0].y !== snake[1].y + 1) {
                snake[0].y -= 1;
            }
            
            // Pfeiltaste rechts
            else if (direction === 39 && snake[0].x !== snake[1].x - 1) {
                snake[0].x += 1;
            }
            
            // Pfeiltaste unten
            else if (direction === 40 && snake[0].y !== snake[1].y - 1) {
                snake[0].y += 1;
            }
        });
    </script>
</body>
</html>

#15,276,236text

<!DOCTYPE html>
<html>
<head>
    <title>Snake</title>
    <style>
        #game-board {
            width: 400px;
            height: 400px;
            background-color: #333;
            position: relative;
        }
        
        .snake-block {
            width: 20px;
            height: 20px;
            background-color: #fff;
            position: absolute;
        }
        
        #food {
            width: 20px;
            height: 20px;
            background-color: #f00;
            position: absolute;
        }
    </style>
</head>
<body>
    <h1>Snake</h1>
    
    <div id="game-board"></div>
    
    <script>
        // Spielvariablen
        var gameBoard = document.getElementById('game-board');
        var blockSize = 20;
        var widthInBlocks = gameBoard.offsetWidth / blockSize;
        var heightInBlocks = gameBoard.offsetHeight / blockSize;
        var score = 0;
        
        // Snake
        var snake = [
            {x: widthInBlocks / 2, y: heightInBlocks / 2}
        ];
        
        // Essen
        var food = {
            x: Math.floor(Math.random() * widthInBlocks),
            y: Math.floor(Math.random() * heightInBlocks)
        };
        
        // Spiel starten
        var gameLoop = setInterval(function() {
            moveSnake();
            drawSnake();
            checkCollision();
        }, 100);
        
        // Schlange bewegen
        function moveSnake() {
            var head = {
                x: snake[0].x + 1,
                y: snake[0].y
            };
            
            snake.unshift(head);
            
            if (head.x === food.x && head.y === food.y) {
                score++;
                createFood();
            } else {
                snake.pop();
            }
        }
        
        // Schlange zeichnen
        function drawSnake() {
            gameBoard.innerHTML = '';
            
            snake.forEach(function(block) {
                var snakeBlock = document.createElement('div');
                snakeBlock.className = 'snake-block';
                snakeBlock.style.left = block.x * blockSize + 'px';
                snakeBlock.style.top = block.y * blockSize + 'px';
                gameBoard.appendChild(snakeBlock);
            });
            
            var foodBlock = document.createElement('div');
            foodBlock.id = 'food';
            foodBlock.style.left = food.x * blockSize + 'px';
            foodBlock.style.top = food.y * blockSize + 'px';
            gameBoard.appendChild(foodBlock);
        }
        
        // Kollision überprüfen
        function checkCollision() {
            var head = snake[0];
            
            // Kollision mit den Wänden
            if (head.x < 0 || head.x === widthInBlocks || head.y < 0 || head.y === heightInBlocks) {
                gameOver();
            }
            
            // Kollision mit dem Körper
            for (var i = 1; i < snake.length; i++) {
                if (head.x === snake[i].x && head.y === snake[i].y) {
                    gameOver();
                }
            }
        }
        
        // Spiel beenden
        function gameOver() {
            clearInterval(gameLoop);
            alert('Game Over! Score: ' + score);
        }
        
        // Essen erstellen
        function createFood() {
            food = {
                x: Math.floor(Math.random() * widthInBlocks),
                y: Math.floor(Math.random() * heightInBlocks)
            };
            
            // Überprüfen, ob das Essen auf der Schlange generiert wurde
            for (var i = 0; i < snake.length; i++) {
                if (food.x === snake[i].x && food.y === snake[i].y) {
                    createFood();
                    break;
                }
            }
        }
        
        // Steuerung
        document.addEventListener('keydown', function(event) {
            var direction = event.keyCode;
            
            // Pfeiltaste links
            if (direction === 37 && snake[0].x !== snake[1].x + 1) {
                snake[0].x -= 1;
            }
            
            // Pfeiltaste oben
            else if (direction === 38 && snake[0].y !== snake[1].y + 1) {
                snake[0].y -= 1;
            }
            
            // Pfeiltaste rechts
            else if (direction === 39 && snake[0].x !== snake[1].x - 1) {
                snake[0].x += 1;
            }
            
            // Pfeiltaste unten
            else if (direction === 40 && snake[0].y !== snake[1].y - 1) {
                snake[0].y += 1;
            }
        });
    </script>
</body>
</html>