HTML5 Canvas贪吃蛇网页游戏特效代码



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特效描述:HTML5 Canvas 贪吃蛇 网页游戏。HTML5 Canvas贪吃蛇网页游戏特效代码

代码结构

1. HTML代码

<header class="wrap">
    <h1>Snake</h1>
    <p class="score">Score: <span id="score_value">0</span></p>
</header>
<canvas class="wrap" id="snake" width="320" height="320" tabindex="1"></canvas>
<!-- Game Over Screen -->
<div id="gameover">
    <h2>Game Over</h2>
    <p>press <span style="background-color: #FFFFFF; color: #000000">space</span> to begin a</p>
    <a id="newgame_gameover">new game</a>
    <a id="setting_gameover">settings</a>
</div>
<!-- Setting screen -->
<div id="setting">
    <h2>Settings</h2>
    <a id="newgame_setting">new game</a>
    <p>Speed:
        <input id="speed1" type="radio" name="speed" value="120" checked/>
        <label for="speed1">Slow</label>
        <input id="speed2" type="radio" name="speed" value="75" />
        <label for="speed2">Normal</label>
        <input id="speed3" type="radio" name="speed" value="35" />
        <label for="speed3">Fast</label>
    </p>
    <p>Wall:
        <input id="wallon" type="radio" name="wall" value="1" checked/>
        <label for="wallon">On</label>
        <input id="walloff" type="radio" name="wall" value="0" />
        <label for="walloff">Off</label>
    </p>
</div>
<!-- Main Menu Screen -->
<div id="menu">
    <h2>Snake</h2>
    <a id="newgame_menu">new game</a>
    <a id="setting_menu">settings</a>
</div>
<!--
     <div id="debug" style="font-size: 16px; color: #FFF;"></div>
  --><script>
(function() {
    /////////////////////////////////////////////////////////////
    // Canvas & Context
    var canvas;
    var ctx;
    // Snake
    var snake;
    var snake_dir;
    var snake_next_dir;
    var snake_speed;
    // Food
    var food = {
        x: 0,
        y: 0
    };
    // Score
    var score;
    // Wall
    var wall;
    // HTML Elements
    var screen_snake;
    var screen_menu;
    var screen_setting;
    var screen_gameover;
    var button_newgame_menu;
    var button_newgame_setting;
    var button_newgame_gameover;
    var button_setting_menu;
    var button_setting_gameover;
    var ele_score;
    var speed_setting;
    var wall_setting;
    /////////////////////////////////////////////////////////////
    var activeDot = function(x, y) {
        ctx.fillStyle = "#FFFFFF";
        ctx.fillRect(x * 10, y * 10, 10, 10);
    }
    /////////////////////////////////////////////////////////////
    var changeDir = function(key) {
        if (key == 38 && snake_dir != 2) {
            snake_next_dir = 0;
        } else {
            if (key == 39 && snake_dir != 3) {
                snake_next_dir = 1;
            } else {
                if (key == 40 && snake_dir != 0) {
                    snake_next_dir = 2;
                } else {
                    if (key == 37 && snake_dir != 1) {
                        snake_next_dir = 3;
                    }
                }
            }
        }
    }
    /////////////////////////////////////////////////////////////
    var addFood = function() {
        food.x = Math.floor(Math.random() * ((canvas.width / 10) - 1));
        food.y = Math.floor(Math.random() * ((canvas.height / 10) - 1));
        for (var i = 0; i < snake.length; i++) {
            if (checkBlock(food.x, food.y, snake[i].x, snake[i].y)) {
                addFood();
            }
        }
    }
    /////////////////////////////////////////////////////////////
    var checkBlock = function(x, y, _x, _y) {
        return (x == _x && y == _y) ? true : false;
    }
    /////////////////////////////////////////////////////////////
    var altScore = function(score_val) {
        ele_score.innerHTML = String(score_val);
    }
    /////////////////////////////////////////////////////////////
    var mainLoop = function() {
        var _x = snake[0].x;
        var _y = snake[0].y;
        snake_dir = snake_next_dir;
        // 0 - Up, 1 - Right, 2 - Down, 3 - Left
        switch (snake_dir) {
            case 0:
                _y--;
                break;
            case 1:
                _x++;
                break;
            case 2:
                _y++;
                break;
            case 3:
                _x--;
                break;
        }
        snake.pop();
        snake.unshift({
            x: _x,
            y: _y
        });
        // --------------------
        // Wall
        if (wall == 1) {
            // On
            if (snake[0].x < 0 || snake[0].x == canvas.width / 10 || snake[0].y < 0 || snake[0].y == canvas.height / 10) {
                showScreen(3);
                return;
            }
        } else {
            // Off
            for (var i = 0, x = snake.length; i < x; i++) {
                if (snake[i].x < 0) {
                    snake[i].x = snake[i].x + (canvas.width / 10);
                }
                if (snake[i].x == canvas.width / 10) {
                    snake[i].x = snake[i].x - (canvas.width / 10);
                }
                if (snake[i].y < 0) {
                    snake[i].y = snake[i].y + (canvas.height / 10);
                }
                if (snake[i].y == canvas.height / 10) {
                    snake[i].y = snake[i].y - (canvas.height / 10);
                }
            }
        }
        // --------------------
        // Autophagy death
        for (var i = 1; i < snake.length; i++) {
            if (snake[0].x == snake[i].x && snake[0].y == snake[i].y) {
                showScreen(3);
                return;
            }
        }
        // --------------------
        // Eat Food
        if (checkBlock(snake[0].x, snake[0].y, food.x, food.y)) {
            snake[snake.length] = {
                x: snake[0].x,
                y: snake[0].y
            };
            score += 1;
            altScore(score);
            addFood();
            activeDot(food.x, food.y);
        }
        // --------------------
        ctx.beginPath();
        ctx.fillStyle = "#000000";
        ctx.fillRect(0, 0, canvas.width, canvas.height);
        // --------------------
        for (var i = 0; i < snake.length; i++) {
            activeDot(snake[i].x, snake[i].y);
        }
        // --------------------
        activeDot(food.x, food.y);
        // Debug
        //document.getElementById("debug").innerHTML = snake_dir + " " + snake_next_dir + " " + snake[0].x + " " + snake[0].y;		
        setTimeout(mainLoop, snake_speed);
    }
    /////////////////////////////////////////////////////////////
    var newGame = function() {
        showScreen(0);
        screen_snake.focus();
        snake = [];
        for (var i = 4; i >= 0; i--) {
            snake.push({
                x: i,
                y: 15
            });
        }
        snake_next_dir = 1;
        score = 0;
        altScore(score);
        addFood();
        canvas.onkeydown = function(evt) {
            evt = evt || window.event;
            changeDir(evt.keyCode);
        }
        mainLoop();
    }
    /////////////////////////////////////////////////////////////
    // Change the snake speed...
    // 150 = slow
    // 100 = normal
    // 50 = fast
    var setSnakeSpeed = function(speed_value) {
        snake_speed = speed_value;
    }
    /////////////////////////////////////////////////////////////
    var setWall = function(wall_value) {
        wall = wall_value;
        if (wall == 0) {
            screen_snake.style.borderColor = "#606060";
        }
        if (wall == 1) {
            screen_snake.style.borderColor = "#FFFFFF";
        }
    }
    /////////////////////////////////////////////////////////////
    // 0 for the game
    // 1 for the main menu
    // 2 for the settings screen
    // 3 for the game over screen
    var showScreen = function(screen_opt) {
        switch (screen_opt) {
            case 0:
                screen_snake.style.display = "block";
                screen_menu.style.display = "none";
                screen_setting.style.display = "none";
                screen_gameover.style.display = "none";
                break;
            case 1:
                screen_snake.style.display = "none";
                screen_menu.style.display = "block";
                screen_setting.style.display = "none";
                screen_gameover.style.display = "none";
                break;
            case 2:
                screen_snake.style.display = "none";
                screen_menu.style.display = "none";
                screen_setting.style.display = "block";
                screen_gameover.style.display = "none";
                break;
            case 3:
                screen_snake.style.display = "none";
                screen_menu.style.display = "none";
                screen_setting.style.display = "none";
                screen_gameover.style.display = "block";
                break;
        }
    }
    /////////////////////////////////////////////////////////////
    window.onload = function() {
        canvas = document.getElementById("snake");
        ctx = canvas.getContext("2d");
        // Screens
        screen_snake = document.getElementById("snake");
        screen_menu = document.getElementById("menu");
        screen_gameover = document.getElementById("gameover");
        screen_setting = document.getElementById("setting");
        // Buttons
        button_newgame_menu = document.getElementById("newgame_menu");
        button_newgame_setting = document.getElementById("newgame_setting");
        button_newgame_gameover = document.getElementById("newgame_gameover");
        button_setting_menu = document.getElementById("setting_menu");
        button_setting_gameover = document.getElementById("setting_gameover");
        // etc
        ele_score = document.getElementById("score_value");
        speed_setting = document.getElementsByName("speed");
        wall_setting = document.getElementsByName("wall");
        // --------------------
        button_newgame_menu.onclick = function() {
            newGame();
        };
        button_newgame_gameover.onclick = function() {
            newGame();
        };
        button_newgame_setting.onclick = function() {
            newGame();
        };
        button_setting_menu.onclick = function() {
            showScreen(2);
        };
        button_setting_gameover.onclick = function() {
            showScreen(2)
        };
        setSnakeSpeed(150);
        setWall(1);
        showScreen("menu");
        // --------------------
        // Settings
        // speed
        for (var i = 0; i < speed_setting.length; i++) {
            speed_setting[i].addEventListener("click", function() {
                for (var i = 0; i < speed_setting.length; i++) {
                    if (speed_setting[i].checked) {
                        setSnakeSpeed(speed_setting[i].value);
                    }
                }
            });
        }
        // wall
        for (var i = 0; i < wall_setting.length; i++) {
            wall_setting[i].addEventListener("click", function() {
                for (var i = 0; i < wall_setting.length; i++) {
                    if (wall_setting[i].checked) {
                        setWall(wall_setting[i].value);
                    }
                }
            });
        }
        document.onkeydown = function(evt) {
            if (screen_gameover.style.display == "block") {
                evt = evt || window.event;
                if (evt.keyCode == 32) {
                    newGame();
                }
            }
        }
    }
})();
</script>
<div style="text-align:center;margin:50px 0; font:normal 14px/24px 'MicroSoft YaHei';color:#ffffff">
</div>



用户评论
大牛,别默默的看了,快登录帮我点评一下吧!:)      登录 | 注册


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