如何将苹果变成绿色文本？

qpgpyjmq  于 2021-09-13  发布在  Java
关注(0)|答案(1)|浏览(323)

我从snake代码中得到了一个snake游戏——将蛇的脸变成一个图像，我想知道如何将苹果变成文本，字体与右上角的分数相同，并使用javascript识别的颜色变成绿色 LimeGreen ，或其十六进制等价物 #32CD32 .
以下是供您查看的连续html代码：

<!DOCTYPE html>
<html style="background-color: #000000">
<head>
  <title>Snake!</title>
</head>
<body>
<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 = "LimeGreen";
        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 j = 0, x = snake.length; j < x; j++) {
            if (snake[j].x < 0) {
              snake[j].x = snake[j].x + (canvas.width / 10);
            }
            if (snake[j].x == canvas.width / 10) {
              snake[j].x = snake[j].x - (canvas.width / 10);
            }
            if (snake[j].y < 0) {
              snake[j].y = snake[j].y + (canvas.height / 10);
            }
            if (snake[j].y == canvas.height / 10) {
              snake[j].y = snake[j].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>
<style>
    ::selection {
      color: #FFFFFF;
      background: transparent;
    }

     ::-moz-selection {
      color: #FFFFFF;
      background: transparent;
    }

    * {
      margin: 0;
      padding: 0;
      font-family: "VT323";
    }

    body {
      background-color: #000000;
    }

    .wrap {
      margin-left: auto;
      margin-right: auto;
    }

    header {
      width: 340px;
      font-size: 0;
    }

    canvas {
      display: none;
      border-style: solid;
      border-width: 10px;
      border-color: #FFFFFF;
    }

    canvas:focus {
      outline: none;
    }

    /* Top Styles */

    h1 {
      display: inline-block;
      width: 100px;
      font-size: 32px;
      color: #FFFFFF;
    }

    .score {
      display: inline-block;
      width: 240px;
      font-size: 20px;
      color: #FFFFFF;
      text-align: right;
    }

    .score_value {
      font-size: inherit;
    }

    /* All screens style */

    #gameover a,
    #setting a,
    #menu a {
      display: block;
    }

    #gameover a,
    #setting a:hover,
    #menu a:hover {
      cursor: pointer;
    }

    #gameover a:hover::before,
    #setting a:hover::before,
    #menu a:hover::before {
      content: ">";
      margin-right: 10px;
    }

    /* Menu Screen Style */

    #menu {
      display: block;
      width: 340px;
      padding-top: 95px;
      padding-bottom: 95px;
      font-size: 40px;
      margin-left: auto;
      margin-right: auto;
      text-align: center;
      color: #FFF;
    }

    #menu h2 {
      -webkit-animation: logo-ani 1000ms linear infinite;
      animation: logo-ani 1000ms linear infinite;
      margin-bottom: 30px;
    }

    #menu a {
      font-size: 30px;
    }

    @-webkit-keyframes logo-ani {
      50% {
        -webkit-transform: scale(1.3, 1.3);
      }
      100% {
        -webkit-transform: scale(1.0, 1.0);
      }
    }

    @keyframes logo-ani {
      50% {
        transform: scale(1.3, 1.3);
      }
      100% {
        transform: scale(1.0, 1.0);
      }
    }

    /* Game Over Screen Style */

    #gameover {
      display: none;
      width: 340px;
      padding-top: 95px;
      padding-bottom: 95px;
      margin-left: auto;
      margin-right: auto;
      text-align: center;
      font-size: 30px;
      color: #FFF;
    }

    #gameover p {
      margin-top: 25px;
      font-size: 20px;
    }

    /* Settings Screen Style */

    #setting {
      display: none;
      width: 340px;
      margin-left: auto;
      margin-right: auto;
      padding-top: 85px;
      padding-bottom: 85px;
      font-size: 30px;
      color: #FFF;
      text-align: center;
    }

    #setting h2 {
      margin-bottom: 15px;
    }

    #setting p {
      margin-top: 10px;
    }

    #setting input {
      display: none;
    }

    #setting label {
      cursor: pointer;
    }

    #setting input:checked+label {
      background-color: #FFF;
      color: #000;
    }
</style>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
    <link href="https://fonts.googleapis.com/css2?family=VT323&display=swap" rel="stylesheet">

    <header class="wrap">
      <h1>Snake</h1>
      <p class="score">Score: <span id="score_value">0</span></p>
    </header>

    <canvas class="wrap" id="snake" width="600" height="600" 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>
</body>
</html>

提前谢谢！

JavaScriptHtmlcss

1条答案

按热度按时间
jtjikinw

jtjikinw1#

向activedot添加第三个参数，传递颜色。

var activeDot = function(x, y, color) {
  ctx.fillStyle = color;
  ctx.fillRect(x * 10, y * 10, 10, 10);
}

它被用在三个地方， activeDot(food.x, food.y, 'LimeGreen');

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