期中HTML代码及技术博客

  <!DOCTYPE html>
  <html lang="en">
  <head>
  <meta charset="UTF-8">
  <title>贪吃蛇</title>
  <style type="text/css">
  *{margin:0;padding: 0;font-family: "Microsoft YaHei";}
  #page{margin-right: auto;margin-left: auto; margin-top: 20px;height: 600px; width: 980px; }
  #yard{ width: 800px;border: 1px solid gray;box-shadow: 0 0 10px black; float: right;}
  #mark{font-weight: 800;}
  #mark_con{ color: red; }
  button{width: 50px; }
  a{text-decoration:none;}
  </style>
  <script type="text/javascript">
  //伪常量
  var BLOCK_SIZE = 20; //格子大小
  var COLS = 40; //列数
  var ROWS = 30; //行数
  //变量
  var snakes = []; //保存蛇坐标
  var c = null; //绘图对象
  var toGo = 3; //行进方向
  var snakecount = 4; //蛇身数量
  var interval = null; //计时器
  var foodX = 0; //食物X轴坐标
  var foodY = 0; //食物Y轴坐标
  var oMark = null; //分数显示框
  var isPause = false; //是否暂停
  // 绘图函数
  function draw(){
  c.clearRect(0,0,BLOCK_SIZE * COLS, BLOCK_SIZE * ROWS);
  //画出横线
  for( var i = 1; i <= ROWS; i++ ) {
  c.beginPath();
  c.moveTo(0, i * BLOCK_SIZE);
  c.lineTo(BLOCK_SIZE * COLS, i * BLOCK_SIZE);
  c.strokeStyle = "gray";
  c.stroke();
  }
  //画出竖线
  for(var i = 1; i <= COLS; i++){
  c.beginPath();
  c.moveTo(i * BLOCK_SIZE, 0);
  c.lineTo(i * BLOCK_SIZE, BLOCK_SIZE * ROWS);
  c.stroke();
  }
  //画出蛇
  for (var i = 0; i < snakes.length; i++){
  c.beginPath();
  c.fillStyle = "green";
  c.fillRect(snakes[i].x, snakes[i].y, BLOCK_SIZE, BLOCK_SIZE);
  c.moveTo(snakes[i].x, snakes[i].y);
  c.lineTo(snakes[i].x + BLOCK_SIZE, snakes[i].y);
  c.lineTo(snakes[i].x + BLOCK_SIZE, snakes[i].y + BLOCK_SIZE);
  c.lineTo(snakes[i].x, snakes[i].y + BLOCK_SIZE);
  c.closePath();
  c.strokeStyle = "white";
  c.stroke();
  }
  //画出食物
  c.beginPath();
  c.fillStyle = "yellow";
  c.fillRect(foodX, foodY, BLOCK_SIZE, BLOCK_SIZE);
  c.moveTo(foodX, foodY);
  c.lineTo(foodX + BLOCK_SIZE, foodY);
  c.lineTo(foodX + BLOCK_SIZE, foodY + BLOCK_SIZE);
  c.lineTo(foodX, foodY + BLOCK_SIZE);
  c.closePath();
  c.strokeStyle = "red";
  c.stroke();
  }
  //游戏初始化
  function start(){
  for( var i = 0; i < snakecount; i++){
  snakes[i] = {x: i * BLOCK_SIZE, y: 0};
  }
  addFood();
  draw();
  oMark.innerHTML = 0;
  }
  //移动函数
  function move(){
  switch(toGo){
  case 1: //左边
  snakes.push({x: snakes[snakecount - 1].x - BLOCK_SIZE, y: snakes[snakecount - 1].y});
  break;
  case 2: //上边
  snakes.push({x: snakes[snakecount - 1].x, y: snakes[snakecount - 1].y - BLOCK_SIZE});
  break;
  case 3: //右边
  snakes.push({x: snakes[snakecount - 1].x + BLOCK_SIZE, y: snakes[snakecount - 1].y});
  break;
  case 4: //下边
  snakes.push({x: snakes[snakecount - 1].x, y: snakes[snakecount - 1].y + BLOCK_SIZE});
  break;
  default:;
  }
  snakes.shift();
  isEat();
  isDie();
  draw();
  }
  //吃到食物判断
  function isEat(){
  if (snakes[snakecount - 1].x == foodX && snakes[snakecount - 1].y == foodY) {
  oMark.innerHTML = (parseInt(oMark.innerHTML) + 1).toString();
  addFood();
  addSnake();
  }
  }
  //添加蛇身
  function addSnake(){
  snakecount++;
  snakes.unshift({x:BLOCK_SIZE * COLS, y:BLOCK_SIZE * ROWS});
  }
  //交互响应函数
  function keydown(keyCode){
  switch(keyCode){
  case 37: //左边
  if(toGo != 1 && toGo != 3) toGo = 1;break;
  case 38: //上边
  if(toGo != 2 && toGo != 4) toGo = 2;break;
  case 39: //右边
  if(toGo != 3 && toGo != 1) toGo = 3;break;
  case 40: //下的
  if(toGo != 4 && toGo != 2) toGo = 4;break;
  case 80: //开始/暂停
  if(isPause){
  interval = setInterval(move,100);
  isPause = false;
  document.getElementById('pause').innerHTML = "Pause";
  }else{
  clearInterval(interval);
  isPause = true;
  document.getElementById('pause').innerHTML = "Start";
  }
  break;
  }
  }
  //制造食物
  function addFood(){
  foodX = Math.floor(Math.random() * (COLS - 1)) * BLOCK_SIZE;
  foodY = Math.floor(Math.random() * (ROWS - 1)) * BLOCK_SIZE;
  // console.log(foodX + " -- " + foodY);
  }
  //死亡判断
  function isDie(){
  if(snakes[snakecount - 1].x == -20 || snakes[snakecount - 1].x == BLOCK_SIZE * COLS
  || snakes[snakecount - 1].y == -20 || snakes[snakecount - 1].y == BLOCK_SIZE * ROWS){
  alert("Game Over!");
  clearInterval(interval);
  }
  for(var i = 0; i < snakecount - 1; i++){
  if(snakes[snakecount - 1].x == snakes[i].x && snakes[snakecount - 1].y == snakes[i].y){
  clearInterval(interval);
  alert("Game Over!");
  }
  }
  }
  // 启动函数
  window.onload = function(){
  c = document.getElementById('canvas').getContext('2d');
  oMark = document.getElementById('mark_con');
  start();
  interval = setInterval(move,100);
  document.onkeydown = function(event){
  var event = event || window.event;
  keydown(event.keyCode);
  }
  }
  </script>
  </head>
  <body>
  <div id="page">
  <div id="yard"><canvas id="canvas" height="600px" width="800px"></canvas></div>
  <div id="help">
  <div id="mark">得分：<span id="mark_con"></span></div>
  <div id="helper">
  <table>
  <tr>
  <td></td>
  <td><button onclick="keydown(38);">上</button></td>
  <td></td>
  </tr>
  <tr>
  <td><button onclick="keydown(37);">左</button></td>
  <td><button onclick="keydown(80);" id="pause">暂停</button></td>
  <td><button onclick="keydown(39);">右</button></td>
  </tr>
  <tr>
  <td></td>
  <td><button onclick="keydown(40);">下</button></td>
  <td></td>
  </tr>
  </table><a href="index.html">再玩一次</a>
  </div>
  </div>
  </div>
   
   
  </div>
   
   
  </body>
  </html>

posted on 2016-04-21 21:36  oOoooOoOoOOO  阅读(219)  评论(0)  编辑  收藏  举报