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发表时间：2011-09-23
下面是一个使用canvas API加JS面向对象的方式编写的一个贪吃蛇的简单实现，实现了穿墙、吃食物后智能加速，还缺少障碍物，地图切换，还有就是太丑了，有兴趣的朋友可以修改一下，我觉得这个还算好扩展，特地贴出来大家讨论研究，算法我写得差劲，权当抛砖引玉之用。 <!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Asphyre</title>
<script>
var AsphyreNode = function(x, y, w, h){
this.x = x;
this.y = y;
this.w = w;
this.h = h;
this.equals = function(node) {
if(this.x === node.x && this.y === node.y)
return true;
return false;
}
};
function Asphyre(farm, x, y, speed, initNodes){ //对贪吃蛇的描述，相当于实现一个蛇类
var self = this;
this.perform = null; //定时器引用
this.speed = speed;
this.speedParam = speed * initNodes; //蛇移动的速度
this.nodeSize = 10; //蛇每一节的大小
this.nodes = []; //节点数
this.initNodes = initNodes;
this.farm = farm;
this.x = x;
this.y = y;
this.direction = 10; //表示向右,初始方向
this.left = -10,this.right = 10;
this.down = 1, this.up = -1;
document.onkeypress = function(event) {
event = event || window.event;
var code = event.keyCode || event.charCode();
var isException = false;
switch(code) {
case 37: //向左
if(self.direction + self.left){
self.direction = self.left;
} else isException = true;
break;
case 38: //向上
if(self.direction + self.up){
self.direction = self.up;
} else isException = true;
break;
case 39: //向右
if(self.direction + self.right){
self.direction = self.right;
} else isException = true;
break;
case 40: //向下
if(self.direction + self.down){
self.direction = self.down;
} else isException = true;
break;
}
if(isException){
alert("方向异常，不能沿反方向后退!");
}
}
};
Asphyre.prototype = {
init: function(){
var self = this, farm = this.farm, x = this.x, y = this.y;
this.nodes = [];
for(var i = 0; i < this.initNodes; i ++) {
this.nodes[i] = new AsphyreNode(this.x - i * 10, this.y, this.nodeSize, this.nodeSize);
}
this.farm.food = this.farm.newFood(this);
this.farm.repaint(this);
},
drawNodes: function(context){ //绘制设身体
var self = this;
context.fillStyle = "#000000";
context.strokeStyle = "#ffffff";
for(var i = 0; i < this.nodes.length; i ++) {
context.fillRect(this.nodes[i].x, this.nodes[i].y, this.nodeSize, this.nodeSize);
context.strokeRect(this.nodes[i].x, this.nodes[i].y, this.nodeSize, this.nodeSize);
}
},
eatFood: function() {//吃食物
var self = this;
self.nodes.unshift(self.farm.food);
self.farm.food = self.farm.newFood(self);
self.refreshSpeed();
},
start: function(){//开始
var self = this;
self.init();
if(!self.perform)
self.perform = setInterval(self.go, self.speed, this);
},
continueRun: function(){ //继续
var self = this;
if(!self.perform)
self.perform = setInterval(self.go, self.speed, this);
},
stop: function(){//结束
var self = this;
if(!!self.perform)
clearInterval(self.perform);
self.perform = null;
self.farm.clear();
},
pause: function() { //暂停
var self = this;
if(!!self.perform)
clearInterval(self.perform);
self.perform = null;
},
go: function(param){//沿着当前方向前进
var self = param;
switch(self.direction) {
case -1: //上
if(self.nodes[0].equals(self.farm.food)) {//吃到食物，少走一步
self.farm.food.y -= self.nodeSize
self.eatFood();
self.farm.repaint(self);
return;
}
var varluable = self.nodes[0].y - self.nodeSize;
if(varluable < 0)
varluable = self.farm.farmElem.height - self.nodeSize
self.nodes.unshift(new AsphyreNode(self.nodes[0].x, varluable, self.nodeSize, self.nodeSize));
self.nodes.pop();
break;
case 1: //下
if(self.nodes[0].equals(self.farm.food)) {//吃到食物，少走一步
self.farm.food.y += self.nodeSize
self.eatFood();
self.farm.repaint(self);
return;
}
var varluable = self.nodes[0].y + self.nodeSize;
if(varluable > self.farm.farmElem.height - self.nodeSize)
varluable = 0;
self.nodes.unshift(new AsphyreNode(self.nodes[0].x, varluable, self.nodeSize, self.nodeSize));
self.nodes.pop();
break;
case -10: //左
if(self.nodes[0].equals(self.farm.food)) {//吃到食物，少走一步
self.farm.food.x -= self.nodeSize
self.eatFood();
self.farm.repaint(self);
return;
}
var varluable = self.nodes[0].x - self.nodeSize;
if(varluable < 0)
varluable = self.farm.farmElem.width - self.nodeSize;
self.nodes.unshift(new AsphyreNode(varluable, self.nodes[0].y, self.nodeSize, self.nodeSize));
self.nodes.pop();
break;
case 10: //右
if(self.nodes[0].equals(self.farm.food)) {//吃到食物，少走一步
self.farm.food.x += self.nodeSize
self.eatFood();
self.farm.repaint(self);
return;
}
var varluable = self.nodes[0].x + self.nodeSize;
if(varluable > self.farm.farmElem.width - self.nodeSize)
varluable = 0;
self.nodes.unshift(new AsphyreNode(varluable, self.nodes[0].y, self.nodeSize, self.nodeSize));
self.nodes.pop();
break;
}
self.farm.repaint(self);
for(var i = 1; i < self.nodes.length; i ++) {
if(self.nodes[0].equals(self.nodes[i])) {//吃到身体，死亡
self.die();
break;
}
}
},
refreshSpeed: function() { //吃到食物后调整速度的算法
var self = this;
this.speed = Math.round(this.speedParam / this.nodes.length);
self.stop();
self.continueRun();
},
die: function() { //蛇咬到自己死了
var self = this, context = this.farm.context;
self.pause();
document.getElementById("pause").disabled = true;
document.getElementById("continue").disabled = true;
document.getElementById("stop").disabled = true;
self.drawOver(context);
},
drawOver: function(context) {
context.save();
context.font="60px impact";
context.fillStyle="#000000";
context.textAlign="center";
context.fillText("GAME OVER!",250,250);
}
};
var Farm = function(farmId){ //对农场的描述，相当于实现农场类
this.farmElem = document.getElementById(farmId);
this.context = this.farmElem.getContext("2d");
this.food = null;
this.init();
};
Farm.prototype = {
init: function(){ //初始化农场
var self = this, farm = this.farmElem, context = this.context;
var w = farm.width,h = farm.height;
context.fillStyle = "#E8FFFF";
context.strokeStyle = "#000000";
context.fillRect(0, 0, w, h);
context.strokeRect(0, 0, w, h)
},
clear: function() { //清理农场
var self = this, farm = this.farmElem, context = this.context;
var w = farm.width,h = farm.height;
context.fillStyle = "#E8FFFF";
context.strokeStyle = "#000000";
context.fillRect(0, 0, w, h);
context.strokeRect(0, 0, w, h)
},
repaint: function(snake) { //重绘农场
var self = this;
self.clear();
self.drowFood(snake);
snake.drawNodes(snake.farm.context);
},
newFood: function(snake) { //农场为蛇生成食物
var x,y;
var flag = true;
k:
while(flag) {
x = Math.round(Math.random() * (this.farmElem.width-10) / 10) * 10;
y = Math.round(Math.random() * (this.farmElem.height-10) / 10) * 10;
for(var i = 0; i < snake.nodes.length; i ++) {
if(snake.nodes[i].x === x && snake.nodes[i].y === y){//食物在蛇的身体上
break k;
}
}
flag = false;
}
return new AsphyreNode(x, y, snake.nodeSize, snake.nodeSize);
},
drowFood: function() { //为毒蛇画饼
this.context.fillStyle = "#FEF045";
this.context.strokeStyle = "#ffffff";
this.context.fillRect(this.food.x, this.food.y, this.food.w, this.food.h);
this.context.strokeRect(this.food.x, this.food.y, this.food.w, this.food.h);
}
}
var Game = function(){ //主程序，用于启动游戏
this.snake = new Asphyre(new Farm("canvas"), 200, 200, 500, 5);
};
Game.prototype = {
start: function(){
this.snake.start();
},
stop: function() {
this.snake.stop();
},
pause: function() {
this.snake.pause();
},
continueRun: function() {
this.snake.continueRun();
}
}
</script>
</head>
<body>
<div id="wrapper" style="text-align: center;">
<canvas id="canvas" width="500"height="500"></canvas><br/>
<input type="button" value="新游戏" id="start"/>
<input type="button" value="继续" id="continue" disabled="true"/>
<input type="button" value="结束" id="stop" disabled="true"/>
<input type="button" value="暂停" id="pause" disabled="true"/>
</div>
<script>
var game = new Game();
document.getElementById("start").onclick = function(){
game.start();
document.getElementById("continue").disabled = true;
document.getElementById("pause").disabled = false;
document.getElementById("stop").disabled = false;
};
document.getElementById("stop").onclick = function(){
game.stop();
document.getElementById("start").disabled = false;
document.getElementById("pause").disabled = true;
document.getElementById("continue").disabled = true;
this.disabled = true;
};
document.getElementById("pause").onclick = function(){
game.pause();
document.getElementById("stop").disabled = true;
document.getElementById("continue").disabled = false;
document.getElementById("start").disabled = false;
this.disabled = true;
};
document.getElementById("continue").onclick = function(){
game.continueRun();
this.disabled = true;
document.getElementById("stop").disabled = false;
document.getElementById("start").disabled = false;
document.getElementById("pause").disabled = false;
};
</script>
</body>
</html>
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