试玩请点此下载并用浏览器打开index.html
这个游戏是弓箭射击敌人，用方向键移动人物，空格键发射箭枝。
图例：
代码：
<!DOCTYPE html>
<html lang="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<head>
<title>弓箭手打怪物 19.3.8 9:23 by:逆火狂飙 horn19782016@163.com</title>
<style>
#canvas{
background:#ffffff;
cursor:pointer;
margin-left:10px;
margin-top:10px;
-webkit-box-shadow:3px 3px 6px rgba(0,0,0,0.5);
-moz-box-shadow:3px 3px 6px rgba(0,0,0,0.5);
box-shadow:3px 3px 6px rgba(0,0,0,0.5);
}
#controls{
margin-top:10px;
margin-left:15px;
}
</style>
</head>
<body onload="init()">
<div id="controls">
<input id='animateBtn' type='button' value='开始'/>
</div>
<canvas id="canvas" width="160px" height="160px" >
出现文字表示你的浏览器不支持HTML5
</canvas>
</body>
</html>
<script type="text/javascript">
<!--
var paused=true;
animateBtn.onclick=function(e){
paused=! paused;
if(paused){
animateBtn.value="开始";
}else{
animateBtn.value="停止";
window.requestAnimationFrame(animate);
}
}
var BL=32;// Block length,边长
var ctx;// 绘图环境
var terrain;// 地形
var hero;// 英雄/主角
var arrows;// 箭矢数组
var monsterMng;// 怪物管理者
//------------------------------------
// 初始化函数
//------------------------------------
function init(){
// init Canvas
var canvas=document.getElementById('canvas');
canvas.width =40*BL;
canvas.height=18*BL;
ctx=canvas.getContext('2d');
terrain=new Terrain();
hero=new Hero();
arrows=new Array();
monsterMng=new MonsterMng();
// 响应键盘事件
canvas.addEventListener('keydown', doKeyDown, true);
canvas.focus();
window.addEventListener('keydown', doKeyDown, true);
};
//------------------------------------
// 响应键盘事件
//------------------------------------
function doKeyDown(e) {
var keyID = e.keyCode ? e.keyCode :e.which;
if(keyID === 38 || keyID === 87) { // up arrow and W
hero.move('up');
e.preventDefault();
}
if(keyID === 39 || keyID === 68) { // right arrow and D
hero.move('right');
e.preventDefault();
}
if(keyID === 40 || keyID === 83) { // down arrow and S
hero.move('down');
e.preventDefault();
}
if(keyID === 37 || keyID === 65) { // left arrow and A
hero.move('left');
e.preventDefault();
}
if(keyID === 32 ) { // SpaceBar
var a=new Arrow(hero.x+BL/2,hero.y+BL/2,hero.direction);
arrows.push(a);
//console.log('arrows.length='+arrows.length);
e.preventDefault();
}
}
//------------------------------------
// 更新各实例状态
//------------------------------------
function update(){
for(var i=arrows.length-1;i>-1;i--){
var arrow=arrows[i];
var x=parseInt(arrow.x / 32,10);
var y=parseInt(arrow.y / 32,10);
// 箭矢射中怪物所在
if(monsterMng.shoot(x,y)==true){
//monsterMng.setValue(x,y,2);
arrows.splice(i,1);
break;
}
// 箭矢射中树木房屋等障碍物
if(terrain.getValue(x,y)!=0){
arrows.splice(i,1);
}
}
var heroX=parseInt(hero.x/BL,10);
var heroY=parseInt(hero.y/BL,10);
// 看英雄碰到怪物没
if(monsterMng.isTouched(heroX,heroY)){
hero.setDead();
}
// 游戏结束条件
if(hero.alive==false){ // 英雄死亡
alert("You lost!");
init();
}
if(monsterMng.noMonster()){ // 怪物全清除
alert("You Win!");
init();
}
}
//------------------------------------
// 在ctx里画出各实例
//------------------------------------
function draw(){
// Clear Canvas
ctx.clearRect(0,0,ctx.canvas.width,ctx.canvas.height);
ctx.fillStyle="#ffffff";
ctx.fillRect(0,0,ctx.canvas.width,ctx.canvas.height);
terrain.paint(ctx); // 画地形
// 画怪物
monsterMng.paint(ctx);
// 画箭矢
for(var i=0;i<arrows.length;i++){
var arrow=arrows[i];
arrow.paint(ctx);
}
hero.paint(ctx); // 画英雄
}
//------------------------------------
// 运行动画
//------------------------------------
function animate(){
if(!paused){
update();
draw();
window.requestAnimationFrame(animate); /// 让浏览器自行决定帧速率
}
}
//------------------------------------
// 常规函数:角度得到弧度
//------------------------------------
function getRad(degree){
return degree/180*Math.PI;
}
//------------------------------------
//生成从minNum到maxNum的随机数
//------------------------------------
function randomNum(minNum,maxNum){
switch(arguments.length){
case 1:
return parseInt(Math.random()*minNum+1,10);
break;
case 2:
return parseInt(Math.random()*(maxNum-minNum+1)+minNum,10);
break;
default:
return 0;
break;
}
}
//---------------------------------------------------地形类定义开始------------------------------------------------------------------->>
Terrain=function(){
this.files=["road.png", // 0
"tree.png", // 1
"farmerHouse.png", // 2
"twoBuilding.png", // 3
"threeBuilding.png",// 4
"bank.png", // 5
"villa.png",]; // 6
/*this.maps=new Array(
[0,0,0,0,0],
[0,0,1,0,0],
[0,0,0,0,0],
[0,2,0,0,0],
[0,0,0,3,0],
);*/
this.maps=new Array(
[1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,],
[0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,],
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],
[0,0,2,2,2,2,2,2,2,0,0,0,0,0,0,0,0,0,],
[0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,],
[0,0,0,2,0,0,2,0,0,0,0,0,0,3,0,0,0,0,],
[0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],
[0,2,2,2,2,2,2,2,4,0,0,0,0,0,0,0,0,0,],
[0,0,0,0,0,0,0,0,0,0,5,0,0,6,6,0,0,0,],
[0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,],
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],
[0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,],
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],
[0,0,2,2,2,2,2,2,2,0,0,1,0,0,0,0,3,0,],
[0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,3,0,],
[0,0,0,2,0,0,2,0,0,0,0,0,0,3,0,0,3,0,],
[0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],
[0,2,2,2,2,2,2,2,4,0,0,0,0,0,0,0,4,0,],
[0,0,0,0,0,0,0,0,0,0,5,0,0,6,6,0,4,0,],
[0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,4,0,],
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],
[0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,5,0,],
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,],
[0,0,2,2,2,2,2,2,2,0,0,0,0,0,0,0,5,0,],
[0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,],
[0,0,0,2,0,0,2,0,0,0,0,0,2,3,0,0,6,0,],
[0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,6,0,],
[0,2,2,2,2,2,2,2,4,0,0,0,0,0,0,0,6,0,],
[0,0,0,0,0,0,0,0,0,0,5,0,0,6,6,0,0,0,],
[0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,],
[0,0,0,0,0,0,0,0,0,0,0,0,5,0,0,0,0,0,],
[0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,],
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],
[0,0,2,2,2,2,2,2,2,0,0,0,0,0,0,0,0,0,],
[0,0,0,0,0,0,2,0,0,0,4,0,0,0,0,0,0,0,],
[0,0,0,2,0,0,2,0,0,0,0,0,0,3,0,0,0,0,],
[0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],
[0,2,2,2,2,2,2,2,4,0,0,0,0,0,0,0,0,0,],
[0,0,0,0,0,0,0,0,0,0,5,0,0,6,6,0,0,0,],
[0,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,],
);
}
Terrain.prototype={
files:[],
maps:[],
// 在ctx画自己
paint:function(ctx){
for(var i=0;i<this.maps.length;i++){
var arr=this.maps[i];
for(var j=0;j<arr.length;j++){
var value=arr[j];
var img=new Image();
img.src=this.files[value];
ctx.drawImage(img,i*BL,j*BL);
}
}
},
// 是否有障碍
hasObstacle:function(i,j){
if(i<0 || i>=this.maps.length){
return true;
}
var arr=this.maps[i];
if(j<0 || j>=arr.length){
return true;
}
var value=arr[j];
if(value==0){
return false;
}else{
return true;
}
},
// 取值
getValue:function(i,j){
if(i<0 || i>=this.maps.length){
return undefined;
}
var arr=this.maps[i];
if(j<0 || j>=arr.length){
return undefined;
}
var value=arr[j];
return value;
},
// 设值
setValue:function(i,j,value){
if(i<0 || i>=this.maps.length){
return undefined;
}
var arr=this.maps[i];
if(j<0 || j>=arr.length){
return undefined;
}
arr[j]=value;
},
}
//---------------------------------------------------地形类定义结束-------------------------------------------------------------------<<
//---------------------------------------------------英雄类定义开始------------------------------------------------------------------->>
Hero=function(){
this.pngs=[
{left:0,top:10,width:40,height:40},
{left:0,top:68,width:40,height:40},
{left:0,top:123,width:40,height:40},
{left:0,top:180,width:40,height:40},
];
}
Hero.prototype={
pngs:[],
x:160,
y:160,
xTo:160,
yTo:160,
step:32,
direction:'up',
alive:true,
setDead:function(){
//console.log('Hero dead');
this.alive=false;
},
paint:function(ctx){
if(this.alive){
var img=new Image();
img.src='bowman.png';
var index=0;
if(this.direction=='up'){
index=3;
}
if(this.direction=='down'){
index=0;
}
if(this.direction=='left'){
index=1;
}
if(this.direction=='right'){
index=2;
}
var pos=this.pngs[index];
ctx.drawImage(img,pos.left,pos.top,pos.width,pos.height,this.x,this.y,32,32);
}else{
var img=new Image();
img.src='skull.png';
ctx.drawImage(img,this.x,this.y);
}
},
move:function(direction){
if(this.alive){
this.direction=direction;
if(this.direction=='up'){
this.yTo-=this.step;
}
if(this.direction=='down'){
this.yTo+=this.step;
}
if(this.direction=='left'){
this.xTo-=this.step;
}
if(this.direction=='right'){
this.xTo+=this.step;
}
if(terrain.getValue(this.xTo/this.step,this.yTo/this.step)==0){
this.x=this.xTo;
this.y=this.yTo;
}else{
this.xTo=this.x;
this.yTo=this.y;
}
}
}
}
//---------------------------------------------------英雄类定义结束-------------------------------------------------------------------<<
//---------------------------------------------------怪物类定义开始------------------------------------------------------------------->>
Monster=function(x,y,step,direction){
this.x=x;
this.y=y;
this.step=step;
this.direction=direction;
this.files=["monster.png", // 0
"monsterDead.png", // 1
"monsterUpdated.png", // 2
"monsterUpdatedDead.png",]; // 3
}
Monster.prototype={
x:0, // 横坐标，乘以32等于真正的横坐标
y:0, // 纵坐标，乘以32等于真正的纵坐标
step:1, // 行走速度
direction:'', // 方向
files:[], // 显示图片
alive:true, // 是否活着
// 步长加倍
doubleStep:function(){
this.step*=2;
},
// 被射中了
beShooted:function(){
this.alive=false;
},
// 移动
move:function(){
if(this.alive){
}
},
turnAround:function(){
var arr=['left','right','up','down',];
var newArr=[];
for(var i=0;i<arr.length;i++){
if(this.direction!=arr[i]){
newArr.push(arr[i]);
}
}
console.log("newArr="+newArr);
var index=randomNum(0,newArr.length-1);
console.log("index="+index);
this.direction=newArr[index];
},
paint:function(ctx){
var img=new Image();
if(this.alive==true && this.step==1){
img.src=this.files[0];
}
if(this.alive==false && this.step==1){
img.src=this.files[1];
}
if(this.alive==true && this.step==2){
img.src=this.files[2];
}
if(this.alive==false && this.step==2){
img.src=this.files[3];
}
ctx.drawImage(img,this.x,this.y);
},
}
//---------------------------------------------------怪物类定义结束-------------------------------------------------------------------<<
//---------------------------------------------------怪物管理类定义开始------------------------------------------------------------------->>
MonsterMng=function(){
this.generateMonsters();
}
MonsterMng.prototype={
monsters:[],
// 生成怪物
generateMonsters:function(){
this.monsters=new Array();
this.monsters.push(new Monster(1*BL,1*BL,1,"right"));
this.monsters.push(new Monster(1*BL,10*BL,1,"right"));
this.monsters.push(new Monster(16*BL,16*BL,1,"right"));
this.monsters.push(new Monster(10*BL,13*BL,1,"right"));
this.monsters.push(new Monster(10*BL,10*BL,1,"right"));
},
// 画怪物
paint:function(ctx){
for(var i=0;i<this.monsters.length;i++){
var m=this.monsters[i];
m.paint(ctx);
}
},
// 判断怪物还是否存在
hasMonster:function(){
return true;
},
// 用箭射击怪物
shoot:function(arrowX,arrowY){
for(var i=0;i<this.monsters.length;i++){
var monster=this.monsters[i];
// 变量名不宜太短，词必答意
var monsterX=parseInt(monster.x/BL,10);
var monsterY=parseInt(monster.y/BL,10);
//console.log(arrowX,arrowY,monsterX,monsterY);
if(monsterX==arrowX && monsterY==arrowY && monster.alive==true){
monster.beShooted();
//console.log('shooted',arrowX,arrowY,monsterX,monsterY);
return true;
}
}
return false;
},
// 看英雄是否碰到怪物
isTouched:function(heroX,heroY){
for(var i=0;i<this.monsters.length;i++){
var monster=this.monsters[i];
var monsterX=parseInt(monster.x/BL,10);
var monsterY=parseInt(monster.y/BL,10);
console.log('isTouched',heroX,heroY,monsterX,monsterY);
if(heroX==monsterX && heroY==monsterY && monster.alive==true){
console.log('touched',heroX,heroY,monsterX,monsterY);
return true;
}
}
return false;
},
// 看有没有怪物了
noMonster:function(heroX,heroY){
var count=0;
for(var i=0;i<this.monsters.length;i++){
var monster=this.monsters[i];
if(monster.alive){
count++;
}
}
return count==0;
},
}
//---------------------------------------------------怪物管理类定义结束-------------------------------------------------------------------<<
//---------------------------------------------------箭矢类定义开始------------------------------------------------------------------->>
Arrow=function(x,y,direction){
this.x=x;
this.y=y;
this.direction=direction;
}
Arrow.prototype={
x:0,
y:0,
velocity:1,// 飞行速度
len:16,// 箭杆长
direction:'',
// method
paint:function(ctx){
var x1=this.x,y1=this.y;
var leaf=4;//箭头箭羽长
var x2,y2,x3,y3;
var angle=getRad(15);
if(this.direction=='up'){
this.y-=this.velocity;
y1=this.y-this.len;
x1=this.x;
y2=y1+leaf*Math.cos(angle);
x2=x1-leaf*Math.sin(angle);
y3=y2;
x3=x1+leaf*Math.sin(angle);
}
if(this.direction=='down'){
this.y+=this.velocity;
y1=this.y+this.len;
x1=this.x;
y2=y1-leaf*Math.cos(angle);
x2=x1-leaf*Math.sin(angle);
y3=y2;
x3=x1+leaf*Math.sin(angle);
}
if(this.direction=='left'){
this.x-=this.velocity;
x1=this.x-this.len;
y1=this.y;
x2=x1+leaf*Math.cos(angle);
y2=y1-leaf*Math.sin(angle);
x3=x2;
y3=y1+leaf*Math.sin(angle);
}
if(this.direction=='right'){
this.x+=this.velocity;
x1=this.x+this.len;
y1=this.y;
x2=x1-leaf*Math.cos(angle);
y2=y1-leaf*Math.sin(angle);
x3=x2;
y3=y1+leaf*Math.sin(angle);
}
ctx.beginPath();
ctx.lineWidth = 2;
ctx.strokeStyle = "#ff0000";
ctx.lineTo(this.x,this.y);
ctx.lineTo(x1,y1);
ctx.lineTo(x2,y2);
ctx.lineTo(x3,y3);
ctx.lineTo(x1,y1);
ctx.stroke();
ctx.closePath();
},
}
//---------------------------------------------------箭矢类定义结束-------------------------------------------------------------------<<
//-->
</script>
2019年3月8日12点32分