JavaScript编写实现飞机大战
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本文实例为大家分享了JavaScript实现飞机大战的具体代码，供大家参考，具体内容如下
一.飞机大战游戏介绍：
游戏中，玩家驾驶飞机，在空中进行战斗。点击并移动自己的飞机，发射炮弹，打掉敌小型飞机、中型飞机和大型飞机，来获得分数和奖励，打掉一架小型飞机赢得3分，打掉一架中型飞机赢得5分，打掉一架大型飞机赢得10分，累加得分。撞到敌飞机命减1，当命数为0时，则游戏结束。
二. 效果图页面展示：
初始界面如图-1所示:
玩家在如图-1所示的界面的任意位置，按下鼠标左键，开始游戏。
图-1
默认分数为0，默认5条命，请看如图-2所示具体介绍：
图-2
在游戏进行过程中，鼠标离开游戏界面,游戏将进入暂停状态，界面效果如图-3所示：
图-3
当鼠标再次移入界面时，游戏将继续进行。
三. 完整代码如下：
画布样式：
<style>
canvas {
border: 1px solid #f8c1ab;
position: absolute;
left: 0;
right: 0;
margin: auto;
}
</style>设置画布，定义初始状态，准备阶段：
// 画布
var canvas = document.getElementById('canvas')
var ctx = canvas.getContext('2d');
// 存储画布宽高
var width = canvas.width;
var height = canvas.height;
var height = 852;
// 准备初始化
var ready = 0;
var loading = 1;
var running = 2;
var pause = 3;
var over = 4;
var life = 3;
var score = 0;
// 定义初始状态
var state = ready;
// 一. 准备阶段,在画布上以图片的形式画出背景图片
var bg = new Image();
bg.class="lazy" data-src = 'img/background.png';
// 1. 创建一个对象,用来存储当前图片绘制的等信息
var bgParam = {
bg: bg, //对象里的第一个参数为构建的image对象,.class="lazy" data-src属性存储了图片的信息
x: 0,
y: 0,
width: 480,
height: 852
}
// 2 .创建构造函数,调用函数时绘制这张图,将图片绘制的信息传递给这个函数时,根据传递的信息绘制出图片
function bgPaint(param) {
this.bg = param.bg;
this.x = param.x;
this.y = param.y;
this.width = param.width;
this.height = param.height;
// 两张图片交替绘制,实现滚动效果
this.y1 = -this.height;
// 绘制图片
this.draw = function () {
ctx.drawImage(this.bg, this.x, this.y, this.width, this.height)
ctx.drawImage(this.bg, this.x, this.y1, this.width, this.height)
}
// 让图片不断下移,实现动态滚动效果
this.scroll = function () {
this.y += 7;
this.y1 += 7;
// 每张图片到达底部后重新回到上面
if (this.y >= this.height) {
this.y = -this.height
}
if (this.y1 >= this.height) {
this.y1 = -this.height
}
}
}
// 创建背景图片对象
var bgObj = new bgPaint(bgParam);绘制游戏开始前：
// 二. 绘制游戏开始前logo
var logo = new Image();
logo.class="lazy" data-src = 'img/start.png'
var logoParam = {
logo: logo,
x: 0,
y: 0,
width: 480,
height: 852
}
function logoPaint(param) {
this.logo = param.logo;
this.x = param.x;
this.y = param.y;
this.width = param.width;
this.height = param.height;
this.draw = function () {
ctx.drawImage(this.logo, this.x, this.y, this.width, this.height)
}
}
var logoObj = new logoPaint(logoParam);
// 点击后改变游戏状态
canvas.addEventListener('click',function () {
if (state == ready) {
state = loading;
}else if (state == loading){
state = pause;
}else if (state == running){
state = pause;
}else if (state == pause){
if(state != over){
state = running;
console.log(22);
}
}
})
canvas.addEventListener('mouseleave',function(){
if(state == loading){
state = pause;
}else if (state == running){
state = pause;
}
})游戏加载阶段：
// 三. 游戏加载阶段
// 定义数组存放图片的信息
var imgArr = ['img/game_loading1.png', 'img/game_loading2.png', 'img/game_loading3.png',
'img/game_loading4.png']
var loadingImg = [];
for (var i = 0; i < imgArr.length; i++) {
loadingImg[i] = new Image();
loadingImg[i].class="lazy" data-src = imgArr[i]
}
var loadingParam = {
loadingImg: loadingImg, //第一个参数为一个数组,数组里存放了一系列new Image()所new出来的图片对象,图片对象.class="lazy" data-src为地址
width: 186,
height: 38
}
function loadingPaint(param) {
this.loadingImg = param.loadingImg;
this.width = param.width;
this.height = param.height;
this.x = 0;
this.y = height - param.height;
// 定义绘制的下标
this.index = 0;
this.times = 0;
// 绘制图片
this.draw = function () {
ctx.drawImage(this.loadingImg[this.index], this.x, this.y, this.width, this.height)
}
// 每隔一段时间通过改变下标来改变图片以使图片动起来
this.sport = function () {
// 定时器累计一定次数后才改变下一张图片,避免加载图片更换太快
this.times++;
if (this.times % 2 == 0) {
this.index++;
if (this.index == this.loadingImg.length) {
// 绘制完加载图片后,改变游戏状态
state = running;
}
}
}
}
// 在绘制完加载图片后自动更换了游戏运行状态
var loadingObj = new loadingPaint(loadingParam);游戏进行阶段：
// 四. 游戏进行阶段
// 绘制我方飞机
var heroArr = ['img/hero1.png', 'img/hero2.png', 'img/hero_blowup_n1.png', 'img/hero_blowup_n2.png',
'img/hero_blowup_n3.png', 'img/hero_blowup_n4.png'
]
var heroPlane = [];
for (var i = 0; i < heroArr.length; i++) {
heroPlane[i] = new Image();
heroPlane[i].class="lazy" data-src = heroArr[i]
}
// 定义飞机的图像信息
var heroParam = {
heroPlane: heroPlane,
width: 99,
height: 124,
life:5
}
var flag = true;
function heroPaint(param) {
this.heroPlane = param.heroPlane;
this.width = param.width;
this.height = param.height;
this.life = param.life;
flag = false;
this.x = width / 2 - this.width / 2;
this.y = height - this.height;
// 存储切换图片的下标
this.index = 0;
// 判断是否被撞击
this.down = false;
// 切换频率
this.times = 0;
// 绘制hero函数
this.draw = function () {
ctx.drawImage(this.heroPlane[this.index], this.x, this.y, this.width, this.height)
}
// 判断飞机是否被撞击以及被撞击后的状态改变
this.sport = function () {
// 没有被撞击时飞机的状态只会在hero1和hero2之间切换
if (!this.down) {
if (this.index == 0) {
this.index = 1;
} else {
this.index = 0;
}
} else {
// 被撞击后状态的改变加上爆炸的样子
this.index++;
if (this.index == this.heroPlane.length) {
// 游戏结束后飞机停留在冒烟状态
this.index = this.heroPlane.length - 1;
heroParam.life--;
if (heroParam.life <= 0) {
state = over;
} else {
// 还有生命值时重新开始游戏
heroObj = new heroPaint(heroParam)
}
}
}
}
this.shoot = function () {
this.times++;
if (this.times % 2 === 0) {
// 飞机在就源源不断地补充子弹
bullets.push(new Bullet(bulletParam));
}
}
}
var heroObj = new heroPaint(heroParam);
// 让飞机跟着鼠标动
canvas.onmousemove = function (e) {
if(state === pause){
state = running;
}
if (state === running) {
// 获取鼠标移动后的位置
heroObj.x = e.offsetX - heroObj.width / 2;
heroObj.y = e.offsetY - heroObj.height / 2;
}
}设置子弹和敌机状态：
// 子弹
var bullet = new Image();
bullet.class="lazy" data-src = 'img/bullet1.png';
var bulletParam = {
bullet: bullet,
width: 9,
height: 21
}
function Bullet(param) {
this.bullet = param.bullet;
this.width = param.width;
this.height = param.height;
this.x = heroObj.x + heroObj.width / 2 - this.width / 2;
this.y = heroObj.y - this.height - 10;
// 判断是否被撞击的标志
this.down = false;
this.draw = function () {
ctx.drawImage(this.bullet, this.x, this.y, this.width, this.height);
}
// 运动
this.sport = function () {
this.y -= 25;
}
}
var bullets = [];
// 绘制子弹
function bulletsPaint() {
for (var i = 0; i < bullets.length; i++) {
bullets[i].draw();
}
}
function bulletsSport() {
for (var i = 0; i < bullets.length; i++) {
bullets[i].sport();
}
}
// 删除子弹
// 1. 子弹飞出屏幕外面
// 2. 子弹敌机碰撞了
function bulletsDelete() {
for (var i = 0; i < bullets.length; i++) {
if (bullets[i].y < -bullets[i].height || bullets[i].down) {
bullets.splice(i, 1);
}
}
}
// 绘制敌机
// 敌方小号飞机
var enemy1Arr = ['img/enemy1.png', 'img/enemy1_down1.png', 'img/enemy1_down2.png', 'img/enemy1_down3.png',
'img/enemy1_down4.png'
];
var enemy1Plane = [];
for (var i = 0; i < enemy1Arr.length; i++) {
enemy1Plane[i] = new Image();
enemy1Plane[i].class="lazy" data-src = enemy1Arr[i];
}
// 小号飞机信息
var enemy1 = {
enemyPlane: enemy1Plane,
width: 57,
height: 51,
life: 3
}
// 敌方中号飞机
var enemy2Arr = ['img/enemy2.png', 'img/enemy2_down1.png', 'img/enemy2_down2.png', 'img/enemy2_down3.png',
'img/enemy2_down4.png'
];
var enemy2Plane = [];
for (var i = 0; i < enemy2Arr.length; i++) {
enemy2Plane[i] = new Image();
enemy2Plane[i].class="lazy" data-src = enemy2Arr[i];
}
// 中号飞机信息
var enemy2 = {
enemyPlane: enemy2Plane,
width: 69,
height: 95,
life: 5
}
// 敌方大号飞机
var enemy3Arr = ['img/enemy3_n1.png', 'img/enemy3_n2.png', 'img/enemy3_hit.png', 'img/enemy3_down1.png',
'img/enemy3_down2.png', 'img/enemy3_down3.png', 'img/enemy3_down4.png', 'img/enemy3_down5.png',
'img/enemy3_down6.png'
];
var enemy3Plane = [];
for (var i = 0; i < enemy3Arr.length; i++) {
enemy3Plane[i] = new Image();
enemy3Plane[i].class="lazy" data-src = enemy3Arr[i];
}
// 大号飞机信息
var enemy3 = {
enemyPlane: enemy3Plane,
width: 169,
height: 258,
life: 10
}
// 敌机的构造函数
function Enemy(param) {
this.enemyPlane = param.enemyPlane;
this.width = param.width;
this.height = param.height;
this.life = param.life;
this.x = Math.random() * (width - this.width);
this.y = -this.height;
this.index = 0;
// 判断敌机是否发生碰撞
this.down = false;
// 是否爆照完成
this.bang = false;
this.paint = function () {
ctx.drawImage(this.enemyPlane[this.index], this.x, this.y, this.width, this.height);
}
this.sport = function () {
if (!this.down) {
// 当前敌机未被碰撞时
this.y += 5;
} else {
this.index++;
if (this.index === this.enemyPlane.length) {
this.index = this.enemyPlane.length - 1;
this.bang = true;
}
}
}
// 判断是否被碰撞
this.hit = function (obj) {
return obj.x + obj.width >= this.x && obj.x <= this.x + this.width &&
obj.y <= this.y + this.height && obj.y + obj.height >= this.y;
}
}
var enemies = [];
var times = 0
function pushEnemy() {
times++;
if (times % 10 == 0) {
var random = Math.random();
if (random < 0.5) {
enemies.push(new Enemy(enemy1));
} else if (random < 0.8) {
// 中号飞机
enemies.push(new Enemy(enemy2));
} else {
// 大号飞机
enemies.push(new Enemy(enemy3));
}
}
}
// 绘制、运动飞机对象
function enemyPaint() {
for (var i = 0; i < enemies.length; i++) {
enemies[i].paint();
}
}
function enemySport() {
for (var i = 0; i < enemies.length; i++) {
enemies[i].sport();
}
}
function enemyDelete() {
for (var i = 0; i < enemies.length; i++) {
if (enemies[i].y >= height || enemies[i].bang) {
enemies.splice(i, 1);
}
}
}
// 如何检测每一个敌机是否被（每一个子弹 hero）碰撞
function checkHit() {
for (var i = 0; i < enemies.length; i++) {
// 子弹和敌机撞击
for (var j = 0; j < bullets.length; j++) {
if (enemies[i].hit(bullets[j])) {
bullets[j].down = true;
enemies[i].life--;
if (enemies[i].life == 0) {
enemies[i].down = true;
if(enemies[i].width == 169){
score += 10;
}else if(enemies[i].width == 69){
score += 5;
}else{
score += 3;
}
}
}
}
// 敌机和hero
if (enemies[i].hit(heroObj)) {
enemies[i].life -= heroObj.life;
heroObj.down = true;
if(enemies[i].life <= 0){
enemies[i].down = true;
if(enemies[i].width == 169){
score += 10;
}else if(enemies[i].width == 69){
score += 5;
}else{
score += 3;
}
}
}
}
}设置游戏暂停和生命值、分数：
// 游戏暂停画面信息
var pauseImg = new Image();
pauseImg.class="lazy" data-src = 'img/game_pause_nor.png';
function gameoverfn() {
ctx.font = "50px bold"
ctx.fillText("GAME OVER !!!", 80, 300);
ctx.fillText("ONCE MORE !!!", 80, 400);
};
// 分数和生命值
var score = 0;
// 绘制分数和生命值
function scoreText() {
ctx.font = "30px bold"
ctx.strokeText(`Score:${score}`, 10, 30)
ctx.fillText("life:" + heroParam.life, 300, 30);
};
// 在定时器中绘制每一帧的图像
var timer = setInterval(function () {
// 调用背景图片绘制函数绘制
bgObj.draw()
bgObj.scroll()
// 判断游戏状态,state为ready时绘制logo图形
switch (state) {
case ready:
logoObj.draw();
break;
case loading:
loadingObj.draw();
loadingObj.sport();
break;
case running:
heroObj.draw();
heroObj.sport();
heroObj.shoot();
// 绘制子弹
bulletsPaint();
bulletsSport();
bulletsDelete();
// 绘制敌机
pushEnemy();
enemyPaint();
enemySport();
checkHit();
enemyDelete();
scoreText();
break;
case pause:
ctx.drawImage(pauseImg, 210, 376, 60, 45);
heroObj.draw();0
heroObj.shoot();
// 绘制子弹
bulletsPaint();
bulletsDelete();
// 绘制敌机
enemyPaint();
scoreText()
break;
case over:
heroObj.draw();
gameoverfn();
scoreText();
break;
}
}, 60)整体代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
canvas {
border: 1px solid #f8c1ab;
position: absolute;
left: 0;
right: 0;
margin: auto;
}
</style>
</head>
<body>
<canvas id="canvas" width="480" height="852"></canvas>
<script>
// 画布
var canvas = document.getElementById('canvas')
var ctx = canvas.getContext('2d');
// 存储画布宽高
var width = canvas.width;
var height = canvas.height;
var height = 852;
// 准备初始化
var ready = 0;
var loading = 1;
var running = 2;
var pause = 3;
var over = 4;
var life = 3;
var score = 0;
// 定义初始状态
var state = ready;
// 一. 准备阶段,在画布上以图片的形式画出背景图片
var bg = new Image();
bg.class="lazy" data-src = 'img/background.png';
// 1. 创建一个对象,用来存储当前图片绘制的等信息
var bgParam = {
bg: bg, //对象里的第一个参数为构建的image对象,.class="lazy" data-src属性存储了图片的信息
x: 0,
y: 0,
width: 480,
height: 852
}
// 2 .创建构造函数,调用函数时绘制这张图,将图片绘制的信息传递给这个函数时,根据传递的信息绘制出图片
function bgPaint(param) {
this.bg = param.bg;
this.x = param.x;
this.y = param.y;
this.width = param.width;
this.height = param.height;
// 两张图片交替绘制,实现滚动效果
this.y1 = -this.height;
// 绘制图片
this.draw = function () {
ctx.drawImage(this.bg, this.x, this.y, this.width, this.height)
ctx.drawImage(this.bg, this.x, this.y1, this.width, this.height)
}
// 让图片不断下移,实现动态滚动效果
this.scroll = function () {
this.y += 7;
this.y1 += 7;
// 每张图片到达底部后重新回到上面
if (this.y >= this.height) {
this.y = -this.height
}
if (this.y1 >= this.height) {
this.y1 = -this.height
}
}
}
// 创建背景图片对象
var bgObj = new bgPaint(bgParam);
// 二. 绘制游戏开始前logo
var logo = new Image();
logo.class="lazy" data-src = 'img/start.png'
var logoParam = {
logo: logo,
x: 0,
y: 0,
width: 480,
height: 852
}
function logoPaint(param) {
this.logo = param.logo;
this.x = param.x;
this.y = param.y;
this.width = param.width;
this.height = param.height;
this.draw = function () {
ctx.drawImage(this.logo, this.x, this.y, this.width, this.height)
}
}
var logoObj = new logoPaint(logoParam);
// 点击后改变游戏状态
canvas.addEventListener('click',function () {
if (state == ready) {
state = loading;
}else if (state == loading){
state = pause;
}else if (state == running){
state = pause;
}else if (state == pause){
if(state != over){
state = running;
console.log(22);
}
}
})
canvas.addEventListener('mouseleave',function(){
if(state == loading){
state = pause;
}else if (state == running){
state = pause;
}
})
// 三. 游戏加载阶段
// 定义数组存放图片的信息
var imgArr = ['img/game_loading1.png', 'img/game_loading2.png', 'img/game_loading3.png',
'img/game_loading4.png']
var loadingImg = [];
for (var i = 0; i < imgArr.length; i++) {
loadingImg[i] = new Image();
loadingImg[i].class="lazy" data-src = imgArr[i]
}
var loadingParam = {
loadingImg: loadingImg, //第一个参数为一个数组,数组里存放了一系列new Image()所new出来的图片对象,图片对象.class="lazy" data-src为地址
width: 186,
height: 38
}
function loadingPaint(param) {
this.loadingImg = param.loadingImg;
this.width = param.width;
this.height = param.height;
this.x = 0;
this.y = height - param.height;
// 定义绘制的下标
this.index = 0;
this.times = 0;
// 绘制图片
this.draw = function () {
ctx.drawImage(this.loadingImg[this.index], this.x, this.y, this.width, this.height)
}
// 每隔一段时间通过改变下标来改变图片以使图片动起来
this.sport = function () {
// 定时器累计一定次数后才改变下一张图片,避免加载图片更换太快
this.times++;
if (this.times % 2 == 0) {
this.index++;
if (this.index == this.loadingImg.length) {
// 绘制完加载图片后,改变游戏状态
state = running;
}
}
}
}
// 在绘制完加载图片后自动更换了游戏运行状态
var loadingObj = new loadingPaint(loadingParam);
// 四. 游戏进行阶段
// 绘制我方飞机
var heroArr = ['img/hero1.png', 'img/hero2.png', 'img/hero_blowup_n1.png', 'img/hero_blowup_n2.png',
'img/hero_blowup_n3.png', 'img/hero_blowup_n4.png'
]
var heroPlane = [];
for (var i = 0; i < heroArr.length; i++) {
heroPlane[i] = new Image();
heroPlane[i].class="lazy" data-src = heroArr[i]
}
// 定义飞机的图像信息
var heroParam = {
heroPlane: heroPlane,
width: 99,
height: 124,
life:5
}
var flag = true;
function heroPaint(param) {
this.heroPlane = param.heroPlane;
this.width = param.width;
this.height = param.height;
this.life = param.life;
flag = false;
this.x = width / 2 - this.width / 2;
this.y = height - this.height;
// 存储切换图片的下标
this.index = 0;
// 判断是否被撞击
this.down = false;
// 切换频率
this.times = 0;
// 绘制hero函数
this.draw = function () {
ctx.drawImage(this.heroPlane[this.index], this.x, this.y, this.width, this.height)
}
// 判断飞机是否被撞击以及被撞击后的状态改变
this.sport = function () {
// 没有被撞击时飞机的状态只会在hero1和hero2之间切换
if (!this.down) {
if (this.index == 0) {
this.index = 1;
} else {
this.index = 0;
}
} else {
// 被撞击后状态的改变加上爆炸的样子
this.index++;
if (this.index == this.heroPlane.length) {
// 游戏结束后飞机停留在冒烟状态
this.index = this.heroPlane.length - 1;
heroParam.life--;
if (heroParam.life <= 0) {
state = over;
} else {
// 还有生命值时重新开始游戏
heroObj = new heroPaint(heroParam)
}
}
}
}
this.shoot = function () {
this.times++;
if (this.times % 2 === 0) {
// 飞机在就源源不断地补充子弹
bullets.push(new Bullet(bulletParam));
}
}
}
var heroObj = new heroPaint(heroParam);
// 让飞机跟着鼠标动
canvas.onmousemove = function (e) {
if(state === pause){
state = running;
}
if (state === running) {
// 获取鼠标移动后的位置
heroObj.x = e.offsetX - heroObj.width / 2;
heroObj.y = e.offsetY - heroObj.height / 2;
}
}
// 子弹
var bullet = new Image();
bullet.class="lazy" data-src = 'img/bullet1.png';
var bulletParam = {
bullet: bullet,
width: 9,
height: 21
}
function Bullet(param) {
this.bullet = param.bullet;
this.width = param.width;
this.height = param.height;
this.x = heroObj.x + heroObj.width / 2 - this.width / 2;
this.y = heroObj.y - this.height - 10;
// 判断是否被撞击的标志
this.down = false;
this.draw = function () {
ctx.drawImage(this.bullet, this.x, this.y, this.width, this.height);
}
// 运动
this.sport = function () {
this.y -= 25;
}
}
var bullets = [];
// 绘制子弹
function bulletsPaint() {
for (var i = 0; i < bullets.length; i++) {
bullets[i].draw();
}
}
function bulletsSport() {
for (var i = 0; i < bullets.length; i++) {
bullets[i].sport();
}
}
// 删除子弹
// 1. 子弹飞出屏幕外面
// 2. 子弹敌机碰撞了
function bulletsDelete() {
for (var i = 0; i < bullets.length; i++) {
if (bullets[i].y < -bullets[i].height || bullets[i].down) {
bullets.splice(i, 1);
}
}
}
// 绘制敌机
// 敌方小号飞机
var enemy1Arr = ['img/enemy1.png', 'img/enemy1_down1.png', 'img/enemy1_down2.png', 'img/enemy1_down3.png',
'img/enemy1_down4.png'
];
var enemy1Plane = [];
for (var i = 0; i < enemy1Arr.length; i++) {
enemy1Plane[i] = new Image();
enemy1Plane[i].class="lazy" data-src = enemy1Arr[i];
}
// 小号飞机信息
var enemy1 = {
enemyPlane: enemy1Plane,
width: 57,
height: 51,
life: 3
}
// 敌方中号飞机
var enemy2Arr = ['img/enemy2.png', 'img/enemy2_down1.png', 'img/enemy2_down2.png', 'img/enemy2_down3.png',
'img/enemy2_down4.png'
];
var enemy2Plane = [];
for (var i = 0; i < enemy2Arr.length; i++) {
enemy2Plane[i] = new Image();
enemy2Plane[i].class="lazy" data-src = enemy2Arr[i];
}
// 中号飞机信息
var enemy2 = {
enemyPlane: enemy2Plane,
width: 69,
height: 95,
life: 5
}
// 敌方大号飞机
var enemy3Arr = ['img/enemy3_n1.png', 'img/enemy3_n2.png', 'img/enemy3_hit.png', 'img/enemy3_down1.png',
'img/enemy3_down2.png', 'img/enemy3_down3.png', 'img/enemy3_down4.png', 'img/enemy3_down5.png',
'img/enemy3_down6.png'
];
var enemy3Plane = [];
for (var i = 0; i < enemy3Arr.length; i++) {
enemy3Plane[i] = new Image();
enemy3Plane[i].class="lazy" data-src = enemy3Arr[i];
}
// 大号飞机信息
var enemy3 = {
enemyPlane: enemy3Plane,
width: 169,
height: 258,
life: 10
}
// 敌机的构造函数
function Enemy(param) {
this.enemyPlane = param.enemyPlane;
this.width = param.width;
this.height = param.height;
this.life = param.life;
this.x = Math.random() * (width - this.width);
this.y = -this.height;
this.index = 0;
// 判断敌机是否发生碰撞
this.down = false;
// 是否爆照完成
this.bang = false;
this.paint = function () {
ctx.drawImage(this.enemyPlane[this.index], this.x, this.y, this.width, this.height);
}
this.sport = function () {
if (!this.down) {
// 当前敌机未被碰撞时
this.y += 5;
} else {
this.index++;
if (this.index === this.enemyPlane.length) {
this.index = this.enemyPlane.length - 1;
this.bang = true;
}
}
}
// 判断是否被碰撞
this.hit = function (obj) {
return obj.x + obj.width >= this.x && obj.x <= this.x + this.width &&
obj.y <= this.y + this.height && obj.y + obj.height >= this.y;
}
}
var enemies = [];
var times = 0
function pushEnemy() {
times++;
if (times % 10 == 0) {
var random = Math.random();
if (random < 0.5) {
enemies.push(new Enemy(enemy1));
} else if (random < 0.8) {
// 中号飞机
enemies.push(new Enemy(enemy2));
} else {
// 大号飞机
enemies.push(new Enemy(enemy3));
}
}
}
// 绘制、运动飞机对象
function enemyPaint() {
for (var i = 0; i < enemies.length; i++) {
enemies[i].paint();
}
}
function enemySport() {
for (var i = 0; i < enemies.length; i++) {
enemies[i].sport();
}
}
function enemyDelete() {
for (var i = 0; i < enemies.length; i++) {
if (enemies[i].y >= height || enemies[i].bang) {
enemies.splice(i, 1);
}
}
}
// 如何检测每一个敌机是否被（每一个子弹 hero）碰撞
function checkHit() {
for (var i = 0; i < enemies.length; i++) {
// 子弹和敌机撞击
for (var j = 0; j < bullets.length; j++) {
if (enemies[i].hit(bullets[j])) {
bullets[j].down = true;
enemies[i].life--;
if (enemies[i].life == 0) {
enemies[i].down = true;
if(enemies[i].width == 169){
score += 10;
}else if(enemies[i].width == 69){
score += 5;
}else{
score += 3;
}
}
}
}
// 敌机和hero
if (enemies[i].hit(heroObj)) {
enemies[i].life -= heroObj.life;
heroObj.down = true;
if(enemies[i].life <= 0){
enemies[i].down = true;
if(enemies[i].width == 169){
score += 10;
}else if(enemies[i].width == 69){
score += 5;
}else{
score += 3;
}
}
}
}
}
// 游戏暂停画面信息
var pauseImg = new Image();
pauseImg.class="lazy" data-src = 'img/game_pause_nor.png';
function gameoverfn() {
ctx.font = "50px bold"
ctx.fillText("GAME OVER !!!", 80, 300);
ctx.fillText("ONCE MORE !!!", 80, 400);
};
// 分数和生命值
var score = 0;
// 绘制分数和生命值
function scoreText() {
ctx.font = "30px bold"
ctx.strokeText(`Score:${score}`, 10, 30)
ctx.fillText("life:" + heroParam.life, 300, 30);
};
// 在定时器中绘制每一帧的图像
var timer = setInterval(function () {
// 调用背景图片绘制函数绘制
bgObj.draw()
bgObj.scroll()
// 判断游戏状态,state为ready时绘制logo图形
switch (state) {
case ready:
logoObj.draw();
break;
case loading:
loadingObj.draw();
loadingObj.sport();
break;
case running:
heroObj.draw();
heroObj.sport();
heroObj.shoot();
// 绘制子弹
bulletsPaint();
bulletsSport();
bulletsDelete();
// 绘制敌机
pushEnemy();
enemyPaint();
enemySport();
checkHit();
enemyDelete();
scoreText();
break;
case pause:
ctx.drawImage(pauseImg, 210, 376, 60, 45);
heroObj.draw();0
heroObj.shoot();
// 绘制子弹
bulletsPaint();
bulletsDelete();
// 绘制敌机
enemyPaint();
scoreText()
break;
case over:
heroObj.draw();
gameoverfn();
scoreText();
break;
}
}, 60)
</script>
</body>
</html>以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。
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