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053.飞机大战.html
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053.飞机大战.html
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<!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">
<link rel="stylesheet" href="./assets/global.css">
<style>
* {
-webkit-touch-callout: none;
}
body {
height: 100vh;
width: 100vw;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
</style>
</head>
<body>
<canvas id="game"></canvas>
<script type="module">
import { Randoms } from "https://unpkg.com/@3r/tool/lib/randoms.js";
import { aspectFill, aspectFit, scaleToFill } from "https://unpkg.com/@3r/tool/lib/picture.js";
/** @type {HTMLCanvasElement} */
let canvas = document.querySelector("#game")
let config = {
width: 480,
height: 852
}
let ctx = canvas.getContext('2d')
let width = canvas.clientWidth;
let height = canvas.clientHeight;
// 游戏背景
let gameBackground = null;
// 背景滚动速度
let gameBackgroundScrollingSpeed = 2;
// 背景滚动位置
let gameBackgroundScrollingY = 0
// 英雄图片
let gameHeroSprite = null
let gameHeroDieSprite = null
let gameHero = {
x: 0,
y: 0,
w: 0,
h: 0,
moveX: 0,
speed: 4,
score: 0,
isFire: true,
isDie: false,
isDestory: false,
get sprite() {
if (this.isDie) return gameHeroDieSprite
return gameHeroSprite
}
}
// 敌人图片
let gameEnemySprite = null
let gameEnemyDieSprite = null
let gameEnemy = []
// 游戏子弹
let gameBulletSprite = null;
let gameBullet = []
let lastGenerateEnemyTime = 0;
let lastGenerateBulletTime = 0
let isMouseDown = false;
let isTouchDown = false;
let updateIntervalId = null
let isGameOver = false;
// 禁止长按浮窗
canvas.addEventListener("contextmenu", (e) => {
e.preventDefault()
})
// 判断两矩形是否重叠
function isRectOverlap(rect1, rect2) {
if (!rect1) return false
if (!rect2) return false
if (rect1.x + rect1.w < rect2.x) return false
if (rect1.y + rect1.h < rect2.y) return false;
if (rect2.x + rect2.w < rect1.x) return false
if (rect2.y + rect2.h < rect1.y) return false;
return true
}
/**
* 加载图
* @param {string} src
* @returns {Promise<HTMLImageElement>}
*/
function loadImage(src) {
return new Promise((resolve) => {
let image = new Image()
image.src = src;
image.onload = (ev) => {
resolve(image)
}
})
}
// 滚动背景
function scrollingBackgrounds() {
gameBackgroundScrollingY += gameBackgroundScrollingSpeed;
let gameBackgroundHeight = gameBackground.height;
ctx.drawImage(gameBackground, 0, gameBackgroundScrollingY % gameBackgroundHeight - gameBackgroundHeight)
ctx.drawImage(gameBackground, 0, gameBackgroundScrollingY % gameBackgroundHeight)
ctx.drawImage(gameBackground, 0, gameBackgroundScrollingY % gameBackgroundHeight + gameBackgroundHeight)
}
// 更新玩家信息
function updateHero() {
if (gameHero.isDestory) return gameOver();
if (!gameHero.isDie) {
gameHero.x += gameHero.moveX * gameHero.speed;
if (gameHero.x < 0) {
gameHero.x = 0
}
else if (gameHero.x + gameHero.w > config.width) {
gameHero.x = config.width - gameHero.w
}
let x = gameHero.x;
let y = gameHero.y;
let w = gameHero.w;
let h = gameHero.h
}
ctx.drawImage(gameHero.sprite, gameHero.x, gameHero.y)
}
// 敌人速度区间
const ENEMY_MIN_SPEED = 3;
const ENEMY_MAX_SPEED = 10;
// 40帧 1个
const ENEMY_GENERATE_SPEED = 40;
// 生成敌人
function generateEnemy() {
lastGenerateEnemyTime++;
if (lastGenerateEnemyTime % ENEMY_GENERATE_SPEED == 0) {
let x = Randoms.getRandomInt(0, config.width - gameEnemySprite.width)
let y = -gameEnemySprite.height;
let w = gameEnemySprite.width;
let h = gameEnemySprite.height;
let moveY = 1;
let speed = Randoms.getRandomInt(ENEMY_MIN_SPEED, ENEMY_MAX_SPEED);
let isDie = false
let isDestory = false
gameEnemy.push({
x, y, w, h, moveY, speed, isDie, isDestory,
get sprite() {
if (this.isDie) return gameEnemyDieSprite
return gameEnemySprite
}
})
console.log("生成一个敌人", gameEnemy);
}
}
// 更新敌人信息
function updateEnemy() {
gameEnemy = gameEnemy.filter(e => e && !e.isDestory)
for (let i = 0; i < gameEnemy.length; i++) {
const tempEnemy = gameEnemy[i];
tempEnemy.y += tempEnemy.moveY * tempEnemy.speed;
let x = tempEnemy.x;
let y = tempEnemy.y;
let w = tempEnemy.w;
let h = tempEnemy.h
ctx.drawImage(tempEnemy.sprite, x, y)
if (tempEnemy.y > config.height) {
gameEnemy[i] = undefined
}
if (isRectOverlap(gameHero, tempEnemy)) {
die.call(gameHero)
die.call(tempEnemy)
}
}
}
// 子弹速度
const BULLET_SPEED = 8;
// 子弹方向
const BULLET_DIRECTION = -1
// 子弹起始点与飞机的位置Y轴偏移量
const BULLET_OFFSET_Y = 2
// 开火
function fire() {
let self = this;
if (!self.isFire) return;
let x = self.x + self.w / 2 - gameBulletSprite.width / 2
let y = self.y - gameBulletSprite.height - BULLET_OFFSET_Y;
let w = gameBulletSprite.width;
let h = gameBulletSprite.height;
let moveY = BULLET_DIRECTION;
let speed = BULLET_SPEED;
gameBullet.push({
x, y, w, h, moveY, speed
})
console.log("生成一发子弹", gameBullet);
}
// 死亡延迟 200ms
const DIE_DELAY = 200
// 死亡
function die() {
let self = this;
self.isDie = true;
self.moveY = 0;
self.isFire = false;
setTimeout(() => {
self.isDestory = true;
}, DIE_DELAY);
}
// 游戏结束
function gameOver() {
clearInterval(updateIntervalId);
ctx.fillStyle = 'rgba(255,255,255,.4)'
ctx.fillRect(0, 0, config.width, config.height)
ctx.fillStyle = '#000'
ctx.textAlign = "center"
ctx.font = "bold 36px serif"
ctx.fillText(`游戏结束`, config.width / 2, config.height * .3)
ctx.font = "500 26px serif"
ctx.fillText(`得分为: ${gameHero.score}分`, config.width / 2, config.height * .4, config.width * .7)
ctx.fillText(`点击屏幕，再来一局`, config.width / 2, config.height * .6 + 50, config.width * .7)
isGameOver = true
}
// 20帧 1个
const BULLET_GENERATE_SPEED = 20;
// 生成子弹
function generateBullet() {
lastGenerateBulletTime++;
if (lastGenerateBulletTime % BULLET_GENERATE_SPEED == 0) {
fire.call(gameHero)
}
}
// 更新子弹信息
function updateBullet() {
gameBullet = gameBullet.filter(e => e)
let tempGameEnemy = gameEnemy.filter(e => e && !e.isDie)
for (let i = 0; i < gameBullet.length; i++) {
const tempBullet = gameBullet[i];
tempBullet.y += tempBullet.moveY * tempBullet.speed;
let x = tempBullet.x;
let y = tempBullet.y;
let w = tempBullet.w;
let h = tempBullet.h
ctx.drawImage(gameBulletSprite, x, y)
// 检查是否击中
for (let j = 0; j < tempGameEnemy.length; j++) {
const tempEnemy = tempGameEnemy[j];
if (isRectOverlap(tempBullet, tempEnemy)) {
die.call(tempEnemy)
gameBullet[i].moveY = 0;
gameBullet[i] = undefined
gameHero.score++;
}
}
if (tempBullet.y < -h) {
gameBullet[i] = undefined
}
}
}
// 更新得分
function updateScore() {
ctx.textAlign = 'left'
ctx.textBaseline = "top"
ctx.font = "bold 28px serif"
ctx.fillText(`得分：${gameHero.score}`, 10, 10)
}
// 鼠标操作
function mousedown(e) {
if (isGameOver) start()
else isMouseDown = true;
gameHero.moveX = Math.sign(e.offsetX - config.width / 2)
}
function mousemove(e) {
if (isMouseDown)
gameHero.moveX = Math.sign(e.offsetX - config.width / 2)
}
function mouseup(e) {
gameHero.moveX = 0
isMouseDown = false;
}
// 手机操作
function touchstart(e) {
e.preventDefault();
if (isGameOver) start()
else isTouchDown = true;
let [touch] = e.changedTouches
gameHero.moveX = Math.sign(touch.clientX - config.width / 2)
}
function touchmove(e) {
if (isTouchDown) {
let [touch] = e.changedTouches
gameHero.moveX = Math.sign(touch.clientX - config.width / 2)
}
}
function touchend(e) {
gameHero.moveX = 0
isTouchDown = false;
}
// 开始
async function start() {
isGameOver = false;
gameBackground = gameBackground || await loadImage('./assets/plane-wars/background.png')
gameHeroSprite = gameHeroSprite || await loadImage('./assets/plane-wars/hero.png')
gameHeroDieSprite = gameHeroDieSprite || await loadImage('./assets/plane-wars/hero_die.png')
gameEnemySprite = gameEnemySprite || await loadImage('./assets/plane-wars/enemy.png')
gameEnemyDieSprite = gameEnemyDieSprite || await loadImage('./assets/plane-wars/enemy_die.png')
gameBulletSprite = gameBulletSprite || await loadImage('./assets/plane-wars/bullet.png')
// 展示长边
let aspectFitRes = aspectFit(gameBackground.width, gameBackground.height, document.body.clientWidth, document.body.clientHeight)
config.width = aspectFitRes.width;
config.height = Math.max(aspectFitRes.height, document.body.clientHeight)
canvas.setAttribute('width', config.width);
canvas.setAttribute('height', config.height);
ctx = canvas.getContext('2d')
width = canvas.clientWidth;
height = canvas.clientHeight;
canvas.width = width;
canvas.height = height;
gameHero = {
x: 0,
y: 0,
w: 0,
h: 0,
moveX: 0,
speed: 4,
score: 0,
isFire: true,
isDie: false,
isDestory: false,
get sprite() {
if (this.isDie) return gameHeroDieSprite
return gameHeroSprite
}
}
gameBullet = []
gameEnemy = []
gameHero.w = gameHeroSprite.width;
gameHero.h = gameHeroSprite.height;
gameHero.x = - gameHero.w / 2 + config.width / 2
gameHero.y = config.height * 4 / 5
canvas.removeEventListener("mousedown", mousedown)
canvas.removeEventListener("mousemove", mousemove)
document.removeEventListener("mouseup", mouseup)
canvas.removeEventListener("touchstart", touchstart)
canvas.removeEventListener("touchmove", touchmove)
document.removeEventListener("touchend", touchend)
canvas.addEventListener("mousedown", mousedown)
canvas.addEventListener("mousemove", mousemove)
document.addEventListener("mouseup", mouseup)
canvas.addEventListener("touchstart", touchstart)
canvas.addEventListener("touchmove", touchmove)
document.addEventListener("touchend", touchend)
updateIntervalId = setInterval(update, 1000 / 60);
}
// 更新
function update() {
ctx.clearRect(0, 0, config.width, config.height)
scrollingBackgrounds();
generateEnemy();
updateEnemy();
updateHero();
generateBullet();
updateBullet();
updateScore();
}
start()
</script>
</body>
</html>