这篇文章主要介绍了怎么用Vue3+Canvas实现坦克大战游戏的相关知识，内容详细易懂，操作简单快捷，具有一定借鉴价值，相信大家阅读完这篇怎么用Vue3+Canvas实现坦克大战游戏文章都会有所收获，下面我们一起来看看吧。
项目技术选型为 vue3、vite、less、pnpm、ts，按照vue3 官网文档来新建项目，注意：虽然我用了 vue3 实际上只是强行尝鲜，主体内容都是 js 用到的框架特性有限。
$ pnpm create vite <project-name> -- --template vue $ cd <project-name> $ pnpm install $ pnpm add -D less $ pnpm dev
游戏的核心为 canvas 画布和坦克元素，我们定义两个构造函数
canvas 构造函数的定义参数、方法：dom、dimension 尺寸、renderTo 渲染函数、drawText 文本绘制函数、drawImageSlice 图片绘制函数
canvas 图层按照一般的游戏设计优化理念，需要为静态背景和动态元素单独用不同的 canvas 图层表示，每次更新时只需要重新绘制动态元素就好了，我抽象出一个渲染函数
// 渲染
this.renderTo = function renderTo(container_id) {
if (!is_rendered) {
let container = document.getElementById(container_id)
//画布起始坐标
dom = document.createElement('canvas') // 创造canvas画布
dom.setAttribute('class', 'canvas')
ctx = dom.getContext('2d')
dom.setAttribute('width', container.clientWidth)
dom.setAttribute('height', container.clientHeight)
// 画布尺寸
dimension = {
x: container.clientWidth,
y: container.clientHeight,
}
container.insertBefore(dom, container.firstChild) // 插入cantainer容器
}
}想要知道画布中的具体位置坐标，可以定义一个函数，当鼠标滑动时候执行来将当前位置坐标绘制出来
this.drawText = function drawText(text, offset_left, offset_top, font) {
ctx.font = font || '25px Calibri'
ctx.fillStyle = '#fff'
ctx.fillText(text, offset_left, offset_top)
}
每次重绘前需要先擦掉整个画布
this.clear = function clear() {
ctx.clearRect(0, 0, dimension.x, dimension.y)
}坦克、子弹、建筑等元素等绘制都是通过这个函数来完成的，实现远离是利用来雪碧图，通过坐标抓取特定位置的图片元素来获取各种不同坦克等元素的UI；
通过 rotate 旋转元素来实现坦克的转向；
this.drawImageSlice = function drawImage(img_ele, sx, sy, sWidth, sHeight, x, y, rotatation) {
ctx.save()
ctx.translate((2 * x + sWidth) / 2, (2 * y + sHeight) / 2) // 改变起始点坐标
ctx.rotate((Math.PI / 180) * rotatation) // 旋转
x = x || 0
y = y || 0
ctx.drawImage(img_ele, sx, sy, sWidth, sHeight, -sWidth / 2, -sHeight / 2, sWidth, sHeight)
ctx.restore() // 复原
}
BattleCity 构造函数定义坦克的各种配置信息，和方法函数
let TankConfig = function (cfg) {
this.explosion_count = cfg.explosion_count
this.width = cfg.type.dimension[0]
this.height = cfg.type.dimension[1]
this.missle_type = cfg.missle_type || MISSILE_TYPE.NORMAL
this.x = cfg.x || 0
this.y = cfg.y || 0
this.direction = cfg.direction || DIRECTION.UP
this.is_player = cfg.is_player || 0
this.moving = cfg.moving || 0
this.alive = cfg.alive || 1
this.border_x = cfg.border_x || 0
this.border_y = cfg.border_y || 0
this.speed = cfg.speed || TANK_SPEED
this.direction = cfg.direction || DIRECTION.UP
this.type = cfg.type || TANK_TYPE.PLAYER0
}用键盘的 W、S、A、D、来表示上下左右方向键，按下键盘则会触发对应坦克实例的 move 函数，用于计算移动后的位置坐标信息，注意：对边界条件的判断，不可使其超出战场边界。
CanvasSprite.prototype.move = function (d, obstacle_sprites) {
this.direction = d
switch (d) {
case DIRECTION.UP:
if ((obstacle_sprites && !this.checkRangeOverlap(obstacle_sprites)) || !obstacle_sprites) {
this.y -= this.speed
if (this.y <= 5) {
if (!this.out_of_border_die) {
this.y = 0
} else {
// this.alive = 0;
this.explode()
document.getElementById('steelhit').play()
}
}
}
break
case DIRECTION.DOWN:
if ((obstacle_sprites && !this.checkRangeOverlap(obstacle_sprites)) || !obstacle_sprites) {
this.y += this.speed
if (this.y + this.height >= this.border_y - 10) {
if (!this.out_of_border_die) {
this.y = this.border_y - this.height
} else {
// this.alive = 0;
this.explode()
document.getElementById('steelhit').play()
}
}
}
break
case DIRECTION.LEFT:
if ((obstacle_sprites && !this.checkRangeOverlap(obstacle_sprites)) || !obstacle_sprites) {
this.x -= this.speed
if (this.x <= 5) {
if (!this.out_of_border_die) {
this.x = 0
} else {
// this.alive = 0;
this.explode()
document.getElementById('steelhit').play()
}
}
}
break
case DIRECTION.RIGHT:
if ((obstacle_sprites && !this.checkRangeOverlap(obstacle_sprites)) || !obstacle_sprites) {
this.x += this.speed
if (this.x + this.width >= this.border_x - 10) {
if (!this.out_of_border_die) {
this.x = this.border_x - this.width
} else {
// this.alive = 0;
this.explode()
document.getElementById('steelhit').play()
}
}
}
break
}
}
首先需要定义子弹的配置信息以及构造函数；
let MissileConfig = function (cfg) {
this.x = cfg.x
this.y = cfg.y
this.type = cfg.type || MISSILE_TYPE.NORMAL
this.width = cfg.width || this.type.dimension[0]
this.height = cfg.height || this.type.dimension[1]
this.direction = cfg.direction || DIRECTION.UP
this.is_from_player = cfg.is_from_player
this.out_of_border_die = cfg.out_of_border_die || 1 // 判断边界类型
this.border_x = cfg.border_x || 0
this.border_y = cfg.border_y || 0
this.speed = cfg.speed || TANK_SPEED
this.alive = cfg.alive || 1
}
var Missile = function (MissileConfig) {
var x = MissileConfig.x
var y = MissileConfig.y
var width = MissileConfig.width
var height = MissileConfig.width
var direction = MissileConfig.direction
this.type = MissileConfig.type
this.is_from_player = MissileConfig.is_from_player || 0
var explosion_count = 0
CanvasSprite.apply(this, [
{
alive: 1,
out_of_border_die: 1,
border_y: HEIGHT,
border_x: WIDTH,
speed: MISSILE_SPEED,
direction: direction,
x: x,
y: y,
width: width,
height: height,
},
])
this.isDestroied = function () {
return explosion_count > 0
}
this.explode = function () {
if (explosion_count++ === 5) {
this.alive = 0
}
}
this.getImg = function () {
if (explosion_count > 0) {
return {
width: TANK_EXPLOSION_FRAME[explosion_count].dimension[0],
height: TANK_EXPLOSION_FRAME[explosion_count].dimension[1],
offset_x: TANK_EXPLOSION_FRAME[explosion_count].image_coordinates[0],
offset_y: TANK_EXPLOSION_FRAME[explosion_count].image_coordinates[1],
}
} else {
return {
width: width,
height: height,
offset_x: this.type.image_coordinates[0],
offset_y: this.type.image_coordinates[1],
}
}
}
this.getHeadCoordinates = function () {
var h_x, h_y
switch (this.direction) {
case DIRECTION.UP:
h_x = this.x + this.width / 2 - this.type.dimension[0] / 2
h_y = this.y - this.type.dimension[1] / 2
break
case DIRECTION.DOWN:
h_x = this.x + this.width / 2 - this.type.dimension[0] / 2
h_y = this.y + this.height - this.type.dimension[1] / 2
break
case DIRECTION.LEFT:
h_x = this.x
h_y = this.y + this.width / 2 - this.type.dimension[0] / 2
break
case DIRECTION.RIGHT:
h_x = this.x + this.height
h_y = this.y + this.width / 2 - this.type.dimension[0] / 2
}
console.log({
x: h_x,
y: h_y,
})
return {
x: h_x,
y: h_y,
}
}
this._generateId = function () {
return uuidv4()
}
sprites[this._generateId()] = this
}然后再定义一个 fire 开发函数，当开火后，会使用 window.requestAnimationFrame() 来达到循环的效果，每次重绘最新的位置信息
this.fire = function (boolean_type) {
if (!this.missle || !this.missle.alive) {
var coor = this.getCannonCoordinates()
this.missle = new Missile(
new MissileConfig({
x: coor.x,
y: coor.y,
direction: this.direction,
type: this.miss_type,
is_from_player: boolean_type,
})
)
if (boolean_type) {
document.getElementById('shoot').play()
}
}
}
关于“怎么用Vue3+Canvas实现坦克大战游戏”这篇文章的内容就介绍到这里，感谢各位的阅读！相信大家对“怎么用Vue3+Canvas实现坦克大战游戏”知识都有一定的了解，大家如果还想学习更多知识，欢迎关注亿速云行业资讯频道。
免责声明：本站发布的内容（图片、视频和文字）以原创、转载和分享为主，文章观点不代表本网站立场，如果涉及侵权请联系站长邮箱：is@yisu.com进行举报，并提供相关证据，一经查实，将立刻删除涉嫌侵权内容。
