这是我参与更文挑战的第7天，活动详情查看：更文挑战javascript

序

很久没记录过博客了，原本想五一写一下的，结果太忙了html

本文是继上一次断章的《想要作网页游戏怎么办？PixiJs 篇（二）》后续篇

java

正文开始

上一篇中实现的效果是动画精灵出现了，可是尚未将动画精灵和键盘行走结合起来canvas

在动画精灵生成以后，能够为精灵添加状态属性，由于精灵是由4x4的雪碧图构成的，因此按照雪碧图进行分析，精灵能够分为4种状态，分别是向下、向左、向右、向上。数组

关于精灵的状态能够经过中文网进行简单了解：Pixi.js中文网markdown

也能够看这篇文章：blog.csdn.net/FE_dev/arti…app

在雪碧图中，其实包含了4种静态状态和4种动态状态ide

精灵的静态状态定义精灵在不移动时的四个位置
精灵的动画状态定义了精灵移动时的四个动做序列

下面使用states去定义这些状态函数

// 设置一个states对象字面量属性
jujin.states = {
	down: 0,
	left: 4,
	right: 8,
	up: 12,
	walkDown: [0, 3],
	walkLeft: [4, 7],
	walkRight: [8, 11],
	walkUp: [12, 15]	
};
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使用sprite.show(sprite.states.静止状态);能够只显示精灵某一静止状态使用sprite.playAnimation(sprite.states.动做状态);语句能够将只显示精灵某一动做状态oop

好比使用如下代码测试：

// 设置一个states对象字面量属性
jujin.states = {
    down: 0,
    left: 4,
    right: 8,
    up: 12,
    walkDown: [0, 3],
    walkLeft: [4, 7],
    walkRight: [8, 11],
    walkUp: [12, 15]
};
// jujin.show(jujin.states.left);
jujin.playAnimation(jujin.states.walkUp);
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效果：

目前已经将精灵的动做效果告一段落

接下来将键盘事件添加进入关于键盘移动的方法我使用的是中文网提供的keyboard方法

此方法能够监听并捕获键盘事件。使用起来也很方便：let keyObject = keyboard(keyValue); 能够为keyboard对象定义press和release方法

keyObject.press = () => {
  //key object pressed
};
keyObject.release = () => {
  //key object released
};
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使用unsubscribe方法删除事件监听器keyObject.unsubscribe();

下面是keyboard方法代码

// 键盘函数
function keyboard(value) {
  let key = {};
  key.value = value;
  key.isDown = false;
  key.isUp = true;
  key.press = undefined;
  key.release = undefined;
  //The `downHandler`
  key.downHandler = event => {
    if (event.key === key.value) {
      if (key.isUp && key.press) key.press();
      key.isDown = true;
      key.isUp = false;
      event.preventDefault();
    }
  };

  //The `upHandler`
  key.upHandler = event => {
    if (event.key === key.value) {
      if (key.isDown && key.release) key.release();
      key.isDown = false;
      key.isUp = true;
      event.preventDefault();
    }
  };

  //Attach event listeners
  const downListener = key.downHandler.bind(key);
  const upListener = key.upHandler.bind(key);
  
  window.addEventListener(
    "keydown", downListener, false
  );
  window.addEventListener(
    "keyup", upListener, false
  );
  
  // Detach event listeners
  key.unsubscribe = () => {
    window.removeEventListener("keydown", downListener);
    window.removeEventListener("keyup", upListener);
  };
  
  return key;
}
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接下来须要多添加一个按键判断方法keyMove，使用asdw控制：

this.keyMove(jujin)
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// 键盘控制移动
keyMove(person) {
    let left = keyboard('a'), up = keyboard('w'), right = keyboard('d'), down = keyboard('s');
    left.press = () => {
        // 按键按下使用动做状态
        person.playAnimation(person.states.walkLeft);
        person.vx = -2;
        person.vy = 0;
    };
    left.release = () => {
    	// 中止动做状态
        person.stopAnimation();
        // 每次按键抬起时使用静止状态
        person.show(person.states.left);
        person.vx = 0;
        person.vy = 0;
    };
    right.press = () => {
        person.playAnimation(person.states.walkRight);
        person.vx = 2;
        person.vy = 0;
    };
    right.release = () => {
        person.stopAnimation();
        person.show(person.states.right);
        person.vx = 0;
        person.vy = 0;
    };
    up.press = () => {
        person.playAnimation(person.states.walkUp);
        // person.show(person.states.up);
        person.vx = 0;
        person.vy = -2;
    };
    up.release = () => {
        person.stopAnimation();
        person.show(person.states.up);
        person.vx = 0;
        person.vy = 0;
    };
    down.press = () => {
        person.playAnimation(person.states.walkDown);
        // person.show(person.states.down);
        person.vx = 0;
        person.vy = 2;
    };
    down.release = () => {
        person.stopAnimation();
        person.show(person.states.down);
        person.vx = 0;
        person.vy = 0;
    };
},
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对了，在使用时要记得加上精灵的运动

this.app.ticker.add(()=> this.gameLoop(jujin ));
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gameLoop(person){
    person.x += person.vx;
    person.y += person.vy;
},
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这样操做以后，就能够达到键盘控制精灵运动的效果了

完整代码以下：

<template>
    <div id="animation"></div>
</template>

<script> import * as pixi from 'pixi.js' // 键盘函数 function keyboard(value) { let key = {}; key.value = value; key.isDown = false; key.isUp = true; key.press = undefined; key.release = undefined; //The `downHandler` key.downHandler = event => { if (event.key === key.value) { if (key.isUp && key.press) key.press(); key.isDown = true; key.isUp = false; event.preventDefault(); } }; //The `upHandler` key.upHandler = event => { if (event.key === key.value) { if (key.isDown && key.release) key.release(); key.isDown = false; key.isUp = true; event.preventDefault(); } }; //Attach event listeners const downListener = key.downHandler.bind(key); const upListener = key.upHandler.bind(key); window.addEventListener( "keydown", downListener, false ); window.addEventListener( "keyup", upListener, false ); // Detach event listeners key.unsubscribe = () => { window.removeEventListener("keydown", downListener); window.removeEventListener("keyup", upListener); }; return key; } export default { name:'animation', components: {}, props: {}, data() { return { loader: null, app:null, player: null, }; }, created() {}, mounted() { this.initState(); this.players(); }, watch: {}, computed: {}, methods: { initState() { this.loader = new pixi.Loader(); //Create a Pixi Application 建立一个pixi应用 this.app = new pixi.Application({ width: 735, // default: 800 宽度 height: 640, // default: 600 高度 antialias: true, // default: false 反锯齿 transparent: true, // default: false 透明度 resolution: 1 , // default: 1 分辨率 backgroundAlpha: 1 // 设置背景颜色透明度 0是透明 }); //其实上面已经设置透明了，这就不必设置背景颜色了 this.app.renderer.backgroundColor = 0x000000; document.getElementById('animation').appendChild(this.app.view) this.app.renderer.view.style.display = "block"; this.app.renderer.view.style.marginLeft = "30px"; //设置canvas的左外边距 this.app.renderer.autoResize = true; this.app.renderer.view.style.border = "1px dashed black"; //设置边框 }, players() { let stage = this.app.stage, Container = pixi.Container, Graphics = pixi.Graphics, player = this.player, TextureCache = pixi.utils.TextureCache, Texture = pixi.Texture, Rectangle = pixi.Rectangle, AnimatedSprite = pixi.AnimatedSprite; /******************* 加载纹理贴图，创造精灵，并将精灵添加到stage舞台上 *******************/ let jujinPng = './baoke/an3.png' this.loader.add([{name:'jujin', url: jujinPng}]).load(()=>{ // 使用SpriteUtilities let animate = new SpriteUtilities(pixi); // console.log(animate) //建立纹理数组 将雪碧图变成纹理数组 66,48 let frames = animate.filmstrip(jujinPng, 84, 81); // 建立纹理数组 只使用雪碧图中的一部分 // let frames = animate.frames(jujinPng,[[0,0],[66,0],[132,0],[198,0]], 66, 48); // console.log(frames) let jujin = animate.sprite(frames); //使用SpriteUtilities建立精灵 // let jujin = this.setTexture(frames); //使用以前的方法建立精灵 stage.addChild(jujin); jujin.animationSpeed=0.08; jujin.vx = 0; jujin.vy = 0; // jujin.play(); // 设置一个states对象字面量属性 jujin.states = { down: 0, left: 4, right: 8, up: 12, walkDown: [0, 3], walkLeft: [4, 7], walkRight: [8, 11], walkUp: [12, 15] }; this.keyMove(jujin) this.app.ticker.add(()=> this.gameLoop(jujin )); }) }, // 键盘控制移动 keyMove(person) { let left = keyboard('a'), up = keyboard('w'), right = keyboard('d'), down = keyboard('s'); left.press = () => { // person.show(person.states.left); person.playAnimation(person.states.walkLeft); person.vx = -2; person.vy = 0; }; left.release = () => { person.stopAnimation(); person.show(person.states.left); person.vx = 0; person.vy = 0; }; right.press = () => { person.playAnimation(person.states.walkRight); person.vx = 2; person.vy = 0; }; right.release = () => { person.stopAnimation(); person.show(person.states.right); person.vx = 0; person.vy = 0; }; up.press = () => { person.playAnimation(person.states.walkUp); // person.show(person.states.up); person.vx = 0; person.vy = -2; }; up.release = () => { person.stopAnimation(); person.show(person.states.up); person.vx = 0; person.vy = 0; }; down.press = () => { person.playAnimation(person.states.walkDown); // person.show(person.states.down); person.vx = 0; person.vy = 2; }; down.release = () => { person.stopAnimation(); person.show(person.states.down); person.vx = 0; person.vy = 0; }; }, gameLoop(person){ person.x += person.vx; person.y += person.vy; }, setTexture (texture) { // console.log(texture) let sprite = new pixi.AnimatedSprite(texture); return sprite; }, }, }; </script>
<style scoped>
</style>

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想要作网页游戏怎么办 ？PixiJs 篇（三）

序

正文开始

目前已经将精灵的动做效果告一段落

想要作网页游戏怎么办？PixiJs 篇（三）