网页制作

Canvas波浪花环的示例代码
网页制作 2024/11/15 佚名
3 2

JS中的Canvas动画

几天没写博客了，今天又忙到很晚，教大家做一个波浪花环吧

Canvas波浪花环的示例代码
 

Canvas波浪花环的示例代码
 

Canvas波浪花环的示例代码

效果图如上所示：

老规矩先把代码给大家，新建一个html文档(新建一个txt文本文档，把后缀名改为“ .html
”),以记事本打开，把复制好的代码粘贴进去，“ 保存 ”，退出，双击或右键选择浏览器打开。

祝大家前端学习愉快，在今后的日子中与君共勉

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		body {
		  	background: #111;
		  	padding:0;
		  	margin:0;
			overflow:hidden;
		}
	</style>
</head>
<body>
	<div id="wrapper"></div>
</body>
<script>
(function(){
	'use strict';
	let wrapper, canvas, ctx, width, height, 
	Tau=Math.PI*2, PI180=Math.PI/180,
	systems=[];

/* PlanetarySystem */
	let PlanetarySystem = function(id='pSys'){
		Object.defineProperty(this, 'id',               { value:id, writable:true} );
		Object.defineProperty(this, 'x',                { value:0, writable:true });
		Object.defineProperty(this, 'y',                { value:0, writable:true });
		Object.defineProperty(this, 'allBodies',        { value:[], writable:true });
		Object.defineProperty(this, 'allBodiesLookup',  { value:{}, writable:true });    // fast id lookup for children
		Object.defineProperty(this, 'numBodies',        { value:0, writable:true });
	}
	PlanetarySystem.prototype.addBody = function(vo) {
		vo.parentSystem = this;
		vo.parentBody = vo.parentBody === null ? this : this.allBodiesLookup[vo.parentBody];
		let body = new PlanetaryBody(vo);
		body.update();
		this.allBodies.push(body);
		this.allBodiesLookup[vo.id] = body;
		this.numBodies += 1;
	}
	PlanetarySystem.prototype.setSpeedFactor = function(value){
		let body;
		for(let i=0; i<this.numBodies; i++){
			body = this.allBodies[i];
			body.setSpeedFactor(value);
		}
	}
	PlanetarySystem.prototype.update = function(){
		let body;
		for(let i=0; i<this.numBodies; i++){
			body = this.allBodies[i];
			body.update();
		}
	}
/* PlanetaryBody */
	let PlanetaryBody = function(vo){
		Object.defineProperty(this, 'id',					{ value:vo.id, writable:true} );
		Object.defineProperty(this, 'diameter',				{ value:vo.diameter, writable:true });
		Object.defineProperty(this, 'colour',				{ value:vo.colour, writable:true });
		Object.defineProperty(this, 'x',					{ value:0, writable:true });
		Object.defineProperty(this, 'y',					{ value:0, writable:true });
		Object.defineProperty(this, 'vx',					{ value:0, writable:true });
		Object.defineProperty(this, 'vy',					{ value:0, writable:true });
		Object.defineProperty(this, 'degrees',				{ value:vo.degrees, writable:true });
		Object.defineProperty(this, 'speedBase',			{ value:vo.speed, writable:true });
		Object.defineProperty(this, 'speed',				{ value:vo.speed , writable:true });
		Object.defineProperty(this, 'orbitalRadius',		{ value:vo.orbitalRadius, writable:true });
		Object.defineProperty(this, 'parentSystem',			{ value:vo.parentSystem, writable:true });
		Object.defineProperty(this, 'parentBody',			{ value:vo.parentBody, writable:true });

		return this;
	}
	PlanetaryBody.prototype.update = function(){
		let angle = this.degrees * PI180;
		this.degrees += this.speed;
		this.vx = this.orbitalRadius * Math.cos(angle);
		this.vy = this.orbitalRadius * Math.sin(angle);
		// update position
		if(this.parentBody != null){
			this.x = this.vx + this.parentBody.x;
			this.y = this.vy + this.parentBody.y;
		}
	}

/* init() */
	function init(){
		wrapper = document.querySelector('#wrapper');
		canvas = createCanvas('canvas', width, height);
		wrapper.appendChild(canvas);
		ctx = canvas.getContext('2d');
		setupEvents();
		resizeCanvas();

		/* Define new PlanetarySystem and set values */
		let system1 = new PlanetarySystem('pSys1');
		systems.push(system1);
		system1.x = width * .5;
		system1.y = height * .5;
		system1.addBody({id:'sun', diameter:5, degrees:0, speed:0, colour:'#FDFE1D', orbitalRadius:0, parentBody:null});
		for(let loop=30, i=0; i<loop; i+=1){
			system1.addBody({	id:				'ball'+i,
								diameter:		5,
								degrees:		0,
								speed:			2 + (loop * 0.15) - (i* 0.2),
								colour:			'#FDFE1D',
								orbitalRadius:	7*(i+1),
								parentBody:		'sun'});
		}
	}
	
/* Methods */
	function createCanvas(id, w, h){
		let tCanvas = document.createElement('canvas');
		tCanvas.width = w;
		tCanvas.height = h;
		tCanvas.id = id;
		return tCanvas;
	}

	function setupEvents(){
		window.onresize = resizeCanvas;
	}
	function resizeCanvas(){
		let rect = wrapper.getBoundingClientRect();
		width = window.innerWidth;
		height = window.innerHeight - rect.top -2;
		canvas.width = width;
		canvas.height = height;
		for(let i=0; i<systems.length; i++){
			systems[i].x = width * .5;
			systems[i].y = height * .5;
		}
	}

	function update(){
		for(let loop=systems.length, i=0; i<loop; i++){
			systems[i].update();
		}
	}

	function draw(){
		let system;
		let prev = null;
		for(let i=0; i<systems.length; i++){
			system = systems[i];
			let planetaryBody;
			for(let loop=system.numBodies, j=1; j<loop; j+=1) {
				planetaryBody = system.allBodies[j];
				ctx.beginPath();
				ctx.arc(planetaryBody.x, planetaryBody.y, planetaryBody.diameter, 0, Tau, false);
				ctx.fillStyle = planetaryBody.colour;
				ctx.fill();
				if(j>1){
					ctx.strokeStyle = planetaryBody.colour;
					ctx.lineWidth = 2;
					ctx.beginPath();
					ctx.moveTo(planetaryBody.x, planetaryBody.y);
					ctx.lineTo(prev.x, prev.y);
					ctx.stroke();
				}
				prev = {x:planetaryBody.x, y:planetaryBody.y};
			}
		}
	}

	function animate(){
		ctx.fillStyle = 'rgba(0,0,0, .05)';
		ctx.fillRect(0, 0, width, height);
		update();
		draw();
		requestAnimationFrame(animate);
	}
	init();
	animate();
}());
</script>
</html>
标签：
Canvas,波浪花环,花环
免责声明：本站文章均来自网站采集或用户投稿，网站不提供任何软件下载或自行开发的软件！ 如有用户或公司发现本站内容信息存在侵权行为，请邮件告知！ 858582#qq.com
岱庙资源网 Copyright www.zgmyg.com

评论“Canvas波浪花环的示例代码”

暂无“Canvas波浪花环的示例代码”评论...
www.zgmyg.com 岱庙资源网
129,905影音资源
244,626技术资源
111,817软件资源
578,645站长资源

更新日志

友情链接

杰晶网络 DDR爱好者之家 桃源资源网 杰网资源 富贵资源网 南强小屋 铁雪资源网 幽灵资源网 万梅资源网 狼山资源网 白云岛资源网 昆仑资源网 相思资源网 明霞山资源网 内蒙古资源网 黑松山资源网 茶园资源网 饿虎岗资源网 大旗谷资源网 常春岛资源网 岱庙资源网 兴国资源网 快活林资源网 蝙蝠岛资源网 帝王谷资源网 白云城资源网 伏龙阁资源网 清风细雨楼 天枫庄资源网 圆月山庄资源网 无争山庄资源网 神水资源网 移花宫资源网 神剑山庄资源网 无为清净楼资源网 金钱帮资源网 丐帮资源网 华山资源网 极乐门资源网 小李飞刀资源网 凤求凰客栈 风云阁资源网 金狮镖局 鸳鸯亭资源网 千金楼资源网 更多链接
岱庙资源网 Copyright www.zgmyg.com