js实现三角形粒子运动

时间：2021-05-26

本文实例为大家分享了js实现三角形粒子运动的具体代码，供大家参考，具体内容如下

效果(这里只是截了一个静态图，实际上里面的粒子是运动状态的)：

<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>粒子</title> <style> * { margin: 0; padding: 0; } body { overflow: hidden; } </style> <script> //随机数获取 3 10 *7+3 function random(min, max) { return Math.random() * (max - min) + min; } //亮色系 // colors = ['#7cb5ec', '#434348', '#90ed7d', '#f7a35c', '#8085e9', '#f15c80', '#e4d354', '#8085e8', '#8d4653', '#91e8e1']; //暗色系 colors = ['#c23531', '#2f4554', '#61a0a8', '#d48265', '#91c7ae', '#749f83', '#ca8622', '#bda29a', '#6e7074', '#546570', '#c4ccd3'] //获取窗口宽高 var width = window.innerWidth; var height = window.innerHeight; function Bubble() { this.r = random(5, 100); this.x1 = random(this.r, this.r * 2); this.y1 = random(this.r, this.r * 2); this.x2 = random(this.r, this.r * 2); this.y2 = random(this.r, this.r * 2); this.x3 = random(this.r, this.r * 2); this.y3 = random(this.r, this.r * 2); //随机获取colors数组里的颜色 this.color = colors[Math.floor(random(0, colors.length))]; //偏移步长 this.xr = random(-5, 5); this.yr = random(-5, 5); } Bubble.prototype = { //绘制 draw: function (context) { //开始路径 context.beginPath(); context.moveTo(this.x1, this.y1); context.lineTo(this.x2, this.y2); context.lineTo(this.x3, this.y3); context.lineTo(this.x1, this.y1); context.fillStyle = this.color; context.fill(); }, //移动 move: function (context) { this.x1 += this.xr; this.y1 += this.yr; this.x2 += this.xr; this.y2 += this.yr; this.x3 += this.xr; this.y3 += this.yr; //边缘检测 (this.x1 > width || this.x1 < 0) ? this.xr = -this.xr : null; (this.y1 > height || this.y1 < 0) ? this.yr = -this.yr : null; (this.x2 > width || this.x2 < 0) ? this.xr = -this.xr : null; (this.y2 > height || this.y2 < 0) ? this.yr = -this.yr : null; (this.x3 > width || this.x3 < 0) ? this.xr = -this.xr : null; (this.y3 > height || this.y3 < 0) ? this.yr = -this.yr : null; this.draw(context); } } window.onload = function () { //获取画布dom var canvas = document.querySelector('canvas'); //设置canvas的宽高 canvas.width = width; canvas.height = height; //获取画布上下文对象 var context = canvas.getContext('2d'); //数组存储bubble var arr = []; //生成粒子 var total = 100; //生成例子 for (var i = 0; i < total; i++) { var bubble = new Bubble(); bubble.draw(context); arr.push(bubble); } var id = setInterval(function () { //清除 context.clearRect(0, 0, width, height); //开始移动 for (var i = 0; i < arr.length; i++) { arr[i].move(context); } }, 1000 / 60) //点击次数 var count = 0; canvas.onclick = function () { if (count++ % 2 == 0) { //停止 clearInterval(id); } else { //运行 id = setInterval(function () { //清除 context.clearRect(0, 0, width, height); //开始移动 for (var i = 0; i < arr.length; i++) { arr[i].move(context); } }, 1000 / 60) } } } </script></head><body> <canvas title="点击停止，再次点击活动"></canvas></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。

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