原生js实现canvas社交距离交互动画效果-html代码-BFW代码库

代码语言：html

所属分类：动画

代码描述：原生js实现canvas社交距离交互动画效果

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">

<style>
/********************
  Common
********************/

html, body {
  height: 100%;
  width: 100%;
  font-family: Helvetica, verdana, monospace;
  color: #1995ad;
  font-size: 100%;
  padding: 0;
  margin: 0;
  letter-spacing: 0.2rem;
  overflow: hidden;
  background: #F2F2F2;
}

a {
  color: #1995ad;
  text-decoration: none;
}

h1 {
  font-size: 1.6rem;
}

h2 {
  padding-top: 0.8rem;
}

p {
  padding: 0.8rem 0;
  font-size: 0.8rem;
}

header#header {
  position: absolute;
  top: 0;
  left: 0;
  padding: 1.6rem;
}

p#loading {
  position: absolute;
  bottom: 0;
  right: 0;
  padding: 1.6rem;
}

/********************
  Contents
********************/

canvas#canvas {
  background: #F2F2F2;
}
</style>

</head>
<body translate="no">

<header id="header">
<h1>socialDistance</h1>
<p>Created date / April 13, 2020</p>
</header>

<main id="main">
<canvas id="canvas">This browser cannot use a canvas.</canvas>
</main>

<script >
(function () {
  'use strict';
  window.addEventListener('load', function () {
    var canvas = document.getElementById('canvas');

    if (!canvas || !canvas.getContext) {
      return false;
    }

    /********************
        Random Number
      ********************/

    function rand(min, max) {
      return Math.floor(Math.random() * (max - min + 1) + min);
    }

    /********************
        Var
      ********************/

    // canvas 
    var ctx = canvas.getContext('2d');
    var X = canvas.width = window.innerWidth;
    var Y = canvas.height = window.innerHeight;

    var mouseX = null;
    var mouseY = null;

    /********************
                         Particle
                       ********************/

    var particleNum = 2;
    var particles = [];

    if (X < 768) {
      particleNum = 2;
    }

    function Particle(ctx, x, y, r) {
      this.ctx = ctx;
      this.init(x, y, r);
    }

    Particle.prototype.init = function (x, y, r) {
      this.x = x;
      this.y = y;
      this.x1 = this.x;
      this.y1 = this.y;
      this.r = r;
      this.v = {
        x: rand(-2, 2) * Math.random() / 1.5,
        y: rand(-2, 2) * Math.random() / 1.5 };

      this.c = {
        circle: 'rgb(161, 214, 226)',
        text: 'rgb(25, 149, 173)' };

      this.ga = Math.random();
    };

    Particle.prototype.draw = function () {
      var ctx = this.ctx;
      ctx.save();
      ctx.beginPath();
      //ctx.globalCompositeOperation = 'xor';
      ctx.globalAlpha = this.ga;
      ctx.fillStyle = this.c.circle;
      ctx.arc(this.x, this.y, this.r, 0, Math.PI * 2, false);
      ctx.fill();
      ctx.restore();
      ctx.save();
      ctx.fillStyle = this.c.text;
      ctx.font = '8px "sans-serif"';
      ctx.textAlign = 'center';
      ctx.textBaseline = 'middle';
      ctx.fillText('r:' + this.r, this.x, this.y, this.r * 2);
      ctx.restore();
    };

    Particle.prototype.updatePosition = function () {
      this.x += this.v.x;
      this.y += this.v.y;
    };

    Particle.prototype.drawLines = function () {
      ctx.save();
      ctx.strokeStyle = 'rgb(161, 214, 226)';
      for (var i = 0; i < particles.length; i++) {
        ctx.beginPath();
        ctx.moveTo(this.x, this.y);
        ctx.lineTo(particles[i].x, particles[i].y);
        ctx.stroke();
      }
      ctx.restore();
    };

    Particle.prototype.distance = function (i) {
      var j = i;
      ctx.save();
      ctx.fillStyle = this.c.text;
      ctx.font = '8px "sans-serif"';
      ctx.textAlign = 'center';
      ctx.textBaseline = 'middle';
      for (var i = 0; i < particles.length; i++) {
        if (j !== i) {
          var x = Math.abs(this.x - particles[i].x);
          var y = Math.abs(this.y - particles[i].y);
          var h = x * x + y * y;
          var distance = Math.floor(Math.sqrt(h));
          ctx.fillText(distance, this.x - (this.x - particles[i].x) / 2, this.y - (this.y - particles[i].y) / 2, this.r * 2);
        }
      }
      ctx.restore();
    };

    Particle.prototype.coll = function (i) {
      var j = i;
      for (var i = 0; i < parti.........完整代码请登录后点击上方下载按钮下载查看