基本信息
源码名称：HTML5 canvas幽灵鬼魂动画代码 (吓人的效果)
源码大小：0.07M
文件格式：.zip
开发语言：js
更新时间：2019-03-11
   源码介绍 

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>HTML5 canvas幽灵鬼魂动画代码 - 源码之家</title>

<style>
canvas {
  position: fixed;
  top: 0;
  left: 0;
}
</style>

</head>
<body>

<script type="text/javascript" src='js/p5.min.js'></script>

<div></div>

<script type="text/javascript">
var blobs = [];

function setup() {
  var iHeight = window.innerHeight;
  if (iHeight < 500) {
    iHeight = 500;
  }
  createCanvas(window.innerWidth, iHeight);

  drawingContext.shadowOffsetX = 0;
  drawingContext.shadowOffsetY = 0;
  drawingContext.shadowBlur = 60;
  drawingContext.shadowColor = "rgb(255, 176, 190)";

  for (var i = 0; i < 13; i  ) {
    blobs.push(new Blob(random(width), random(height)));
  }
}

function draw() {
  background(13, 33);

  for (var b = 0; b < blobs.length; b  ) {
    blobs[b].update();
    blobs[b].show();
  }
}

function Blob(x, y) {
  this.pos = createVector(x, y);
  this.vel = p5.Vector.random2D();
  this.vel.mult(random(1, 3));
  this.r = random(42, 72);
  this.yoff = random(1000);

  this.update = function() {
    this.pos.add(this.vel);
    if (this.pos.x > width || this.pos.x < 0) {
      this.vel.x *= -1;
    }
    if (this.pos.y > height || this.pos.y < 0) {
      this.vel.y *= -1;
    }
  }

  this.show = function() {
    noStroke();
    fill(255);
    push();
    translate(this.pos.x, this.pos.y);
    beginShape();
    var xoff = 0;
    for (var a = 0; a < TWO_PI; a  = 0.1) {
      var offset;
      if (a > PI/6 && a < 5 * PI/6) {
        offset = map(noise(xoff, this.yoff), 0, 1, -0.31 * this.r, 0.78 * this.r);
      } else {
        offset = map(noise(xoff, this.yoff), 0, 1, -0.08 * this.r, 0.08 * this.r);
      }
      var r = this.r   offset;
      var x = r * cos(a);
      var y = r * sin(a);
      vertex(x, y);
      xoff  = 0.1;
    }
    endShape(CLOSE);

    this.yoff  = 0.08;
    pop();
    
    var eyeOffset = 0.23 * this.r;

    stroke(54);
    fill(54);
    ellipse(this.pos.x - eyeOffset, this.pos.y - eyeOffset, 0.16 * this.r, 0.23 * this.r);
    ellipse(this.pos.x   eyeOffset, this.pos.y - eyeOffset, 0.16 * this.r, 0.23 * this.r);
    strokeWeight(4);
    line(this.pos.x - eyeOffset * 2, this.pos.y - eyeOffset * 2, this.pos.x, this.pos.y - eyeOffset);
    line(this.pos.x   eyeOffset * 2, this.pos.y - eyeOffset * 2, this.pos.x, this.pos.y - eyeOffset);
    fill(255);
    noStroke();
    ellipse(this.pos.x - eyeOffset, this.pos.y - eyeOffset - 3, 0.08 * this.r, 0.125 * this.r);
    ellipse(this.pos.x   eyeOffset, this.pos.y - eyeOffset - 3, 0.08 * this.r, 0.125 * this.r);
    
    fill(54);
    arc(this.pos.x, this.pos.y, 0.5 * this.r, 0.5 * this.r, 0, PI);
  }
}
</script>
<div style="text-align:center;">
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</body>
</html>