js实现闪电能力转移动画效果-html代码-BFW代码库

代码语言：html

所属分类：粒子

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">

<title> - Energy</title>
<style>
    html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}
body {
  background-color: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
canvas {
  flex-shrink: 0;
  background-color: #222;
  image-rendering: -moz-crisp-edges;
  image-rendering: -webkit-crisp-edges;
  image-rendering: pixelated;
  object-fit: contain;
}

  </style>

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

<script>
      // UTIL
const PI = Math.PI,
TWO_PI = Math.PI * 2;

const Util = {};
Util.timeStamp = function () {
  return window.performance.now();
};
Util.random = function (min, max) {
  return min + Math.random() * (max - min);
};
Util.map = function (a, b, c, d, e) {
  return (a - b) / (c - b) * (e - d) + d;
};
Util.lerp = function (value1, value2, amount) {
  return value1 + (value2 - value1) * amount;
};
Util.clamp = function (value, min, max) {
  return Math.max(min, Math.min(max, value));
};
// Vector
class Vector {
  constructor(x, y) {
    this.x = x || 0;
    this.y = y || 0;
  }
  set(x, y) {
    this.x = x;
    this.y = y;
  }
  reset() {
    this.x = 0;
    this.y = 0;
  }
  fromAngle(angle) {
    let x = Math.cos(angle),
    y = Math.sin(angle);
    return new Vector(x, y);
  }
  add(vector) {
    this.x += vector.x;
    this.y += vector.y;
  }
  sub(vector) {
    this.x -= vector.x;
    this.y -= vector.y;
  }
  mult(scalar) {
    this.x *= scalar;
    this.y *= scalar;
  }
  div(scalar) {
    this.x /= scalar;
    this.y /= scalar;
  }
  dot(vector) {
    return vector.x * this.x + vector.y * this.y;
  }
  limit(limit_value) {
    if (this.mag() > limit_value) this.setMag(limit_value);
  }
  mag() {
    return Math.hypot(this.x, this.y);
  }
  setMag(new_mag) {
    if (this.mag() > 0) {
      this.normalize();
    } else {
      this.x = 1;
      this.y = 0;
    }
    this.mult(new_mag);
  }
  normalize() {
    let mag = this.mag();
    if (mag > 0) {
      this.x /= mag;
      this.y /= mag;
    }
  }
  heading() {
    return Math.atan2(this.y, this.x);
  }
  setHeading(angle) {
    let mag = this.mag();
    this.x = Math.cos(angle) * mag;
    this.y = Math.sin(angle) * mag;
  }
  dist(vector) {
    return new Vector(this.x - vector.x, this.y - vector.y).mag();
  }
  angle(vector) {
    return Math.atan2(vector.y - this.y, vector.x - this.x);
  }
  copy() {
    return new Vector(this.x, this.y);
  }}


// Init canvas
let canvas = document.createElement("canvas"),
ctx = canvas.getContext("2d"),
H = canvas.height = window.innerHeight,
W = canvas.width = window.innerWidth;
document.body.appendChild(canvas);

// Mouse
let mouse = {
  x: W / 2,
  y: H / 2 };

canvas.onmousemove = function (event) {
  mouse.x = event.clientX - canvas.offsetLeft;
  mouse.y = event.clientY - canvas.offsetTop;
};
document.body.onresize = function (event) {
  H = canvas.height = window.innerHeight;
  W = canvas.width = window.innerWidth;
};
// Let's go
class Arrow {
  constructor(x, y, target) {
    this.position = new Vector(x, y);
    this.velocity = new Vector().fromAngle(Util.random(0, TWO_PI));
    this.acceleration = new Vector(0, 0);
    this.target = target;
    this.travelled_distance = 0;
    this.min_size = 1;
    this.max_size = 6;
    this.size = Util.random(this.min_size, this.max_size);
    this.zone = this.size * 4;
    this.topSpeed = Util.map(this.size, this.min_size, this.max_size, 40, 10);
    let tailLength = Math.floor(Util.map(this.size, this.min_size, this.max_size, 4, 16));
    this.tail = [];
    for (let i = 0; i < tailLength; i++) {
      this.tail.push({
        x: this.position.x,
        y: this.position.y });

    }
    this.wiggle_speed = Util.map(this.size, this.min_size, this.max_size, 2, 1.2);
    this.blink_offset = Util.random(0, 100);
    this.alpha = Util.random(0.1, 1);
  }
  render() {
    this.update();
    this.draw();
  }
  update() {
    let old_position = this.position.copy();
    // .........完整代码请登录后点击上方下载按钮下载查看