canvas实现流线文本汇聚动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：动画

代码描述：canvas实现流线文本汇聚动画效果代码

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>
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: black;
    overflow: hidden;
}

canvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
p, a {
  color: white;
}
p {
  max-width: 30%;
  padding: 20px;
}
</style>

  
  
</head>

<body >
  <canvas id="canvas1"></canvas>
<canvas id="canvas1"></canvas>

      <script >
const canvas = document.getElementById('canvas1');
const ctx = canvas.getContext('2d');
canvas.width = 1700;
canvas.height = 500;

// canvas settings
ctx.fillStyle = 'white';
ctx.strokeStyle = 'white';
ctx.lineWidth = 1;
ctx.letterSpacing = '30px';

class Particle {
  constructor(effect) {
    this.effect = effect;
    this.x = Math.floor(Math.random() * this.effect.width);
    this.y = Math.floor(Math.random() * this.effect.height);
    this.speedX;
    this.speedY;
    this.speedModifier = Math.floor(Math.random() * 2 + 1);
    this.history = [{ x: this.x, y: this.y }];
    this.maxLength = Math.floor(Math.random() * 40 + 10);
    this.angle = 0;
    this.newAngle = 0;
    this.angleCorrector = Math.random() * 0.5 + 0.01;
    this.timer = this.maxLength * 2;
    //this.colors = ['#7d0101', '#ad0303', '#db0202', '#ff0303', '#fc2323', '#fc4747', '#fc7e7e', 'white'];
    //this.colors = ['#f8dc3d', '#f8dc3d', '#f2d322', '#c9ad08', '#917d03', '#574a00', '#fae678', '#fcee9f', '#fff7c7','white'];
    this.colors = ['rgb(255,255,0)'];
    this.color = this.colors[Math.floor(Math.random() * this.colors.length)];
  }
  draw(context) {
    context.beginPath();
    context.moveTo(this.history[0].x, this.history[0].y);
    for (let i = 0; i < this.history.length; i++) {
      context.lineTo(this.history[i].x, this.history[i].y);
    }
    context.strokeStyle = this.color;
    context.stroke();
  }
  update() {
    this.timer--;
    if (this.timer >= 1) {
      let x = Math.floor(this.x / this.effect.cellSize);
      let y = Math.floor(this.y / this.effect.cellSize);
      let index = y * this.effect.cols + x;

      if (this.effect.flowField[index]) {
        this.newAngle = this.effect.flowField[index].colorAngle;
        if (this.angle > this.newAngle) {
          this.angle -= this.angleCorrector;
        } else if (this.angle < this.newAngle) {
          this.angle += this.angleCorrector;
        } else {
          this.angle = this.newAngle;
        }
      }

      this.speedX = Math.cos(this.angle);
      this.speedY = Math.sin(this.angle);
      this.x += this.speedX * this.speedModifier;
      this.y += this.speedY * this.speedModifier;

      this.history.push({ x: this.x, y: this.y });
      if (this.history.length > this.maxLength) {
        this.history.shift();
      }
    } else if (this.history.length > 1) {
      this.history.shift();
    } else {
      this.reset();
    }

  }
  reset() {
    let attempts = 0;
    let resetSuccess = false;

    while (attempts < 20 && !resetSuccess) {
      attempts++;
      let testIndex = Math.floor(Math.random() * this.effect.flowField.length);
      if (this.effect.flowField[testIndex].alpha > 0) {
        this.x = this.effect.flowField[testIndex].x;
        this.y = this.effect.flowField[testIndex].y;
        this.history = [{ x: this.x, y: this.y }];
        this.timer = this.maxLength * 2;
        resetSuccess = true;
      }
    }
    if (!resetSuccess) {
      this.x = Math.random() * this.effect.width;
      this.y = Math.random() * this.effect.height;
      this.history = [{ x: this.x, y: this.y }];
      this.timer = this.maxLength * 2;
    }


  }}


class Effect {
  constructor(canvas, ctx) {
    this.canvas = canvas;
    this.context = ctx;
    this.width = this.canvas.width;
    this.height = this.canvas.height;
    this.particles = [];
    this.numberOfParticles = 10000;
    this.cellS.........完整代码请登录后点击上方下载按钮下载查看