Canvas的粒子组成文字动画特效

PetitQ Canvas 2019-2-12 2.45K 0 1

这是一款基于 canvas 的粒子组成文字动画特效。该特效在初始化时，动态生成粒子，并以动画的方式组成指定的文字。在生成文字之后，还可以用鼠标和文字进行交互。

HTML 结构

该特效的基本 HTML 结构如下。

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```
<section id="ci-particles">
```
```
  <canvas id="canvas"></canvas>
```
```
  <h1 id="headline">jQuery之家</h1>
```
```
</section>
```

CSS 样式

为页面添加基本样式。

```
body {
```
```
  background-color: #000000;
```
```
  margin: 0;
```
```
  overflow: hidden;
```
```
  font-size: 0;
```
```
}
```
```
body section {
```

  background: url(path/to/background.jpg) no-repeat center center fixed;

```
  -webkit-background-size: cover;
```
```
  -moz-background-size: cover;
```
```
  -o-background-size: cover;
```
```
  background-size: cover;
```
```
  width: 100vw;
```
```
  height: 100vh;
```
```
  font-weight: 700;
```
```
}
```
```
body section canvas {
```
```
  width: 100vw;
```
```
  height: 100vh;
```
```
}
```

Javascript

然后通过下面的 js 代码来生成 canvas 粒子文字和交互动画。

var canvas = document.querySelector("#canvas"),

```
    ctx = canvas.getContext("2d"),
```

    link = document.createElement('link');

```
    particles = [],
```
```
    amount = 0,
```
```
    mouse = { x: -9999, y: -9999 },
```
```
    radius = 1,
```
```
    colors = [
```
```
      "rgba(252,248,254,0.85)", 
```
```
      "rgba(220,203,255,0.75)", 
```
```
      "rgba(154,112,124,0.85)", 
```
```
      "rgba(192,213,255,0.85)", 
```
```
      "rgba(244,223,254,0.75)"
```
```
    ],
```

    headline = document.querySelector("#headline"),

```
    ww = window.innerWidth,
```
```
    wh = window.innerHeight;
```
```
 
```
```
function Particle(x, y) {
```
```
 
```
```
  this.x = Math.random() * ww;
```
```
  this.y = Math.random() * wh;
```
```
  this.dest = { x: x, y: y };
```
```
  this.r = Math.random() * 2 * Math.PI;
```
```
  this.vx = (Math.random() - 0.5) * 25;
```
```
  this.vy = (Math.random() - 0.5) * 25;
```
```
  this.accX = 0;
```
```
  this.accY = 0;
```

  this.friction = Math.random() * 0.025 + 0.94;

  this.color = colors[Math.floor(Math.random() * 2.75)];

```
}
```
```
 
```

Particle.prototype.render = function() {

```
 
```

  this.accX = (this.dest.x - this.x) / 1000;

  this.accY = (this.dest.y - this.y) / 1000;

```
  this.vx += this.accX;
```
```
  this.vy += this.accY;
```
```
  this.vx *= this.friction;
```
```
  this.vy *= this.friction;
```
```
  this.x += this.vx;
```
```
  this.y += this.vy;
```
```
 
```
```
  ctx.fillStyle = this.color;
```
```
  ctx.beginPath();
```

  ctx.arc(this.x, this.y, this.r, Math.PI * 2, false);

```
  ctx.fill();
```
```
 
```
```
  var a = this.x - mouse.x;
```
```
  var b = this.y - mouse.y;
```
```
 
```

  var distance = Math.sqrt(a * a + b * b);

```
  if (distance < (radius * 75)) {
```
```
 
```

    this.accX = (this.x - mouse.x) / 100;

    this.accY = (this.y - mouse.y) / 100;

```
    this.vx += this.accX;
```
```
    this.vy += this.accY;
```
```
  }
```
```
}
```
```
 
```
```
function onMouseMove(e) {
```
```
 
```
```
  mouse.x = e.clientX;
```
```
  mouse.y = e.clientY;
```
```
  }
```
```
 
```
```
  function onTouchMove(e) {
```
```
 
```
```
  if (e.touches.length > 0) {
```
```
 
```
```
    mouse.x = e.touches[0].clientX;
```
```
    mouse.y = e.touches[0].clientY;
```
```
  }
```
```
}
```
```
 
```
```
function onTouchEnd(e) {
```
```
 
```
```
  mouse.x = -9999;
```
```
  mouse.y = -9999;
```
```
}
```
```
 
```
```
function initScene() {
```
```
 
```

  ww = canvas.width = window.innerWidth;

  wh = canvas.height = window.innerHeight;

```
 
```

  ctx.clearRect(0, 0, canvas.width, canvas.height);

```
 
```
```
  link.rel = 'stylesheet';
```
```
  link.type = 'text/css';
```

  link.href = 'https://fonts.googleapis.com/css?family=Abril+Fatface';

  document.getElementsByTagName('head')[0].appendChild(link);

```
 
```

  ctx.font = 'bold 26vw "Abril Fatface"';

```
  ctx.textAlign = "center";
```

  ctx.fillText(headline.innerHTML, ww / 2, wh / 1.6);

```
 
```

  var data = ctx.getImageData(0, 0, ww, wh).data;

```
 
```

  ctx.clearRect(0, 0, canvas.width, canvas.height);

  ctx.globalCompositeOperation = "screen";

```
 
```
```
  particles = [];
```

  for (var i = 0; i < ww; i += Math.round(ww / 200)) {

    for (var j = 0; j < wh; j += Math.round(ww / 200)) {

      if (data[((i + j * ww) * 4) + 3] > 200) {

```
 
```

        particles.push(new Particle(i, j));

```
      }
```
```
    }
```
```
  }
```
```
  amount = particles.length;
```
```
}
```
```
 
```
```
function render(a) {
```
```
 
```
```
  requestAnimationFrame(render);
```

  ctx.clearRect(0, 0, canvas.width, canvas.height);

```
  for (var i = 0; i < amount; i++) {
```
```
 
```
```
    particles[i].render();
```
```
  }
```
```
}
```
```
 
```

headline.addEventListener("keyup", initScene);

window.addEventListener("resize", initScene);

window.addEventListener("mousemove", onMouseMove);

window.addEventListener("touchmove", onTouchMove);

window.addEventListener("touchend", onTouchEnd);

```
initScene();
```
```
requestAnimationFrame(render);
```

官方网址：https://coidea.website/categories/challenges/animated-text-with-particles/

Canvas 的粒子组成文字动画特效

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Canvas的粒子组成文字动画特效

HTML 结构

CSS 样式

Javascript

Canvas 的粒子组成文字动画特效

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