gsap实现三角形圆动画变化效果-html代码-BFW代码库

gsap实现三角形圆动画变化效果

代码语言：html

所属分类：动画

代码描述：gsap实现三角形圆动画变化效果

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>
html,
body {
  margin: 0;
  padding: 0;
}

body {
  width: 100vw;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  background: #fff;
}

canvas {
  border-radius: 50%;
}
</style>

</head>
<body translate="no">
<script type="text/javascript" src="http://repo.bfw.wiki/bfwrepo/js/gsap.3.3.1.js"></script>
<script>
const size = 500;
const mid = { x: size * 0.5, y: size * 0.5 };
const tau = Math.PI * 2;

const ctxs = new Array(3).fill().map((_, i) => {
  const c = document.createElement('canvas');

  c.width = size;
  c.height = size;

  return c.getContext('2d');
});

const [ctx, ctx2, ctx3] = ctxs;

document.body.append(ctx3.canvas);

const settings = {
  innerBackgroudColor: 'rgba(0, 0, 0, 1)',
  innerRadius: size * 0.2,
  innerPoints: 12,
  innerLineColor: 'rgba(255, 255, 255, 1)',
  outerBackgroundColor: 'rgba(255, 255, 255, 1)',
  outerRadius: size * 0.45,
  outerPoints: 8,
  outerLineColor: 'rgba(0, 0, 0, 1)',
  outerSpread: tau,
  maskOuterRadius: 0,
  maskInnerRadius: 0,
};

ctx.canvas.width = size;
ctx.canvas.height = size;

const clear = () => {
  ctxs.forEach(c => c.clearRect(0, 0, c.canvas.width, c.canvas.height));
};

const background = () => {
  ctx.fillStyle = '#fff';

  ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height)
};

const drawInner = (points, color = '#000') => {
  ctx.save();
  ctx.translate(mid.x, mid.y);
  ctx.strokeStyle = settings.innerBackgroudColor;
  ctx.fillStyle = settings.innerBackgroudColor;

  ctx.beginPath();
  ctx.arc(0, 0, settings.innerRadius, 0, tau, false);
  ctx.closePath();
  ctx.fill();

  points.forEach((p) => {
    ctx.beginPath();
    ctx.arc(p.x, p.y, 3, 0, tau, false);
    ctx.closePath();
    ctx.fill();
  });

  ctx.restore();
};

const drawOuter = (dest, innerPoints, lineColor = '#000') => {
  for (let i = 0; i < settings.outerPoints; i++) {
    const a = ((settings.outerSpread / settings.outerPoints) * i);

    const from = {
      x: Math.cos(a) * settings.outerRadius,
      y: Math.sin(a) * settings.outerRadius,
    };

    connectDots(dest, from, innerPoints, lineColor);
  }
};

const connectDots = (dest, from, points, lineColor) => {
  dest.save();
  dest.translate(mid.x, mid.y);

  dest.strokeStyle = lineColor;
  dest.lineWidth = 1;
.........完整代码请登录后点击上方下载按钮下载查看