robert
/
xjs


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>SVG Motion Path - Animal.js</title>
  <link rel="stylesheet" href="../demo.css">
  <style>
    .demo-visual {
      padding: 26px 30px;
      background: #151515;
      display: grid;
      grid-template-columns: 1fr 280px;
      gap: 16px;
    }
    .stage {
      background: rgba(0,0,0,0.25);
      border: 1px solid #262626;
      border-radius: 12px;
      padding: 14px;
      overflow: hidden;
      min-height: 220px;
      display: grid;
      place-items: center;
    }
    .panel {
      background: rgba(0,0,0,0.18);
      border: 1px solid #262626;
      border-radius: 12px;
      padding: 14px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    svg { width: 100%; height: 100%; max-height: 260px; }
    .path {
      fill: none;
      stroke: rgba(255,255,255,0.12);
      stroke-width: 2.2;
      stroke-linecap: round;
      stroke-linejoin: round;
    }
    .runner {
      fill: var(--accent-color);
      filter: drop-shadow(0 0 8px rgba(255,159,67,0.25));
    }
  </style>
</head>
<body>
  <div class="container">
    <div class="page-top">
      <div class="crumb">ANIMATION › SVG</div>
      <div class="since">SINCE 1.0.0</div>
    </div>

    <h1>沿路径运动（Motion Path）</h1>
    <p class="description">让一个小点沿着 path 跑：像小飞机巡航、像精灵带路、像 UI 的“引导线”。</p>

    <div class="box-container">
      <div class="demo-visual">
        <div class="stage">
          <svg viewBox="0 0 320 180">
            <path id="track" class="path" d="M18,142 C62,14 142,12 176,90 C204,154 262,166 300,42" />
            <g id="runner" transform="translate(18 142)">
              <circle class="runner" cx="0" cy="0" r="10"></circle>
            </g>
          </svg>
        </div>
        <div class="panel">
          <button class="play-btn" onclick="runDemo()">REPLAY</button>
        </div>
      </div>
    </div>

    <script src="../page_utils.js"></script>
    <script src="../../xjs.js"></script>
    <script>
      const path = document.getElementById('track');
      const runner = document.getElementById('runner');
      
      function runDemo() {
        const len = path.getTotalLength();
        xjs({ p: 0 }).animate({
          p: [0, 1],
          duration: 1400,
          easing: 'ease-in-out',
          update: ({ progress }) => {
            const pt = path.getPointAtLength(len * progress);
            runner.setAttribute('transform', `translate(${pt.x} ${pt.y})`);
          }
        });
      }
      
      setTimeout(runDemo, 320);
    </script>
  </div>
</body>
</html>