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 Attributes - Animal.js</title>
  <link rel="stylesheet" href="../demo.css">
  <style>
    .hint {
      color: #9a9a9a;
      font-size: 12px;
      line-height: 1.65;
      margin-top: -8px;
      margin-bottom: 16px;
    }
    .demo-visual {
      padding: 26px 30px;
      background: #151515;
      display: grid;
      grid-template-columns: 1fr 280px;
      gap: 16px;
      align-items: stretch;
    }
    .stage {
      background: rgba(0,0,0,0.25);
      border: 1px solid #262626;
      border-radius: 12px;
      padding: 14px;
      overflow: hidden;
      position: relative;
      min-height: 240px;
      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;
      justify-content: space-between;
    }
    .control {
      display: grid;
      grid-template-columns: 90px 1fr 64px;
      gap: 10px;
      align-items: center;
    }
    .control label { color: #bdbdbd; font-size: 12px; font-weight: 800; }
    .control output { color: #e6e6e6; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 12px; }
    input[type="range"] { width: 100%; }

    svg { width: 100%; height: 100%; max-height: 280px; }
    .bg {
      fill: rgba(255,255,255,0.02);
      stroke: rgba(255,255,255,0.06);
      stroke-width: 1;
    }
    .ring { fill: none; stroke: rgba(255,255,255,0.14); stroke-width: 8; }
    .ring.orange { stroke: var(--accent-color); filter: drop-shadow(0 0 10px rgba(255,159,67,0.18)); }
    .ring.red { stroke: var(--highlight-color); filter: drop-shadow(0 0 10px rgba(255,75,75,0.16)); }
    .dot { fill: rgba(255,255,255,0.18); }
  </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>SVG 属性动画（cx / r / …）</h1>
    <p class="description">
      SVG 很多“形状”都由属性控制（比如 <code class="inline">cx</code>、<code class="inline">r</code>、<code class="inline">strokeDashoffset</code>）。
      这类属性不一定走 WAAPI，但 <code class="inline">xjs().animate()</code> 仍然能动画它们（会走 JS fallback）。
    </p>
    <p class="hint">
      <strong>直觉理解：</strong>“CSS 属性”是写到 style 的；而 SVG 的很多东西是写在 attribute 上的。<br>
      在本库里：同一套写法，内部会决定用 WAAPI 还是 JS 去更新。
    </p>

    <div class="box-container">
      <div class="box-header">
        <div class="box-title">SVG attributes code example</div>
        <div class="box-right">
          <button class="icon-btn" type="button" title="Copy" onclick="DocPage.copyActiveCode()" aria-label="Copy code">
            <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
              <rect x="9" y="9" width="13" height="13" rx="2"></rect>
              <path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"></path>
            </svg>
          </button>
          <div class="tabs" role="tablist" aria-label="Code tabs">
            <div class="tab active" role="tab" aria-selected="true" tabindex="0" onclick="DocPage.switchTab('js')">JavaScript</div>
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          </div>
        </div>
      </div>

      <div id="js-code" class="code-view active">
<span class="fun">xjs</span><span class="punc">(</span><span class="str">'#c1'</span><span class="punc">)</span>.<span class="fun">animate</span><span class="punc">({</span>
  cx<span class="punc">:</span> <span class="punc">[</span><span class="num">96</span><span class="punc">,</span> <span class="num">224</span><span class="punc">]</span><span class="punc">,</span>
  r<span class="punc">:</span> <span class="punc">[</span><span class="num">14</span><span class="punc">,</span> <span class="num">34</span><span class="punc">]</span><span class="punc">,</span>
  duration<span class="punc">:</span> <span class="num">900</span><span class="punc">,</span>
  direction<span class="punc">:</span> <span class="str">'alternate'</span><span class="punc">,</span>
  loop<span class="punc">:</span> <span class="num">2</span>
<span class="punc">}</span><span class="punc">)</span><span class="punc">;</span>
      </div>

      <div id="html-code" class="html-view">
<span class="tag">&lt;circle</span> <span class="attr">id</span>=<span class="val">"c1"</span> <span class="attr">cx</span>=<span class="val">"96"</span> <span class="attr">cy</span>=<span class="val">"90"</span> <span class="attr">r</span>=<span class="val">"14"</span> <span class="tag">/&gt;</span>
      </div>

      <pre id="css-code" class="css-view">.ring.orange { stroke: var(--accent-color); }
.ring.red { stroke: var(--highlight-color); }</pre>

      <div class="feature-desc">
        <strong>功能说明：</strong>
        <br>- 对 SVG 元素来说，“不是 transform / opacity / filter 的属性”，通常会走 JS 更新属性值。
        <br>- 这让你能直接动画 <code class="inline">cx</code>、<code class="inline">r</code>、<code class="inline">strokeWidth</code> 等等。
      </div>

      <div class="demo-visual">
        <div class="stage">
          <svg viewBox="0 0 320 220" aria-label="SVG attributes demo">
            <rect class="bg" x="16" y="16" width="288" height="188" rx="14"></rect>
            <circle class="ring" cx="160" cy="110" r="70"></circle>
            <circle id="c1" class="ring orange" cx="96" cy="90" r="14"></circle>
            <circle id="c2" class="ring red" cx="224" cy="130" r="22"></circle>
            <circle class="dot" cx="160" cy="110" r="2"></circle>
          </svg>
        </div>
        <div class="panel">
          <div>
            <div class="control">
              <label for="amp">amplitude</label>
              <input id="amp" type="range" min="20" max="120" step="5" value="70" />
              <output id="ampOut">70</output>
            </div>
            <div class="control">
              <label for="dur">duration</label>
              <input id="dur" type="range" min="200" max="2400" step="50" value="900" />
              <output id="durOut">900ms</output>
            </div>
          </div>
          <div style="display:flex; gap:10px; justify-content:flex-end;">
            <button class="play-btn secondary" onclick="pauseDemo()">PAUSE</button>
            <button class="play-btn secondary" onclick="resumeDemo()">RESUME</button>
            <button class="play-btn" onclick="runDemo()">REPLAY</button>
          </div>
        </div>
      </div>
    </div>

    <div class="doc-nav" aria-label="Previous and next navigation">
      <a href="#" onclick="goPrev(); return false;">
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      </a>
      <div id="nav-center" class="nav-center">SVG</div>
      <a href="#" onclick="goNext(); return false;">
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  </div>

  <div id="toast" class="toast" role="status" aria-live="polite"></div>

  <script src="../page_utils.js"></script>
  <script src="../../xjs.js"></script>
  <script>
    const CURRENT = 'svg/test_svg_attributes.html';
    let __ctls = [];

    const c1 = document.getElementById('c1');
    const c2 = document.getElementById('c2');
    const amp = document.getElementById('amp');
    const dur = document.getElementById('dur');
    const ampOut = document.getElementById('ampOut');
    const durOut = document.getElementById('durOut');

    function read() {
      const a = Number(amp.value);
      const d = Number(dur.value);
      ampOut.textContent = String(a);
      durOut.textContent = d + 'ms';
      return { a, d };
    }

    function reset() {
      const prev = __ctls || [];
      prev.forEach(c => { try { c?.cancel?.(); } catch {} });
      __ctls = [];
      c1.setAttribute('cx', '96'); c1.setAttribute('cy', '90'); c1.setAttribute('r', '14');
      c2.setAttribute('cx', '224'); c2.setAttribute('cy', '130'); c2.setAttribute('r', '22');
    }

    function runDemo() {
      reset();
      const { a, d } = read();
      // Two circles cross & breathe (separate controls; library doesn't support per-target function values here)
      __ctls.push(xjs(c1).animate({
        cx: [96, 160 + a],
        cy: [90, 110 - a * 0.2],
        r: [14, 24],
        duration: d,
        easing: 'ease-in-out',
        direction: 'alternate',
        loop: 2
      }));
      __ctls.push(xjs(c2).animate({
        cx: [224, 160 - a],
        cy: [130, 110 + a * 0.2],
        r: [22, 14],
        duration: d,
        easing: 'ease-in-out',
        direction: 'alternate',
        loop: 2
      }));
    }

    function pauseDemo() { (__ctls || []).forEach(c => { try { c?.pause?.(); } catch {} }); }
    function resumeDemo() { (__ctls || []).forEach(c => { try { c?.play?.(); } catch {} }); }

    amp.addEventListener('input', read);
    dur.addEventListener('input', read);

    function goPrev() { window.parent?.docNavigatePrev?.(CURRENT); }
    function goNext() { window.parent?.docNavigateNext?.(CURRENT); }

    DocPage.enableTabKeyboardNav();
    DocPage.syncMiddleActive(CURRENT);
    DocPage.syncPrevNext(CURRENT);
    read();
    setTimeout(runDemo, 320);
  </script>
</body>
</html>