[SVG] clip path

Blog/etc.
[SVG] clip path

나나 (nykim) 2019. 9. 17. 18:13
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    html,
    body {
      height: 100%;
      margin: 0;
    }

    body {
      font-family: Monaco;
      font-size: 12px;
      color: rgba(0, 0, 0, .7);
    }

    svg {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      display: block;
      width: 100%;
      height: 100%;
    }
  </style>
</head>

<body>

  <!-- 기본 이미지 -->
  <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <rect width="100%" height="100%" fill="#E7E7E8" />
    <image id="image" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="./pack1.png" width="100%" height="100%" />
  </svg>


  <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <defs>
      <clipPath id="myClipPath">
        <circle id="circle" cx="50%" cy="50%" r="10%" style="fill: red" />
        <!-- 이 circle 바깥쪽에 있는 건 클립되서 안 보임!! -->
      </clipPath>
    </defs>
    <g clip-path="url(#myClipPath)">
      <rect width="100%" height="100%" fill="#272730" />
      <image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="./pack2.png" width="100%" height="100%" />
    </g>
    <circle id="shadow" cx="50%" cy="50%" r="10%"
      style="stroke: rgb(183, 113, 240); fill: transparent; stroke-width: 5;" />
  </svg>


  <script>
    var svgElem = document.querySelector("svg");
    var maskedElem = document.querySelector("#circle");
    var shadow = document.querySelector("#shadow");
    var svgPoint = svgElem.createSVGPoint();



    function cursorPoint(e) {
      svgPoint.x = e.clientX;
      svgPoint.y = e.clientY;
      return svgPoint;
      // return svgPoint.matrixTransform(svgElem.getScreenCTM().inverse());
    }

    function update(svgCoords) {
      maskedElem.setAttribute('cx', svgCoords.x);
      maskedElem.setAttribute('cy', svgCoords.y);
      shadow.setAttribute('cx', svgCoords.x);
      shadow.setAttribute('cy', svgCoords.y);
    }

    window.addEventListener('mousemove', function (e) {
      update(cursorPoint(e));
    }, false);

    document.addEventListener('touchmove', function (e) {
      e.preventDefault();
      var touch = e.targetTouches[0];
      if (touch) {
        update(cursorPoint(touch));
      }
    }, false);
  </script>
</body>

</html>
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