下载SVG作为PNG图像

时间:2022-11-20 18:41:09

I want to download SVG element in my HTML page as a PNG. I tried this but a blank PNG image is downloaded.How to download my HTML SVG as PNG? I used this https://bl.ocks.org/biovisualize/8187844 for converting SVG to PNG but it's not working.How to download SVG in my HTML page as PNG image? My current code is:

我想在我的HTML页面中下载SVG元素作为PNG。我试过这个但是下载了一个空白的PNG图像。如何下载我的HTML SVG作为PNG?我使用这个https://bl.ocks.org/biovisualize/8187844将SVG转换为PNG,但它无法正常工作。如何在我的HTML页面中下载SVG作为PNG图像?我目前的代码是:

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              <tspan class="nl">0.3</tspan>
            </text>
            <text class="ytick" x="71" y="86" transform="translate(0,45.85)" text-anchor="end" style="font-size: 12px; fill: #000000; fill-opacity: 1;">
              <tspan class="nl">0.4</tspan>
            </text>
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        <g class="infolayer">
          <text class="gtitle" data-unformatted="Its All About the Graphs" x="425" y="40" text-anchor="middle" xml:space="preserve" style="font-size: 16.8px; fill: #000000; opacity: 1; pointer-events: all;">Its All About the Graphs</text>
          <text class="xtitle" data-unformatted="Click to enter X axis title" x="425" y="413.2" text-anchor="middle" xml:space="preserve" style="font-size: 14.4px; fill: #000000; opacity: 0; pointer-events: all;">Click to enter X axis title</text>
          <text class="ytitle" data-unformatted="Click to enter Y axis title" x="41.2" y="220" text-anchor="middle" transform="rotate(-90,41.2,220) translate(0, 0)" xml:space="preserve" style="font-size: 14.4px; fill: #000000; opacity: 0; pointer-events: all;">Click to enter Y axis title</text>
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            <g class="traces" transform="translate(1,91.546875)">
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        <g class="hoverlayer"></g>
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    </div>
    <canvas id="canvas" width="800" height="400"></canvas>
    <div id="png-container"></div>
    <script>
      var svgString = new XMLSerializer().serializeToString(document.querySelector('svg'));

      var canvas = document.getElementById("canvas");
      var ctx = canvas.getContext("2d");
      var DOMURL = self.URL || self.webkitURL || self;
      var img = new Image();
      var svg = new Blob([svgString], {type: "image/svg+xml;charset=utf-8"});
      var url = DOMURL.createObjectURL(svg);

      ctx.drawImage(img, 0, 0);

      var imgURL = canvas.toDataURL("image/png");
      DOMURL.revokeObjectURL(imgURL);

      var dlLink = document.createElement('a');
      dlLink.download = "image";
      dlLink.href = imgURL;
      dlLink.dataset.downloadurl = ["image/png", dlLink.download, dlLink.href].join(':');

      document.body.appendChild(dlLink);
      dlLink.click();
      document.body.removeChild(dlLink);
    </script>
  </body>
</html>

2 个解决方案

#1


0  

Use <img> onload event to wait until img load is complete before drawing on canvas

使用下载SVG作为PNG图像 onload事件等到img加载完成后再绘制画布

var svgString = new XMLSerializer()
                .serializeToString(document.querySelector('svg'));
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var DOMURL = self.URL || self.webkitURL || self;
var img = new Image();
var svg = new Blob([svgString], {
  type: "image/svg+xml;charset=utf-8"
});
var url = DOMURL.createObjectURL(svg);
img.onload = function() {
  ctx.drawImage(img, 0, 0);
  var imgURL = canvas.toDataURL("image/png");
   DOMURL.revokeObjectURL(imgURL);
  var dlLink = document.createElement('a');
  dlLink.download = "image";
  dlLink.href = imgURL;
  dlLink.dataset.downloadurl = ["image/png", dlLink.download, dlLink.href]
                              .join(':');
  document.body.appendChild(dlLink);
  dlLink.click();
  document.body.removeChild(dlLink);
}
img.src = url;

plnkr http://plnkr.co/edit/kIpLqlIneR3Qv2ncF5ro?p=preview

#2


0  

    <html>
<head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <script type="text/javascript">

    function download()
    {


img = new Image(),
        serializer = new XMLSerializer(),
        svgStr = serializer.serializeToString(document.getElementById('svg'));

    img.src = 'data:image/svg+xml;base64,'+window.btoa(svgStr);

    // You could also use the actual string without base64 encoding it:
    //img.src = "data:image/svg+xml;utf8," + svgStr;

    var canvas = document.createElement("canvas");

    var w=800;
    var h=400;

    canvas.width = w;
    canvas.height = h;
    canvas.getContext("2d").drawImage(img,0,0,w,h);

    var imgURL = canvas.toDataURL("image/png");


var dlLink = document.createElement('a');
    dlLink.download = "image";
    dlLink.href = imgURL;
    dlLink.dataset.downloadurl = ["image/png", dlLink.download, dlLink.href].join(':');

    document.body.appendChild(dlLink);
    dlLink.click();
    document.body.removeChild(dlLink);
    }

    </script>
</head>
<body>
<div id="svg-container">
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fill: #337fb9; fill-opacity: 1;"></path><path class="js-line" d="M5,0h30" style="stroke-width: 2px; stroke: #337fb9; stroke-opacity: 0.7; fill: none;"></path></g><text class="legendtext text-3" x="40" y="4.65625" data-unformatted="Blue Lemon" xml:space="preserve" style="text-anchor: start; font-size: 12px; fill: #000000; opacity: 1; pointer-events: all;">Blue Lemon</text></g><g class="traces" transform="translate(1,91.546875)"><g class="legendsymbols" style="opacity: 1;"><g class="legendpoints"></g><path class="js-fill" data-curve="4" d="M5,0h30v6h-30z" style="stroke-width: 0px; fill: #a4477d; fill-opacity: 1;"></path><path class="js-line" d="M5,0h30" style="stroke-width: 2px; stroke: #a4477d; stroke-opacity: 0.7; fill: none;"></path></g><text class="legendtext text-4" x="40" y="4.65625" data-unformatted="Persia" xml:space="preserve" style="text-anchor: start; font-size: 12px; fill: #000000; opacity: 1; pointer-events: all;">Persia</text></g></svg></g><g class="hoverlayer"></g></svg>
</div>
<button onclick="download()">Download</button>
</body>
</html>

#1


0  

Use <img> onload event to wait until img load is complete before drawing on canvas

使用下载SVG作为PNG图像 onload事件等到img加载完成后再绘制画布

var svgString = new XMLSerializer()
                .serializeToString(document.querySelector('svg'));
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var DOMURL = self.URL || self.webkitURL || self;
var img = new Image();
var svg = new Blob([svgString], {
  type: "image/svg+xml;charset=utf-8"
});
var url = DOMURL.createObjectURL(svg);
img.onload = function() {
  ctx.drawImage(img, 0, 0);
  var imgURL = canvas.toDataURL("image/png");
   DOMURL.revokeObjectURL(imgURL);
  var dlLink = document.createElement('a');
  dlLink.download = "image";
  dlLink.href = imgURL;
  dlLink.dataset.downloadurl = ["image/png", dlLink.download, dlLink.href]
                              .join(':');
  document.body.appendChild(dlLink);
  dlLink.click();
  document.body.removeChild(dlLink);
}
img.src = url;

plnkr http://plnkr.co/edit/kIpLqlIneR3Qv2ncF5ro?p=preview

#2


0  

    <html>
<head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <script type="text/javascript">

    function download()
    {


img = new Image(),
        serializer = new XMLSerializer(),
        svgStr = serializer.serializeToString(document.getElementById('svg'));

    img.src = 'data:image/svg+xml;base64,'+window.btoa(svgStr);

    // You could also use the actual string without base64 encoding it:
    //img.src = "data:image/svg+xml;utf8," + svgStr;

    var canvas = document.createElement("canvas");

    var w=800;
    var h=400;

    canvas.width = w;
    canvas.height = h;
    canvas.getContext("2d").drawImage(img,0,0,w,h);

    var imgURL = canvas.toDataURL("image/png");


var dlLink = document.createElement('a');
    dlLink.download = "image";
    dlLink.href = imgURL;
    dlLink.dataset.downloadurl = ["image/png", dlLink.download, dlLink.href].join(':');

    document.body.appendChild(dlLink);
    dlLink.click();
    document.body.removeChild(dlLink);
    }

    </script>
</head>
<body>
<div id="svg-container">
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