javascript - 尝试将 SVG 绘制到 Canvas ，为什么我的 SVG XML 被 chop 了？

Question

我真正想做的就是将我喜欢的动态创建的 SVG 放入 PDF 中，目前通过 jsPDF。 addSVG 不起作用，所以我尝试将它们转换为 PNG，以便尝试使用 addImage。

这是在 IE11 中(客户端要求)。

如果我这样做:

var lsvg = d3.select("#nowhere2").node().parentNode.innerHTML;
console.log(lsvg);

也许三分之一的 SVG 显示在控制台中。更奇怪的是，它会在事物的中间 chop ，因此没有结束标记或其他任何内容:

<div id="nowhere2"><svg xmlns="http://www.w3.org/2000/svg" width="50px" height="800px"><defs><pattern id="oaghm" patternUnits="userSpaceOnUse" width="30" height="30"><path stroke="#343434" stroke-linecap="square" stroke-width="80" d="M 0 30 l 30 -30 M -7.5 7.5 l 15 -15 M 22.5 37.5 l 15 -15" shape-rendering="auto" /></pattern></defs><rect style="fill: url(#oaghm);" stroke="black" x="10" y="20" width="10" height="10" /><defs><pattern id="zpdff" patternUnits="userSpaceOnUse" width="4" height="4"><path stroke="#343434" stroke-linecap="square" stroke-width="1" d="M 0 4 l 4 -4 M -1 1 l 2 -2 M 3 5 l 2 -2" shape-rendering="auto" /></pattern></defs><rect style="fill: url(#zpdff);" stroke="black" x="10" y="40" width="10" height="10" /><defs><pattern id="dyxwi" patternUnits="userSpaceOnUse" width="10" height="10"><path stroke="#343434" stroke-linecap="square" stroke-width="2" d="M 0 10 l 10 -10 M -2.5 2.5 l 5 -5 M 7.5 12.5 l 5 -5" shape-rendering="auto" /><path stroke="#343434" stroke-linecap="square" stroke-width="2" d

当然，这意味着我的 DataURI 坏了，尽管 Chrome 勇敢地尝试了(仅用于测试，必须使用 IE11):

data:image/svg+xml;base64,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

更奇怪的是，如果我简单地将 lsvg 对象追加回页面，它呈现得很好。

var lsvg = d3.select("#nowhere2").node().parentNode.innerHTML;
$("#nowhere").append(lsvg);

如果我在附加后尝试在控制台中检查它，我会得到相同的 chop 字符串。当然，这让我相信这是一个时间/异步问题，但我已经尝试了所有我能想到的方法来解决这个问题，包括设置 draw-to-canvas-then-save-to-png 函数作为我最初的 SVG 绘制函数的回调。我每次都得到相同的奇怪 chop 字符串。

这是我的 Canvas (由于其他问题在 html 中声明):

<canvas id="lcanvas" width="50" height="800"></canvas>

研究让我相信这可能是 Canvas /SVG 大小不匹配，但情况似乎并非如此(我得到的 SVG 显示相同的宽度/高度，见上文)。此外，如果这是真的，它甚至会在 Canvas 涉及之前 chop 初始字符串分配，这似乎很奇怪。

有一次我得到了完整的 DataURI:

data:image/svg+xml;base64,PGRpdiBpZD0ibm93aGVyZTIiPjxzdmcgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIiB3aWR0aD0iNTAiIGhlaWdodD0iODAwIj48ZGVmcz48cGF0dGVybiBpZD0iZmxhY3EiIHBhdHRlcm5Vbml0cz0idXNlclNwYWNlT25Vc2UiIHdpZHRoPSIzMCIgaGVpZ2h0PSIzMCI+PHBhdGggc3Ryb2tlPSIjMzQzNDM0IiBzdHJva2UtbGluZWNhcD0ic3F1YXJlIiBzdHJva2Utd2lkdGg9IjgwIiBkPSJNIDAgMzAgbCAzMCAtMzAgTSAtNy41IDcuNSBsIDE1IC0xNSBNIDIyLjUgMzcuNSBsIDE1IC0xNSIgc2hhcGUtcmVuZGVyaW5nPSJhdXRvIiAvPjwvcGF0dGVybj48L2RlZnM+PHJlY3Qgc3R5bGU9ImZpbGw6IHVybCgjZmxhY3EpOyIgc3Ryb2tlPSJibGFjayIgeD0iMTAiIHk9IjIwIiB3aWR0aD0iMTAiIGhlaWdodD0iMTAiIC8+PGRlZnM+PHBhdHRlcm4gaWQ9InV5b3JkIiBwYXR0ZXJuVW5pdHM9InVzZXJTcGFjZU9uVXNlIiB3aWR0aD0iNCIgaGVpZ2h0PSI0Ij48cGF0aCBzdHJva2U9IiMzNDM0MzQiIHN0cm9rZS1saW5lY2FwPSJzcXVhcmUiIHN0cm9rZS13aWR0aD0iMSIgZD0iTSAwIDQgbCA0IC00IE0gLTEgMSBsIDIgLTIgTSAzIDUgbCAyIC0yIiBzaGFwZS1yZW5kZXJpbmc9ImF1dG8iIC8+PC9wYXR0ZXJuPjwvZGVmcz48cmVjdCBzdHlsZT0iZmlsbDogdXJsKCN1eW9yZCk7IiBzdHJva2U9ImJsYWNrIiB4PSIxMCIgeT0iNDAiIHdpZHRoPSIxMCIgaGVpZ2h0PSIxMCIgLz48ZGVmcz48cGF0dGVybiBpZD0iZ2VoYW8iIHBhdHRlcm5Vbml0cz0idXNlclNwYWNlT25Vc2UiIHdpZHRoPSIxMCIgaGVpZ2h0PSIxMCI+PHBhdGggc3Ryb2tlPSIjMzQzNDM0IiBzdHJva2UtbGluZWNhcD0ic3F1YXJlIiBzdHJva2Utd2lkdGg9IjIiIGQ9Ik0gMCAxMCBsIDEwIC0xMCBNIC0yLjUgMi41IGwgNSAtNSBNIDcuNSAxMi41IGwgNSAtNSIgc2hhcGUtcmVuZGVyaW5nPSJhdXRvIiAvPjxwYXRoIHN0cm9rZT0iIzM0MzQzNCIgc3Ryb2tlLWxpbmVjYXA9InNxdWFyZSIgc3Ryb2tlLXdpZHRoPSIyIiBkPSJNIDAgMCBsIDEwIDEwIE0gLTIuNSA3LjUgbCA1IDUgTSA3LjUgLTIuNSBsIDUgNSIgc2hhcGUtcmVuZGVyaW5nPSJhdXRvIiAvPjwvcGF0dGVybj48L2RlZnM+PHJlY3Qgc3R5bGU9ImZpbGw6IHVybCgjZ2VoYW8pOyIgc3Ryb2tlPSJibGFjayIgeD0iMTAiIHk9IjYwIiB3aWR0aD0iMTAiIGhlaWdodD0iMTAiIC8+PGRlZnM+PHBhdHRlcm4gaWQ9InZpYWNpIiBwYXR0ZXJuVW5pdHM9InVzZXJTcGFjZU9uVXNlIiB3aWR0aD0iMTAiIGhlaWdodD0iMTAiPjxwYXRoIHN0cm9rZT0iIzM0MzQzNCIgc3Ryb2tlLWxpbmVjYXA9InNxdWFyZSIgc3Ryb2tlLXdpZHRoPSIyIiBkPSJNIDAgNSBsIDEwIDAiIHNoYXBlLXJlbmRlcmluZz0iYXV0byIgLz48cGF0aCBzdHJva2U9IiMzNDM0MzQiIHN0cm9rZS1saW5lY2FwPSJzcXVhcmUiIHN0cm9rZS13aWR0aD0iMiIgZD0iTSA1IDAgbCAwIDEwIiBzaGFwZS1yZW5kZXJpbmc9ImF1dG8iIC8+PC9wYXR0ZXJuPjwvZGVmcz48cmVjdCBzdHlsZT0iZmlsbDogdXJsKCN2aWFjaSk7IiBzdHJva2U9ImJsYWNrIiB4PSIxMCIgeT0iODAiIHdpZHRoPSIxMCIgaGVpZ2h0PSIxMCIgLz48ZGVmcz48cGF0dGVybiBpZD0ic2d2eGoiIHBhdHRlcm5Vbml0cz0idXNlclNwYWNlT25Vc2UiIHdpZHRoPSIxMCIgaGVpZ2h0PSIxMCI+PGNpcmNsZSBmaWxsPSIjMzQzNDM0IiBzdHJva2U9IiMzNDM0MzQiIHN0cm9rZS13aWR0aD0iMCIgY3g9IjUiIGN5PSI1IiByPSI0IiAvPjwvcGF0dGVybj48L2RlZnM+PHJlY3Qgc3R5bGU9ImZpbGw6IHVybCgjc2d2eGopOyIgc3Ryb2tlPSJibGFjayIgeD0iMTAiIHk9IjEwMCIgd2lkdGg9IjEwIiBoZWlnaHQ9IjEwIiAvPjxkZWZzPjxwYXR0ZXJuIGlkPSJybHFreCIgcGF0dGVyblVuaXRzPSJ1c2VyU3BhY2VPblVzZSIgd2lkdGg9IjEwIiBoZWlnaHQ9IjEwIj48cGF0aCBzdHJva2U9IiMzNDM0MzQiIHN0cm9rZS1saW5lY2FwPSJzcXVhcmUiIHN0cm9rZS13aWR0aD0iMiIgZD0iTSAwIDUgbCAxMCAwIiBzaGFwZS1yZW5kZXJpbmc9ImF1dG8iIC8+PC9wYXR0ZXJuPjwvZGVmcz48cmVjdCBzdHlsZT0iZmlsbDogdXJsKCNybHFreCk7IiBzdHJva2U9ImJsYWNrIiB4PSIxMCIgeT0iMTIwIiB3aWR0aD0iMTAiIGhlaWdodD0iMTAiIC8+PGRlZnM+PHBhdHRlcm4gaWQ9Im1qbm5mIiBwYXR0ZXJuVW5pdHM9InVzZXJTcGFjZU9uVXNlIiB3aWR0aD0iNSIgaGVpZ2h0PSI1Ij48cGF0aCBzdHJva2U9IiMzNDM0MzQiIHN0cm9rZS1saW5lY2FwPSJzcXVhcmUiIHN0cm9rZS13aWR0aD0iMSIgZD0iTSAwIDAgbCA1IDUgTSAtMS4yNSAzLjc1IGwgMi41IDIuNSBNIDMuNzUgLTEuMjUgbCAyLjUgMi41IiBzaGFwZS1yZW5kZXJpbmc9ImF1dG8iIC8+PC9wYXR0ZXJuPjwvZGVmcz48cmVjdCBzdHlsZT0iZmlsbDogdXJsKCNtam5uZik7IiBzdHJva2U9ImJsYWNrIiB4PSIxMCIgeT0iMTQwIiB3aWR0aD0iMTAiIGhlaWdodD0iMTAiIC8+PGRlZnM+PHBhdHRlcm4gaWQ9ImJseXJqIiBwYXR0ZXJuVW5pdHM9InVzZXJTcGFjZU9uVXNlIiB3aWR0aD0iMTAiIGhlaWdodD0iMTAiPjxwYXRoIHN0cm9rZT0iIzM0MzQzNCIgc3Ryb2tlLWxpbmVjYXA9InNxdWFyZSIgc3Ryb2tlLXdpZHRoPSIyIiBkPSJNIDAgNSBsIDEwIDAiIHNoYXBlLXJlbmRlcmluZz0iYXV0byIgLz48cGF0aCBzdHJva2U9IiMzNDM0MzQiIHN0cm9rZS1saW5lY2FwPSJzcXVhcmUiIHN0cm9rZS13aWR0aD0iMiIgZD0iTSA1IDAgbCAwIDEwIiBzaGFwZS1yZW5kZXJpbmc9ImF1dG8iIC8+PC9wYXR0ZXJuPjwvZGVmcz48cmVjdCBzdHlsZT0iZmlsbDogdXJsKCNibHlyaik7IiBzdHJva2U9ImJsYWNrIiB4PSIxMCIgeT0iMTYwIiB3aWR0aD0iMTAiIGhlaWdodD0iMTAiIC8+PGRlZnM+PHBhdHRlcm4gaWQ9ImhieHVwIiBwYXR0ZXJuVW5pdHM9InVzZXJTcGFjZU9uVXNlIiB3aWR0aD0iNSIgaGVpZ2h0PSI1Ij48Y2lyY2xlIGZpbGw9IiMzNDM0MzQiIHN0cm9rZT0iIzM0MzQzNCIgc3Ryb2tlLXdpZHRoPSIwIiBjeD0iMi41IiBjeT0iMi41IiByPSIyIiAvPjwvcGF0dGVybj48L2RlZnM+PHJlY3Qgc3R5bGU9ImZpbGw6IHVybCgjaGJ4dXApOyIgc3Ryb2tlPSJibGFjayIgeD0iMTAiIHk9IjE4MCIgd2lkdGg9IjEwIiBoZWlnaHQ9IjEwIiAvPjwvc3ZnPjwvZGl2Pg==

所以我明确地使用该 DataURI 对其进行了测试，换句话说，不用担心绘图是否已经完成。我做了:

limg.src = "data:image/svg+xml;base64,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";
console.log(limg.src);

并且在控制台中是一样的。爆炸了。 chop 。字符串。这是我的代码:

        var lsvg = d3.select("#nowhere2").node().parentNode.innerHTML;
        console.log(lsvg);

        var limg = new Image;
        var lcontext = canl.getContext('2d');

        limg.src = 'data:image/svg+xml;base64,' + btoa(lsvg);

        console.log(limg.src);
        lcontext.load = limg.addEventListener("load", function () {
            //console.log(limg.src);
            //This fun bit of code brought to you courtesy of IE11.
            try {
                lcontext.drawImage(limg, 0, 0);
            }
            catch (err) {
                setTimeout(lcontext.drawImage(limg, 0, 0), 0);
            };
            console.log(canl.toDataURL('image/png'));
        });

我让 Canvas 可见，这样我就可以看到可能会发生什么样的恶作剧。它会很好地从文件中绘制图像。另外，从技术上讲，我在这里得到了一张图片，它只是空白的。

我不想从文件中绘制，因为这会污染 Canvas 并且我在 canl.toDataURL 上收到安全错误。

我尝试了各种获取 lsvg 位、XMLSerialize 等的方法；我得到的只是稍微短一点的头部(没有 div 元素)和稍微长一点的尾部，然后在似乎完全相同的字符数之后被 chop 。像往常一样，就在事情的中间，所以仍然没有结束标签，只是中途突然结束。

需要说明的是，这不是裁剪后的 SVG。这是一个“剪裁”的 SVG。开始标签，没有结束标签，损坏的图像，除非你是 Chrome 并且你尝试渲染它(IE 甚至不会打扰)。 SVG 在涉及 Canvas 之前就被破坏了，甚至在显式分配后独立于绘图函数。

哦，亲爱的正义，我有一把 fiddle ! https://jsfiddle.net/94xhyv6t/在 Chrome 和 IE 中尝试并检查控制台。在 Chrome 中，如果您单击该链接，您将获得一个 XML 页面，但您可以在那里看到所有 SVG 元素，在 IE 中，它被 chop 了。

很高兴知道我还没有完全疯掉。

只是因为我知道有人会提到它，这是没有父 DIV 节点的:https://jsfiddle.net/94xhyv6t/1/同样的问题。

---

编辑:注意:这个 fiddle 显示了问题:https://jsfiddle.net/94xhyv6t/1/ .在 Chrome 中加载它，一切正常。在 IE11 中加载它，一切都被 chop 了。我删除了所有其他代码，这个 fiddle 只显示了 SVG 字符串生成组件以及它是如何在 IE 中被 chop 的。我已经根据 https://jsfiddle.net/94xhyv6t/4/ 尝试过 XMLSerializer ，同样的问题。也许有解决方法？

---

目前的最后编辑:控制台只是 chop 显示，否则字符串没问题。接受的答案有一个完整的 fiddle 示例，展示了如何将 SVG 放入 Canvas 中，但是你不能在 IE11 中执行 canvas.toDataURL() 所以这不是合适的转换方法。我使用 canvg 作为解决方法。

Answer 1

不知道你的问题到底是什么，但是使用

var data = new XMLSerializer().serializeToString(document.querySelector('svg'));
img.src = 'data:image/svg+xml; charset=utf8, ' + encodeURIComponent(data);

适用于 FF 和 Chrome。

var n = 20, // number of layers
    m = 200, // number of samples per layer
    stack = d3.layout.stack().offset("wiggle"),
    layers0 = stack(d3.range(n).map(function() { return bumpLayer(m); })),
    layers1 = stack(d3.range(n).map(function() { return bumpLayer(m); }));

var width = 960,
    height = 500;

var x = d3.scale.linear()
    .domain([0, m - 1])
    .range([0, width]);

var y = d3.scale.linear()
    .domain([0, d3.max(layers0.concat(layers1), function(layer) { return d3.max(layer, function(d) { return d.y0 + d.y; }); })])
    .range([height, 0]);

var color = d3.scale.linear()
    .range(["#aad", "#556"]);

var area = d3.svg.area()
    .x(function(d) { return x(d.x); })
    .y0(function(d) { return y(d.y0); })
    .y1(function(d) { return y(d.y0 + d.y); });

var svg = d3.select("#worm").append("svg")
    .attr("width", width)
    .attr("height", height);

svg.selectAll("path")
    .data(layers0)
  .enter().append("path")
    .attr("d", area)
    .style("fill", function() { return color(Math.random()); });

function transition() {
  d3.selectAll("path")
      .data(function() {
        var d = layers1;
        layers1 = layers0;
        return layers0 = d;
      })
    .transition()
      .duration(2500)
      .attr("d", area);
}

// Inspired by Lee Byron's test data generator.
function bumpLayer(n) {

  function bump(a) {
    var x = 1 / (.1 + Math.random()),
        y = 2 * Math.random() - .5,
        z = 10 / (.1 + Math.random());
    for (var i = 0; i < n; i++) {
      var w = (i / n - y) * z;
      a[i] += x * Math.exp(-w * w);
    }
  }

  var a = [], i;
  for (i = 0; i < n; ++i) a[i] = 0;
  for (i = 0; i < 5; ++i) bump(a);
  return a.map(function(d, i) { return {x: i, y: Math.max(0, d)}; });
}
var lsvg = d3.select("#worm").node().parentNode.innerHTML;
console.log(lsvg);
var img = new Image;

console.log(img.src);
document.body.appendChild(img);
img.onload = function(){
	var canvas = document.createElement('canvas');
// IE seems to not set width and height for svg in img tag...
    canvas.width = this.width||960;
    canvas.height = this.height||500;
	canvas.getContext('2d').drawImage(this, 0,0);
    document.body.appendChild(canvas);
}
img.src = 'data:image/svg+xml; charset=utf8, ' + encodeURIComponent(new XMLSerializer().serializeToString(document.querySelector('svg')));

svg{border: 1px solid green}
img{border: 1px solid blue}
canvas{border: 1px solid red}

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<div id="worm"></div>

请注意，我在 onload 中添加了 Canvas 内容img 标签的事件。

编辑:我发现 IE 没有设置在 <img> 中加载的 svg 的宽度和高度属性。标签，因此您必须对其进行硬编码或从 <svg> 中获取它元素