您好,我需要将单个页面中的 D3 图表导出为单个图像 我的导出代码:
if(itype=="image/png"){
for(i=0;i<svg.length;i++){
svgData[i] = (new XMLSerializer()).serializeToString(svg[i]);
canvas[i] = document.createElement("canvas");
svgSize[i] = svg[i].getBoundingClientRect();
canvas[i].width = svgSize[i].width;
canvas[i].height = svgSize[i].height;
ctx = canvas[i].getContext("2d");
img[i] = document.createElement("img");
img[i].setAttribute("src", "data:image/svg+xml;base64," + btoa(unescape(encodeURIComponent(svgData[i]))) );
ctx.drawImage(img[i], 0, 0);
ctx.save();
var imgsrc = canvas[i].toDataURL("image/png");
var a = document.createElement("a");
a.download = ImageName+".png";
a.href = imgsrc;
a.click();
}}
我的Svg示例代码(假设使用相同的代码五次在单页中创建五个图形)
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 800 800" xml:space="preserve" height="500" width="500">
<g id="layer1" transform="translate(-3.6028037,-330.49911)">
<g id="g3691">
<path id="path1160" fill="#FFFFFF" stroke="#000000" stroke-width="17.9963" stroke-linecap="round" stroke-linejoin="round" d="
M24.5,518.1c27.3-62.2,84.5-97.3,127.7-78.3c43.2,19,56.1,84.8,28.8,147c-27.3,62.2-35.6,91.9-117.7,58.7
C19.6,627.8-2.8,580.3,24.5,518.1S-2.8,580.3,24.5,518.1z" />
<path id="path1162" fill="#FFFFFF" stroke="#000000" stroke-width="18" stroke-linecap="round" stroke-linejoin="round" d="
M736.6,520.7c-27.3-62.2-84.5-97.3-127.7-78.3c-43.2,19-56.1,84.8-28.8,147s35.6,91.9,117.7,58.7
C741.5,630.4,763.9,582.9,736.6,520.7L736.6,520.7z" />
<path id="path1159" fill="#FFFFFF" stroke="#000000" stroke-width="3.5115" stroke-linecap="round" stroke-linejoin="round" d="
M641.7,645.4c0,390.6-532.8,390.6-532.8,0S641.7,254.8,641.7,645.4z" />
<path id="path3026" fill="#FFFFFF" stroke="#000000" stroke-width="8.9982" d="M375.4,513.3
c-6.5,0-84.5-26.3-124.4-16.8c-71.2,16.8-102.3,69.9-84.2,169.7c8.7,48,33.7,79,33.7,79s-55.7,19.6-47.9,97.2
c10.4,103.6,121,147.3,238.3,146.4c98.6-0.8,211-47.9,212.4-141.2c1.1-83.1-24.6-86.8-46.6-103.6c5.2-6.5,16.7-41.7,31.1-93.3
c22-79-15.5-142.5-107.5-155.4C443.3,489.9,383.1,513.3,375.4,513.3z" />
<path id="path3027" fill="none" stroke="#000000" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round" d="
M299.4,556.7c27.3-1.1,30.3,75.3,3,76.4l0,0C275.1,634.1,272.1,557.8,299.4,556.7z" />
<path id="path3028" fill="none" stroke="#000000" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round" d="
M450.2,633c-27.3,1.2-30.6-75.2-3.3-76.4l0,0C474.2,555.5,477.5,631.9,450.2,633z" />
<path id="path3029" fill="none" stroke="#000000" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round" d="
M420.4,694.6c0,32-92.5,32-92.5,0l0,0C327.9,662.6,420.4,662.6,420.4,694.6z" />
<path id="path3030" fill="none" stroke="#000000" stroke-width="31.4936" stroke-linecap="round" d="
M214.7,826.6c63.5,86.8,242.2,111.4,330.3,2.6" />
</g>
</g>
</svg>
我使用相同的代码 5 次(即 svg.length=5),我将这些代码放入我的页面中。就像一个接着另一个一样。上面的代码编写的是下载所有图像,但它们是作为具有通用名称的单个图像下载的。我需要单个文件中的所有五个图像(.jpeg、.png)
我们是否有可能在客户端执行此操作?
最佳答案
创建一个 Canvas 并使用 drawImage
方法中的位置参数在适当的位置绘制 svg 图像。然后,下载 Canvas 就可以完成这项工作。
例如:
if(itype=="image/png"){
var c = document.createElement("canvas");
c.setAttribute("height",totalHeight);
c.setAttribute("width",totalWidth);
ctx = c.getContext("2d");
var marginX = 10, marginY = 10;
for(i=0;i<svgs.length;i++){
var xml = new XMLSerializer().serializeToString(svgs[i]);
var svg64 = btoa(xml);
var b64Start = 'data:image/svg+xml;base64,';
var image64 = b64Start + svg64;
var svgSize = svgs[i].getBoundingClientRect();
var img= document.createElement("img");
img.setAttribute("src", image64);
ctx.drawImage(img, marginX, marginY);
ctx.save();
marginX += svgSize.width + 20;
};
var imgsrc = c.toDataURL("image/png");
var a = document.createElement("a");
a.download = "Sample.png";
a.href = imgsrc;
a.click();
}
工作中Fiddle
关于javascript - 将 D3 Svg 图表(即页面中的 5 个图表)导出到单个图像中,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35053548/