Public
Edited
Jan 3, 2023
Importers
function testimport(config = {}) {
return 1;
}
serialize = {
const xmlns = "http://www.w3.org/2000/xmlns/";
const xlinkns = "http://www.w3.org/1999/xlink";
const svgns = "http://www.w3.org/2000/svg";
return function serialize(svg) {
svg = svg.cloneNode(true);
const fragment = window.location.href + "#";
const walker = document.createTreeWalker(svg, NodeFilter.SHOW_ELEMENT);
while (walker.nextNode()) {
for (const attr of walker.currentNode.attributes) {
if (attr.value.includes(fragment)) {
attr.value = attr.value.replace(fragment, "#");
}
}
}
svg.setAttributeNS(xmlns, "xmlns", svgns);
svg.setAttributeNS(xmlns, "xmlns:xlink", xlinkns);
const serializer = new window.XMLSerializer();
const string = serializer.serializeToString(svg);
return new Blob([string], { type: "image/svg+xml" });
};
}
function rasterize(svg) {
let resolve, reject;
const promise = new Promise((y, n) => ((resolve = y), (reject = n)));
const image = new Image();
image.onerror = reject;
image.onload = () => {
const rect = svg.getBoundingClientRect();
const context = DOM.context2d(rect.width, rect.height);
context.drawImage(image, 0, 0, rect.width, rect.height);
context.canvas.toBlob(resolve);
};
image.src = URL.createObjectURL(serialize(svg));
return promise;
}
function ExportPicture({ DOM, chart, filename, fileType }) {
//import DOM.download from another notebook
if (fileType == "svg") {
return DOM.download(() => serialize(chart), filename, "Save as SVG");
} else if (fileType == "png") {
// 暂时还不起作用
return DOM.download(() => rasterize(chart), filename, "Save as PNG");
} else {
return "you must chose the type of picture for export! 'svg' ";
}
}
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
