stereoboosterWhy? If you need to generate an image on the server side.
At first, I thought it was impossible. There is cytosnap that uses Puppeteer (headless browser). Then, for fun, I rewrote it with Tauri.
But later, I though, what if it would be possible to run it with Node.js. And, indeed, it’s possible.
Solution
Add polyfils for the browser (it also includes canvas):
class XMLSerializer {
serializeToString(node) {
return serialize(node);
}
}
global.XMLSerializer = XMLSerializer;
const dom = new JSDOM(`<!DOCTYPE html><div id="cy"></div>`);
global.window = dom.window;
global.document = dom.window.document;
Explicitly set bounding box
source.layout.boundingBox = {
x1: 0,
y1: 0,
x2: source.width,
y2: source.height,
};
Generate a graph the same way you would in the browser:
const container = dom.window.document.querySelector("#cy");
const cy = cytoscape({ container, ...defaults, ...source });
cy.layout(source.layout).run();
For now I was able to render it only as SVG:
await loadExtension("svg");
res = cy.svg({
bg: source.background,
full: true,
});
In order to not polute global scope with polyfills we can run this script as sub-process:
const executablePath = `bin/cyto-nodejs.js`;
const bin = spawn(executablePath, args, {
windowsHide: true,
});
That’s it.
Source code
Source code is here: https://github.com/stereobooster/cyto-nodejs
