@nicodoggie/kingraph/lib/render.js

Plots family trees using JavaScript and Graphviz

const renderGraph = require('./render_graph');
const toPng = require('./to_png');

/*
 * Renders data into various formats.
 *
 * @param String format Can be `dot`, `svg`, `png` or `png-image`.
 *
 * Use `{ async: true }` to return a Promise.
 * Using `{ format: 'png' }` implies `async: true`.
 */

async function render(data, options) {
    if (options && options.async) {
        return Promise.resolve(
            render(data, Object.assign({}, options, { async: false })),
        );
    }

    const format = (options && options.format) || 'svg';

    const dot = renderGraph(data);
    if (format === 'dot') return dot;

    const Viz = require('@viz-js/viz');
    // const { Module, render: renderVis } = require('@viz-js/viz/full.render.js');

    let viz = await Viz.instance();
    const svg = viz.renderString(dot, { format: 'svg', engine: 'dot' });
    if (format === 'svg') return svg;

    if (format === 'png') return require('./to_png')(svg);
    if (format === 'png-image') return require('./to_png_image')(svg);
}

/*
 * Export
 */

module.exports = render;