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`.
 */

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 svg = require('viz.js')(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);

    throw new Error(`Unrecognized file format: '${format}'`);
}

/*
 * Export
 */

module.exports = render;