// instantiate view and invoke headless render method
function render(spec) {
const view = new vega.View(vega.parse(spec, config), {
loader: vega.loader({baseURL: base}), // load files from base path
logger: vega.logger(loglevel, 'error'), // route all logging to stderr
renderer: 'none' // no primary renderer needed
}).finalize(); // clear any timers, etc
return (type === 'svg'
? view.toSVG(scale)
: view.toCanvas(scale, opt)
).then(_ => callback(_, arg));
}
async _initViewCustomizations() {
// In some cases, Vega may be initialized twice... TBD
if (!this._$container) return;
const view = new vega.View(vega.parse(this._parser.spec), this._vegaViewConfig);
this.setDebugValues(view, this._parser.spec, this._parser.vlspec);
view.warn = this.onWarn.bind(this);
view.error = this.onError.bind(this);
if (this._parser.useResize) this.updateVegaSize(view);
view.initialize(this._$container.get(0), this._$controls.get(0));
if (this._parser.useHover) view.hover();
this._addDestroyHandler(() => {
this._view = null;
view.finalize();
});
await view.runAsync();
this._view = view;
}