@jbrowse/plugin-wiggle/esm/MultiDensityRenderer/MultiDensityRenderer.js

JBrowse 2 wiggle adapters, tracks, etc.

import { forEachWithStopTokenCheck, groupBy } from '@jbrowse/core/util';
import WiggleBaseRenderer from '../WiggleBaseRenderer';
export default class MultiDensityPlotRenderer extends WiggleBaseRenderer {
    async draw(ctx, props) {
        const { stopToken, sources, features } = props;
        const groups = groupBy(features.values(), f => f.get('source'));
        const height = props.height / sources.length;
        let feats = [];
        const { drawDensity } = await import('../drawDensity');
        ctx.save();
        forEachWithStopTokenCheck(sources, stopToken, source => {
            const features = groups[source.name] || [];
            const { reducedFeatures } = drawDensity(ctx, {
                ...props,
                features,
                height,
            });
            ctx.translate(0, height);
            feats = feats.concat(reducedFeatures);
        });
        ctx.restore();
        return {
            reducedFeatures: feats,
        };
    }
}