Makers opening heat

// Who absorbed the flow, as zones: the makers who opened positions at each price, from each fill's
// `makerWhy`. A taker sell fills a resting bid, so bid makers opening longs absorbed selling; a taker
// buy fills an ask, so ask makers opening shorts absorbed buying. Each row draws its larger side, net.
indicator('Makers opening heat', { overlay: true, shortName: 'Makers opening' });

const tape = trades();
const heat = plot.heat('Makers opening', {
  sides: [
    { id: 'askMakers', label: 'Ask makers opening shorts', color: color.down },
    { id: 'bidMakers', label: 'Bid makers opening longs', color: color.up },
  ],
});

tape.onTrade((t) => {
  const why = t.makerWhy;
  if (t.side === 'sell' && (why === 'open_long' || why === 'flip_sl')) heat.add('bidMakers', t.price, t.size);
  else if (t.side === 'buy' && (why === 'open_short' || why === 'flip_ls')) heat.add('askMakers', t.price, t.size);
});