암호화폐 히트맵

import { HeatmapChart } from '@tradecanvas/chart'

new HeatmapChart(el, {
  data: cells,     // { id, label, value, weight, group }
  weighted: true,  // tile area by weight
  valueFormat: (v) => `${v > 0 ? '+' : ''}${v.toFixed(1)}%`,
  theme: 'dark',
})