#グループ付き積み上げ棒グラフ

const config = {
  type: 'bar',
  data: data,
  options: {
    plugins: {
      title: {
        display: true,
        text: 'Chart.js Bar Chart - Stacked'
      },
    },
    responsive: true,
    interaction: {
      intersect: false,
    },
    scales: {
      x: {
        stacked: true,
      },
      y: {
        stacked: true
      }
    }
  }
};

const DATA_COUNT = 7;
const NUMBER_CFG = {count: DATA_COUNT, min: -100, max: 100};
const labels = Utils.months({count: 7});
const data = {
  labels: labels,
  datasets: [
    {
      label: 'Dataset 1',
      data: Utils.numbers(NUMBER_CFG),
      backgroundColor: Utils.CHART_COLORS.red,
      stack: 'Stack 0',
    },
    {
      label: 'Dataset 2',
      data: Utils.numbers(NUMBER_CFG),
      backgroundColor: Utils.CHART_COLORS.blue,
      stack: 'Stack 0',
    },
    {
      label: 'Dataset 3',
      data: Utils.numbers(NUMBER_CFG),
      backgroundColor: Utils.CHART_COLORS.green,
      stack: 'Stack 1',
    },
  ]
};

const actions = [
  {
    name: 'Randomize',
    handler(chart) {
      chart.data.datasets.forEach(dataset => {
        dataset.data = Utils.numbers({count: chart.data.labels.length, min: -100, max: 100});
      });
      chart.update();
    }
  },
];