Chart.js/docs/samples/line/interpolation.md

# Interpolation Modes

```js chart-editor
// <block:setup:1>
const DATA_COUNT = 12;
const labels = [];
for (let i = 0; i < DATA_COUNT; ++i) {
  labels.push(i.toString());
}
const datapoints = [0, 20, 20, 60, 60, 120, NaN, 180, 120, 125, 105, 110, 170];
const data = {
  labels: labels,
  datasets: [
    {
      label: 'Cubic interpolation (monotone)',
      data: datapoints,
      borderColor: Utils.CHART_COLORS.red,
      fill: false,
      cubicInterpolationMode: 'monotone',
      tension: 0.4
    }, {
      label: 'Cubic interpolation',
      data: datapoints,
      borderColor: Utils.CHART_COLORS.blue,
      fill: false,
      tension: 0.4
    }, {
      label: 'Linear interpolation (default)',
      data: datapoints,
      borderColor: Utils.CHART_COLORS.green,
      fill: false
    }
  ]
};
// </block:setup>

// <block:config:0>
const config = {
  type: 'line',
  data: data,
  options: {
    responsive: true,
    plugins: {
      title: {
        display: true,
        text: 'Chart.js Line Chart - Cubic interpolation mode'
      },
    },
    interaction: {
      intersect: false,
    },
    scales: {
      x: {
        display: true,
        title: {
          display: true
        }
      },
      y: {
        display: true,
        title: {
          display: true,
          text: 'Value'
        },
        suggestedMin: -10,
        suggestedMax: 200
      }
    }
  },
};
// </block:config>

module.exports = {
  actions: [],
  config: config,
};
```

## Docs 
* [Line](../../charts/line.html)
  * [`cubicInterpolationMode`](../../charts/line.html#cubicinterpolationmode)
  * [Line Styling (`tension`)](../../charts/line.html#line-styling)