[Chartjs]-Chart.js Line Graph: Start a line in the middle of a graph

by

4👍

✅

Yes this is possible, you can achieve this in 2 ways:

  1. specify each datapoint using its x and y coordinate
  2. place some null values in the start of your data array:
var options = {
  type: 'line',
  data: {
    labels: [1, 2, 3, 4, 5, 6],
    datasets: [{
        label: '# of Votes',
        data: [12, 19, 3, 5, 2, 3],
        borderColor: 'pink'
      },
      {
        label: '# of Points',
        data: [{
          x: 3,
          y: 6
        }, {
          x: 4,
          y: 8
        }, {
          x: 5,
          y: 2
        }, {
          x: 6,
          y: 12
        }],
        borderColor: 'orange'
      },
      {
        label: '# of Points2',
        data: [null, null, null, 9, 13, 15],
        borderColor: 'lightblue'
      }
    ]
  },
  options: {
    scales: {
      yAxes: [{
        ticks: {
          reverse: false
        }
      }]
    }
  }
}

var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
  <canvas id="chartJSContainer" width="600" height="400"></canvas>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.5.0/chart.js"></script>
</body>

0👍

You can quickly do this with offset option.

Example:

 const options = {
   ...otherChartOptions,
   
   scales: {
     x: {
       offset: true
     },
     y: {
       offset: true
     }
   }
 };

Reference: https://www.chartjs.org/docs/latest/axes/cartesian/linear.html

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