I have a set of data points like
{ x: 5, y: 10 }, { x: 10, y: 15 }, { x: 20, y: 25 }To accomplish this task, you can utilize the function provided below:
function calculateValueAt(x) {
let xScale = graph.scales['x-axis-0'];
let yScale = graph.scales['y-axis-0'];
let dataValues = graph.data.datasets[0].data;
let position = dataValues.findIndex(obj => obj.x >= x);
let previous = dataValues[position - 1];
let nextPoint = dataValues[position];
if (previous && nextPoint) {
let slopeValue = (nextPoint.y - previous.y) / (nextPoint.x - previous.x);
return previous.y + (x - previous.x) * slopeValue;
}
}
The majority of the code has been borrowed from
interpolate.js, an impressive library known aschartjs-plugin-crosshair.
Please refer to the runnable code snippet below to witness its functionality:
const graph = new Chart("graph", {
type: 'line',
data: {
datasets: [{
label: '',
data: [{ x: 5, y: 10 }, { x: 10, y: 15 }, { x: 20, y: 25 }],
type: 'line',
borderColor: 'red',
fill: false,
}],
},
options: {
responsive: false,
scales: {
xAxes: [{
type: 'linear'
}]
}
}
});
function calculateValueAt(x) {
let xScale = graph.scales['x-axis-0'];
let yScale = graph.scales['y-axis-0'];
let dataValues = graph.data.datasets[0].data;
let position = dataValues.findIndex(obj => obj.x >= x);
let previous = dataValues[position - 1];
let nextPoint = dataValues[position];
if (previous && nextPoint) {
let slopeValue = (nextPoint.y - previous.y) / (nextPoint.x - previous.x);
return previous.y + (x - previous.x) * slopeValue;
}
}
let xValue = 13;
let yValue = calculateValueAt(xValue);
console.log('x-coordinate: ' + xValue + ' -> y-coordinate: ' + yValue);<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
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