Get a point on a line, defined by two other points

line-interpolation.js

// Line Interpolation
function createLineInterpolationFunction(p1, p2) {
  const slope = (p2.y - p1.y) / (p2.x - p1.x);
  const yIntercept = p1.y - (slope * p1.x);
  return (x) => slope * x + yIntercept;
}

// Example
const getY = createLineInterpolationFunction({ x: 200, y: 20}, { x: 1440, y: 60 });
const point = { x: 100, y: getY(100) };