mattermost/webapp/utils/commons.jsx

export function getDistanceBW2Points(point1, point2, xAttr = 'x', yAttr = 'y') {
    return Math.sqrt(Math.pow(point1[xAttr] - point2[xAttr], 2) + Math.pow(point1[yAttr] - point2[yAttr], 2));
}

/**
  * Funtion to return nearest point of given pivot point.
  * It return two points one nearest and other nearest but having both coorditanes smaller than the given point's coordinates.
  */
export function getNearestPoint(pivotPoint, points, xAttr = 'x', yAttr = 'y') {
    var nearestPoint = {};
    for (const point of points) {
        if (typeof nearestPoint[xAttr] === 'undefined' || typeof nearestPoint[yAttr] === 'undefined') {
            nearestPoint = point;
        } else if (getDistanceBW2Points(point, pivotPoint, xAttr, yAttr) < getDistanceBW2Points(nearestPoint, pivotPoint, xAttr, yAttr)) {
        // Check for bestImage
            nearestPoint = point;
        }
    }
    return nearestPoint;
}