phaser/v3/src/actions/PlaceOnEllipse.js

var PlaceOnEllipse = function (items, ellipse, startAngle, endAngle)
{
    if (startAngle === undefined) { startAngle = 0; }
    if (endAngle === undefined) { endAngle = 6.28; }

    var angle = startAngle;
    var angleStep = (endAngle - startAngle) / items.length;

    var a = ellipse.width / 2;
    var b = ellipse.height / 2;

    for (var i = 0; i < items.length; i++)
    {
        items[i].x = ellipse.x + a * Math.cos(angle);
        items[i].y = ellipse.y + b * Math.sin(angle);

        angle += angleStep;
    }

    return items;
};

module.exports = PlaceOnEllipse;