Get the position of a point on a circle.

coords.js

/**
 * Get the position of a point on a circle.
 * 
 * @param {number} radius - Radius of the circle.
 * @param {number} angle - Angle of the point to calculate.
 * @param {number} offset - How far outside the circle the point should fall.
 * @param {number} dotSize - Adjust for the size of the dot.
 * 
 * @returns {object} results for top and left coords.
 */
const coords = (radius, angle, offset = 0, dotSize = 0) => {
  const rad = angle / 180 * Math.PI;
  const offsetRadius = radius + offset;
  const center = radius - (dotSize / 2);
  
  return {
    top: offsetRadius * Math.sin(rad) + center,
    left: offsetRadius * Math.cos(rad) + center,
  };
}