/**
 * Convert given value's base into the parameter unitName
 *
 * @param {Double} value
 * @param {String} unitName
 * @return {Double}
 * @api private
 */

module.exports = function convertAngle(value, unitName) {
	var factors = {
		"rad" : 1,
		"deg" : 180 / Math.PI,
		"turn": 0.5 / Math.PI,
		"grad": 200 / Math.PI
	}
	return value * factors[unitName];
}