public interface IRotateHandler
{
    /// <summary>
    /// handle rotation of Ghost Transfrom
    /// </summary>
    void performRotation(BlockEditContext ctx);

    /// <summary>
    /// add an angle to the allowed angles to rotate with
    /// </summary>
    void addAngle(float angle);

    /// <summary>
    /// remove that angle
    /// </summary>
    void removeAngle(float angle);

    /// <summary>
    /// clear all added angles
    /// </summary>
    void clearAngles();
}