public void RotateToPosition(Char position)
{
if(!Char.IsLetter(position))
{
throw new EnigmaException("Invalid rotor position: {0}".Format(position));
}
var positionIndex = WireMatrix.ProjectCharacter(position);
var offsetIndex = WireMatrix.ProjectCharacter(this.OffsetPosition);
var delta = positionIndex - offsetIndex;
if (delta < 0)
{
delta = 26 + delta;
}
for(int currentIndex = 0; currentIndex < delta; currentIndex++)
{
this.WiresLeft.Rotate();
this.WiresRight = this.WiresLeft.Invert();
offsetIndex = offsetIndex + 1;
if (offsetIndex >= 26)
{
offsetIndex = 0;
}
this.OffsetPosition = WireMatrix.ProjectIndex(offsetIndex);
}
}
private void _initWires(IEnumerable<Char> wires)
{
this.WiresLeft = new WireMatrix(wires);
this.WiresRight = this.WiresLeft.Invert();
}
public bool Rotate()
{
var shouldAdvance = this.OffsetPosition.Equals(this.RotateAt);
if (this.RotateAtSecondary != null)
{
shouldAdvance = shouldAdvance || this.OffsetPosition.Equals(this.RotateAtSecondary.Value);
}
var offsetIndex = WireMatrix.ProjectCharacter(this.OffsetPosition);
offsetIndex = offsetIndex + 1;
if (offsetIndex >= 26)
{
offsetIndex = 0;
}
this.OffsetPosition = WireMatrix.ProjectIndex(offsetIndex);
this.WiresLeft.Rotate();
this.WiresRight = this.WiresLeft.Invert();
return shouldAdvance;
}
