Class Unrolling

Implements the unrolling algorithm. See https://doi.org/10.4230/LIPIcs.SAND.2026.11.
The unrolling of a spiral into a line, which preserves the order of the amoebots.

The algorithm repeatedly executes the shearing primitive, starting on the outermost segment and going inward to unroll the spiral into a line. The algorithm requires O(c) rounds, where c is the number of corners in the spiral.

Inheritance
object
Suboracle<Unrolling>
Unrolling
Namespace: AS2.Suboracles.Reconfiguration
Assembly: .dll
Syntax
public class Unrolling : Suboracle<Unrolling>

Constructors

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Unrolling(Particle)

Declaration
public Unrolling(Particle rep)
Parameters
Type Name Description
Particle rep

Fields

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anchor

Declaration
private ParticleAlgorithm anchor
Field Value
Type Description
ParticleAlgorithm
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clockwise

Declaration
private bool clockwise
Field Value
Type Description
bool
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count

Declaration
private int count
Field Value
Type Description
int
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currentPos

Declaration
private ParticleAlgorithm currentPos
Field Value
Type Description
ParticleAlgorithm
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directionIn

Declaration
private Direction directionIn
Field Value
Type Description
Direction
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directionOut

Declaration
private Direction directionOut
Field Value
Type Description
Direction
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first

Declaration
private bool first
Field Value
Type Description
bool
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hideBonds

Declaration
private List<ParticleAlgorithm> hideBonds
Field Value
Type Description
List<ParticleAlgorithm>
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id

Declaration
private int id
Field Value
Type Description
int
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line

Declaration
private List<ParticleAlgorithm> line
Field Value
Type Description
List<ParticleAlgorithm>
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lineDir

Declaration
private Direction lineDir
Field Value
Type Description
Direction
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round

Declaration
private int round
Field Value
Type Description
int
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shearSuboracle

Declaration
private Shear shearSuboracle
Field Value
Type Description
Shear
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x

Declaration
private int x
Field Value
Type Description
int
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y

Declaration
private int y
Field Value
Type Description
int

Methods

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Init(List<Unrolling>, Direction, ParticleAlgorithm, bool, int)

Declaration
public void Init(List<Unrolling> memberParticles, Direction startDir = Direction.NONE, ParticleAlgorithm anchor = null, bool clockwise = false, int count = 0)
Parameters
Type Name Description
List<Unrolling> memberParticles
Direction startDir
ParticleAlgorithm anchor
bool clockwise
int count
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OnActivate()

Virtual method that derived suboracles override to implement their subtask logic. Called once per round by Activate().

Declaration
protected override bool OnActivate()
Returns
Type Description
bool

true if the subtask is complete and the suboracle should deactivate; false if more rounds are needed.
Overrides
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removeBonds()

Helper function to release all bonds except for the spiral structure bonds (bonds to predecessor and successor in the spiral)

Declaration
private void removeBonds()