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20
Semester 1/Programming 1/Java/examples/projects/chapter07/automaton-v4/Automaton.ctxt Normal file
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#BlueJ class context
comment0.params=numberOfCells
comment0.target=Automaton(int)
comment0.text=\n\ Create\ a\ 1D\ automaton\ consisting\ of\ the\ given\ number\ of\ cells.\n\ @param\ numberOfCells\ The\ number\ of\ cells\ in\ the\ automaton.\n
comment1.params=
comment1.target=void\ print()
comment1.text=\n\ Print\ the\ current\ state\ of\ the\ automaton.\n
comment2.params=
comment2.target=void\ update()
comment2.text=\n\ Update\ the\ automaton\ to\ its\ next\ state.\n
comment3.params=
comment3.target=void\ reset()
comment3.text=\n\ Reset\ the\ automaton.\n
comment4.params=left\ center\ right
comment4.target=int\ calculateNextState(int,\ int,\ int)
comment4.text=\n\ Calculate\ the\ next\ state\ of\ the\ center\ cell\n\ given\ current\ left,\ center\ and\ right\ cell\n\ values.\n\ This\ implements\ Wolfram\ code\ 110.\n\ @see\ https\://en.wikipedia.org/wiki/Wolfram_code\n\ @param\ left\ The\ state\ of\ the\ cell\ to\ the\ left\ of\ center.\n\ @param\ center\ The\ state\ of\ the\ center\ cell.\n\ @param\ right\ The\ state\ of\ the\ cell\ to\ the\ right\ of\ center.\n\ @return\ The\ new\ value\ of\ center\ (0\ or\ 1).\n
comment5.params=left\ center\ right
comment5.target=int\ encodeTriplet(int,\ int,\ int)
comment5.text=\n\ Encode\ the\ 1/0\ triplet\ (left,\ center,\ right)\ as\ an\n\ integer\ value\ in\ the\ range\ 0-7.\n\ @param\ left\ The\ state\ of\ the\ cell\ to\ the\ left\ of\ center\ (0\ or\ 1).\n\ @param\ center\ The\ state\ of\ the\ center\ cell\ (0\ or\ 1).\n\ @param\ right\ The\ state\ of\ the\ cell\ to\ the\ right\ of\ center\ (0\ or\ 1).\n\ @return\ (left,center,right)\ interpreted\ as\ a\ 3-bit\ value.\n
numComments=6

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Semester 1/Programming 1/Java/examples/projects/chapter07/automaton-v4/Automaton.java Normal file
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import java.util.*;
/**
* Model a 1D elementary cellular automaton.
*
* @author David J. Barnes and Michael Kölling
* @version 2016.02.29 - version 4
*/
public class Automaton
{
// The number of cells.
private final int numberOfCells;
// The state of the cells.
private int[] state;
// The state table encoding the next-state changes.
private int[] stateTable;
/**
* Create a 1D automaton consisting of the given number of cells.
* @param numberOfCells The number of cells in the automaton.
*/
public Automaton(int numberOfCells)
{
this.numberOfCells = numberOfCells;
// Allow an extra element to avoid 'fencepost' errors.
state = new int[numberOfCells + 1];
stateTable = new int[] {
0, 1, 0, 0, 1, 0, 0, 1, // Wolfram code 146
};
// Seed the automaton with a single 'on' cell.
state[numberOfCells / 2] = 1;
}
/**
* Print the current state of the automaton.
*/
public void print()
{
for(int cellValue : state) {
System.out.print(cellValue == 1 ? "*" : " ");
}
System.out.println();
}
/**
* Update the automaton to its next state.
*/
public void update()
{
// Build the new state in a separate array.
int[] nextState = new int[state.length];
// Use 0 for the non-existent value to the left of
// the first cell.
int left = 0;
int center = state[0];
for(int i = 0; i < numberOfCells; i++) {
int right = state[i + 1];
nextState[i] = calculateNextState(left, center, right);
left = center;
center = right;
}
state = nextState;
}
/**
* Reset the automaton.
*/
public void reset()
{
Arrays.fill(state, 0);
// Seed the automaton with a single 'on' cell in the middle.
state[numberOfCells / 2] = 1;
}
/**
* Calculate the next state of the center cell
* given current left, center and right cell
* values.
* This implements Wolfram code 110.
* @see https://en.wikipedia.org/wiki/Wolfram_code
* @param left The state of the cell to the left of center.
* @param center The state of the center cell.
* @param right The state of the cell to the right of center.
* @return The new value of center (0 or 1).
*/
private int calculateNextState(int left, int center, int right)
{
return stateTable[encodeTriplet(left, center, right)];
}
/**
* Encode the 1/0 triplet (left, center, right) as an
* integer value in the range 0-7.
* @param left The state of the cell to the left of center (0 or 1).
* @param center The state of the center cell (0 or 1).
* @param right The state of the cell to the right of center (0 or 1).
* @return (left,center,right) interpreted as a 3-bit value.
*/
private int encodeTriplet(int left, int center, int right)
{
return left * 4 + center * 2 + right;
}
}

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Semester 1/Programming 1/Java/examples/projects/chapter07/automaton-v4/AutomatonController.ctxt Normal file
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#BlueJ class context
comment0.params=numberOfCells
comment0.target=AutomatonController(int)
comment0.text=\n\ Create\ an\ AutomatonController.\n\ @param\ numberOfCells\ The\ number\ of\ cells\ in\ the\ automaton.\n
comment1.params=
comment1.target=AutomatonController()
comment1.text=\n\ Create\ an\ AutomatonController\ with\n\ a\ default\ number\ of\ cells.\n
comment2.params=numSteps
comment2.target=void\ run(int)
comment2.text=\n\ Run\ the\ automaton\ for\ the\ given\ number\ of\ steps.\n\ @param\ numSteps\ The\ number\ of\ steps.\n
comment3.params=
comment3.target=void\ step()
comment3.text=\n\ Run\ the\ automaton\ for\ a\ single\ step.\n
comment4.params=
comment4.target=void\ reset()
comment4.text=\n\ Reset\ the\ automaton.\n
numComments=5

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Semester 1/Programming 1/Java/examples/projects/chapter07/automaton-v4/AutomatonController.java Normal file
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/**
* Set up and control an elementary cellular automaton.
*
* @author David J. Barnes and Michael Kölling
* @version 2016.02.29
*/
public class AutomatonController
{
// The automaton.
private Automaton auto;
/**
* Create an AutomatonController.
* @param numberOfCells The number of cells in the automaton.
*/
public AutomatonController(int numberOfCells)
{
auto = new Automaton(numberOfCells);
auto.print();
}
/**
* Create an AutomatonController with
* a default number of cells.
*/
public AutomatonController()
{
this(50);
}
/**
* Run the automaton for the given number of steps.
* @param numSteps The number of steps.
*/
public void run(int numSteps)
{
for(int step = 1; step <= numSteps; step++) {
step();
}
}
/**
* Run the automaton for a single step.
*/
public void step()
{
auto.update();
auto.print();
}
/**
* Reset the automaton.
*/
public void reset()
{
auto.reset();
auto.print();
}
}

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Semester 1/Programming 1/Java/examples/projects/chapter07/automaton-v4/README.TXT Normal file
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Project: automaton
Aothors: David J. Barnes and Michael Kölling
This project is part of the material of the book
Objects First with Java - A Practical Introduction using BlueJ
Sixth edition
David J. Barnes and Michael Kölling
Pearson Education, 2016
It is discussed in chapter 7.

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Semester 1/Programming 1/Java/examples/projects/chapter07/automaton-v4/package.bluej Normal file
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#BlueJ package file
dependency1.from=AutomatonController
dependency1.to=Automaton
dependency1.type=UsesDependency
objectbench.height=76
objectbench.width=737
package.editor.height=400
package.editor.width=629
package.editor.x=70
package.editor.y=80
package.numDependencies=1
package.numTargets=2
package.showExtends=true
package.showUses=true
project.charset=UTF-8
readme.editor.height=700
readme.editor.width=900
readme.editor.x=53
readme.editor.y=23
target1.editor.height=720
target1.editor.width=938
target1.editor.x=449
target1.editor.y=137
target1.height=50
target1.name=Automaton
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=90
target1.x=170
target1.y=160
target2.editor.height=777
target2.editor.width=994
target2.editor.x=286
target2.editor.y=23
target2.height=50
target2.name=AutomatonController
target2.naviview.expanded=false
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=160
target2.x=70
target2.y=70