uchicago.src.repastdemos.life
Class LifeModel

java.lang.Object
  uchicago.src.sim.engine.SimModelImpl
      uchicago.src.sim.engine.SimpleModel
          uchicago.src.repastdemos.life.LifeModel

All Implemented Interfaces:

DescriptorContainer, SimEventProducer, SimModel

public class LifeModel
extends SimpleModel

An implementation of Conway's game of Life. This is implemented here on both a bounded toroidal grid and on an "infinite" space. The infinite space is in fact a really large sparse matrix, see InfiniteLifeSpace.java for more.

This is an implementation of John Conway's game of life. Life is typically played on an "infinite" square grid. Each cell can be either live or dead. A cell comes to life if it has three neighboring live cells, and will die of "loneliness" if it has less than two neighbors, and will die of overcrowding if it has more than three neighbors.

Particular starting patterns of live cells can yield some very interesting results. This implementation provides a rather bland random initialization as well as the R-Pentimino. You can create your own starting pattern by choosing Empty as the initial pattern and stepping one tick into the simulation to show the display. You can then click on the display to add live cells wherever you want. Percent full is used to specify the percent full for the random initial pattern. This implementation provides an "infinite" (a really large) grid as well as a torus of user-defined size. When using the the infinite space you can scroll the display to see what's happening off-screen. Make sure the display frame has focus, and then press the arrow keys to scroll the display.

The web is littered with web pages devoted to Conway's Life. One such is http://www.math.com/students/wonders/life/life.html.

This simulation uses SimpleModel as its base class. As such all the behavoir begins with LifeModel's step(), and postStep() method. Every tick each checks if it has 2 or 3 neighbors. If so, it continues to live, else it dies. LifeAgents do not die immediately. They are added to a deathList and then removed from the main list of agents (agentList) in postStep(). After this check is done for every agent, we call step on the space. This if any empty space is surrounded by 3 and only 3 agents. If so a new agent is born. Like death, birth is delayed until postStep().

Field Summary

Fields inherited from class uchicago.src.sim.engine.SimpleModel

agentList, autoStep, isGui, name, params, schedule, seed, shuffle, startAt

Fields inherited from class uchicago.src.sim.engine.SimModelImpl

descriptors, modelManipulator

Constructor Summary

LifeModel()

Method Summary

void	addAgent(LifeAgent agent)
void	buildModel()
int	getHeight()
boolean	getInfinite()
uchicago.src.repastdemos.life.LifeModel.ISetup	getInitialPattern()
float	getPercentFull()
int	getWidth()
static void	main(java.lang.String[] args)
void	postStep()
void	removeAgent(LifeAgent agent)
void	setHeight(int val)
void	setInfinite(boolean val)
void	setInitialPattern(uchicago.src.repastdemos.life.LifeModel.ISetup val)
void	setPercentFull(float val)
void	setup() Prepares a model for a new run, typically by deallocating objects or setting them to some reasonable default.
void	setWidth(int val)
void	step()

Methods inherited from class uchicago.src.sim.engine.SimpleModel

atEnd, atPause, begin, buildSchedule, getInitParam, getName, getNextDoubleFromTo, getNextIntFromTo, getSchedule, preStep, run, runAutoStep, setRngSeed, setStoppingTime, setStoppingTime

Methods inherited from class uchicago.src.sim.engine.SimModelImpl

addPropertyListener, addSimEventListener, clearMediaProducers, clearPropertyListeners, fireBooleanPropertyEvent, fireEndSim, fireNumericPropertyEvent, fireObjectPropertyEvent, firePauseSim, fireSimEvent, fireStopSim, fireStringPropertyEvent, generateNewSeed, getController, getMediaProducers, getModelManipulator, getParameterDescriptors, getPropertiesValues, getRngSeed, getTickCount, pause, registerDisplaySurface, registerMediaProducer, removePropertyListener, removeSimEventListener, setController, stop

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LifeModel

public LifeModel()

Method Detail

getInitialPattern

public uchicago.src.repastdemos.life.LifeModel.ISetup getInitialPattern()

setInitialPattern

public void setInitialPattern(uchicago.src.repastdemos.life.LifeModel.ISetup val)

getWidth

public int getWidth()

setWidth

public void setWidth(int val)

getHeight

public int getHeight()

setHeight

public void setHeight(int val)

getPercentFull

public float getPercentFull()

setPercentFull

public void setPercentFull(float val)

getInfinite

public boolean getInfinite()

setInfinite

public void setInfinite(boolean val)

buildModel

public void buildModel()

Overrides:

buildModel in class SimpleModel

setup

public void setup()

Description copied from interface: SimModel

Prepares a model for a new run, typically by deallocating objects or setting them to some reasonable default. Called whenever the setup button is clicked or if operating in batch mode whenever a single run has ended in preparation for the next. Also called when the model is first loaded.

Specified by:

setup in interface SimModel

Overrides:

setup in class SimpleModel

removeAgent

public void removeAgent(LifeAgent agent)

addAgent

public void addAgent(LifeAgent agent)

step

public void step()

Overrides:

step in class SimpleModel

postStep

public void postStep()

Overrides:

postStep in class SimpleModel

main

public static void main(java.lang.String[] args)