Question
In: Computer Science
Please USE C++ The goal for this Project is to create a simple two-dimensional predator-prey simulation....
Please USE C++
The goal for this Project is to create a simple two-dimensional predator-prey simulation. In this simulation the prey are ants and the pred-ators are doodlebugs. These critters live in a world composed of a 20 × 20 grid of cells. Only one critter may occupy a cell at a time. The grid is enclosed, so a critter is not allowed to move off the edges of the world. Time is simulated in time steps. Each critter performs some action every time step.
The ants behave according to the following model:
Move. Every time step, randomly try to move up, down, left, or
right. If the neighboring cell in the selected direction is
occupied or would move the ant off the grid, then the ant stays in
the current cell.
Breed. If an ant survives for three time steps, then at the end of the time step (that is; after moving) the ant will breed. This is simulated by creat-ing a new ant in an adjacent (up, down, left, or right) cell that is empty. If there is no empty cell available, then no breeding occurs. Once an off-spring is produced, an ant cannot produce an offspring until three more time steps have elapsed.
The doodlebugs behave according to the following model:
Move. Every time step, if there is an adjacent ant (up, down, left,
or right), then the doodlebug will move to that cell and eat the
ant. Otherwise, the doodlebug moves according to the same rules as
the ant. Note that a doodlebug cannot eat other doodlebugs.
Breed. If a doodlebug survives for eight time steps, then at the end of the time step it will spawn off a new doodlebug in the same manner as the ant.
Starve. If a doodlebug has not eaten an ant within the last three time steps, then at the end of the third time step it will starve and die. The doodlebug should then be removed from the grid of cells.
During one turn, all the doodlebugs should move before the ants do.
Write a program to implement this simulation and draw the world using ASCII characters of “o” for an ant and “X” for a doodlebug or "-" for an empty space. Create a class named Organism that encapsulates basic data common to both ants and doodlebugs. This class should have a virtual function named move that is defined in the derived classes of Ant and Doodlebug. You may need additional data structures to keep track of which critters have moved.
Initialize the world with 5 doodlebugs and 100 ants. After each time step, prompt the user to press Enter to move to the next time step. You should see a cyclical pattern between the population of predators and prey, although random perturbations may lead to the elimination of one or both species.
Please USE C++
Solutions
Expert Solution
#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
const int numOfColumns = 20;
const int numOfRows = 20;
class Organism{
public:
Organism();
Organism(int fIndex, int sIndex, int myAge, int myIdNumber);
Organism(int myIdNumber);
int get_first_index() const;
int get_second_index() const;
int get_age() const;
int get_idNumber() const;
bool get_life_status() const;
virtual char get_symbol();
void set_first_index(int newFirstIndex);
void set_second_index(int newSecondIndex);
void set_age(int newAge);
void set_id_number(int newIdNumber);
void set_symbol(char newSymbol);
void set_life_status(bool newStatus);
virtual void out_symbol();
virtual void move();
virtual void breed(){};
private:
char symbol;
int firstIndex;
int secondIndex;
int age;
int idNumber;
bool isAlive;
};
class Space: public Organism
{
public:
Space();
virtual void out_symbol();
virtual char get_symbol();
private:
char symbol;
};
class Ant: public Organism{
public:
Ant();
virtual void out_symbol();
virtual char get_symbol();
virtual void move(Organism* gridArray[numOfRows][numOfColumns], Space spacesArray[]);
virtual void breed(Organism* gridArray[numOfRows][numOfColumns], Ant antArray[], int &antCounter);
private:
char symbol;
};
class Doodlebug: public Organism{
public:
Doodlebug();
void set_time_since_meal(int newTime);
int get_time_since_meal() const;
virtual void out_symbol();
virtual char get_symbol();
virtual void move(Organism* gridArray[numOfRows][numOfColumns], Doodlebug doodleBugArray[], Space spacesArray[]);
virtual void breed(Organism* gridArray[numOfRows][numOfColumns], Doodlebug doodleBugArray[], int &doodleBugCounter);
void starve(Organism* gridArray[numOfRows][numOfColumns], Space spacesArray[]);
private:
char symbol;
int timeSinceMeal;
};
void initiate_time_step(Organism* gridArray[numOfRows][numOfColumns], Ant antArr[], Space spaceArr[], Doodlebug doodlebugArr[], int &antCounter, int &doodlebugCounter);
int find_next_available_index(Doodlebug arr[]);
int find_next_available_index(Ant arr[]);
int main(){
srand(time(0)%100);
int doodlebugCount = 0;
int antCount = 0;
int tempFirstI, tempSecondI;
Space spaceArray[1];
Doodlebug doodlebugArray[400];
Ant antArray[400];
Organism* gameSpace[20][20];
for(int c = 0; c < 20; c++){
for (int i = 0; i < 20; i++){
gameSpace[c][i] = nullptr;
}
}
while (doodlebugCount < 5){
bool spawned = false;
while(spawned == false){
tempFirstI = rand() % 20;
tempSecondI = rand() % 20;
if(gameSpace[tempFirstI][tempSecondI] == nullptr){
gameSpace[tempFirstI][tempSecondI] = &doodlebugArray[doodlebugCount];
gameSpace[tempFirstI][tempSecondI]->set_first_index(tempFirstI);
gameSpace[tempFirstI][tempSecondI]->set_second_index(tempSecondI);
gameSpace[tempFirstI][tempSecondI]->set_life_status(true);
doodlebugCount++;
spawned = true;
}
}
}
while (antCount < 100){
bool spawned = false;
while(spawned == false){
tempFirstI = rand() % 20;
tempSecondI = rand() % 20;
if(gameSpace[tempFirstI][tempSecondI] == nullptr){
gameSpace[tempFirstI][tempSecondI] = &antArray[antCount];
gameSpace[tempFirstI][tempSecondI]->set_first_index(tempFirstI);
gameSpace[tempFirstI][tempSecondI]->set_second_index(tempSecondI);
gameSpace[tempFirstI][tempSecondI]->set_life_status(true);
antCount++;
spawned = true;
}
}
}
for(int c = 0; c < numOfColumns; c++){
for (int i = 0; i < numOfRows; i++){
if (gameSpace[c][i] == nullptr){
gameSpace[c][i] = &spaceArray[0];
}
}
}
for(int c = 0; c < numOfColumns; c++){
for (int i = 0; i < numOfRows; i++){
gameSpace[c][i]->out_symbol();
cout<<" ";
}
cout<<endl;
}
cout<<"World has been initialized with 100 ants and 5 doodlebugs."<<endl;
char test;
bool seenEnd = false;
while(seenEnd == false){
cout<<"Press enter to initiate time step: ";
test = fgetc(stdin);
if(test == '\n'){
initiate_time_step(gameSpace, antArray, spaceArray, doodlebugArray, antCount, doodlebugCount);
seenEnd = false;
}
else
seenEnd = true;
}
return 0;
}
Organism::Organism(){
firstIndex = -1;
secondIndex = -1;
age = 0;
idNumber = -1;
isAlive = false;
}
Organism::Organism(int fIndex, int sIndex, int myAge, int myIdNumber){
firstIndex = fIndex;
secondIndex = sIndex;
age = myAge;
idNumber = myIdNumber;
}
Organism::Organism(int myIdNumber){
firstIndex = -1;
secondIndex = -1;
age = 0;
idNumber = myIdNumber;
}
int Organism::get_first_index() const{
return firstIndex;
}
int Organism::get_second_index() const{
return secondIndex;
}
int Organism::get_age() const{
return age;
}
int Organism::get_idNumber() const{
return idNumber;
}
bool Organism::get_life_status() const{
return isAlive;
}
void Organism::set_first_index(int newFirstIndex){
firstIndex = newFirstIndex;
}
void Organism::set_second_index(int newSecondIndex){
secondIndex = newSecondIndex;
}
void Organism::set_age(int newAge){
age = newAge;
}
void Organism::set_id_number(int newIdNumber){
idNumber = newIdNumber;
}
void Organism:: set_life_status(bool newStatus){
isAlive = newStatus;
}
char Organism::get_symbol(){
return symbol;
}
void Organism::out_symbol(){
cout<<"here's your problem"<<endl;
};
void Organism::move(){
cout<<"move"<<endl;
};
Space::Space():Organism(), symbol('-'){};
void Space:: out_symbol() {
cout<<symbol;
}
char Space:: get_symbol(){
return symbol;
}
Ant::Ant():Organism(), symbol('o'){};
void Ant:: out_symbol() {
cout<<symbol;
}
char Ant:: get_symbol(){
return symbol;
}
void Ant::move(Organism* gridArray[numOfRows][numOfColumns], Space spacesArray[]){
int decision = rand() % 4;
set_age(get_age() + 1);
if (decision == 0){
if ((get_first_index() - 1 >= 0) && (gridArray[get_first_index() - 1][get_second_index()]->get_symbol() == '-'))
{
gridArray[get_first_index() - 1][get_second_index()] = this;
gridArray[get_first_index()][get_second_index()] = &spacesArray[0];
set_first_index(get_first_index() - 1);
}
}
else if (decision == 1){
if ((get_second_index() + 1 <= 19) && (gridArray[get_first_index()][get_second_index() + 1]->get_symbol() == '-'))
{
gridArray[get_first_index()][get_second_index() + 1] = this;
gridArray[get_first_index()][get_second_index()] = &spacesArray[0];
set_second_index(get_second_index() + 1);
}
}
else if (decision == 2){
if ((get_first_index() + 1 <= 19) && (gridArray[get_first_index() + 1][get_second_index()]->get_symbol() == '-'))
{
gridArray[get_first_index() + 1][get_second_index()] = this;
gridArray[get_first_index()][get_second_index()] = &spacesArray[0];
set_first_index(get_first_index() + 1);
}
}
else if (decision == 3){
if ((get_second_index() - 1 >= 0) && (gridArray[get_first_index()][get_second_index() - 1]->get_symbol() == '-'))
{
gridArray[get_first_index()][get_second_index() - 1] = this;
gridArray[get_first_index()][get_second_index()] = &spacesArray[0];
set_second_index(get_second_index() - 1);
}
}
else{};
}
void Ant::breed(Organism* gridArray[numOfRows][numOfColumns], Ant antArray[], int &antCounter){
if(get_age() > 0 && get_age() % 3 == 0){
bool seenFlag = false;
int nextAvailIndex = find_next_available_index(antArray);
bool northCell = false, eastCell = false, southCell = false, westCell = false;
while(seenFlag == false && ((northCell == false) || (eastCell == false) || (southCell == false) || (westCell == false))){
int decision = rand() % 4;
if(decision == 0){
northCell = true;
if ((get_first_index() - 1 >= 0) && (gridArray[get_first_index() - 1][get_second_index()]->get_symbol() == '-'))
{
gridArray[get_first_index() - 1][get_second_index()] = &antArray[nextAvailIndex];
antArray[nextAvailIndex].set_first_index(get_first_index() - 1);
antArray[nextAvailIndex].set_second_index(get_second_index());
antArray[nextAvailIndex].set_life_status(true);
seenFlag = true;
}
}
else if(decision == 1){
eastCell = true;
if ((get_second_index() + 1 <= 19) && (gridArray[get_first_index()][get_second_index() + 1]->get_symbol() == '-')){
gridArray[get_first_index()][get_second_index() + 1] = &antArray[nextAvailIndex];
antArray[nextAvailIndex].set_first_index(get_first_index());
antArray[nextAvailIndex].set_second_index(get_second_index() + 1);
antArray[nextAvailIndex].set_life_status(true);
seenFlag = true;
}
}
else if (decision == 2){
southCell = true;
if ((get_first_index() + 1 <= 19) && (gridArray[get_first_index() + 1][get_second_index()]->get_symbol() == '-')){
gridArray[get_first_index() + 1][get_second_index()] = &antArray[nextAvailIndex];
antArray[nextAvailIndex].set_first_index(get_first_index() + 1);
antArray[nextAvailIndex].set_second_index(get_second_index());
antArray[nextAvailIndex].set_life_status(true);
seenFlag = true;
}
}
else if (decision == 3){
westCell = true;
if ((get_second_index() - 1 >= 0) && (gridArray[get_first_index()][get_second_index() - 1]->get_symbol() == '-')){
gridArray[get_first_index()][get_second_index() - 1] = &antArray[nextAvailIndex];
antArray[nextAvailIndex].set_first_index(get_first_index());
antArray[nextAvailIndex].set_second_index(get_second_index() - 1);
antArray[nextAvailIndex].set_life_status(true);
seenFlag = true;
}
}
}
}
}
Doodlebug::Doodlebug(): Organism(), symbol('X'), timeSinceMeal(0){};
void Doodlebug:: out_symbol() {
cout<<symbol;
}
char Doodlebug:: get_symbol(){
return symbol;
}
void Doodlebug:: set_time_since_meal(int newTime){
timeSinceMeal = newTime;
}
int Doodlebug:: get_time_since_meal() const{
return timeSinceMeal;
}
void Doodlebug:: move(Organism* gridArray[numOfRows][numOfColumns], Doodlebug doodleBugArray[], Space spacesArray[]){
set_age(get_age() + 1);
bool seenFlag = false;
bool northCell = false, eastCell = false, southCell = false, westCell = false;
while(seenFlag == false && ((northCell == false) || (eastCell == false) || (southCell == false) || (westCell == false))){
int decision = rand() % 4;
if(decision == 0){
northCell = true;
if ((get_first_index() - 1 >= 0) && (gridArray[get_first_index() - 1][get_second_index()]->get_symbol() == 'o'))
{
gridArray[get_first_index() - 1][get_second_index()]->set_life_status(false);
gridArray[get_first_index() - 1][get_second_index()]->set_age(0);
gridArray[get_first_index() - 1][get_second_index()] = this;
gridArray[get_first_index()][get_second_index()] = &spacesArray[0];
set_first_index(get_first_index() - 1);
set_time_since_meal(0);
seenFlag = true;
}
}
else if(decision == 1){
eastCell = true;
if ((get_second_index() + 1 <= 19) && (gridArray[get_first_index()][get_second_index() + 1]->get_symbol() == 'o')){
gridArray[get_first_index()][get_second_index() + 1]->set_life_status(false);
gridArray[get_first_index()][get_second_index() + 1]->set_age(0);
gridArray[get_first_index()][get_second_index() + 1] = this;
gridArray[get_first_index()][get_second_index()] = &spacesArray[0];
set_second_index(get_second_index() + 1);
set_time_since_meal(0);
seenFlag = true;
}
}
else if(decision == 2){
southCell = true;
if ((get_first_index() + 1 <= 19) && (gridArray[get_first_index() + 1][get_second_index()]->get_symbol() == 'o')){
gridArray[get_first_index() + 1][get_second_index()]->set_life_status(false);
gridArray[get_first_index() + 1][get_second_index()]->set_age(0);
gridArray[get_first_index() + 1][get_second_index()] = this;
gridArray[get_first_index()][get_second_index()] = &spacesArray[0];
set_first_index(get_first_index() + 1);
set_time_since_meal(0);
seenFlag = true;
}
}
else if(decision == 3){
westCell = true;
if ((get_second_index() - 1 >= 0) && (gridArray[get_first_index()][get_second_index() - 1]->get_symbol() == 'o')){
gridArray[get_first_index()][get_second_index() - 1]->set_life_status(false);
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