* HELP! COMPUTER SCIENCE *

I know there is already a question answered like this from another post, however for this particular problem, the height is not included as a paramater, and I am having trouble implementing it into the class. Please provide comments if possible with the code. Thank you!!!

Create a c++ program implementing a class that represents ASCII art images and operations on them, respresented as two-dimensional char arrays allocated on the heap (using the new keyword).

Create a new C++ source file named canvas.cpp that implements the Canvas class, so that canvas.cpp and the provided files compile into a program that runs with no failed tests. The main.cpp and canvas.h are provided, these files are not to be edited only used to impement canvas.cpp file to allocate the arrays. Only use basic c++ statements: if/else, for loops, basic arrays, allocate arrays, pointers(using *), reference and dereference(using ampersand: &) ,keywords: new and delete. (

main.cpp file:

#include

#include

#include

#include "canvas.h"

using namespace std;

inline void _test(const char* expression, const char* file, int line)

{

cerr << "test(" << expression << ") failed in file " << file;

cerr << ", line " << line << "." << endl;

abort();

}

#define test(EXPRESSION) ((EXPRESSION) ? (void)0 : _test(#EXPRESSION, __FILE__, __LINE__))

void interactive_mode(char ink)

{

cout << "Enter a string and press Enter ";

cout << "to see the ASCII art version." << endl;

while (cin)

{

string line;

getline(cin, line);

string invalid_chars;

for (int i = 0; i < line.size(); ++i)

if (line[i] < 'A' || line[i] > 'D')

invalid_chars += line[i];

if (invalid_chars.size() > 0)

{

cout << " String contained invalid chars: ";

for (int i = 0; i < invalid_chars.size(); ++i)

{

cout << "'" << invalid_chars[i] << "'";

if (i != invalid_chars.size() - 1)

cout << ", ";

}

cout << "." << endl;

}

else if (line.size() > 0)

{

Canvas C(line);

C.replace('#', ink);

cout << C.to_string();

}

}

exit(0);

}

int main()

{

// Interactive mode.

// Uncomment the "interactive_mode..." line below to

// use your Canvas implementation interactively.

//

// The parameter specifies the character used to fill letters.

//

// interactive_mode('@');

// Test Canvas(int)

Canvas C1(3);

test(C1.width() == 3);

test(C1.to_string() == string(" ")

+ " "

+ " "

+ " "

+ " ");

Canvas C2(4);

test(C2.width() == 4);

test(C2.to_string() == string(" ")

+ " "

+ " "

+ " "

+ " ");

Canvas C3(7);

test(C3.width() == 7);

test(C3.to_string() == string(" ")

+ " "

+ " "

+ " "

+ " ");

// Test Canvas(char)

Canvas C4('A');

test(C4.width() == 5);

test(C4.to_string() == string(" ### ")

+ "# # "

+ "##### "

+ "# # "

+ "# # ");

Canvas C5('B');

test(C5.width() == 5);

test(C5.to_string() == string("#### ")

+ "# # "

+ "#### "

+ "# # "

+ "#### ");

Canvas C6('C');

test(C6.width() == 5);

test(C6.to_string() == string(" #### ")

+ "# "

+ "# "

+ "# "

+ " #### ");

Canvas C7('D');

test(C7.width() == 5);

test(C7.to_string() == string("#### ")

+ "# # "

+ "# # "

+ "# # "

+ "#### ");

Canvas C8('E');

test(C8.width() == 5);

test(C8.to_string() == string(" ")

+ " "

+ " "

+ " "

+ " ");

// Test replace()

C5.replace('#', '@');

test(C5.width() == 5);

test(C5.to_string() == string("@@@@ ")

+ "@ @ "

+ "@@@@ "

+ "@ @ "

+ "@@@@ ");

C5.replace(' ', '-');

test(C5.width() == 5);

test(C5.to_string() == string("@@@@- ")

+ "@---@ "

+ "@@@@- "

+ "@---@ "

+ "@@@@- ");

C5.replace('-', '@');

test(C5.width() == 5);

test(C5.to_string() == string("@@@@@ ")

+ "@@@@@ "

+ "@@@@@ "

+ "@@@@@ "

+ "@@@@@ ");

C5.replace('@', '$');

test(C5.width() == 5);

test(C5.to_string() == string("$$$$$ ")

+ "$$$$$ "

+ "$$$$$ "

+ "$$$$$ "

+ "$$$$$ ");

C6.replace(' ', '*');

test(C6.width() == 5);

test(C6.to_string() == string("*#### ")

+ "#**** "

+ "#**** "

+ "#**** "

+ "*#### ");

C7.replace('#', '*');

test(C7.width() == 5);

test(C7.to_string() == string("**** ")

+ "* * "

+ "* * "

+ "* * "

+ "**** ");

C8.replace('#', ' ');

test(C8.width() == 5);

test(C8.to_string() == string(" ")

+ " "

+ " "

+ " "

+ " ");

// Test add()

Canvas C9('A');

C9.add('C');

test(C9.width() == 12);

test(C9.to_string() == string(" ### #### ")

+ "# # # "

+ "##### # "

+ "# # # "

+ "# # #### ");

C9.add('B');

test(C9.width() == 19);

test(C9.to_string() == string(" ### #### #### ")

+ "# # # # # "

+ "##### # #### "

+ "# # # # # "

+ "# # #### #### ");

C9.add('D');

test(C9.width() == 26);

test(C9.to_string() == string(" ### #### #### #### ")

+ "# # # # # # # "

+ "##### # #### # # "

+ "# # # # # # # "

+ "# # #### #### #### ");

C9.add('!');

test(C9.width() == 33);

test(C9.to_string() == string(" ### #### #### #### ")

+ "# # # # # # # "

+ "##### # #### # # "

+ "# # # # # # # "

+ "# # #### #### #### ");

C9.add('C');

test(C9.width() == 40);

test(C9.to_string() == string(" ### #### #### #### #### ")

+ "# # # # # # # # "

+ "##### # #### # # # "

+ "# # # # # # # # "

+ "# # #### #### #### #### ");

// Test Canvas(string)

Canvas C10("ADD");

test(C10.width() == 19);

test(C10.to_string() == string(" ### #### #### ")

+ "# # # # # # "

+ "##### # # # # "

+ "# # # # # # "

+ "# # #### #### ");

Canvas C11("VBAD!");

test(C11.width() == 33);

test(C11.to_string() == string(" #### ### #### ")

+ " # # # # # # "

+ " #### ##### # # "

+ " # # # # # # "

+ " #### # # #### ");

Canvas C12("DAD CAB");

test(C12.width() == 47);

test(C12.to_string() == string("#### ### #### #### ### #### ")

+ "# # # # # # # # # # # "

+ "# # ##### # # # ##### #### "

+ "# # # # # # # # # # # "

+ "#### # # #### #### # # #### ");

cout << "Assignment complete." << endl;

}

canvas.h file

#ifndef CANVAS_H

#define CANVAS_H

#include

using namespace std;

// In this homework, you'll manipulate ASCII art images

// consisting of a rectangular grid of chararacter pixels.

class Canvas

{

public:

// Allocates a canvas of the given width and height 5 that

// consists entirely of ' ' (space) chars.

Canvas(int width);

// Allocates a canvas with width 5 and height 5 that looks like:

//

// ### #### #### ####

// # # # # # # #

// ##### or #### or # or # #

// # # # # # # #

// # # #### #### ####

//

// depending upon which character ('A', 'B', 'C', or 'D') is

// given as a parameter. If some other character is given,

// allocates a canvas of ' ' chars with width 5 and height 5.

Canvas(char x);

// Allocates a canvas containing the sequence of characters

// in the string with 2 columns of space between each pair

// of adjacent characters. For instance, Canvas("BADCAB")

// should yield:

//

// #### ### #### #### ### ####

// # # # # # # # # # # #

// #### ##### # # # ##### ####

// # # # # # # # # # # #

// #### # # #### #### # # ####

//

// Any characters in s not from {'A', 'B', 'C', 'D'} should be

// replaced with empty 5x5 space, just like previous constructor.

Canvas(string s);

// Returns the width of the canvas.

int width();

// Returns the entire canvas as a single string, consisting of each row

// of the canvas, followed by the newline character (' ').

string to_string();

// Replaces every instance in the canvas of old_char with new_char.

// For instance, if old_char is '#' and new char is '@'.

void replace(char old_char, char new_char);

// Adds a character to the Canvas's sequence of characters.

void add(char x);

// Destructor. Deallocates all of the memory allocated by the canvas

~Canvas();

private:

// A canvas is represented as a 2D char array, i.e.

// an array of pointers to char (sub)arrays.

// Each subarray corresponds to a column of the image.

char** C;

int _width;

};

#endif