I need to set boundaries for my C++ program but I am having troubles doing so. P

Question

I need to set boundaries for my C++ program but I am having troubles doing so. Please help if possible. Here is my code so far.

#include <iostream>

#include <cmath>

#include <fstream>

#include <iomanip>

#include <string>

using namespace std;

// So far, I am able to read in an image, copy the image and use the copy and draw dot function to change the position

// on each image in a loop I have set up. I haven't set up the boundaries though.

void readPGM(string fname, int &nc, int &nr, int &mv, int * &pix);

void writePGM(int nc, int nr, int mv, int *pix, int i);

void copy_img(string fname, int nc, int nr, int mv, int *&pix);

void draw_dot(int *pix, int i);

//const double gravity=-9.8;

int main()

{

int ncols = 0, nrows = 0, maxval = 255, frames;

int *pix = NULL;

double initpos, initveloc;

string fname, object, filewrite;

cout << "What is the name of your file? (.pgm) " << endl;

cin >> fname;

cout << "What is the object's initial position? (in pixels according to the size of your picture) " << endl;

cin >> initpos;

cout << "What is the object's initial velocity? (pixels/second) " << endl;

cin >> initveloc;

cout << "How many frames would you like? " << endl;

cin >> frames;

readPGM(fname, ncols, nrows, maxval, pix);

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?

?

?

?

for (int l = initpos; l

{

copy_img(fname, ncols, nrows, maxval, pix);

draw_dot(pix, l);

writePGM(ncols, nrows, maxval, pix, l);

if (l%ncols == 0 && l>ncols)

for (int l = initpos; l

{

?

copy_img(fname, ncols, nrows, maxval, pix);

draw_dot(pix, l);

?

writePGM(ncols, nrows, maxval, pix, l);

}

else

continue;

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?

?

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?

return 0;

}

}

void readPGM(string fname, int &nc, int &nr, int &mv, int * &pix)

{

ifstream ifs;

ifs.open(fname);

ifs.ignore(2, ' ');

ifs >> nc >> nr >> mv;

pix = new int[nc*nr];

int tempVal;

for (int i = 0; i < (nc*nr); i++)

{

ifs >> tempVal;

pix[i] = tempVal;

}

ifs.close();

}

void writePGM(int nc, int nr, int mv, int *pix, int i)

{

char fname[100];

sprintf(fname, "output%d.pgm", i);

ofstream ofs(fname);

//

if (!ofs)

{

cerr << "Error while attempting to create the file, " << fname << "." << endl;

return;

}

ofs << "P2" << endl << nc << " " << nr << endl << mv << endl;

int size = (nc*nr), count = 0;

while (count < size)

{

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

{

ofs << pix[count] << " ";

count++;

}

ofs << endl;

ofs.close();

}

}

void draw_dot(int *pix, int i)

{

pix[i] = 255;

}

void copy_img(string fname, int nc, int nr, int mv, int *&pix)

{

ifstream ifs;

ifs.open(fname);

ifs.ignore(2, ' ');

ifs >> nc >> nr >> mv;

pix = new int[nc*nr];

int tempVal;

for (int i = 0; i < (nc*nr); i++)

{

ifs >> tempVal;

pix[i] = tempVal;

}

ifs.close();

}

Explanation / Answer

#include <iostream>

#include <cmath>

#include <fstream>

#include <iomanip>

#include <string>

using namespace std;

void readPGM(string fname, int &nc, int &nr, int &mv, int * &pix);

void writePGM(int nc, int nr, int mv, int *pix, int i);

void copy_img(string fname, int nc, int nr, int mv, int *&pix);

void draw_dot(int *pix, int i);

int main( )

{

    int ncols=0, nrows=0, maxval=255;

    int *pix = NULL;        // instead of static int pix[1024*1024];

    string filename = get_filename( );

    readPGM(filename, ncols, nrows, maxval, pix);

    negatePGM(ncols, nrows, maxval, pix);

    writePGM("neg_"+filename, ncols, nrows, maxval, pix);

}

cout << "What is the name of your file? (.pgm) " << endl;

cin >> fname;

cout << "What is the object's initial position? (in pixels according to the size of your picture) " << endl;

cin >> initpos;

cout << "What is the object's initial velocity? (pixels/second) " << endl;

cin >> initveloc;

cout << "How many frames would you like? " << endl;

cin >> frames;

readPGM(fname, ncols, nrows, maxval, pix);

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?

?

?

?

for (int l = initpos; l<maxval;I++)

{

copy_img(fname, ncols, nrows, maxval, pix);

draw_dot(pix, l);

writePGM(ncols, nrows, maxval, pix, l);

if (l%ncols == 0 && l>ncols)

for (int l = initpos; l

{

?

copy_img(fname, ncols, nrows, maxval, pix);

draw_dot(pix, l);

?

writePGM(ncols, nrows, maxval, pix, l);

}

else

continue;

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?

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?

return 0;

}

}

void readPGM(string fname, int &nc, int &nr, int &mv, int * &pix)

{

ifstream ifs;

ifs.open(fname);

ifs.ignore(2, ' ');

ifs >> nc >> nr >> mv;

pix = new int[nc*nr];

int tempVal;

for (int i = 0; i < (nc*nr); i++)

{

ifs >> tempVal;

pix[i] = tempVal;

}

ifs.close();

}

void writePGM(int nc, int nr, int mv, int *pix, int i)

{

char fname[100];

sprintf(fname, "output%d.pgm", i);

ofstream ofs(fname);

//

if (!ofs)

{

cerr << "Error while attempting to create the file, " << fname << "." << endl;

return;

}

ofs << "P2" << endl << nc << " " << nr << endl << mv << endl;

int size = (nc*nr), count = 0;

while (count < size)

{

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

{

ofs << pix[count] << " ";

count++;

}

ofs << endl;

ofs.close();

}

}

void draw_dot(int *pix, int i)

{

pix[i] = 255;

}

void copy_img(string fname, int nc, int nr, int mv, int *&pix)

{

ifstream ifs;

ifs.open(fname);

ifs.ignore(2, ' ');

ifs >> nc >> nr >> mv;

pix = new int[nc*nr];

int tempVal;

for (int i = 0; i < (nc*nr); i++)

{

ifs >> tempVal;

pix[i] = tempVal;

}

ifs.close();

}

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