Image

[Repeater]

Every pixel gets swapped twice. You swap the first pixel and the last pixel.... and at the end, you swap the last pixel and the first pixel.

Edit: As LC says, you also aren't calling the function :p

[lastchance]

Well, you haven't actually called the routine that you presumably intend to rotate the image.

[lastchance]

JLewise wrote:

how will I go about calling this function then

rotatedImage(PixelGrid);
Somewhere around line 47.

what should I remove so that I am not swapping the pixels at the start and finish

Many ways. If it's not square then maybe just guide it with the top half:
for (row = 0; row < WIDTH / 2; row++)
(EDIT - needs a bit more thought if WIDTH is odd. Hmm.)



I'm getting mighty confused by WIDTH describing the number of rows and HEIGHT the number of columns. Somebody in your other thread has already said that, I think.

Where are WIDTH and HEIGHT defined? Your code isn't legitimate C++ unless they are constants, which rather limits the number of pictures you are going to deal with.

[lastchance]

@JLewis
Please don't remove the code from your post once you have got an answer. It removes any educational purpose to the forum.

It would appear you did exactly the same here:
https://stackoverflow.com/questions/53352794/c-programming-of-the-function
which will make you about as popular on that forum as here.

[Repeater]

Although of course, they keep it forever, https://stackoverflow.com/posts/53352794/revisions

[Repeater]

God bless SO. They brought the whole thing back.

This isn't quite what was posted here; in the original post here, the rotate function wasn't actually called. Still, pretty close.

I am quite new to C++.

I have a PNG image which I am trying to rotate by 180 degrees.

The image is to be saved as a new file.

I have wrote out a bit of code but hit a brick wall, any tips for how to continue would be appreciated. Code so far is below, thanks in advance.

#include <QCoreApplication>
#include <iostream>
#include "ImageHandle.h"

using namespace std;

void rotatedImage (unsigned PixelGrid[WIDTH][HEIGHT]);

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
const char LogoFile[] = "Airplane.png";

unsigned PixelGrid[WIDTH][HEIGHT];     // Image loaded from file

// If the file cannot be loaded ...
if (!loadImage(PixelGrid, LogoFile))
{
    // Display an error message
    cout << "Error loading file \"" << LogoFile << "\"" << endl;
}
else
{
    cout << "File \"" << LogoFile << "\" opened successfully" << endl;

    // Demo of use of saveImage - to create a copy as "Airplane.png"
    // This should be modified to save the new images as specified
    if (saveImage(PixelGrid, "AirplaneCopy.png"))
    {
        cout << "File \"AirplaneCopy.png\" saved successfully" << 
endl;
    }
    else
    {
        cout << "Could not save \"AirplaneCopy.png\"" << endl;
    }
}

rotatedImage(PixelGrid);

{
    if (saveImage(PixelGrid, "AirplaneRotated.png"))
    {
        cout << "\nFile\"AirplaneRotated.png\" saved successfully" << 
endl;
    }
    else
    {
        cout << "\nCould not save \"AirplaneRotated.png\"" << endl;
    }
}

return a.exec();
}

void rotatedImage (unsigned PixelGrid[WIDTH][HEIGHT])
{
int row;
int col;

for (row = 0; row < WIDTH; row++)
{
    for (col = 0; col < HEIGHT; col++)
    {
        PixelGrid[row][col] = 
    }
}
}

[lastchance]

Good detective work! Given the number of deleted posts in the last week it would be nice to have similar here. Google cache is a bit hit-and-miss.

In this instance the OP has chosen to fly his upside-down aircraft somewhere else.