Moved the mandelbrot drawer to a class.

main.cpp

-#include <mpi.h>
-#include <iostream>
-#include <Magick++.h>
-#include <complex>
-#include <cmath>
-#include <sstream>
-#include <iomanip>
-
-#define IMG_WIDTH 10640
-#define IMG_HEIGHT 8000
-#define ITERATIONS 2000
-
-#define RE_MAX 1
-#define RE_MIN -2
-#define IM_MAX 1.4
-#define IM_MIN -1.3
-
-using namespace std;
-using namespace Magick;
-
-struct MandelResult
-{
-    float end_iterations;
-    bool belongs;
-
-    MandelResult(unsigned long end_iterations, bool belongs) :
-        end_iterations(end_iterations), belongs(belongs) {}
-};
-
-complex<double> GetPixelCoordinate(int x, int y)
-{
-    double re_size = abs(RE_MAX) + abs(RE_MIN);
-    double im_size = abs(IM_MAX) + abs(IM_MIN);
-
-
-    double re_pp = re_size / IMG_WIDTH;
-    double im_pp = im_size / IMG_HEIGHT;
-
-    return complex<double>(re_pp * x + RE_MIN, im_pp * y + IM_MIN);
-}
-
-
-MandelResult IsMandelbrotPoint(unsigned long x, unsigned long y, unsigned int iterations)
-{
-    complex<double> point = GetPixelCoordinate(x, y);
-    complex<double> series_value(0, 0);
-    
-    for (unsigned long i = 0; i < iterations; ++i)
-    {
-        if (real(series_value) * real(series_value) + imag(series_value) * imag(series_value) >= 4)
-            return MandelResult(i + 1 - log(log(abs(pow(series_value, 2) + point))) / log(2), false);
-
-        series_value= pow(series_value, 2) + point;
-    }
-
-    return MandelResult(iterations, true);
-}
-
-int main(int argc, char** argv)
-{
-    int id;
-    int procs;
-    float *calculated_values;
-    float *receive_buffer = nullptr;
-
-    MPI_Init(&argc, &argv);
-    MPI_Comm_size(MPI_COMM_WORLD, &procs);
-    MPI_Comm_rank(MPI_COMM_WORLD, &id);
-
-
-    int effective_height = IMG_HEIGHT;
-
-    // Calculate this threads working area.
-    effective_height /= procs;
-
-    calculated_values = new float[IMG_WIDTH * effective_height];
-
-    for (unsigned long y = effective_height * id; y < effective_height * (id + 1); ++y)
-    {
-        for (unsigned long x = 0; x < IMG_WIDTH; ++x)
-        {
-            MandelResult result = IsMandelbrotPoint(x, y, ITERATIONS);
-
-            calculated_values[(y - effective_height * id) * IMG_WIDTH + x] = result.end_iterations;
-        }
-    }
-
-    if (id == 0)
-        receive_buffer = new float[IMG_WIDTH * IMG_HEIGHT];
-
-    cout << "Process: " << id <<  ", Gathering!" << endl;
-    MPI_Gather(calculated_values, IMG_WIDTH * effective_height, MPI_FLOAT, receive_buffer,
-               IMG_WIDTH * effective_height, MPI_FLOAT, 0, MPI_COMM_WORLD);
-
-    cout << "Process: " << id << ", done gathering!" << endl;
-    
-    if (id == 0)
-    {
-        Image my_image(Geometry(IMG_WIDTH, IMG_HEIGHT), "white");
-        my_image.modifyImage();
-
-        Pixels pixel_cache(my_image);
-        PixelPacket *pixels = pixel_cache.get(0, 0, IMG_WIDTH, IMG_HEIGHT);
-
-        float max = 0;
-        for (unsigned long i = 0; i < IMG_WIDTH * IMG_HEIGHT; ++i)
-        {
-            if (receive_buffer[i] > max && receive_buffer[i] != ITERATIONS)
-                max = receive_buffer[i];
-        }
-
-        cout << max << endl;
-
-        cout << "Assembling image!" << endl;
-        for (unsigned long y = 0; y < IMG_HEIGHT; ++y)
-        {
-            cout << "Progress: " << setprecision(3) << 
-                static_cast<float>(y * 100) / IMG_HEIGHT << " %            \r" << flush;
-
-            for (unsigned long x = 0; x < IMG_WIDTH; ++x)
-            {
-                int iter_res = receive_buffer[y * IMG_WIDTH + x];
-                if (iter_res == ITERATIONS)
-                    pixels[y * IMG_WIDTH + x] = Color(MaxRGB * 0.55, MaxRGB * 0.35, MaxRGB * 0.6);
-                else
-                    pixels[y * IMG_WIDTH + x] = Color(MaxRGB * cosf(exp(iter_res)), 0, MaxRGB * sinf(exp(iter_res)));
-            }
-        }
-        pixel_cache.sync();
-        cout << "Progress: 100 %              " << endl;
-
-        stringstream ss;
-        ss << "output.png";
-
-        cout << "Saving image!" << endl;
-        my_image.write(ss.str());
-    }
-
-    delete[] calculated_values;
-    delete[] receive_buffer;
-
-    MPI_Finalize();
-}