Форум атеистов Рунета

#include "bitmap_image.hpp"
#include <cstdio>
#include <cstdlib>
#include <fstream>
#include <time.h>

const int MIN_POINT = 10;
const int MAX_POINT = 10000;
const int KOF = 20;

int main(int argc, char *argv[])
{

    int n_points = 0;
    if (argc > 1)
        n_points = std::atoi(argv[1]);
    if (n_points < 10 || n_points > MAX_POINT || (argc != 3 && argc != 2)) {
        std::cerr << "usage:\n"
                  << argv[0] << " N path\n"
                  << "N\t- number of points from " << MIN_POINT << " to " << MAX_POINT
                  << "\npath\t- path to output bmp-file. Default output.bmp\n";
        return -1;
    }
    const char* path = "output.bmp";
    if (argc == 3)
        path = argv[2];
    /// initialize random seed
    srand(time(NULL));
    int* array = new int[n_points + 1];
    int max_x = 0;
    int x = 0;
    for (int i = 0; i < n_points; ++i) {
        /// generate random int from -1 to 1
        int n = rand() % 3 - 1;
        array[i] = n;
        x = x + n;
        if (x < 0)
            x = 0;
        if (x > max_x)
            max_x = x;
    }
    try
    {
        bitmap_image image(max_x * KOF, n_points);

        // set background to white
        image.set_all_channels(255,255,255);

        image_drawer draw(image);
        draw.pen_width(1);
        draw.pen_color(0,0,0);

        int x1 = 0;
        for (int i = 0; i < n_points; ++i) {
            int x2 = x1 + array[i];
            if (x2 < 0)
                x2 = 0;
            int y = n_points - i - 1;
            draw.line_segment(x1 * KOF, y, x2 * KOF, y);
            x1 = x2;
        }

        image.save_image(path); /// "output.bmp"
    }
    catch(...)
    {
        std::cerr << "Error!\n";
    }
    delete [] array;
    return 0;
}