cs-lab03/text.cpp

#include <iostream>
#include "text.h"

const size_t screen_width = 80;
const size_t max_asterisk = screen_width - 3 - 1;

static void
find_max (const std::vector<std::size_t>& numbers, std::size_t& max) {
    max = numbers[0];
    for (double element : numbers) {
        if (element > max) {
            max = element;
        }
    }
}

void
show_histogram_text (const std::vector<std::size_t>& bins) {
    std::size_t max_bin;
    find_max(bins, max_bin);
    double modifier;

    /*
     * In case when maximum bin > 76, histogram will be scaled according to
     * the formula "max_asterisk * (static_cast<double>(bins[i]) / max_bin)"
     *          or "bins[i] * (static_cast<double>(max_asterisk) / max_bin)".
     * In other case, histogram won't be scaled, i.e, asterisk count depends on the current bin number.
     */

    if (max_bin > max_asterisk) {
        modifier = static_cast<double>(max_asterisk) / (max_bin);
    } else {
        modifier = 1;
    }

    for (std::size_t i = 0; i < bins.size(); ++i) {                                      //Histogram output with alignment, if necessary.
        if (bins[i] >= 10) {
            if (bins[i] >= 100) {
                std::cout << bins[i] << '|';
            }                                                                            //Output a three-digit number.
            else {
                std::cout << ' ' << bins[i] << '|';
            }                                                                           //Output a two-digit number with alignment.
        } else {
            std::cout << "  " << bins[i] << '|';
        }                              //Output a single-digit number with alignment.


        size_t height = modifier * bins[i];                                 //Height stands for the number of output asterisks.
        for (size_t k = 0; k < height; ++k) {
            std::cout << '*';
        }
        std::cout << "\n";
    }
}