cs-lab03/text.cpp

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

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 > 76) {modifier = static_cast<double>(74) / (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";
    }
}