cs-lab03/lab01/svghis.cpp

#include <vector>

void
svg_begin(double width, double height) {
    std::cout << "<?xml version='1.0' encoding='UTF-8'?>\n";
    std::cout << "<svg ";
    std::cout << "width='" << width << "' ";
    std::cout << "height='" << height << "' ";
    std::cout << "viewBox='0 0 " << width << " " << height << "' ";
    std::cout << "xmlns='http://www.w3.org/2000/svg'>\n";
}

void
svg_end() {
    std::cout << "</svg>\n";
}

void
svg_text(double left, double baseline, std::string text) {
    std::cout << "<text x='" << left
         << "' y='" << baseline
         << "'>" << text << "</text>";
}

void svg_rect(double x, double y, double width, double height,
              std::string stroke = "red", std::string fill = "#79553D") {
    std::cout << "<rect x='" << x
         << "' y='" << y
         << "' width='" << width
         << "' height='" << height
         << "' stroke='" << stroke
         << "' fill='" << fill
         << "' />";
}

void
show_histogram_svg(const std::vector<size_t>& stolb) {
    const auto IMAGE_WIDTH = 400;
    const auto IMAGE_HEIGHT = 300;
    const auto TEXT_LEFT = 20;
    const auto TEXT_BASELINE = 20;
    const auto TEXT_WIDTH = 50;
    const auto BIN_HEIGHT = 30;
    const auto BLOCK_WIDTH = 10;

    const size_t MAX_ASTERISK = IMAGE_WIDTH - TEXT_WIDTH;

    svg_begin(400, 300);

    size_t maxlen = 0;
    for (size_t len : stolb)
    {
        if (maxlen<len) maxlen = len;
    }

    double top = 0;
    for (size_t bin : stolb) {
        size_t wight = bin;
        if ((maxlen*10) > MAX_ASTERISK){
            if (maxlen != bin) wight = MAX_ASTERISK * (static_cast <double> (bin/maxlen));
            else if (maxlen == bin) wight = MAX_ASTERISK;
        }
        const double bin_width = BLOCK_WIDTH * wight;
        svg_text(TEXT_LEFT, top + TEXT_BASELINE, std::to_string(bin));
        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT);
        top += BIN_HEIGHT;
    }

    svg_end();
}