code: добавлен вывод гистограммы svg и ее масштабирование

svg.cpp

@@ -0,0 +1,66 @@
+#include <iostream>
+#include <vector>
+#include "svg.h"
+
+void // ôóíêöèÿ âûâîäà çàãîëîâêà è îêîí÷àíèÿ SVG
+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::cout << "<rect x='" << x << "' y='" << y << "' width='" << width << "' height='" << height << " ' stroke='black' fill='#D499E6' ></rect>";
+}
+
+void
+show_histogram_svg(const std::vector<std::size_t>& bins){
+    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 auto MAX_ASTERISK = IMAGE_WIDTH - TEXT_WIDTH;
+
+    svg_begin(IMAGE_WIDTH, IMAGE_HEIGHT);
+
+    double top = 0;
+    std::size_t maxbin=bins[0];
+    for (std::size_t i=0; i < bins.size(); i++){
+        if (maxbin < bins[i]){
+            maxbin=bins[i];
+        }
+    }
+    if (maxbin<=76){
+        for (std::size_t i=0; i < bins.size(); i++) {
+            double bin_width = BLOCK_WIDTH * bins[i];
+            svg_text(TEXT_LEFT, top + TEXT_BASELINE, std::to_string(bins[i]));
+            svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT);
+            top += BIN_HEIGHT;
+        }
+        svg_end();
+    } else {
+        for (std::size_t i=0; i < bins.size(); i++) {
+            double bin_width= MAX_ASTERISK * (static_cast<double>(bins[i]) / maxbin);
+            svg_text(TEXT_LEFT, top + TEXT_BASELINE, std::to_string(bins[i]));
+            svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT);
+            top += BIN_HEIGHT;
+        }
+        svg_end();
+    }
+}

svg.h

@@ -0,0 +1,9 @@
+#ifndef SHOW_HISTOGRAM_SVG_H_INCLUDED
+#define SHOW_HISTOGRAM_SVG_H_INCLUDED
+
+#include <vector>
+
+void
+show_histogram_svg(const std::vector<std::size_t>& bins);
+
+#endif // SHOW_HISTOGRAM_SVG_H_INCLUDED

unittest.cpp

@@ -0,0 +1,21 @@
+#define DOCTEST_CONFIG_NO_MULTITHREADING
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+#include "histogram_internal.h"
+
+TEST_CASE("distinct positive numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1, 2}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 2);
+}
+TEST_CASE("empty vector"){
+    double min = 0;
+    double max = 0;
+    std::vector<double> numbers;
+    find_minmax(numbers, min, max);
+    CHECK(min == 0);
+    CHECK(max == 0);
+}
+