code: разделение кода на файлы

main.cpp

@@ -2,6 +2,7 @@
 #include <vector>
 #include "histogram.h"
 #include "text.h"
+#include "svghis.h"
 
 using namespace std;
 
@@ -25,10 +26,10 @@ input_data() {
 
 int main()
 {
-
     auto in = input_data();
     auto stolb = make_histogram(in.numbers, in.bucket, in.number_count);
     show_histogram_text(stolb, in.bucket);
+    show_histogram_svg(stolb);
 
     return 0;
 }

svghis.cpp

@@ -0,0 +1,70 @@
+#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();
+}

svghis.h

@@ -0,0 +1,10 @@
+#ifndef SVGHIS_H_INCLUDED
+#define SVGHIS_H_INCLUDED
+
+#include <vector>
+#include "svghis.cpp"
+
+void
+show_histogram_svg(const std::vector<size_t>& stolb);
+
+#endif // SVGHIS_H_INCLUDED

unittest.cpp

@@ -0,0 +1,36 @@
+#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("distinct negative numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({-1, -2}, min, max);
+    CHECK(min == -2);
+    CHECK(max == -1);
+}
+
+TEST_CASE("one element") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 1);
+}
+
+TEST_CASE("same numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1, 1}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 1);
+}