code: добавлен файл реализации svg

svg.cpp

@@ -0,0 +1,76 @@
+#include "svg.h"
+#include <iostream>
+#include <string>
+#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>\n";
+}
+
+void svg_rect(double x, double y, double width, double height, std::string stroke, std::string fill){
+    std::cout << "<rect x='" << x << "' y='" << y << "' width='" << width << "' height='" << height
+    << "' stroke='" << stroke << "' fill='" << fill << "' />\n";
+}
+
+
+void
+show_histogram_svg(const std::vector<size_t>& bins, const std::string& fill, const std::string& stroke) {
+    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(IMAGE_WIDTH, IMAGE_HEIGHT);
+
+    size_t maxlen = 0;
+    for (size_t len : bins)
+    {
+        if (maxlen<len) maxlen = len;
+    }
+
+    double top = 0;
+    for (size_t bin : bins) {
+        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, stroke, fill);
+        top += BIN_HEIGHT;
+    }
+    /*
+    double top = 0;
+    for (size_t bin : bins) {
+        const double bin_width = BLOCK_WIDTH * bin;
+        svg_text(TEXT_LEFT, top + TEXT_BASELINE, std::to_string(bin));
+        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, stroke, fill);
+        top += BIN_HEIGHT;
+    }
+
+    //svg_text(20, 20, std::to_string(bins[0]));
+    //svg_rect(50, 0, bins[0] * 10, 30);*/
+    svg_end();
+}