sourcesvg: добавлена функция создания гистограммы в SVG и учтен пустой массив

svg.cpp

@@ -35,3 +35,50 @@ void svg_rect(double x, double y, double width, double height, string stroke, st
     cout << "<rect x='" << x << "' y='" << y << "' width='" << width;
     cout << "' height='" << height << "' stroke='" << stroke << "' fill='" << fill << "'/>";
 }
+
+//  Ñîçäàíèå ãèñòîãðàììû íà îñíîâàíèè êîðçèí â ôîðìàòå SVG.
+
+void show_histogram_svg(const vector<size_t>& bins)
+{
+//  Íåîáõîäèìûå êîíñòàíòû.
+
+    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
+    size_t max_bins = bins[0];
+
+svg_begin(IMAGE_WIDTH, IMAGE_HEIGHT);
+
+//  Ïîèñê ìàêñèìàëüíîé êîðçèíû.
+
+    for (size_t x: bins)
+        if (x > max_bins)
+            max_bins = x;
+
+// Ïðîâåðêà ìàêñèìàëüíîãî çíà÷åíèÿ è ñîçäàíèå ãèñòîãðàììû.
+
+    if (max_bins == 0)
+        {
+            string message = "The count of numbers or columns is zero.";
+            svg_text(TEXT_LEFT, TEXT_BASELINE, message);
+        }
+    else
+        {
+            const auto BLOCK_WIDTH = (IMAGE_WIDTH - TEXT_WIDTH)/max_bins;
+            double top = 0;
+
+            for (size_t bin : bins)
+                {
+                    const double bin_width = BLOCK_WIDTH * bin;
+                    svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
+                    svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT);
+                    top += BIN_HEIGHT;
+                }
+
+        }
+    svg_end();
+}