From 585dbf0f5a61e9ef2db8891faf6d407c8e294161 Mon Sep 17 00:00:00 2001
From: LyzhinAK <LyzhinAK@mpei.ru>
Date: Mon, 5 May 2025 13:47:09 +0300
Subject: [PATCH] =?UTF-8?q?build:=20=D1=84=D0=B0=D0=B9=D0=BB=20=D1=80?=
 =?UTF-8?q?=D0=B5=D0=B0=D0=BB=D0=B8=D0=B7=D0=B0=D1=86=D0=B8=D0=B8=20svg?=
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---
 svghis.cpp | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 svghis.cpp

diff --git a/svghis.cpp b/svghis.cpp
new file mode 100644
index 0000000..1121748
--- /dev/null
+++ b/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();
+}