From 7bb15b9746a30f2351b9eb308af84b43fbd48f8d Mon Sep 17 00:00:00 2001
From: Artem <TurkhanovAK@mpei.ru>
Date: Mon, 22 Apr 2024 00:17:18 +0300
Subject: [PATCH] =?UTF-8?q?code:=20=D1=81=D0=B4=D0=B5=D0=BB=D0=B0=D0=BD=20?=
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---
 histogram_internal.h |  3 +++
 svg.cpp              |  8 ++++++--
 svg.h                |  3 +++
 unittest.cpp         | 12 ++++++++++++
 4 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/histogram_internal.h b/histogram_internal.h
index 59c1874..7cfb60d 100644
--- a/histogram_internal.h
+++ b/histogram_internal.h
@@ -1,8 +1,11 @@
 #ifndef HISTOGRAM_INTERNAL_H_INCLUDED
 #define HISTOGRAM_INTERNAL_H_INCLUDED
 #include <vector>
+#include <string>
 
 void
 find_minmax(const std::vector<double>& numbers, double& min, double& max);
 
+std::string
+bin_color(size_t bin, size_t max_count);
 #endif // HISTOGRAM_INTERNAL_H_INCLUDED
diff --git a/svg.cpp b/svg.cpp
index 8d30bab..89fe2fe 100644
--- a/svg.cpp
+++ b/svg.cpp
@@ -28,6 +28,10 @@ svg_rect(double x, double y, double width, double height, string stroke, string
     cout << "<rect x = '" << x << "' y = '" << y << "' width = '" << width << "' height = '" << height << "' stroke = '" << stroke << "' fill = '" << fil << "' />";
 }
 
+string bin_color(size_t bin, size_t max_count){
+    return ("#" + to_string(10 - (bin * 9) / max_count) + to_string(10 - (bin * 9) / max_count) + to_string(10 - (bin * 9) / max_count));
+}
+
 void
 show_histogram_svg(const vector<size_t>& bins) {
     const auto IMAGE_WIDTH = 400;
@@ -46,12 +50,12 @@ show_histogram_svg(const vector<size_t>& bins) {
         }
     }
 
-
     double top = 0;
     for (size_t bin : bins) {
         const double bin_width = (IMAGE_WIDTH - TEXT_WIDTH) * bin / max_count;
+        const auto color = bin_color(bin,max_count);
         svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
-        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT,"red","#ffeeee");
+        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT,"grey", color);
         top += BIN_HEIGHT;
     }
     svg_end();
diff --git a/svg.h b/svg.h
index 86a4a8f..66a0f20 100644
--- a/svg.h
+++ b/svg.h
@@ -15,6 +15,9 @@ show_histogram_svg(const std::vector<size_t>& bins);
 void
 svg_text(double left, double baseline, std::string text);
 
+std::string
+bin_color(size_t bin, size_t max_count);
+
 void
 svg_rect(double x, double y, double width, double height, std::string stroke = "black", std::string fil = "black");
 
diff --git a/unittest.cpp b/unittest.cpp
index a9ba7e5..dbb684b 100644
--- a/unittest.cpp
+++ b/unittest.cpp
@@ -3,6 +3,8 @@
 #include "doctest.h"
 #include "histogram_internal.h"
 
+using namespace std;
+
 TEST_CASE("distinct positive numbers") {
     double min = 0;
     double max = 0;
@@ -10,3 +12,13 @@ TEST_CASE("distinct positive numbers") {
     CHECK(min == 1);
     CHECK(max == 2);
 }
+
+TEST_CASE("bin color") {
+    size_t max_bin = 10;
+    size_t min_bin = 3;
+    string rat = "#" + to_string(10 - (min_bin * 9) / max_bin) + to_string(10 - (min_bin * 9) / max_bin) + to_string(10 - (min_bin * 9) / max_bin);
+    auto test1 = bin_color(max_bin,max_bin);
+    auto test2 = bin_color(min_bin,max_bin);
+    CHECK(test1 == "#111");
+    CHECK(test2 == rat);
+}