code: финальная версия 2 вариант

svg.cpp

@@ -1,6 +1,7 @@
 #include <iostream>
 #include <vector>
 #include <string>
+#include <math.h>
 #include "svg.h"
 using namespace std;
 void
@@ -29,13 +30,6 @@ cout << "<rect x='"<<x<<"' y='"<<y<<"' width='"<<width<<"' height='"<<height<<"'
 
 }
 
-void color_find(double bin, int maxb, int& color){
-    color = (10 - (bin * 9) / maxb);
-    if (color < 0) { cout << "cant take color";
-    color = 9;
-    }
-}
-
 void
 show_histogram_svg(const vector<size_t>& bins) {
 
@@ -52,7 +46,7 @@ show_histogram_svg(const vector<size_t>& bins) {
     double top = 0;
     const size_t MAX_ASTERISK = IMAGE_WIDTH - TEXT_WIDTH;
     int maxb = bins[0];
-    int color;
+    int color_value;
 
     for (size_t j = 1; j < bins.size(); j++)
     {
@@ -65,7 +59,6 @@ show_histogram_svg(const vector<size_t>& bins) {
 
     double bin_width;
 
-    color_find(bin, maxb, color);
 
         if (maxb1 > MAX_ASTERISK)
         {
@@ -73,9 +66,12 @@ show_histogram_svg(const vector<size_t>& bins) {
         }
         else bin_width = BLOCK_WIDTH * bin;
 
-    svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
-    svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, "violet", to_string(color));
-    top += BIN_HEIGHT;
+             color_value = (10 - (bin * 9) / maxb);
+             string color = "#" + to_string(color_value) + to_string(color_value) + to_string(color_value);
+             svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
+             svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, "violet", color);
+             top += BIN_HEIGHT;
+
 }
 
     svg_end();

svg.h

@@ -3,7 +3,7 @@
 using namespace std;
 
 void
-color_find(double bin, int maxb, int& color);
+color_find(vector<size_t>& bins, int maxb, int& color);
 
 void
 svg_begin(double width, double height);

unittest.cpp

@@ -34,3 +34,16 @@ TEST_CASE("distinct negative numbers") {
     CHECK(min == -3);
     CHECK(max == -1);
 }
+
+
+TEST_CASE("take color"){
+    show_histogram_svg({1,2,3});
+    CHECK(color_value>0)
+}
+
+
+TEST_CASE("take color"){
+    show_histogram_svg({3,4,5,6});
+    CHECK(color_value<10)
+}
+