пункт 6: вывод гистограммы в SVG

sem2_lab1/histogram.cpp

@@ -1,6 +1,7 @@
 #include "histogram.h"
 using namespace std;
-static void find_minmax(const vector<double>& numbers, double& min, double& max) {
+void find_minmax(const vector<double>& numbers, double& min, double& max) {
+    if (numbers.size() == 0) return;
     min = numbers[0];
     max = numbers[0];
     for (double x : numbers)

sem2_lab1/sem2_lab1.cpp

@@ -5,6 +5,7 @@
 #include <vector>
 #include "histogram.h"
 #include "show_histogram.h"
+#include "svg.h"
 using namespace std;
 
 struct Input {
@@ -29,7 +30,7 @@ int main()
 {
     auto in = input_data();
     auto bins = make_histogram(in.numbers, in.bin_count);
-    show_histogram_text(bins);
+    show_histogram_svg(bins,in.numbers.size());
     return 0;
 }
 

sem2_lab1/sem2_lab1.vcxproj

@@ -130,6 +130,7 @@
     <ClCompile Include="histogram.cpp" />
     <ClCompile Include="sem2_lab1.cpp" />
     <ClCompile Include="show_histogram.cpp" />
+    <ClCompile Include="svg.cpp" />
   </ItemGroup>
   <ItemGroup>
     <None Include=".gitignore" />
@@ -138,6 +139,7 @@
     <ClInclude Include="histogram.h" />
     <ClInclude Include="histogram_internal.h" />
     <ClInclude Include="show_histogram.h" />
+    <ClInclude Include="svg.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">

sem2_lab1/sem2_lab1.vcxproj.filters

@@ -24,6 +24,9 @@
     <ClCompile Include="show_histogram.cpp">
       <Filter>Исходные файлы</Filter>
     </ClCompile>
+    <ClCompile Include="svg.cpp">
+      <Filter>Исходные файлы</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include=".gitignore" />
@@ -38,5 +41,8 @@
     <ClInclude Include="histogram_internal.h">
       <Filter>Файлы заголовков</Filter>
     </ClInclude>
+    <ClInclude Include="svg.h">
+      <Filter>Файлы заголовков</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>

sem2_lab1/svg.cpp

@@ -0,0 +1,52 @@
+#include <iostream>
+#include <vector>
+#include <string>
+
+using namespace std;
+void svg_begin(double width, double height) {
+    cout << "<?xml version='1.0' encoding='UTF-8'?>\n";
+    cout << "<svg ";
+    cout << "width='" << width << "' ";
+    cout << "height='" << height << "' ";
+    cout << "viewBox='0 0 " << width << " " << height << "' ";
+    cout << "xmlns='http://www.w3.org/2000/svg'>\n";
+}
+void svg_text(double left, double baseline, string text) {
+    cout << "<text x='" << left << "' y='" << baseline<< "'>" << text << "</text>" << endl;
+}
+void svg_end() {
+    cout << "</svg>\n";
+}
+void svg_rect(double x, double y, double width, double height,string stroke = "black", string fill = "green")
+{
+    cout << "<rect x='" << x << "' y='" << y << "' width='" << width << "' height='" << height << "' fill='" << fill << "' stroke='" << stroke << "' />";
+}
+void show_histogram_svg(const vector<double>& bins, int number_cnt) {
+    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;
+    string colors[] {"#0000ff","#00ff00","#ff0000" ,"#00ffff" ,"#ff00ff" ,"#ffff00","#ffffff","#aaaaaa" };
+    svg_begin(400, 300);
+    double top = 0;
+    int color_ptr=0;
+    double max = bins[0];
+    for (size_t bin : bins) if (bin > max) max = bin;
+    cout << max;
+    double k = (IMAGE_WIDTH - TEXT_WIDTH) / max;
+    for (size_t bin : bins) {
+        const double bin_width = k * bin;
+        svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
+        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT,"black",colors[color_ptr]);
+        top += BIN_HEIGHT;
+        color_ptr++;
+        if (color_ptr >= colors->size()) color_ptr = 0;
+    }
+
+    svg_end();
+
+}
+

sem2_lab1/svg.h

@@ -0,0 +1,3 @@
+#pragma once
+#include <vector>
+void show_histogram_svg(const std::vector<double>& bins,int number_cnt);