the fifth stage

lab01.cbp

@@ -36,7 +36,14 @@
 		<Unit filename="histogram.h">
 			<Option target="&lt;{~None~}&gt;" />
 		</Unit>
+		<Unit filename="histogram_internal.h">
+			<Option target="&lt;{~None~}&gt;" />
+		</Unit>
 		<Unit filename="main.cpp" />
+		<Unit filename="svg.cpp" />
+		<Unit filename="svg.h">
+			<Option target="&lt;{~None~}&gt;" />
+		</Unit>
 		<Unit filename="text.cpp" />
 		<Unit filename="text.h">
 			<Option target="&lt;{~None~}&gt;" />

main.cpp

@@ -2,6 +2,7 @@
 #include <vector>
 #include "histogram.h"
 #include "text.h"
+#include "svg.h"
 
 using namespace std;
 
@@ -36,6 +37,7 @@ int main()
 {
     auto in = input_data();
     auto bins = make_histogram(in.numbers, in.bin_count);
-    show_histogram_text(bins, in.bin_count);
+    //show_histogram_text(bins, in.bin_count);
+    show_histogram_svg(bins);
     return 0;
 }

svg.cpp

@@ -0,0 +1,74 @@
+#include "svg.h"
+
+using namespace std;
+
+void svg_begin(double width, double height)
+{
+    cout << "<?xml version='1.0' encoding='UTF-8'?>\n"
+         << "<svg "
+         << "width='" << width << "' "
+         << "height='" << height << "' "
+         << "viewBox='0 0 " << width << " " << height << "' "
+         << "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>";
+}
+
+void svg_rect(double x, double y, double width, double height, const string& stroke, const string& fill)
+{
+    cout << "<rect x='" << x
+         << "' y='" << y
+         << "' width='" << width
+         << "' height='" << height
+         << "' stroke='" << stroke
+         << "' fill='" << fill
+         << "' />\n";
+}
+
+void svg_end()
+{
+    cout << "</svg>\n";
+}
+void show_histogram_svg(const vector<size_t>& bins)
+{
+    const double IMAGE_WIDTH = 400;
+    const double IMAGE_HEIGHT = 300;
+    const double TEXT_LEFT = 20;
+    const double TEXT_BASELINE = 20;
+    const double TEXT_WIDTH = 50;
+    const double BIN_HEIGHT = 30;
+    const double BLOCK_WIDTH = 10;
+
+    svg_begin(IMAGE_WIDTH, IMAGE_HEIGHT);
+
+    size_t max_count = 0;
+    for (size_t count : bins)
+    {
+        if (count > max_count)
+        {
+            max_count = count;
+        }
+    }
+
+    double max_width = IMAGE_WIDTH - TEXT_WIDTH;
+    double top = 0;
+    for (size_t count : bins)
+    {
+        double bin_width;
+        if (max_count > 0)
+        {
+            bin_width = static_cast<double>(count) / max_count * max_width;
+        }
+        else
+        {
+            bin_width = 0.0;
+        }
+
+        svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(count));
+        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, "blue", "#aaffaa");
+        top += BIN_HEIGHT;
+    }
+    svg_end();
+}

svg.h

@@ -0,0 +1,10 @@
+#ifndef SVG_H_INCLUDED
+#define SVG_H_INCLUDED
+
+#include <iostream>
+#include <vector>
+#include <string>
+
+void show_histogram_svg(const std::vector<std::size_t>& bins);
+
+#endif // SVG_H_INCLUDED

unittest.cbp

@@ -31,6 +31,9 @@
 		<Compiler>
 			<Add option="-Wall" />
 		</Compiler>
+		<Unit filename="histogram.cpp" />
+		<Unit filename="histogram_internal.h" />
+		<Unit filename="unittest.cpp" />
 		<Extensions>
 			<lib_finder disable_auto="1" />
 		</Extensions>