build: histogram output

labor01.cpp

@@ -3,7 +3,7 @@
 #include "histogram.h"
 #include <algorithm>
 #include "text.h"
-
+#include "svg.h"
 
 using namespace std;
 struct Input {
@@ -34,7 +34,7 @@ input_data() {
 int main() {
     auto in = input_data();
     auto bins = make_histogram(in.numbers, in.bin_count);
-    show_histogram_text(bins, in.bin_count);
+    show_histogram_svg(bins);
 }
        
        

svg.cpp

@@ -0,0 +1,53 @@
+#include <iostream>
+#include <vector>
+#include <string>
+#include "svg.h"
+
+using namespace std;
+
+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) {
+    cout << "rect x='" << x << "' y=' " << y << "' width='" << width << "'height='" << height << "' />\n";
+}
+
+
+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_end() {
+    cout << "</svg>\n";
+}
+
+void
+show_histogram_svg(const vector<size_t>& bins) {
+    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;
+    double top = 0;
+    for (size_t bin : bins) {
+        const double bin_width = BLOCK_WIDTH * bin;
+        svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
+        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT);
+        top += BIN_HEIGHT;
+    }
+    svg_end();
+}
+
+
+

svg.h

@@ -0,0 +1,9 @@
+#ifndef SVG_H_INCLUDED
+#define SVG_H_INCLUDED
+
+#include <vector>
+
+void
+show_histogram_svg(const std::vector<size_t>& bins);
+
+#endif // SVG_H_INCLUDED