svg output

main.cpp

@@ -1,6 +1,6 @@
 #include <iostream>
 #include "histogram.h"
-#include "text.h"
+#include "svg.h"
 #include <vector>
 
 using namespace std;
@@ -28,6 +28,6 @@ Input input_data()
 int main() {
     Input in = input_data();
     auto bins = make_histogram(in.numbers, in.bin_count);
-    show_histogram_text(bins);
+    show_histogram_svg(bins);
     return 0;
 }

svg.cpp

@@ -0,0 +1,63 @@
+#include <iostream>
+#include "svg.h"
+
+using namespace std;
+
+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;
+
+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
+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, string stroke = "black", string fill = "black"){
+    cout << "<rect x='" << x << "' y='" << y << "' width='" << width << "' height='" << height << "' stroke='" << stroke << "' fill='" << fill << "' />";
+}
+
+
+void
+show_histogram_svg(const vector<size_t>& bins) {
+    double max = 0;
+    int maxlen = IMAGE_WIDTH - TEXT_WIDTH;
+    for (auto el: bins) {
+        if (max < el) {
+            max = el;
+        }
+    }
+    double scale = max * BLOCK_WIDTH / maxlen;
+
+    svg_begin(IMAGE_WIDTH, IMAGE_HEIGHT);
+    string stroke[] = {"red", "green", "blue"};
+    string fill[] = {"red", "green", "blue"};
+    int i = 0;
+    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 / scale, BIN_HEIGHT, stroke[i], fill[i]);
+        top += BIN_HEIGHT;
+        i++;
+    }
+    svg_end();
+}

svg.h

@@ -0,0 +1,4 @@
+#pragma once
+#include <vector>
+
+void show_histogram_svg(const std::vector<size_t>& bins);