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svg.cpp

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+#include <algorithm>
+#include <vector>
+#include "svg.h"
+#include <iostream>
+#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_end() {
+    cout << "</svg>\n";
+}
+
+void svg_text(double left, double baseline, const string &text) {
+    cout << "<text x='" << left << "' y='" << baseline
+         << "' font-family='Verdana' font-size='16'>" << text << "</text>\n";
+}
+
+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 << "' />\n";
+}
+
+void show_histogram_svg(const vector<size_t>& bins) {
+    const auto IMAGE_WIDTH = 800;
+    const auto IMAGE_HEIGHT = 600;
+    const auto TEXT_LEFT = 30;
+    const auto TEXT_BASELINE = 20;
+    const auto TEXT_WIDTH = 50;
+    const auto BIN_HEIGHT = 40;
+
+    svg_begin(IMAGE_WIDTH, IMAGE_HEIGHT);
+
+    size_t max_bin = 0;
+    if (!bins.empty()) {
+        max_bin = *max_element(bins.begin(), bins.end());
+    }
+
+
+    cout << "// Debug: max_bin = " << max_bin << endl;
+
+    double max_bar_width = IMAGE_WIDTH - TEXT_WIDTH ;
+    double scaling_factor = 1.0;
+    if (max_bin > 0) {
+        scaling_factor = max_bar_width / static_cast<double>(max_bin);
+
+        cout << "// Debug: scaling_factor = " << scaling_factor << endl;
+    }
+
+    double top = 0;
+    for (size_t bin : bins) {
+        double bar_width = bin * scaling_factor;
+        svg_text(TEXT_LEFT, top + TEXT_BASELINE, std::to_string(bin));
+        svg_rect(TEXT_WIDTH, top, bar_width, BIN_HEIGHT, "pink", "000000");
+        top += BIN_HEIGHT;
+    }
+
+    svg_end();
+}