build: 5. Вывод гистограммы как изображения в формате SVG. Добавлены файлы для работы с форматом SVG.

main.cpp

@@ -4,6 +4,7 @@
 #include <conio.h>
 #include "histogram.h"
 #include "text.h"
+#include "svg.h"
 using namespace std;
 struct Input {
     vector<double> numbers;
@@ -24,7 +25,5 @@ input_data(){
 int main(){
 	auto in = input_data();
 	auto bins = make_histogram(in.numbers, in.bin_count);
-    show_histogram_text(in.bin_count, bins);
-	getch();
-	return 0;
+    show_histogram_svg(bins);
 }

marks.txt

@@ -0,0 +1,3 @@
+10
+3 3 4 4 4 4 4 5 5 5
+3

marks_svg.bat

@@ -0,0 +1 @@
+lab1.exe <marks.txt >marks.svg

svg.cpp

@@ -0,0 +1,50 @@
+#include <iostream>
+#include <vector>
+#include <cmath>
+#include "svg.h"
+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, string text){
+    cout << "<text x='" << left << "' y='" << baseline << "' >" << 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 << "'/>";
+}
+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;
+    svg_begin(400, 300);
+    const size_t MAX_DOT = IMAGE_WIDTH - TEXT_WIDTH;
+    double MAX_BIN = bins[0];
+    for (size_t j = 1; j < bins.size(); j++){
+        if (bins[j] > MAX_BIN) MAX_BIN = bins[j];
+    }
+    double top = 0;
+    for (size_t bin : bins) {
+        double bin_width = BLOCK_WIDTH * bin;
+        if (bin == MAX_BIN){
+            bin_width = MAX_DOT;
+        }
+        else bin_width = ceil(MAX_DOT * (bin / MAX_BIN));
+        svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
+        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, "black", "cyan");
+        top += BIN_HEIGHT;
+    }
+    svg_end();
+}

svg.h

@@ -0,0 +1,7 @@
+#ifndef SVG_H_INCLUDED
+#define SVG_H_INCLUDED
+#include <vector>
+
+void show_histogram_svg(const std::vector<size_t>& bins);
+
+#endif // SVG_H_INCLUDED