code: code with fun

histogram.cpp

@@ -0,0 +1,55 @@
+#include <iostream>
+#include <vector>
+#include "histogram.h"
+
+void find_minmax(const std::vector<double> &numbers, double &min, double &max)
+{
+    //min = numbers[0];
+    //max = numbers[0];
+    for (double x : numbers)
+    {
+
+        if (x < min)
+        {
+            min = x;
+        }
+
+        else if (x > max)
+        {
+            max = x;
+        }
+    }
+}
+
+std::vector<int> make_histogram(const std::vector<double>& numbers, size_t bin_count)
+{
+    std::vector<int> bins(bin_count);
+    int max_count = bins[0];
+    double min = numbers[0];
+    double max = numbers[0];
+
+    find_minmax(numbers, min, max);
+    double bin_size = (max - min) / bin_count;
+
+    for (size_t i = 0; i < numbers.size(); i++)
+    {
+        bool found = false;
+        for (size_t j = 0; (j < bin_count - 1) && !found; j++)
+        {
+            auto lo = min + j * bin_size;
+            auto hi = min + (j + 1) * bin_size;
+
+            if ((lo <= numbers[i]) && (numbers[i] < hi))
+            {
+                bins[j]++;
+                found = true;
+            }
+        }
+
+        if (!found)
+        {
+            bins[bin_count - 1]++;
+        }
+    }
+    return bins;
+}

histogram.h

@@ -0,0 +1,8 @@
+#ifndef HISTOGRAM_H_INCLUDED
+#define HISTOGRAM_H_INCLUDED
+#include <vector>
+
+std::vector<int>
+make_histogram(const std::vector<double>& numbers, size_t bin_count);
+
+#endif // HISTOGRAM_H_INCLUDED

svg.cpp

@@ -0,0 +1,71 @@
+#include <iostream>
+#include <vector>
+#include "svg.h"
+// #include"svg_rect.h"
+
+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)
+{
+    std::cout << "<?xml version='1.0' encoding='UTF-8'?>\n";
+    std::cout << "<svg ";
+    std::cout << "width='" << width << "' ";
+    std::cout << "height='" << height << "' ";
+    std::cout << "viewBox='0 0 " << width << " " << height << "' ";
+    std::cout << "xmlns='http://www.w3.org/2000/svg'>\n";
+}
+
+void svg_end()
+{
+    std::cout << "</svg>\n";
+}
+
+void svg_text(double left, double baseline, std::string text)
+{
+    // std::cout << "<text x='20' y='35'>text</text>";
+
+    std::cout << "<text x=' " << left << " ' y='" << baseline << "' > " << text << " </text>";
+
+    // std::cout << "<text x='20' y='" << baseline << "' >2</text>";
+}
+
+void svg_rect(double x, double y, double width, double height)
+{
+
+    std::cout << "<rect x='" << x << "' y='" << y << "' width='" << width << "' height='" << height << " ' stroke='yellow' fill='#9932CC' ></rect>";
+}
+
+void show_histogram_svg(const std::vector<int> &bins)
+{
+    const auto SCALE = (IMAGE_WIDTH - TEXT_WIDTH);
+    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(IMAGE_WIDTH, IMAGE_HEIGHT);
+    double top = 0;
+    for (size_t bin : bins)
+    {
+        double bin_width = BLOCK_WIDTH * bin;
+
+        if (bin_width > SCALE)
+        {
+            bin_width = SCALE;
+        }
+
+        svg_text(TEXT_LEFT, top + TEXT_BASELINE, std::to_string(bin));
+        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT);
+        top += BIN_HEIGHT;
+    }
+
+    svg_end();
+}

svg.h

@@ -0,0 +1,8 @@
+#ifndef SVG_H_INCLUDED
+#define SVG_H_INCLUDED
+#include <vector>
+
+void
+show_histogram_svg(const std::vector<int>& bins);
+
+#endif     //SVG_H_INCLUDED

text.cpp

@@ -0,0 +1,51 @@
+#include <iostream>
+#include <vector>
+#include "text.h"
+
+const size_t SCREEN_WIDTH = 80;
+const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
+
+
+void show_histogram_text(std::vector<int> &bins, size_t bin_count)
+{
+    int max_count = bins[0];
+    for (int i = 0; i < bin_count; i++)
+    {
+        if (bins[i] > max_count)
+        {
+            max_count = bins[i];
+        }
+    }
+    std::vector<double> height(bin_count);
+    for (int i = 0; i < bin_count; i++)
+    {
+        if (bins[i] > MAX_ASTERISK)
+        {
+            height[i] = (MAX_ASTERISK * bins[i]) / max_count;
+        }
+        else
+            height[i] = bins[i];
+    }
+
+    for (int i = 0; i < bin_count; i++)
+    {
+
+        if (bins[i] < 100)
+        {
+           std::cout << " ";
+        }
+
+        if (bins[i] < 10)
+        {
+            std::cout << " " ;
+        }
+
+        std::cout << bins[i] << "|";
+
+        for (int j = 0; j < height[i]; j++)
+        {
+            std::cout << "*";
+        }
+       std::cout << std::endl;
+    }
+}

text.h

@@ -0,0 +1,8 @@
+#ifndef TEXT_H_INCLUDED
+#define TEXT_H_INCLUDED
+#include <vector>
+
+void 
+show_histogram_text(std::vector<int> &bins, size_t bin_count);
+
+#endif // TEXT_H_INCLUDED