code: реализовано сохранение данных из сети в буфер

.gitignore

@@ -1,3 +1,8 @@
-lab03.cbp
+lab04.cbp
+/curl
 /bin
 /obj
+lab04.depend
+lab04.layout
+unittest.depend
+unittest.cbp

histogram.cpp

@@ -0,0 +1,45 @@
+#include "histogram.h"
+
+vector<size_t> make_histogram(const vector<double> &numbers, size_t bin_count) {
+    double min, max;
+    bool res = false;
+    find_minmax(numbers, min, max, res);
+    double bin_size = ( max - min ) / bin_count;
+    vector<size_t> bins ( 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;
+}
+
+
+void
+find_minmax(const vector <double> &numbers, double &min, double &max, bool &res) {
+
+    if (numbers.size()==0){
+        res = true;
+        return;
+    }
+
+    min = numbers[0];
+    max = numbers[0];
+    for ( double x : numbers ){
+        if ( x < min ){
+            min = x;
+        } else if ( x > max ){
+            max = x;
+        }
+    }
+}
+

histogram.h

@@ -0,0 +1,14 @@
+#ifndef HISTOGRAM_H_INCLUDED
+#define HISTOGRAM_H_INCLUDED
+
+#include <vector>
+
+using namespace std;
+
+vector<size_t>
+make_histogram(const std::vector<double>& numbers, size_t bin_count);
+
+void
+find_minmax(const vector <double> &numbers, double &min, double &max, bool &res);
+
+#endif // HISTOGRAM_H_INCLUDED

histogram_internal.h

@@ -0,0 +1,8 @@
+#ifndef HISTOGRAM_INTERNAL_H_INCLUDED
+#define HISTOGRAM_INTERNAL_H_INCLUDED
+#include <vector>
+
+void
+find_minmax(const std::vector<double>& numbers, double& min, double& max);
+
+#endif // HISTOGRAM_INTERNAL_H_INCLUDED

main.cpp

@@ -1,5 +1,13 @@
 #include <iostream>
 #include <vector>
+#include "histogram.h"
+#include "text.h"
+#include "svg.h"
+#include "show_svg.h"
+#include <curl/curl.h>
+#include <sstream>
+#include <string>
+
 using namespace std;
 
 struct Input {
@@ -7,134 +15,84 @@ struct Input {
     size_t bin_count{};
 };
 
-Input
+Input input_data(istream& stream, bool prompt) {
-input_data() {
+
-    Input in;
 
     size_t number_count;
-    cerr << "Enter quantity of numbers: ";
+    if (prompt) {
-    cin >> number_count;
+        cerr << "Enter number count: ";
+    }
+    stream >> number_count;
+
+    Input in;
 
-    vector<double> numbers(number_count);
     in.numbers.resize(number_count);
+
+    if (prompt){
             cerr << "Enter numbers: ";
-    for (size_t i = 0; i < number_count; i++) {
+    }
-        cin >> in.numbers[i];
+    for (size_t i = 0; i < number_count; i++)
+    {
+        stream >> in.numbers[i];
     }
 
-    cerr << "Enter bin count: ";
+    if (prompt){
-    cin >> in.bin_count;
+    cerr << "Enter number of bins: ";
+    }
+        stream >> in.bin_count;
 
     return in;
 }
 
-void
+size_t write_data(void* items, size_t item_size, size_t item_count, void* ctx) {
-find_minmax(const vector<double> numbers, double& min, double& max) {
+    size_t data_size = item_size * item_count;
-    min = numbers[0];
+    stringstream* buffer = reinterpret_cast<stringstream*>(ctx);
-    max = numbers[0];
+    auto text = reinterpret_cast<const char*>(items);
-    for (double x : numbers) {
+    buffer->write(text, data_size);
-        if (x < min) {
+    return data_size;
-            min = x;
-        }
-        else if (x > max) {
-            max = x;
-        }
-    }
 }
 
-vector <size_t>
+Input download(const string& address) {
-make_histogram(const vector<double> numbers, size_t bin_count) {
-    double min;
-    double max;
 
-    find_minmax(numbers, min, max);
+    stringstream buffer;
 
-    vector<size_t> bins(bin_count);
+    curl_global_init(CURL_GLOBAL_ALL);
-    double bin_size = (max - min) / bin_count;
+
-    for (size_t i = 0; i < numbers.size(); i++) {
+        CURL* curl = curl_easy_init();
-        bool found = false;
+
-        for (size_t j = 0; (j < bin_count - 1) && !found; j++) {
+        if(curl) {
-            auto lo = min + j * bin_size;
+
-            auto hi = min + (j + 1) * bin_size;
+            CURLcode res;
-            if ((lo <= numbers[i]) && (numbers[i] < hi)) {
+            curl_easy_setopt(curl, CURLOPT_URL, address.c_str());
-                bins[j]++;
+            curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
-                found = true;
+            curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
+            res = curl_easy_perform(curl);
+
+            if (res != CURLE_OK) {
+                curl_easy_strerror(res);
+                exit(1);
             }
+            curl_easy_cleanup(curl);
         }
-        if (!found) {
+    return input_data(buffer, false);
-            bins[bin_count - 1]++;
-        }
-    }
-    return bins;
 }
 
-void show_histogram_text(const vector<size_t> bins, size_t bin_count) {
-    const size_t SCREEN_WIDTH = 80;
-    const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
 
-    int max_count = 0;
-    for (int i =0; i<bin_count;i++){
-        if (bins[i]>max_count){
-            max_count=bins[i];
-        }
-    }
-    if (max_count>MAX_ASTERISK){
-        for (int i=0; i<bin_count; i++){
-            size_t height = MAX_ASTERISK * (static_cast<double>(bins[i]) / max_count);
-            if (bins[i]<10){
-                cout<<"  "<<bins[i]<<"|";
-                for (int j=0;j<height;j++){
-                    cout<<"*";
-                }
-                cout<<endl;
-            }
-            else if(bins[i]<100){
-                cout<<" "<<bins[i]<<"|";
-                for (int j=0;j<height;j++){
-                    cout<<"*";
-                }
-                cout<<endl;
-            }
-            else{
-                cout<<bins[i]<<"|";
-                for (int j=0;j<height;j++){
-                    cout<<"*";
-                }
-                cout<<endl;
-            }
 
-    }
+
+int main(int argc, char* argv[]){
+
+    Input in;
+    if (argc > 1) {
+        in = download(argv[1]);
     } else {
-        for (int i=0; i<bin_count; i++){
+        in = input_data(cin, true);
-            if (bins[i]<10){
-                cout<<"  "<<bins[i]<<"|";
-                for (int j=0;j<bins[i];j++){
-                    cout<<"*";
-                }
-                cout<<endl;
-            }
-            else if(bins[i]<100){
-                cout<<" "<<bins[i]<<"|";
-                for (int j=0;j<bins[i];j++){
-                    cout<<"*";
-                }
-            cout<<endl;
-            }
-            else{
-                cout<<bins[i]<<"|";
-                for (int j=0;j<bins[i];j++){
-                    cout<<"*";
-                }
-                cout<<endl;
     }
 
-        }
-    }
-}
 
-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);
+
+
     }

show_histogram.cpp

@@ -0,0 +1,38 @@
+#include "svg.h"
+
+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(IMAGE_WIDTH, IMAGE_HEIGHT);
+    double top = 0;
+    size_t longest;
+    if (!bins.empty()) {
+        longest = bins[0];
+    } else {
+        longest = 0;
+    }
+    for (size_t bin : bins) {
+        if (bin > longest) {
+            longest = bin;
+        }
+    }
+    for (size_t bin : bins) {
+            const double bin_width = BLOCK_WIDTH * bin;
+            if (bin == longest){
+                svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
+                svg_rect(TEXT_WIDTH, top, IMAGE_WIDTH - TEXT_WIDTH, BIN_HEIGHT, "#000000", "#ff00a2");
+                top += BIN_HEIGHT;
+            } else{
+                svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
+                svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, "#000000", "#ff00a2");
+                top += BIN_HEIGHT;
+            }
+    }
+    svg_end();
+}

show_svg.h

@@ -0,0 +1,10 @@
+#ifndef SHOW_SVG_H_INCLUDED
+#define SHOW_SVG_H_INCLUDED
+
+#include <vector>
+using namespace std;
+
+void
+show_histogram_svg(const vector<size_t>& bins);
+
+#endif // SHOW_SVG_H_INCLUDED

svg.cpp

@@ -0,0 +1,30 @@
+#include <iostream>
+#include <vector>
+#include <string>
+#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>";
+}
+
+void
+svg_rect(double x, double y, double width, double height, string stroke, string fill){
+    cout << "<rect x='"<< x <<"' y='"<< y <<"' width='"<< width <<"' height='"<< height <<"' stroke='"<< stroke <<"' fill='"<< fill <<"' />";
+}

svg.h

@@ -0,0 +1,13 @@
+#ifndef SVG_H_INCLUDED
+#define SVG_H_INCLUDED
+#include <vector>
+#include <iostream>
+using namespace std;
+void svg_begin(double width, double height);
+
+void svg_end();
+
+void svg_text(double left, double baseline, string text);
+
+void svg_rect(double x, double y, double width, double height, string stroke = "black", string fill = "black");;
+#endif // SVG_H_INCLUDED

text.cpp

@@ -0,0 +1,35 @@
+#include "text.h"
+#include <cstdio>
+#include <iostream>
+using namespace std;
+void
+show_histogram_text(vector<size_t>& bins, size_t & max_count,size_t & bin_count) {
+const size_t SCREEN_WIDTH = 80;
+const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
+if (max_count > MAX_ASTERISK){
+        vector<size_t> hights(bin_count);
+        for (size_t i = 0; i < bin_count; i++){
+            size_t height = MAX_ASTERISK * (static_cast<double>(bins[i]) / max_count);
+            hights[i] = height;
+        }
+
+        for (size_t i = 0; i < bin_count; i++){
+            printf("%3d|", bins[i]);
+            for (size_t j = 0; j < hights[i]; j++){
+                cout<<"*";
+            }
+            cout << endl;
+        }
+    }
+    else{
+        for (size_t i = 0; i < bin_count; i++)
+        {
+            printf("%3d|", bins[i]);
+            for (size_t j = 0; j < bins[i]; j++){
+                cout<<"*";
+            }
+            cout << endl;
+        }
+    }
+
+}

text.h

@@ -0,0 +1,11 @@
+#ifndef SHOW-SVG_H_INCLUDED
+#define SHOW-SVG_H_INCLUDED
+
+#include <vector>
+
+using namespace std;
+
+void
+show_histogram_text(vector<size_t>& bins, size_t & max_count,size_t & bin_count);
+
+#endif // SHOW-SVG_H_INCLUDED

unittest.cpp

@@ -0,0 +1,40 @@
+#define DOCTEST_CONFIG_NO_MULTITHREADING
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+#include "histogram_internal.h"
+
+TEST_CASE("distinct positive numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({}, min, max);
+    CHECK(min == 0);
+    CHECK(max == 0);
+}
+    TEST_CASE("distinct positive numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1, 2}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 2);
+}
+TEST_CASE("distinct positive numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 1);
+}
+TEST_CASE("distinct positive numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1,1,1,1,1,1,1,1,1}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 1);
+}
+TEST_CASE("distinct positive numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({-1.5,-2,-3,-4}, min, max);
+    CHECK(min == -4);
+    CHECK(max == -1.5);
+}