Initial commit.

martinruenz · martinruenz · commit 4fa99a061d38 · 2018-02-23T00:46:08.000Z
diff --git a/README.md b/README.md
@@ -1 +1,26 @@
-# gnuplot-cpp
+# gnuplot-cpp
+
+A trivial gnuplot interface for c++.
+
+There are [many](https://github.com/search?l=C%2B%2B&q=gnuplot&type=Repositories&utf8=%E2%9C%93) libraries providing the same solution, such as [gnuplot-iostream](https://github.com/dstahlke/gnuplot-iostream). _gnuplot-cpp_ aims at being lightweight and super easy to use. It functions by piping data to a gnuplot subprocess.
+
+## Features
+* Header only
+* Lightweight (~50 lines of code)
+* Easy to use
+
+## Example usage
+
+```
+#include "gnuplot.h"
+
+int main(){
+    GnuplotPipe gp;
+    gp.sendLine("plot [-pi/2:pi] cos(x),-(sin(x) > sin(x+1) ? sin(x) : sin(x+1))");
+    return 0;
+}
+```
+
+Result:
+
+![Example plot](example/example.jpg)
diff --git a/example/.gitignore b/example/.gitignore
@@ -0,0 +1,5 @@
+Debug/
+Default/
+Release/
+build/
+CMakeLists.txt.user
diff --git a/example/CMakeLists.txt b/example/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.0)
+project (gnuplot_cpp_example)
+set (CMAKE_CXX_STANDARD 11)
+
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/../include)
+add_executable(gnuplot_cpp_example example.cpp ../include/gnuplot.h)
diff --git a/example/example.cpp b/example/example.cpp
@@ -0,0 +1,7 @@
+#include "gnuplot.h"
+
+int main(){
+    GnuplotPipe gp;
+    gp.sendLine("plot [-pi/2:pi] cos(x),-(sin(x) > sin(x+1) ? sin(x) : sin(x+1))");
+    return 0;
+}
diff --git a/example/example.jpg b/example/example.jpg
diff --git a/include/gnuplot.h b/include/gnuplot.h
@@ -0,0 +1,73 @@
+/*
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * URL: https://github.com/martinruenz/gnuplot-cpp
+ * AUTHOR: Martin Rünz, 2015
+ */
+
+#pragma once
+
+#include <stdio.h>
+#include <string>
+#include <vector>
+#include <iostream>
+#include <fstream>
+
+class GnuplotPipe {
+public:
+    inline GnuplotPipe(bool persist = true) {
+        std::cout << "Opening gnuplot... ";
+        pipe = popen(persist ? "gnuplot -persist" : "gnuplot", "w");
+        if (!pipe)
+            std::cout << "failed!" << std::endl;
+        else
+            std::cout << "succeded." << std::endl;
+    }
+    inline virtual ~GnuplotPipe(){
+        if (pipe) pclose(pipe);
+    }
+
+    void sendLine(const std::string& text, bool useBuffer = false){
+        if (!pipe) return;
+        if (useBuffer)
+            buffer.push_back(text + "\n");
+        else
+            fputs((text + "\n").c_str(), pipe);
+    }
+    void sendEndOfData(unsigned repeatBuffer = 1){
+        if (!pipe) return;
+        for (unsigned i = 0; i < repeatBuffer; i++) {
+            for (auto& line : buffer) fputs(line.c_str(), pipe);
+            fputs("e\n", pipe);
+        }
+        fflush(pipe);
+        buffer.clear();
+    }
+    void sendNewDataBlock(){
+        sendLine("\n", !buffer.empty());
+    }
+
+    void writeBufferToFile(const std::string& fileName){
+        std::ofstream fileOut(fileName);
+        for (auto& line : buffer) fileOut << line;
+        fileOut.close();
+    }
+
+private:
+    GnuplotPipe(GnuplotPipe const&) = delete;
+    void operator=(GnuplotPipe const&) = delete;
+
+    FILE* pipe;
+    std::vector<std::string> buffer;
+};
