add cmake example build

CMakeLists.txt

@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.9)
+project(plotpipe)
+
+# set(CMAKE_CXX_STANDARD 11)
+
+set(SOURCE_FILES
+        main.cpp)
+
+add_executable(plotpipe ${SOURCE_FILES})

README.md

@@ -3,7 +3,7 @@ plotpipe
 
 Simple C++ class for quick & dirty real-time plotting via a pipe to gnuplot
 
-Right now it's just a simple header file that allows plotting a vector of one-d or two-d data that can refresh as your program runs. I designed it for scientific computing in mind, but it might be useful in many contexts.
+Right now it's just a simple header file **graph.h** that allows plotting a vector of one-d or two-d data that can refresh as your program runs. I designed it for scientific computing in mind, but it might be useful in many contexts.
 
 Note: right now it depends on linux (not familiar with windows pipe commands), and requires an installation of gnuplot.
 
@@ -28,3 +28,15 @@ Here's how it's used:
 	}
 
 This example will just plot a quadratic function, and scroll over time with a moving window over the function.
+
+### Example
+
+```bash
+git clone https://github.com/jal278/plotpipe.git
+cd plotpipe/
+mkdir build
+cd build
+cmake ..
+make
+./plotpipe
+```

main.cpp

@@ -0,0 +1,17 @@
+#include <vector>
+#include "graph.h"
+
+using namespace std;
+
+int main(int argc,char **argv) {
+    plot p;
+    for(int a=0;a<100;a++) {
+        vector<float> x, y;
+        for (int k = a; k < a + 200; k++) {
+            x.push_back(k);
+            y.push_back(k * k);
+        }
+        p.plot_data(x, y);
+    }
+    return 0;
+}