diff --git a/main.cpp b/main.cpp
index 3d36cf2..6c5421b 100644
--- a/main.cpp
+++ b/main.cpp
@@ -17,14 +17,16 @@
 
 using namespace cv;
 using namespace std;
+using namespace std::chrono;
+using time_stamp = time_point<system_clock, microseconds>;
 
 Mat image;
 GLuint imageTexture;
 GLint screenWidth = 0;
 GLint screenHeight = 0;
- 
-void displayMe(void)
-{
+time_stamp ts;
+
+void getScreenDimensions () {
   if (screenWidth == 0 && screenHeight == 0) {
     GLint dims[4] = {0};
     glGetIntegerv(GL_VIEWPORT, dims);
@@ -32,6 +34,11 @@ void displayMe(void)
     screenHeight = dims[3];
     cout << screenWidth << "," << screenHeight << endl;
   }
+}
+ 
+void displayMe(void)
+{
+  getScreenDimensions();
 
   string image_path = samples::findFile("chart.png");
   Mat image = imread(image_path, IMREAD_COLOR);
@@ -47,7 +54,7 @@ void displayMe(void)
     glColor3f(1, 0, 0); glVertex3f(-1.0, -1.0, 0.5);
     glColor3f(0, 1, 0); glVertex3f(1.0, -1.0, 0);
     glColor3f(0, 0, 1); glVertex3f(1.0, 1.0, 0);
-    glVertex3f(-1.0, 1.0, 0);
+    glColor3f(0, 0, 0); glVertex3f(-1.0, 1.0, 0);
   glEnd();
 
   // Flush drawing command buffer to make drawing happen as soon as possible.
@@ -56,15 +63,12 @@ void displayMe(void)
  
 int main(int argc, char** argv)
 {
- 
+    ts = time_point_cast<microseconds>(system_clock::now());
     glutInit(&argc, argv);
     glutInitDisplayMode(GLUT_SINGLE);
     glutCreateWindow("opengl_opencv_example");
     glutFullScreen();
     glutDisplayFunc(displayMe);
     glutMainLoop();
-
-    
-    
     return 0;
 }
\ No newline at end of file