用opengl画一个图

我想用我的代码创建一个图形(2d图形)，如何在opengl中制作一个简单的2d图形?我是新的opengl，所以也许你可以解释我是如何工作的代码，请。下面是我的代码:

    #include <iostream>
using namespace std;
int main ()
{
      double dt = 0.10;    //(it is constant)
      double t = 0.00;
      double dx = 0.10;    //(it is constant)
      double x = 0.00;
      double ddy = 1.00;   //(it is constant)
      double dy = 0.00;
      double y = 1.00;
      cout<<"t   = "<<t<<endl;
      cout<<"dx  = "<<dx<<endl;
      cout<<"x   = "<<x<<endl;
      cout<<"dy  = "<<dy<<endl;
      cout<<"y   = "<<y<<endl;
      cout<<endl;
      while(t<=5) 
      {
                  x = x + dx*dt;
                  dy = dy - ddy * dt * dt;
                  y = y + dy * dt;
                  if (y<=-1)
                  {
                             y = -y;
                             dy = -dy * 0.70;
                  }
      t  = t + dt;
      cout<<"t   = "<<t<<endl;
      cout<<"dx  = "<<dx<<endl;
      cout<<"x   = "<<x<<endl;
      cout<<"dy  = "<<dy<<endl;
      cout<<"y   = "<<y<<endl;
      cout<<endl;
      }
      system("pause");
}