title: Drawing connected lines with OpenGL
body: <p>I'm drawing convex polygons with OpenGL. I then do the same thing but use GL_LINE_LOOP.
  The problem I have is the lines are not always connected. How could I ensure that the lines are always connected?</p>
  
  <p>In the photo below, Iv highlighted in green, the corners that are connected and in red, those that are not. I would like for them to be all like the green ones.</p>
  
  <p><a href="http://img249.imageshack.us/i/notconnected.png/" rel="nofollow noreferrer">http://img249.imageshack.us/i/notconnected.png/</a></p>
  
  <p>Thanks</p>
  
  <pre><code>glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
  x ++;
  glLineWidth(50.0);
  
  glPushMatrix();
  glTranslatef(250,250,0);
      glBegin(GL_POLYGON); //Begin quadrilateral coordinates
  
      //Trapezoid
      glColor3f(255,0,0);
  glVertex2f(-10,0);
  glVertex2f(50,0);
  glColor3f(255,100,0);
  glVertex2f(100,50);
  glVertex2f(mouse.x - 250,mouse.y - 250);
  glVertex2f(-30,50);
  
      glEnd(); //End quadrilateral coordinates
  
      glBegin(GL_LINE_LOOP); //Begin quadrilateral coordinates
  
      //Trapezoid
      glColor3f(0,0,255);
      glVertex2f(-10,0);
      glVertex2f(50,0);
  
      glVertex2f(100,50);
      glVertex2f(mouse.x - 250,mouse.y - 250);
      glVertex2f(-30,50);
  
      glEnd(); //End quadrilateral coordinates
  
      glPopMatrix();
      glBegin(GL_QUADS); //Begin quadrilateral coordinates
  
      glVertex2f(0,0);
  glColor3f(0,255,0);
      glVertex2f(150,0);
      glVertex2f(150,150);
      glColor3f(255,0,0);
      glVertex2f(0,150);
  
  
      glEnd(); //End quadrilateral coordinates
  </code></pre>