glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor3f( 0.0, 0.0, 0.0 );
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor3f( 0.0, 0.0, 0.0 );
glVertex3i( lineLength, 0.0, 0.0 );
glVertex3i( lineLength - arrowLength, 0.0, -1.0 );
glVertex3i( lineLength, 0.0, 0.0 );
glVertex3i( lineLength - arrowLength, 0.0, -1.0 );