OpenGL 程式設計/基礎/線點

請注意，這適用於非常舊版本的 OpenGL。

繪製點

glBegin(GL_POINTS);
  glVertex2f(0.5f, 0.5f); 
  glVertex2f(0.5f, -0.5f); 
  glVertex2f(-0.5f, 0.5f); 
  glVertex2f(-0.5f, -0.5f); 
glEnd();

繪製線

/* Draws two horizontal lines */
glBegin(GL_LINES);
  glVertex2f(0.5f, 0.5f); 
  glVertex2f(-0.5f, 0.5f); 
  glVertex2f(-0.5f, -0.5f); 
  glVertex2f(0.5f, -0.5f); 
glEnd();

線迴圈

/* Draws a square */
glBegin(GL_LINE_LOOP);
  glVertex2f(0.5f, 0.5f); 
  glVertex2f(-0.5f, 0.5f); 
  glVertex2f(-0.5f, -0.5f); 
  glVertex2f(0.5f, -0.5f); 
glEnd();

連線線

/* Draws a 'C' */
glBegin(GL_LINE_STRIP);
  glVertex2f(0.5f, 0.5f); 
  glVertex2f(-0.5f, 0.5f); 
  glVertex2f(-0.5f, -0.5f); 
  glVertex2f(0.5f, -0.5f); 
glEnd();