OpenGL里画线

xShandow

<>在OpenGL里画线语句:
glBegin(GL_LINES);
% b# q; N$ j6 Q9 e' R# A   glVertex2f(x,y);
# n6 k7 Y4 y  b+ f' V   glVertex2f(a,b);
glEnd();</P>
<>注意:目前只讨论OpenGL 2D模式.

; n6 L" K% e5 d下面是一个画线实例和效果图
& M, z* O3 Z6 t9 x#define GL_PI 3.1415f</P>
<>void Draw()
{
9 E: U" t- ^6 {0 l6 J& ~5 |4 l GLfloat x,y,angle;</P>
<> glPushMatrix();</P>
<> glTranslatef(300,200,0);
# ]6 r/ h8 P4 s! D1 t% h; c: | glColor3f(0.6f,0.6f,0.1f);
6 N. |8 F; P- V$ Q8 O4 ?8 w glBegin(GL_LINES);
  for(angle=0.0f;angle&lt;3*GL_PI;angle+=0.5f)
0 \5 v$ t& m5 P" e. @8 ^  {
   x=150.0f*sin(angle);
* F4 W" g& X  A9 v4 B$ b* C' M   y=150.0f*cos(angle);</P>
<>   glVertex2f(x,y);</P>
<>   x=150.0f*sin(angle+3.1415f);
   y=150.0f*cos(angle+3.1415f);
   glVertex2f(x,y);
2 C$ G% W; o0 p' ~- y6 c% c  }
9 F5 ~6 |8 p3 W! y6 A+ [6 r0 n+ h  
, B/ J+ v# a+ Q/ f# O glEnd();</P>
; _* l! I2 `& U. I1 y6 O<> glPopMatrix();
/ E1 x. K' u4 n9 v4 r8 q: G  _}
</P>