OpenGL里画线

xShandow

<>在OpenGL里画线语句:
glBegin(GL_LINES);
   glVertex2f(x,y);
- \" Q: c5 d) E* H  o" g   glVertex2f(a,b);
9 u, r3 l- _2 F7 q* c9 ]glEnd();</P>
) e$ I+ ]" ^, o9 r3 t# O, C<>注意:目前只讨论OpenGL 2D模式.
) e# j# {. W/ b* E5 ]" k
下面是一个画线实例和效果图
5 s. G# a# I. r6 q. ^  n6 Q#define GL_PI 3.1415f</P>
9 ?' Y) v; R" c( Z! ]8 ~1 S( l+ w3 h6 F. ~<>void Draw()
{
, [$ n  O+ F. ] GLfloat x,y,angle;</P>
<> glPushMatrix();</P>
<> glTranslatef(300,200,0);
glColor3f(0.6f,0.6f,0.1f);
% y$ J) }; \8 L6 {3 J2 B, q# D glBegin(GL_LINES);
  for(angle=0.0f;angle&lt;3*GL_PI;angle+=0.5f)
3 W' K) Z6 [* v  {
   x=150.0f*sin(angle);
! H6 R) N) r2 l, R" g% q   y=150.0f*cos(angle);</P>
<>   glVertex2f(x,y);</P>
<>   x=150.0f*sin(angle+3.1415f);
8 I3 S% I# i" Z1 r: M+ R   y=150.0f*cos(angle+3.1415f);
' g, ]" U$ s% D' s   glVertex2f(x,y);
3 [2 S+ M9 d; G* M5 I6 J/ }4 g) d  }
  
7 h: E1 P6 l1 n9 X8 A# ?& ? glEnd();</P>
<> glPopMatrix();
3 p. i" U8 c" f; p- [0 u}
</P>