OpenGL里画线

xShandow

<>在OpenGL里画线语句:
glBegin(GL_LINES);
7 E# t& Q' F  ?   glVertex2f(x,y);
   glVertex2f(a,b);
, x& A, ?' ^2 [) F! [0 _$ UglEnd();</P>
! I4 }3 i) i3 D% ?<>注意:目前只讨论OpenGL 2D模式.
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) A3 r( p( b1 a: |, F8 J9 Z; A下面是一个画线实例和效果图
: J0 U, k+ B* e- K* x/ [6 |#define GL_PI 3.1415f</P>
* @0 n: y1 v+ q+ T6 h<>void Draw()
. q0 p8 u$ s) s% X% b  J{
: U+ W, }# y0 s- s9 l GLfloat x,y,angle;</P>
/ N) I- ?+ z& u. _& J+ I8 b<> glPushMatrix();</P>
<> glTranslatef(300,200,0);
glColor3f(0.6f,0.6f,0.1f);
+ k+ L' p' Y, m) G1 y. o5 t. ^, }2 } glBegin(GL_LINES);
) o* z6 @9 R( m; H6 \  for(angle=0.0f;angle&lt;3*GL_PI;angle+=0.5f)
  {
   x=150.0f*sin(angle);
   y=150.0f*cos(angle);</P>
<>   glVertex2f(x,y);</P>
+ U4 R" E" j2 L% v5 X/ f* c9 v; U<>   x=150.0f*sin(angle+3.1415f);
   y=150.0f*cos(angle+3.1415f);
5 ^3 u7 d6 W* M6 x   glVertex2f(x,y);
  }
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glEnd();</P>
<> glPopMatrix();
* S9 B' Z" j) X; o; c}
</P>