OpenGL里画线

xShandow

<>在OpenGL里画线语句:
glBegin(GL_LINES);
   glVertex2f(x,y);
   glVertex2f(a,b);
' S9 |8 R9 e& QglEnd();</P>
+ ^  w8 Y& O/ y<>注意:目前只讨论OpenGL 2D模式.
, D( n) ^* i* k0 C+ w
+ e$ f. P" u6 a; @! L9 D下面是一个画线实例和效果图
#define GL_PI 3.1415f</P>
<>void Draw()
% A( o: j3 |2 C{
GLfloat x,y,angle;</P>
( h+ T4 r/ e" I5 ~/ J5 X<> glPushMatrix();</P>
* Z1 }3 |8 W2 I6 F8 k# `<> glTranslatef(300,200,0);
glColor3f(0.6f,0.6f,0.1f);
glBegin(GL_LINES);
  for(angle=0.0f;angle&lt;3*GL_PI;angle+=0.5f)
1 R  [% Q/ z5 T8 q7 H! g  {
6 r9 y+ y' F0 p9 j% t   x=150.0f*sin(angle);
   y=150.0f*cos(angle);</P>
( M5 |& `+ B+ J; h% l<>   glVertex2f(x,y);</P>
* V& H. i9 d4 {# @$ h! i2 |<>   x=150.0f*sin(angle+3.1415f);
! Z7 O2 G2 g8 o, d   y=150.0f*cos(angle+3.1415f);
1 k% g5 ?8 C; |. M6 k% C  F   glVertex2f(x,y);
  }
9 `8 `/ w$ i2 E% ^! e7 |  
glEnd();</P>
4 h: M- \% K0 @1 P) P<> glPopMatrix();
+ \: V9 H* R" s, k+ B7 j}
9 `4 O( F% ?# a4 r# V6 f/ y$ y, F2 h</P>