OpenGL里画线

xShandow

<>在OpenGL里画线语句:
glBegin(GL_LINES);
: l& T- I  ?9 C' [$ L9 S& j8 L   glVertex2f(x,y);
   glVertex2f(a,b);
glEnd();</P>
<>注意:目前只讨论OpenGL 2D模式.
2 T7 I+ A. p. S6 A
- b) A8 A+ K" E" B3 A! O. Q下面是一个画线实例和效果图
#define GL_PI 3.1415f</P>
<>void Draw()
* Y# d- {; z" `3 I: v! P5 M{
GLfloat x,y,angle;</P>
+ L$ [' d0 r& M0 d/ F+ @  h<> glPushMatrix();</P>
<> glTranslatef(300,200,0);
! A5 r7 L1 C: E5 L; z! E glColor3f(0.6f,0.6f,0.1f);
+ @* r& C4 N( g9 k. K+ h glBegin(GL_LINES);
: p2 _2 n0 S, c, x, d  for(angle=0.0f;angle&lt;3*GL_PI;angle+=0.5f)
7 }1 I% m4 h3 z1 X# F  {
   x=150.0f*sin(angle);
   y=150.0f*cos(angle);</P>
* s5 r; J! ^$ ~$ S2 ]" b<>   glVertex2f(x,y);</P>
% b+ z  d* S8 G4 m<>   x=150.0f*sin(angle+3.1415f);
   y=150.0f*cos(angle+3.1415f);
   glVertex2f(x,y);
  r, r* f& e3 A) g+ _  }
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glEnd();</P>
<> glPopMatrix();
}
* F; h# z) F$ P. E! N; l</P>