OpenGL里画线

xShandow

<>在OpenGL里画线语句:
glBegin(GL_LINES);
3 g4 ^5 c  e3 S4 I  w9 ~6 ^   glVertex2f(x,y);
   glVertex2f(a,b);
( @5 B0 C# R% Q: z( N" TglEnd();</P>
<>注意:目前只讨论OpenGL 2D模式.

下面是一个画线实例和效果图
#define GL_PI 3.1415f</P>
5 k3 N2 h' s! I% n4 |7 j<>void Draw()
{
+ N2 r0 ?5 V& X* `4 ~  P, p GLfloat x,y,angle;</P>
<> glPushMatrix();</P>
9 Y. k  x$ }' U% ^<> 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)
  {
( v/ s$ E) |$ d- M   x=150.0f*sin(angle);
( m" B. T9 b% c1 F& Q   y=150.0f*cos(angle);</P>
<>   glVertex2f(x,y);</P>
<>   x=150.0f*sin(angle+3.1415f);
" F# b7 R/ C4 m( f/ w6 G* `   y=150.0f*cos(angle+3.1415f);
   glVertex2f(x,y);
0 U4 k8 K! ?7 q( M+ K; _+ l  }
, x8 T3 V' x7 N$ G  
9 l5 ?, q5 n" ?8 N9 t; K' X glEnd();</P>
<> glPopMatrix();
: P' I- X" y8 P2 a! N}
* J6 O; K( [7 u6 e* F! r</P>