OpenGL里画线

xShandow

<>在OpenGL里画线语句:
glBegin(GL_LINES);
( \+ I8 j+ R" V( }9 u$ ^! p2 q   glVertex2f(x,y);
   glVertex2f(a,b);
! ?% V3 Z) w8 l/ a$ B9 f" A9 U) KglEnd();</P>
<>注意:目前只讨论OpenGL 2D模式.

0 ?6 ]6 F0 D( D7 k' U- y4 K8 O: A8 G) w下面是一个画线实例和效果图
#define GL_PI 3.1415f</P>
<>void Draw()
9 q# D+ n+ o( F{
GLfloat x,y,angle;</P>
<> glPushMatrix();</P>
<> glTranslatef(300,200,0);
3 W2 i3 g1 }: J! Z7 _8 R8 P) Y glColor3f(0.6f,0.6f,0.1f);
; @3 b  Q! d3 E" n& {* \* W6 c4 F glBegin(GL_LINES);
  for(angle=0.0f;angle&lt;3*GL_PI;angle+=0.5f)
4 A/ q4 i" _) s2 E. N0 Y  {
   x=150.0f*sin(angle);
$ `) ?* D! r( i+ W5 s. `   y=150.0f*cos(angle);</P>
( z+ K. w) z; C" F4 J: L/ O9 q<>   glVertex2f(x,y);</P>
<>   x=150.0f*sin(angle+3.1415f);
3 W5 z" A& W: k; i7 e6 L+ ~   y=150.0f*cos(angle+3.1415f);
* n+ W/ ~% t; N  F5 B0 F# T, T   glVertex2f(x,y);
& w- Q, i+ N; m: n7 z, L* I! p  }
( p9 s# I1 h  o  p  
# T# q( ^, A, w1 B8 ^ glEnd();</P>
6 r( W4 ^1 ~6 z# E$ U# z<> glPopMatrix();
}
</P>