OpenGL里画线

xShandow

<>在OpenGL里画线语句:
8 p3 p* V/ C- w5 y2 |. jglBegin(GL_LINES);
, J: p" f+ T* d- }" r+ _% l   glVertex2f(x,y);
$ L& B3 ^# I% I% g# n' {6 E* j   glVertex2f(a,b);
glEnd();</P>
<>注意:目前只讨论OpenGL 2D模式.

! v# e9 R/ e8 V: L下面是一个画线实例和效果图
( G, o) ^/ y2 j4 h# T$ f#define GL_PI 3.1415f</P>
<>void Draw()
8 R+ O6 d0 j* s/ Y{
, d# P: J# y7 l+ K! B( d GLfloat x,y,angle;</P>
<> glPushMatrix();</P>
" M. D4 [4 _- Y+ b<> glTranslatef(300,200,0);
- {; v8 ^6 n' O& b$ N glColor3f(0.6f,0.6f,0.1f);
glBegin(GL_LINES);
  for(angle=0.0f;angle&lt;3*GL_PI;angle+=0.5f)
  {
5 u+ X' y8 A# z5 c) O   x=150.0f*sin(angle);
: i6 `0 g4 t( z. ^9 }  F( w8 c   y=150.0f*cos(angle);</P>
<>   glVertex2f(x,y);</P>
<>   x=150.0f*sin(angle+3.1415f);
3 |+ Z8 O6 X2 a9 }# F- Q6 n, g   y=150.0f*cos(angle+3.1415f);
) n  D. X4 I0 `" }- L. V) e+ x   glVertex2f(x,y);
- t: A. z6 S6 u  }
  
glEnd();</P>
* F. c( s5 [: a) p8 [7 B5 K<> glPopMatrix();
}
</P>