OpenGL画线与点并且控制大小

转载自： http://hi.baidu.com/warrially/item/5f60648259b142cdee083d61

//============================================================================== 
// GL画图开头 
//============================================================================== 
     glColor3f(1.0,0.0,0.0); //设置颜色为红 RGB（255,0,0）

     glPointSize( 10 );//设置点的大小为10
     glBegin( GL_POINTS); //画点
         glVertex2i(0,1); //起始点
         glVertex2i(0,-1); //终结点
     glEnd(); 

     glColor3f(0.0,1.0,0.0); //设置颜色为绿色

     glLineWidth( 6 );//设置线的宽度为6
     glBegin( GL_LINES); //画线
         glVertex2i(1,1); //起始线段
         glColor3f(0.0,1.0,1.0); //设置颜色为青绿
         glVertex2i(-1,-1); //终止线段
         glColor3f(1.0,1.0,0.0); //设置颜色为黄
         glVertex2i(1,-1); //起始线段
         glColor3f(1.0,0.0,1.0); //设置颜色为紫红
         glVertex2i(-1,1); //终止线段
     glEnd(); 
//------------------------------------------------------------------------------ 
// GL画图结尾 
//------------------------------------------------------------------------------