glClearColor(0, 0, 0, 0.0);
         glClear(GL_COLOR_BUFFER_BIT);
         glColor3f(1.0, 1.0, 1.0);
         glLineWidth(1.4);         ///////////////////////         int sim=xv.size();
        for(int s=1;s200)
          {
         goto ssv1;
          }             ssv:             glColor3f(1.0, 1.0, 1.0);
         glEnable( GL_LINE_STIPPLE );
         glLineStipple( 1 , 0x00AA);
         glBegin(GL_LINES);
         glVertex4f(xv.at(s-1),yv.at(s-1),zv.at(s-1),1);
         glVertex4f(xv.at(s),yv.at(s),zv.at(s),1);             glDisable( GL_LINE_STIPPLE );
         glEnd();
         goto ssvend;            ssv1:             glColor3f(1.0, 0.0, 1.0);             glBegin(GL_LINES);
          glVertex4f(xv.at(s-1),yv.at(s-1),zv.at(s-1),1);
        glVertex4f(xv.at(s),yv.at(s),zv.at(s),1);
         glEnd();
         goto ssvend;                ssvend:
         //////////////////////////////////             }      glFlush(); 
 

引言: 虛線和實線該如何繪制呢 程式執行後全部都變成虛線 但我要需要的是有些地方是實線有些地方是虛線 實在是想不出該如何寫呀 請大大們解答呀...

         ssv:             glColor3f(1.0, 1.0, 1.0);
         glEnable( GL_LINE_STIPPLE );
         glLineStipple( 1 , 0x00AA);
         glBegin(GL_LINES);
         glVertex4f(xv.at(s-1),yv.at(s-1),zv.at(s-1),1);
         glVertex4f(xv.at(s),yv.at(s),zv.at(s),1);             //glDisable( GL_LINE_STIPPLE );
         glEnd();
         glDisable( GL_LINE_STIPPLE ); // 要放在glEnd();之外