p->next=pNET[i]->next;
pNET[i]->next=p;
}
if(polypoint[(j+1+POINTNUM)%POINTNUM].y>polypoint[j].y)
{
NET *p=new NET;
p->x=polypoint[j].x;
p->ymax=polypoint[(j+1+POINTNUM)%POINTNUM].y;
p->dx=(polypoint[(j+1+POINTNUM)%POINTNUM].x-polypoint[j].x)/(polypoint[(j+1+POINTNUM)%POINTNUM].y-polypoint[j].y);
p->next=pNET[i]->next;
pNET[i]->next=p;
}
}
}
/建立并更新活性边表AET/
for(i=0;i<=MaxY;i++)
{
