... VAÊN TOÁT NGHIEÄP 30 void LIST::Show(){ setfillstyle(SOLID_FILL,Color); bar(l,t,r,b); int hor=(r-l) /3, ver=(b-t) /3; int x1=l+hor,x2=r-hor,x3=l+(r-l)/2,y1=t+ver,y2=t+ver,y3=b-ver; setcolor(WHITE); ... x1=l+hor,x2=r-hor,x3=l+(r-l)/2,y1=t+ver,y2=t+ver,y3=b-ver; setcolor(WHITE); line(x1,y1,x2,y2); line(x2,y2,x3,y3); line(x1,y1,x3,y3); setfillstyle(SOLID_FILL,WHITE); floodfill(x1+(x2-x1)/2,y1+(y3-y2)/2,WHITE); setfillstyle(SOLID_FILL,Color); ... Cancel//tra ve 1:nhan OK{ TEXTBOX Box2; HideMouse(); int hor=(r-l) /3, ver=(b-t) /3; int x1=l+hor,x2=r-hor,x3=l+(r-l)/2,y1=t+ver,y2=t+ver,y3=b-ver;...