draw two point an uniline on lcd of stm32f429

hi all membres i want draw on the lcd of stm32f429Zit two point and after that i want draw a uniline between this two point i try with this code but i got only 1 point can anyone help me ?

void drawtwopoint()
{  TP_STATE* TP_State;

int i=0;
        int xx[2],yy[2] ;
  while (1)
  { TP_State = IOE_TP_GetState();
    if((!TP_State->TouchDetected) && ((TP_State->Y < 245) && (TP_State->Y >= 3)))
    {TP_State = IOE_TP_GetState();
      if((TP_State->X >= 237) || (TP_State->X < 3))
      {}
      else
      {
          while (i!=2)

          {
          xx[i]= TP_State->X;
        yy[i] = TP_State->Y;
        LCD_DrawFullCircle(xx[i] ,yy[i], 6);
                i=i+1;
        }
       LCD_DrawUniLine(xx[0] ,yy[0],xx[1],yy[1]);
         }
          }
    }
}