How to measuer lv_coord_tx_ofs, lv_coord_ty_ofs

hai i was make , icon on top
and but i dont know hot to make icon parallel, becasue i dont know lv_coord_tx_ofs, lv_coord_ty_ofs,

//my screen is 

int screenWidth = 240;
int screenHeight = 320;

  lv_obj_t * icon;
    lv_obj_t * cont = lv_cont_create(bg_top, NULL);
    lv_obj_clean_style_list(cont, LV_CONT_PART_MAIN);
    lv_obj_align(cont, NULL, LV_ALIGN_IN_TOP_LEFT, 0, 0);

    icon = lv_img_create(cont, NULL);
    lv_img_set_src(icon, &blank_icon);
    lv_obj_align_origo(icon, NULL, LV_ALIGN_IN_TOP_LEFT, 4, 8);

    icon = lv_img_create(cont, NULL);
    lv_img_set_src(icon, &blank_icon);
      lv_obj_align_origo(icon, NULL, LV_ALIGN_IN_TOP_LEFT, 0, 0);

I just want make icon like this
image