display.cpp

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/* display.cpp */

char msg[1024];

void showMsg(int y)
{
  msg[1023] = '\0';
  mvCursor(y, 0);
  putString(msg);
  screenFlush();
}

#define MAXrow 100
#define MAXcol 100
ASOG passive[MAXrow * MAXcol];  // for carrots and dead worms
ASOG screen[MAXrow * MAXcol];   // what gets displayed
int asogRows, asogCols;     // the actual size of 'worm area'
#define asog(ptr, row, col) (ptr + row*asogCols + col)

void sprinkleCarrots()
{
  for(ASOG *p = asog(passive, asogRows, 1); p-- > passive;) {
    p->attr = WA_DIM;
    p->onec = CARROT;
  }
}

void showScreen()
{
  ASOG * sp = screen;
  for (int y = 0; y < asogRows; y++) {
    mvCursor(y, 0);
    for (int x = 0; x < asogCols; x++, sp++)
      putChar(sp->onec | sp->attr);
  }
  screenFlush();
}

/* Show a single worm.  pre: wp != 0.  post: It is drawn on passive[]
   if it is dead.  If alive, it is drawn on screen[].  If eaten, not
   drawn. ; */

void showOneWorm(WORM * wp)
{
  if (wp->status != EATEN) {
    ASOG *f = (wp->status == ALIVE ? screen : passive);
    SEGMENT *bp, *hp = headSeg(wp);
    for (bp = wp->body + 1; bp <= hp; bp++) {
      ASOG *g = asog(f, bp->y, bp->x);
      g->attr = worm_info[wp->type].color;
      g->onec = bp->c;
    }
  }
}

/* Display the carrots, the dead worms, and the current positions of
   one (pre: wp != 0) or all (pre: wp == 0) worms.  globals: passive[]
   read-only.  pre: none; post: ... ; */

void showWormsAndCarrots(WORM * wp)
{
  ASOG *sp = screen, *se = asog(screen, asogRows, 1);
  for (ASOG *pp = passive; sp < se; )
    *sp++ = *pp++;      // copy the carrots + dead worms
  WORM * headWorm = worm + (wp? 1 : hxWorms);
  for (WORM * wp = worm; wp < headWorm; )
    showOneWorm(wp++);
  showScreen();
}