text: /*	$NetBSD: nova.c,v 1.4 1997/10/12 21:25:03 christos Exp $	*/
  
  /*
   * Copyright (c) 1980, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <sys/cdefs.h>
  #ifndef lint
  #if 0
  static char sccsid[] = "@(#)nova.c	8.1 (Berkeley) 5/31/93";
  #else
  __RCSID("$NetBSD: nova.c,v 1.4 1997/10/12 21:25:03 christos Exp $");
  #endif
  #endif /* not lint */
  
  #include <stdio.h>
  #include "trek.h"
  
  /*
  **  CAUSE A NOVA TO OCCUR
  **
  **	A nova occurs.  It is the result of having a star hit with
  **	a photon torpedo.  There are several things which may happen.
  **	The star may not be affected.  It may go nova.  It may turn
  **	into a black hole.  Any (yummy) it may go supernova.
  **
  **	Stars that go nova cause stars which surround them to undergo
  **	the same probabilistic process.  Klingons next to them are
  **	destroyed.  And if the starship is next to it, it gets zapped.
  **	If the zap is too much, it gets destroyed.
  */
  
  void
  nova(x, y)
  int	x, y;
  {
  	int	i, j;
  	int	se;
  
  	if (Sect[x][y] != STAR || Quad[Ship.quadx][Ship.quady].stars < 0)
  		return;
  	if (ranf(100) < 15)
  	{
  		printf("Spock: Star at %d,%d failed to nova.\n", x, y);
  		return;
  	}
  	if (ranf(100) < 5) {
  		snova(x, y);
  		return;
  	}
  	printf("Spock: Star at %d,%d gone nova\n", x, y);
  
  	if (ranf(4) != 0)
  		Sect[x][y] = EMPTY;
  	else
  	{
  		Sect[x][y] = HOLE;
  		Quad[Ship.quadx][Ship.quady].holes += 1;
  	}
  	Quad[Ship.quadx][Ship.quady].stars -= 1;
  	Game.kills += 1;
  	for (i = x - 1; i <= x + 1; i++)
  	{
  		if (i < 0 || i >= NSECTS)
  			continue;
  		for (j = y - 1; j <= y + 1; j++)
  		{
  			if (j < 0 || j >= NSECTS)
  				continue;
  			se = Sect[i][j];
  			switch (se)
  			{
  
  			  case EMPTY:
  			  case HOLE:
  				break;
  
  			  case KLINGON:
  				killk(i, j);
  				break;
  
  			  case STAR:
  				nova(i, j);
  				break;
  
  			  case INHABIT:
  				kills(i, j, -1);
  				break;
  
  			  case BASE:
  				killb(i, j);
  				Game.killb += 1;
  				break;
  
  			  case ENTERPRISE:
  			  case QUEENE:
  				se = 2000;
  				if (Ship.shldup)
  					if (Ship.shield >= se)
  					{
  						Ship.shield -= se;
  						se = 0;
  					}
  					else
  					{
  						se -= Ship.shield;
  						Ship.shield = 0;
  					}
  				Ship.energy -= se;
  				if (Ship.energy <= 0)
  					lose(L_SUICID);
  				break;
  
  			  default:
  				printf("Unknown object %c at %d,%d destroyed\n",
  					se, i, j);
  				Sect[i][j] = EMPTY;
  				break;
  			}
  		}
  	}
  	return;
  }
  