/* this code is a little old :/ */
void shoot( double ox, double oy, double angle )
{
  int c;
  double cosang, sinang; /* cos and sin of ang */
  double d, dend; /* distance variable and max distance */
  double posx=floor(ox); double posy=floor(oy); /* integer coordinates */
  double fracx=ox-posx; double fracy=oy-posy; /* fraction coordinates */
  int inx = 0, iny = 0;
  double arx, ary;
  double dincx, dincy, dval0, dval1;
 
  /* ray vector */
  cosang = cos(angle * pi / 180);
  sinang = sin(angle * pi / 180);

  d = 1/hz; cosang = cosang*d; sinang = sinang*d; /* ray increments */

  inx = posx; iny = posy;

  arx=0; if(cosang != 0) { arx = 1/fabs(cosang); } /* distance increments */
  ary=0; if(sinang != 0) { ary = 1/fabs(sinang); }

  /* "dval"s are there to prevent infinite loops when ray is parallel to axis */
  dincx = 0; dval0=1e32; dincy = 0; dval1=1e32;

  /* calculate integer coordinate increments */
  if (cosang<0) {dincx=-1; dval0=fracx*arx;} if (cosang>0) {dincx=1; dval0=(1-fracx)*arx;}
  if (sinang<0) {dincy=-1; dval1=fracy*ary;} if (sinang>0) {dincy=1; dval1=(1-fracy)*ary;}

  d=0; dend=5120; /* d = current distance, dend = max distance */

  while( d<dend )
  {
    /* move the ray one square forward */
    if (dval1>dval0) {inx+=dincx; d=dval0; dval0+=arx;}
      else {iny+=dincy; d=dval1; dval1+=ary;}

   if( map[iny][inx] > 0 ) /* ray hit a wall */
   {
     return; /* stop here */
   }
    
  /* I recently created an array that holds sprite indices, thus nullifying the need to perform this loop */
    for( c=0; c<numspri; c++ ) /* check collision with sprites */
    {
     if( sprites[c].dead == 0 && sprites[c].type == 1 )
     {
       if( inx == floor(sprites[c].bx) && iny == floor(sprites[c].by) ) /* ray hit a sprite */
       {
        sprites[c].health -= 10;
        if( sprites[c].health <= 0 )
        {
           sprites[c].active = 4;
          sprites[c].type = 4;
          sprites[c].move = stopped;
         numenemy--;
          beep( 30000, 1 );
        }
        return; /* only hit one sprite at a time */
       }
     }
    }
  }
}