$BD,0$$FD,15$
GrBitMap *RK_base=GrAlias(grbase2,Fs);


$PI,"<ship_null>",2$


$PI,"<ship_thrust>",3$



$PI,"<ship_null2>",19$


$PI,"<ship_thrust2>",20$


$PI,"<speck>",24$

$PI,"<pebble>",23$


$PI,"<tiny_rock>",21$


$PI,"<tiny_rock2>",22$


$PI,"<small_rock>",4$


$PI,"<small_rock2>",13$



$PI,"<medium_rock>",5$


$PI,"<medium_rock2>",14$




$PI,"<large_rock>",6$


$PI,"<large_rock2>",15$


$PI,"<Bullet>",7$




$PI,"<Cargo>",18$





#define CMD_NULL	0
#define CMD_SPIN_LEFT	1
#define CMD_SPIN_RIGHT	2
#define CMD_THRUST	3
#define CMD_FIRE	4
#define CMD_EXIT	5
I8 cmd=CMD_NULL;

#define NUM_STARS	100
I8 stars_x[NUM_STARS],stars_y[NUM_STARS];

BoolU4 bounce=TRUE;

#define OT_SHIP		1
#define OT_CARGO	2
#define OT_BULLET	3
#define OT_SPECK	4
#define OT_PEBBLE	5
#define OT_TINY_ROCK	6
#define OT_SMALL_ROCK	7
#define OT_MEDIUM_ROCK	8
#define OT_LARGE_ROCK	9

#define A_TRANSITION	-1
#define A_INACTIVE	0
#define A_ACTIVE	1

class Order2D2Theta
{
  double x,y,theta;
  double DxDt,DyDt,DthetaDt;
};

class Object
{
  I4 active;
  I4 type;
  U1 *img;
  double mass,radius;
  U8 timeout;
};

#define NUM_OBJECTS	256

Ode *ode;
Order2D2Theta *o;
Object *objs;

void InitObject(I8 i, I8 type)
{
  objs[i].active=A_ACTIVE;
  objs[i].timeout=0;
  objs[i].type=type;
  switch (type) {
    case OT_SHIP:
      objs[i].img=$IB,"<ship_null>",2$;
      objs[i].radius=15;
      break;
    case OT_CARGO:
      objs[i].img=$IB,"<cargo>",18$;
      objs[i].radius=30;
      break;
    case OT_BULLET:
      objs[i].img=$IB,"<bullet>",9$;
      objs[i].radius=7;
      break;
    case OT_SPECK:
      objs[i].img=$IB,"<speck>",24$;
      objs[i].radius=3;
      break;
    case OT_PEBBLE:
      objs[i].img=$IB,"<pebble>",23$;
      objs[i].radius=5;
      break;
    case OT_TINY_ROCK:
      if (i&1)
	objs[i].img=$IB,"<tiny_rock>",21$;
      else
	objs[i].img=$IB,"<tiny_rock2>",22$;
      objs[i].radius=5;
      break;
    case OT_SMALL_ROCK:
      if (i&1)
	objs[i].img=$IB,"<small_rock>",10$;
      else
	objs[i].img=$IB,"<small_rock2>",13$;
      objs[i].radius=11;
      break;
    case OT_MEDIUM_ROCK:
      if (i&1)
	objs[i].img=$IB,"<medium_rock>",11$;
      else
	objs[i].img=$IB,"<medium_rock2>",14$;
      objs[i].radius=20;
      break;
    case OT_LARGE_ROCK:
      if (i&1)
	objs[i].img=$IB,"<large_rock>",12$;
      else
	objs[i].img=$IB,"<large_rock2>",15$;
      objs[i].radius=26;
      break;
  }
  objs[i].mass=objs[i].radius*objs[i].radius*objs[i].radius;
}

I8 AllocObject(I8 type)
{
  I8 i;
  for (i=0;i<NUM_OBJECTS-1;i++)
    if (objs[i].active==A_INACTIVE)
      break;
  InitObject(i,type);
  return i;
}


void DrawIt(TssStruct *tss)
{
  I8 i,*r1,x,y;
  ClearWinText(tss);
  LtfUpdateAuxLtf(tss);

  RK_base->color=WHITE;
  for (i=0;i<NUM_STARS;i++)
    GrPlot(RK_base,stars_x[i],stars_y[i]);

  for (i=0;i<NUM_OBJECTS;i++) {
    if (objs[i].active==A_ACTIVE) {
      if (objs[i].timeout && objs[i].timeout<GetTimeStamp)
	objs[i].active=A_INACTIVE;
      else {
	x=o[i].x;
	y=o[i].y;

	if (x<0) {
	  x=GR_WIDTH-AbsI8(x)%GR_WIDTH;
	  o[i].x=x;
	} else if (x>GR_WIDTH) {
	  x=x%GR_WIDTH;
	  o[i].x=x;
	}
	if (y<0) {
	  y=GR_HEIGHT-AbsI8(y)%GR_HEIGHT;
	  o[i].y=y;
	} else if (y>GR_HEIGHT) {
	  y=y%GR_HEIGHT;
	  o[i].y=y;
	}
	switch (objs[i].type) {
	  case OT_SHIP:
	    RK_base->flags|=BMF_TRANSFORMATION;
	    r1=RK_base->r;
	    RK_base->r=GrTheta(o[i].theta);
	    RK_base->x=x;
	    RK_base->y=y;
	    RK_base->z=0;
	    if (cmd==CMD_THRUST && GetTimeStamp&8192)
	      GrElemsPlot(RK_base,0,0,0,$IB,"<ship_thrust>",3$);
	    else
	      GrElemsPlot(RK_base,0,0,0,$IB,"<ship_null>",2$);
	    Free(RK_base->r);
	    RK_base->r=r1;
	    RK_base->flags&=~BMF_TRANSFORMATION;
	    break;
	  case OT_BULLET:
	  case OT_SPECK:
	  case OT_PEBBLE:
	  case OT_TINY_ROCK:
	  case OT_SMALL_ROCK:
	  case OT_MEDIUM_ROCK:
	  case OT_LARGE_ROCK:
	  case OT_CARGO:
	    RK_base->flags|=BMF_TRANSFORMATION;
	    r1=RK_base->r;
	    RK_base->r=GrTheta(o[i].theta);
	    RK_base->x=x;
	    RK_base->y=y;
	    RK_base->z=0;
	    GrElemsPlot(RK_base,0,0,0,objs[i].img);
	    Free(RK_base->r);
	    RK_base->r=r1;
	    RK_base->flags&=~BMF_TRANSFORMATION;
	    break;
	}
      }
    }
  }
}

void SongEndTsk()
{
  Sound(0);
  Exit;
}

void SongTsk()
{
  Fs->end_task_cb=&SongEndTsk;
  ResetMusicSettings;
  while (TRUE) {
    Play("qDCDeEGBDetBBFqDeDB");
    Play("FAetAFDeDFqAetDFBeDFetFDEqD");
    Play("eFAetAFDeDFqAetDFBeDFetFDEqD");
  }
}

void InitObjs()
{
  I8 i,j;

  for (i=0;i<NUM_STARS;i++) {
    stars_x[i]=RandU2%GR_WIDTH;
    stars_y[i]=RandU2%GR_HEIGHT;
  }

  MemSet(objs,0,sizeof(Object)*NUM_OBJECTS);
  MemSet(o,0,sizeof(Order2D2Theta)*NUM_OBJECTS);

  i=AllocObject(OT_SHIP); //always #0
  objs[i].mass=2.0*objs[i].radius*objs[i].radius*objs[i].radius;
  o[i].x=GR_WIDTH/2;
  o[i].y=GR_HEIGHT/2;

  i=AllocObject(OT_CARGO); //always #1
  objs[i].mass=0.5*objs[i].radius*objs[i].radius*objs[i].radius;
  o[i].x=0;
  o[i].DxDt=16.0;
  o[i].y=GR_HEIGHT/2;
  o[i].theta=pi/2;

  for (j=0;j<4;j++) {
    i=AllocObject(OT_LARGE_ROCK);
    o[i].x=RandU4%GR_WIDTH;
    o[i].y=RandU4%GR_HEIGHT;
    o[i].DxDt=(32768-RandU2)/2000.0;
    o[i].DyDt=(32768-RandU2)/2000.0;
    o[i].DthetaDt=(32768-RandU2)/25000.0;
    o[i].theta=pi2*(32768-RandU2)/16384.0;
  }
}

void MyDerivative(Ode *ode,double t,Order2D2Theta *state,Order2D2Theta *DstateDt)
{
  I8 i,j;
  double f,d,d1,dd,dx,dy;
  nounusedwarn ode,t;

  MemSet(DstateDt,0,sizeof(Order2D2Theta)*NUM_OBJECTS);
  for (i=0;i<NUM_OBJECTS;i++) {
    if (objs[i].active==A_ACTIVE) {
      DstateDt[i].x=state[i].DxDt;
      DstateDt[i].y=state[i].DyDt;
      DstateDt[i].theta=state[i].DthetaDt;
      for (j=0;j<NUM_OBJECTS;j++) {
	if (i!=j && objs[j].active==A_ACTIVE) {
	  dx=state[i].x-state[j].x;
	  dy=state[i].y-state[j].y;
	  dd=Sqr(dx)+Sqr(dy);
	  d=Sqrt(dd);

	  if (d) {
	    dx/=d;
	    dy/=d;
	  } else {
	    dx=0;
	    dy=0;
	  }

	  d1=objs[i].radius+objs[j].radius;
	  f=0;
	  if (dd<Sqr(d1)) {
	    if (bounce && objs[i].type!=OT_CARGO && objs[j].type!=OT_CARGO) {
	      f=Sqr(Sqr(Sqr(d1-Abs(d)+0.1))); //spring force
	      if (f>1000000.0) f=1000000.0;
	    }
	  } else
	    f=-2.5*objs[i].mass*objs[j].mass/(dd+1.0);

	  DstateDt[i].DxDt+=f*dx/objs[i].mass;
	  DstateDt[i].DyDt+=f*dy/objs[i].mass;
	}
      }
    }
  }
  switch (cmd) {
    case CMD_SPIN_LEFT:
      DstateDt[0].DthetaDt-=10.0;
      break;
    case CMD_SPIN_RIGHT:
      DstateDt[0].DthetaDt+=10.0;
      break;
    case CMD_THRUST:
      DstateDt[0].DxDt+=100.0*Cos(state[0].theta-pi/2.0);
      DstateDt[0].DyDt+=100.0*Sin(state[0].theta-pi/2.0);
      break;
  }

  DstateDt[1].DxDt+=2.0*Cos(state[1].theta-pi/2.0);
  DstateDt[1].DyDt+=2.0*Sin(state[1].theta-pi/2.0);
}

void Collision(I8 i,I8 j)
{
  I8 i2;
  switch (objs[i].type) {
    case OT_SHIP:
      if (!bounce) {
	cmd=CMD_EXIT;
	objs[i].active=A_INACTIVE;
      }
      break;
    case OT_CARGO:
      cmd=CMD_EXIT;
      objs[i].active=A_INACTIVE;
      break;
    case OT_SPECK:
      if (objs[j].type==OT_BULLET && !bounce)
	objs[i].active=A_INACTIVE;
      break;
    case OT_BULLET:
      if (!bounce)
	objs[i].active=A_INACTIVE;
      break;
    case OT_PEBBLE:
    case OT_TINY_ROCK:
    case OT_SMALL_ROCK:
    case OT_MEDIUM_ROCK:
      i2=AllocObject(objs[i].type-1);
      objs[i2].active=A_TRANSITION;
      o[i2].x=o[i].x+objs[i2].radius+2.0;
      o[i2].y=o[i].y;
      o[i2].theta=o[i].theta;
      o[i2].DxDt=o[i].DxDt;
      o[i2].DyDt=o[i].DyDt;
      o[i2].DthetaDt=o[i].DthetaDt;

      i2=AllocObject(objs[i].type-1);
      objs[i2].active=A_TRANSITION;
      o[i2].x=o[i].x-objs[i2].radius-2.0;
      o[i2].y=o[i].y;
      o[i2].theta=o[i].theta;
      o[i2].DxDt=o[i].DxDt;
      o[i2].DyDt=o[i].DyDt;
      o[i2].DthetaDt=o[i].DthetaDt;

      objs[i].active=A_INACTIVE;
      break;
    case OT_LARGE_ROCK:
      i2=AllocObject(objs[i].type-1);
      objs[i2].active=A_TRANSITION;
      o[i2].x=o[i].x+objs[i2].radius+4.0;
      o[i2].y=o[i].y+objs[i2].radius+4.0;
      o[i2].theta=o[i].theta;
      o[i2].DxDt=o[i].DxDt;
      o[i2].DyDt=o[i].DyDt;
      o[i2].DthetaDt=o[i].DthetaDt;

      i2=AllocObject(objs[i].type-1);
      objs[i2].active=A_TRANSITION;
      o[i2].x=o[i].x-objs[i2].radius-4.0;
      o[i2].y=o[i].y-objs[i2].radius-4.0;
      o[i2].theta=o[i].theta;
      o[i2].DxDt=o[i].DxDt;
      o[i2].DyDt=o[i].DyDt;
      o[i2].DthetaDt=o[i].DthetaDt;

      i2=AllocObject(objs[i].type-1);
      objs[i2].active=A_TRANSITION;
      o[i2].x=o[i].x-objs[i2].radius-4.0;
      o[i2].y=o[i].y+objs[i2].radius+4.0;
      o[i2].theta=o[i].theta;
      o[i2].DxDt=o[i].DxDt;
      o[i2].DyDt=o[i].DyDt;
      o[i2].DthetaDt=o[i].DthetaDt;

      i2=AllocObject(objs[i].type-1);
      objs[i2].active=A_TRANSITION;
      o[i2].x=o[i].x+objs[i2].radius+4.0;
      o[i2].y=o[i].y-objs[i2].radius-4.0;
      o[i2].theta=o[i].theta;
      o[i2].DxDt=o[i].DxDt;
      o[i2].DyDt=o[i].DyDt;
      o[i2].DthetaDt=o[i].DthetaDt;

      objs[i].active=A_INACTIVE;
      break;
  }

  switch (objs[j].type) {
    case OT_SHIP:
      if (!bounce) {
	cmd=CMD_EXIT;
	objs[j].active=A_INACTIVE;
      }
      break;
    case OT_CARGO:
      cmd=CMD_EXIT;
      objs[j].active=A_INACTIVE;
      break;
    case OT_SPECK:
      if (objs[i].type==OT_BULLET && !bounce)
	objs[j].active=A_INACTIVE;
      break;
    case OT_BULLET:
      if (!bounce)
	objs[j].active=A_INACTIVE;
      break;
    case OT_PEBBLE:
    case OT_TINY_ROCK:
    case OT_SMALL_ROCK:
    case OT_MEDIUM_ROCK:
      i2=AllocObject(objs[j].type-1);
      objs[i2].active=A_TRANSITION;
      o[i2].x=o[j].x+objs[i2].radius+2.0;
      o[i2].y=o[j].y;
      o[i2].theta=o[j].theta;
      o[i2].DxDt=o[j].DxDt;
      o[i2].DyDt=o[j].DyDt;
      o[i2].DthetaDt=o[j].DthetaDt;

      i2=AllocObject(objs[j].type-1);
      objs[i2].active=A_TRANSITION;
      o[i2].x=o[j].x-objs[i2].radius-2.0;
      o[i2].y=o[j].y;
      o[i2].theta=o[j].theta;
      o[i2].DxDt=o[j].DxDt;
      o[i2].DyDt=o[j].DyDt;
      o[i2].DthetaDt=o[j].DthetaDt;

      objs[j].active=A_INACTIVE;
      break;

    case OT_LARGE_ROCK:
      i2=AllocObject(objs[j].type-1);
      objs[i2].active=A_TRANSITION;
      o[i2].x=o[j].x+objs[i2].radius+4.0;
      o[i2].y=o[j].y+objs[i2].radius+4.0;
      o[i2].theta=o[j].theta;
      o[i2].DxDt=o[j].DxDt;
      o[i2].DyDt=o[j].DyDt;
      o[i2].DthetaDt=o[j].DthetaDt;

      i2=AllocObject(objs[j].type-1);
      objs[i2].active=A_TRANSITION;
      o[i2].x=o[j].x-objs[i2].radius-4.0;
      o[i2].y=o[j].y-objs[i2].radius-4.0;
      o[i2].theta=o[j].theta;
      o[i2].DxDt=o[j].DxDt;
      o[i2].DyDt=o[j].DyDt;
      o[i2].DthetaDt=o[j].DthetaDt;

      i2=AllocObject(objs[j].type-1);
      objs[i2].active=A_TRANSITION;
      o[i2].x=o[j].x-objs[i2].radius-4.0;
      o[i2].y=o[j].y+objs[i2].radius+4.0;
      o[i2].theta=o[j].theta;
      o[i2].DxDt=o[j].DxDt;
      o[i2].DyDt=o[j].DyDt;
      o[i2].DthetaDt=o[j].DthetaDt;

      i2=AllocObject(objs[j].type-1);
      objs[i2].active=A_TRANSITION;
      o[i2].x=o[j].x+objs[i2].radius+4.0;
      o[i2].y=o[j].y-objs[i2].radius-4.0;
      o[i2].theta=o[j].theta;
      o[i2].DxDt=o[j].DxDt;
      o[i2].DyDt=o[j].DyDt;
      o[i2].DthetaDt=o[j].DthetaDt;

      objs[j].active=A_INACTIVE;
      break;
  }
}

void CheckCollisions()
{
  I8 i,j,*r1;
  double d,d1,dd,dx,dy;
  GrBitMap *b;
  for (i=0;i<NUM_OBJECTS;i++) {
    if (objs[i].active==A_ACTIVE) {
      for (j=i+1;j<NUM_OBJECTS;j++) {
	if (objs[j].active==A_ACTIVE) {
	  dx=o[i].x-o[j].x;
	  dy=o[i].y-o[j].y;
	  dd=Sqr(dx)+Sqr(dy);
	  d=Sqrt(dd);

	  if (d) {
	    dx/=d;
	    dy/=d;
	  } else {
	    dx=0;
	    dy=0;
	  }

	  d1=objs[i].radius+objs[j].radius;
	  if (dd<Sqr(d1)) {
	    b=GrBitMapNew(BMT_COLOR4,64,64,Fs);
	    b->flags|=BMF_TRANSFORMATION;

	    r1=b->r;
	    b->r=GrTheta(o[i].theta);
	    b->x=32;
	    b->y=32;
	    b->z=0;
	    GrElemsPlot(b,0,0,0,objs[i].img);
	    Free(b->r);
	    b->r=r1;

	    b->bkcolor=ROP_COLLISION+BLACK;

	    r1=b->r;
	    b->r=GrTheta(o[j].theta);
	    b->x=o[j].x-o[i].x+32;
	    b->y=o[j].y-o[i].y+32;
	    b->z=0;
	    GrElemsPlot(b,0,0,0,objs[j].img);
	    Free(b->r);
	    b->r=r1;

	    if (b->collision_cnt>0)
	      Collision(i,j);

	    GrDel(b);
	  }
	}
      }
    }
  }
  for (i=0;i<NUM_OBJECTS;i++)
    if (objs[i].active==A_TRANSITION)
      objs[i].active=A_ACTIVE;
}

#define MUZZLE_VELOCITY 500.0

void Fire()
{
  double t=o[0].theta;
  I8 i=AllocObject(OT_BULLET);
  objs[i].timeout=GetTimeStamp+time_stamp_freq/2;
  objs[i].mass*=10.0;
  o[i].x=o[0].x+(objs[0].radius+objs[i].radius+1.0)*Cos(t-pi/2.0);
  o[i].y=o[0].y+(objs[0].radius+objs[i].radius+1.0)*Sin(t-pi/2.0);
  o[i].DxDt=o[0].DxDt+MUZZLE_VELOCITY*Cos(t-pi/2.0);
  o[i].DyDt=o[0].DyDt+MUZZLE_VELOCITY*Sin(t-pi/2.0);
  o[i].DthetaDt=(32768-RandU2)/3000.0;

//not real physics with the 0.005 factor
  o[0].DxDt-=0.005*MUZZLE_VELOCITY*Cos(t-pi/2.0)*objs[i].mass/objs[0].mass;
  o[0].DyDt-=0.005*MUZZLE_VELOCITY*Sin(t-pi/2.0)*objs[i].mass/objs[0].mass;
}

void CheckCrazy()
{
  I8 i;
  double d;
  for (i=0;i<NUM_OBJECTS;i++)
    if (objs[i].active==A_ACTIVE) {
      d=Sqrt(Sqr(o[i].DxDt)+Sqr(o[i].DyDt));
      if (d>MUZZLE_VELOCITY*5.0)
	Auto(" ");
    }
}

void Rocks()
{
  I8 ch=0,i=0,c,p1,p2,sc=0;
  void *old_update=Fs->update_win;
  Ltf *l,*old_cur_ltf=Fs->cur_ltf,*old_aux_ltf=Fs->aux_ltf;
  BoolU4 old_preempt=Preempt(OFF),
	 old_border=WinBorder(OFF);
  TssStruct *song_tss=Spawn(&SongTsk,"Rocks Song",Fs);
  I8 old_attr=Fs->text_attribute;

  SetTypeMatic(0);

  ode=OdeNew(NUM_OBJECTS*6);
  ode->derivative=&MyDerivative;
  ode->tolerance_start=.1;
  o=ode->state;
  objs=MAlloc(NUM_OBJECTS*sizeof(Object));

  Fs->text_attribute=0x0F;
  WinMax;

  Fs->cur_ltf=NULL;

  Fs->aux_ltf=l=InitSysAuxLtf(TRUE);
  LtfPutSExt(l,"$$MA+A+TML+IV,\"Restart | \",\" \"$$");
  LtfPutSExt(l,"$$MA+A+TML+IV,\"Bounce | \",\"b\"$$");
  LtfPutSExt(l,"$$MA+A+TML+IV,\"Exit\",\"\\033\"$$");
  LtfPutSExt(l,"$$CM+LX+TY,2,2$$$$TX+BK,\"Escort the cargo ship\"$$");

  InitObjs;
  InsQue(ode,Fs->last_ode);
  Fs->update_win=&DrawIt;

  while (ch!=CH_ESC && ch!=CH_CTRLQ) {
    InitObjs;
    ch=0;
    cmd=CMD_NULL;
    while (ch!=CH_ESC && ch!=CH_CR && ch!=CH_SPACE && ch!=CH_CTRLQ) {
      while (c=ScanMsg(&p1,&p2,1<<MSG_KEY_DOWN|1<<MSG_KEY_UP)) {
	ch=p1; sc=p2;
	if (c==MSG_KEY_DOWN) {
	  if (ch==CH_SPACE) {
	    if (!l->best_d && l->cur_entry!=l) {
	      LtfRunEntry(l,l->cur_entry,TRUE,old_preempt);
	      ch=0;
	      l->best_d=MAX_I8;
	    }
	  } else if (ch=='b')
	    bounce=!bounce;
	  else if (sc.u1[0]==SC_CURSOR_RIGHT)
	    cmd=CMD_SPIN_RIGHT;
	  else if (sc.u1[0]==SC_CURSOR_LEFT)
	    cmd=CMD_SPIN_LEFT;
	  else if (sc.u1[0]==SC_CURSOR_UP)
	    cmd=CMD_THRUST;
	  else if (sc.u1[0]==SC_CURSOR_DOWN)
	    Fire;
	} else
	  cmd=CMD_NULL;
      }
      CheckCollisions;
      CheckCrazy;
      if (cmd==CMD_EXIT) {
	Sleep(1000);
	ch=CH_SPACE;
      }
      WinSync; //messages are only queued by winmngr
    }
  }
  Kill(song_tss);
  Sound(0);
  LtfDel(l);
  Fs->aux_ltf=old_aux_ltf;
  if (Fs->cur_ltf=old_cur_ltf)
    LtfBottom(Fs->cur_ltf);

  RemQue(ode);
  OdeDel(ode);
  Free(objs);
 
  Fs->text_attribute=old_attr;
  Fs->update_win=old_update;
  WinBorder(old_border);
  Preempt(old_preempt);
}

љџџџќџџџќџџџ
њџџџџџџџўџџџўџџџ

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јџџџ

јџџџ

			

	
	
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ѓџџџ
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