source/enemy/nworm.cpp

@@ -28,9 +28,88 @@ void CNpcEnemy::processParasiticWormMovement( int _frames )
 	s32 moveX = 0, moveY = 0;
 	s32 moveVel = 0;
 	s32 moveDist = 0;
+	DVECTOR oldPos = Pos;
+	u8 skipCounter;
 
 	processGenericFixedPathMove( _frames, &moveX, &moveY, &moveVel, &moveDist );
 
 	Pos.vx += moveX;
 	Pos.vy += moveY;
+
+	m_extension += 256;
+	m_extension &= 4095;
+
+	// add new (old) position onto list head
+	CNpcPositionHistory *newPos;
+	newPos = new ("position history") CNpcPositionHistory;
+	newPos->pos = oldPos;
+	newPos->next = m_positionHistory;
+	m_positionHistory = newPos;
+
+	// remove list end
+	CNpcPositionHistory *last;
+	last = newPos;
+
+	while( newPos->next )
+	{
+		last = newPos;
+		newPos = newPos->next;
+	}
+
+	delete newPos;
+	last->next = NULL;
+
+	// assign positions
+	newPos = m_positionHistory;
+	for ( skipCounter = 1 ; skipCounter < NPC_PARASITIC_WORM_SPACING ; skipCounter++ )
+	{
+		newPos = newPos->next;
+	}
+
+	CThing	*List=Next;
+
+	oldPos = Pos;
+
+	s32 extension = m_extension;
+	u8 downShift = 2;
+
+	while( List )
+	{
+		CNpcEnemy *segment = (CNpcEnemy *) List;
+
+		s32 xDist = oldPos.vx - newPos->pos.vx;
+		s32 yDist = oldPos.vy - newPos->pos.vy;
+
+		s16 headingToTarget = ratan2( yDist, xDist );
+
+		segment->setHeading( headingToTarget );
+
+		DVECTOR sinPos;
+
+		sinPos = newPos->pos;
+		s32 diff = ( ( 10 >> downShift ) * rsin( extension ) ) >> 12;
+		sinPos.vx += ( diff * rcos( headingToTarget + 1024 ) ) >> 12;
+		sinPos.vy += ( diff * rsin( headingToTarget + 1024 ) ) >> 12;
+
+		List->setPos( sinPos );
+		oldPos = newPos->pos;
+
+		List = List->getNext();
+
+		if ( List )
+		{
+			for ( skipCounter = 0 ; skipCounter < NPC_PARASITIC_WORM_SPACING ; skipCounter++ )
+			{
+				newPos = newPos->next;
+			}
+		}
+
+		extension += 1024;
+		extension &= 4095;
+
+		if ( downShift > 0 )
+		{
+			downShift--;
+		}
+	}
 }