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game/client/tf/c_entity_bird.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Dove entity for the Meet the Medic tease.
+//
+//=============================================================================//
+
+#include "cbase.h"
+#include "tf_gamerules.h"
+#include "c_baseanimating.h"
+
+#define ENTITY_FLYING_BIRD_MODEL	"models/props_forest/dove.mdl"
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+class C_EntityFlyingBird : public CBaseAnimating
+{
+	DECLARE_CLASS( C_EntityFlyingBird, CBaseAnimating );
+public:
+	void			InitFromServerData( float flyAngle, float flyAngleRate, float flAccelZ, float flSpeed, float flGlideTime );
+	virtual void	Touch( CBaseEntity *pOther ); 
+
+private:
+	virtual void	ClientThink( void );
+	void			UpdateFlyDirection( void );
+
+private:
+	Vector m_flyForward;
+	float m_flyAngle;
+	float m_flyAngleRate;
+	float m_flyZ;
+	float m_accelZ;
+	float m_speed;
+	float m_timestamp;
+
+	CountdownTimer m_lifetimeTimer;
+	CountdownTimer m_glideTimer;
+};
+
+//-----------------------------------------------------------------------------
+// Purpose: Server message that tells us to create a dove
+//-----------------------------------------------------------------------------
+void __MsgFunc_SpawnFlyingBird( bf_read &msg )
+{
+	Vector vecPos;
+	msg.ReadBitVec3Coord( vecPos );
+	float flyAngle = msg.ReadFloat();
+	float flyAngleRate = msg.ReadFloat();
+	float flAccelZ = msg.ReadFloat();
+	float flSpeed = msg.ReadFloat();
+	float flGlideTime = msg.ReadFloat();
+
+	C_EntityFlyingBird *pBird = new C_EntityFlyingBird();
+	if ( !pBird )
+		return;
+
+	pBird->SetAbsOrigin( vecPos );
+	pBird->InitFromServerData( flyAngle, flyAngleRate, flAccelZ, flSpeed, flGlideTime );
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+void C_EntityFlyingBird::UpdateFlyDirection( void )
+{
+	Vector forward;
+
+	forward.x = cos( m_flyAngle );
+	forward.y = sin( m_flyAngle );
+	forward.z = m_flyZ;
+	forward.NormalizeInPlace();
+
+	SetAbsVelocity( forward * m_speed );
+
+	QAngle angles;
+	VectorAngles( forward, angles );
+
+	SetAbsAngles( angles );
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+void C_EntityFlyingBird::InitFromServerData( float flyAngle, float flyAngleRate, float flAccelZ, float flSpeed, float flGlideTime )
+{
+	if ( InitializeAsClientEntity( ENTITY_FLYING_BIRD_MODEL, RENDER_GROUP_OPAQUE_ENTITY ) == false )
+	{
+		Release();
+		return;
+	}
+
+	SetMoveType( MOVETYPE_FLY );
+	SetSolid( SOLID_BBOX );
+	SetCollisionGroup( COLLISION_GROUP_DEBRIS );
+	SetSize( -Vector(8,8,0), Vector(8,8,16) );
+
+	m_flyAngle = flyAngle;
+	m_flyAngleRate = flyAngleRate;
+	m_accelZ = flAccelZ;
+	m_flyZ = 0.0;
+	m_speed = flSpeed;
+
+	UpdateFlyDirection();
+
+	SetSequence( 0 );
+	SetPlaybackRate( 1.0f );
+	SetCycle( 0 );
+	ResetSequenceInfo();
+
+	// make sure the bird is removed
+	m_lifetimeTimer.Start( 10.0f );
+
+	m_glideTimer.Start( flGlideTime );
+
+	SetNextClientThink( CLIENT_THINK_ALWAYS );
+	m_timestamp = gpGlobals->curtime;
+
+	SetModelScale( 0.1f );
+	SetModelScale( 1.0f, 0.5f );
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Fly away!
+//-----------------------------------------------------------------------------
+void C_EntityFlyingBird::ClientThink( void )
+{
+	if ( m_lifetimeTimer.IsElapsed() )
+	{
+		Release();
+		return;
+	}
+
+	if ( m_glideTimer.HasStarted() && m_glideTimer.IsElapsed() )
+	{
+		SetSequence( 1 );
+		SetPlaybackRate( 1.0f );
+		SetCycle( 0 );
+		ResetSequenceInfo();
+		m_glideTimer.Invalidate();
+	}
+
+	StudioFrameAdvance();
+
+	PhysicsSimulate();
+
+	const float deltaT = gpGlobals->curtime - m_timestamp;
+	m_flyAngle += m_flyAngleRate * deltaT;
+	m_flyZ += m_accelZ * deltaT;
+
+	UpdateFlyDirection();
+
+	m_timestamp = gpGlobals->curtime;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+void C_EntityFlyingBird::Touch( CBaseEntity *pOther )
+{
+	if ( !pOther || !pOther->IsWorld() )
+		return;
+	
+	BaseClass::Touch( pOther );
+
+	// Die at next think. Not safe to remove ourselves during physics touch.
+	m_lifetimeTimer.Invalidate();
+}
+