1 files changed, 296 insertions, 0 deletions

diff --git a/source/Entities/ProjectileEntity.cpp b/source/Entities/ProjectileEntity.cpp
new file mode 100644
index 000000000..f405e9aa4
--- /dev/null
+++ b/source/Entities/ProjectileEntity.cpp
@@ -0,0 +1,296 @@
+
+// ProjectileEntity.cpp
+
+// Implements the cProjectileEntity class representing the common base class for projectiles, as well as individual projectile types
+
+#include "Globals.h"
+#include "ProjectileEntity.h"
+#include "../ClientHandle.h"
+#include "Player.h"
+#include "../LineBlockTracer.h"
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cProjectileTracerCallback:
+
+class cProjectileTracerCallback :
+	public cBlockTracer::cCallbacks
+{
+public:
+	cProjectileTracerCallback(cProjectileEntity * a_Projectile) :
+		m_Projectile(a_Projectile)
+	{
+	}
+	
+protected:
+	cProjectileEntity * m_Projectile;
+	
+	virtual bool OnNextBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, char a_EntryFace) override
+	{
+		if (g_BlockIsSolid[a_BlockType])
+		{
+			// The projectile hit a solid block
+			m_Projectile->OnHitSolidBlock(a_BlockX, a_BlockY, a_BlockZ, a_EntryFace);
+			return true;
+		}
+		
+		// Convey some special effects from special blocks:
+		switch (a_BlockType)
+		{
+			case E_BLOCK_LAVA:
+			case E_BLOCK_STATIONARY_LAVA:
+			{
+				m_Projectile->StartBurning(30);
+				break;
+			}
+			case E_BLOCK_WATER:
+			case E_BLOCK_STATIONARY_WATER:
+			{
+				m_Projectile->StopBurning();
+				break;
+			}
+		}  // switch (a_BlockType)
+		
+		// Continue tracing
+		return false;
+	}
+} ;
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cProjectileEntity:
+
+cProjectileEntity::cProjectileEntity(eKind a_Kind, cEntity * a_Creator, double a_X, double a_Y, double a_Z, double a_Width, double a_Height) :
+	super(etProjectile, a_X, a_Y, a_Z, a_Width, a_Height),
+	m_ProjectileKind(a_Kind),
+	m_Creator(a_Creator),
+	m_IsInGround(false)
+{
+}
+
+
+
+
+
+cProjectileEntity::cProjectileEntity(eKind a_Kind, cEntity * a_Creator, const Vector3d & a_Pos, const Vector3d & a_Speed, double a_Width, double a_Height) :
+	super(etProjectile, a_Pos.x, a_Pos.y, a_Pos.z, a_Width, a_Height),
+	m_ProjectileKind(a_Kind),
+	m_Creator(a_Creator),
+	m_IsInGround(false)
+{
+	SetSpeed(a_Speed);
+}
+
+
+
+
+
+cProjectileEntity * cProjectileEntity::Create(eKind a_Kind, cEntity * a_Creator, double a_X, double a_Y, double a_Z, const Vector3d * a_Speed)
+{
+	Vector3d Speed;
+	if (a_Speed != NULL)
+	{
+		Speed = *a_Speed;
+	}
+
+	switch (a_Kind)
+	{
+		case pkArrow: return new cArrowEntity(a_Creator, a_X, a_Y, a_Z, Speed);
+		// TODO: the rest
+	}
+	
+	LOGWARNING("%s: Unknown kind: %d", __FUNCTION__, a_Kind);
+	return NULL;
+}
+
+
+
+
+
+void cProjectileEntity::OnHitSolidBlock(int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace)
+{
+	// TODO: Set proper position based on what face was hit
+	switch (a_BlockFace)
+	{
+		case BLOCK_FACE_TOP:    SetPosition(0.5 + a_BlockX, 1.0 + a_BlockY, 0.5 + a_BlockZ); break;
+		case BLOCK_FACE_BOTTOM: SetPosition(0.5 + a_BlockX,       a_BlockY, 0.5 + a_BlockZ); break;
+		case BLOCK_FACE_EAST:   SetPosition(      a_BlockX, 0.5 + a_BlockY, 0.5 + a_BlockZ); break;
+		case BLOCK_FACE_WEST:   SetPosition(1.0 + a_BlockX, 0.5 + a_BlockY, 0.5 + a_BlockZ); break;
+		case BLOCK_FACE_NORTH:  SetPosition(0.5 + a_BlockX, 0.5 + a_BlockY, 1.0 + a_BlockZ); break;
+		case BLOCK_FACE_SOUTH:  SetPosition(0.5 + a_BlockX, 0.5 + a_BlockY,       a_BlockZ); break;
+		case BLOCK_FACE_NONE:   SetPosition(0.5 + a_BlockX, 0.5 + a_BlockY, 0.5 + a_BlockZ); break;
+	}
+	SetSpeed(0, 0, 0);
+
+	// DEBUG:
+	LOGD("Projectile %d: pos {%.02f, %.02f, %.02f}, hit solid block at face %d",
+		m_UniqueID,
+		GetPosX(), GetPosY(), GetPosZ(),
+		a_BlockFace
+	);
+
+	m_IsInGround = true;
+}
+
+
+
+
+
+AString cProjectileEntity::GetMCAClassName(void) const
+{
+	switch (m_ProjectileKind)
+	{
+		case pkArrow:         return "Arrow";
+		case pkSnowball:      return "Snowball";
+		case pkEgg:           return "Egg";
+		case pkGhastFireball: return "Fireball";
+		case pkFireCharge:    return "SmallFireball";
+		case pkEnderPearl:    return "ThrownEnderPearl";
+		case pkExpBottle:     return "ThrownExpBottle";
+		case pkSplashPotion:  return "ThrownPotion";
+		case pkWitherSkull:   return "WitherSkull";
+		case pkFishingFloat:  return "";  // Unknown, perhaps MC doesn't save this?
+	}
+	ASSERT(!"Unhandled projectile entity kind!");
+	return "";
+}
+
+
+
+
+
+void cProjectileEntity::Tick(float a_Dt, cChunk & a_Chunk)
+{
+	super::Tick(a_Dt, a_Chunk);
+	BroadcastMovementUpdate();
+}
+
+
+
+
+
+void cProjectileEntity::HandlePhysics(float a_Dt, cChunk & a_Chunk)
+{
+	if (m_IsInGround)
+	{
+		// Already-grounded projectiles don't move at all
+		return;
+	}
+	
+	Vector3d PerTickSpeed = GetSpeed() / 20;
+	Vector3d Pos = GetPosition();
+	
+	// Trace the tick's worth of movement as a line:
+	Vector3d NextPos = Pos + PerTickSpeed;
+	cProjectileTracerCallback TracerCallback(this);
+	if (cLineBlockTracer::Trace(*m_World, TracerCallback, Pos, NextPos))
+	{
+		// Nothing in the way, update the position
+		SetPosition(NextPos);
+	}
+	
+	// Add gravity effect to the vertical speed component:
+	SetSpeedY(GetSpeedY() + m_Gravity / 20);
+
+	// DEBUG:
+	LOGD("Arrow %d: pos {%.02f, %.02f, %.02f}, speed {%.02f, %.02f, %.02f}",
+		m_UniqueID,
+		GetPosX(), GetPosY(), GetPosZ(),
+		GetSpeedX(), GetSpeedY(), GetSpeedZ()
+	);
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cArrowEntity:
+
+cArrowEntity::cArrowEntity(cEntity * a_Creator, double a_X, double a_Y, double a_Z, const Vector3d a_Speed) :
+	super(pkArrow, a_Creator, a_X, a_Y, a_Z, 0.5, 0.5),
+	m_PickupState(psNoPickup),
+	m_DamageCoeff(2)
+{
+	SetSpeed(a_Speed);
+	SetMass(0.1);
+	LOGD("Created arrow %d with speed {%.02f, %.02f, %.02f}",
+		m_UniqueID, GetSpeedX(), GetSpeedY(), GetSpeedZ()
+	);
+}
+
+
+
+
+
+cArrowEntity::cArrowEntity(cPlayer & a_Player, double a_Force) :
+	super(pkArrow, &a_Player, PosFromPlayerPos(a_Player), SpeedFromPlayerLook(a_Player, a_Force), 0.5, 0.5),
+	m_PickupState(psInSurvivalOrCreative),
+	m_DamageCoeff(2)
+{
+}
+
+
+
+
+
+Vector3d cArrowEntity::PosFromPlayerPos(const cPlayer & a_Player)
+{
+	Vector3d res = a_Player.GetEyePosition();
+	
+	// Adjust the position to be just outside the player's bounding box:
+	res.x += 0.16 * cos(a_Player.GetPitch());
+	res.y += -0.1;
+	res.z += 0.16 * sin(a_Player.GetPitch());
+	
+	return res;
+}
+
+
+
+
+
+Vector3d cArrowEntity::SpeedFromPlayerLook(const cPlayer & a_Player, double a_Force)
+{
+	Vector3d res = a_Player.GetLookVector();
+	res.Normalize();
+	
+	// TODO: Add a slight random change (+-0.0075 in each direction)
+	
+	return res * a_Force * 1.5 * 20;
+}
+
+
+
+
+
+bool cArrowEntity::CanPickup(const cPlayer & a_Player) const
+{
+	switch (m_PickupState)
+	{
+		case psNoPickup:             return false;
+		case psInSurvivalOrCreative: return (a_Player.IsGameModeSurvival() || a_Player.IsGameModeCreative());
+		case psInCreative:           return a_Player.IsGameModeCreative();
+	}
+	ASSERT(!"Unhandled pickup state");
+	return false;
+}
+
+
+
+
+
+void cArrowEntity::SpawnOn(cClientHandle & a_Client)
+{
+	a_Client.SendSpawnObject(*this, pkArrow, 0, 0, 0);
+}
+
+
+
+