1 files changed, 129 insertions, 18 deletions

diff --git a/source/Entities/ProjectileEntity.cpp b/source/Entities/ProjectileEntity.cpp
index 350cad95b..4983943a9 100644
--- a/source/Entities/ProjectileEntity.cpp
+++ b/source/Entities/ProjectileEntity.cpp
@@ -7,6 +7,57 @@
 #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;
+	}
+} ;
 
 
 
@@ -18,7 +69,8 @@
 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_Creator(a_Creator),
+	m_IsInGround(false)
 {
 }
 
@@ -29,7 +81,8 @@ cProjectileEntity::cProjectileEntity(eKind a_Kind, cEntity * a_Creator, double a
 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_Creator(a_Creator),
+	m_IsInGround(false)
 {
 	SetSpeed(a_Speed);
 }
@@ -60,6 +113,35 @@ cProjectileEntity * cProjectileEntity::Create(eKind a_Kind, cEntity * a_Creator,
 
 
 
+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)
@@ -83,6 +165,51 @@ AString cProjectileEntity::GetMCAClassName(void) const
 
 
 
+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:
 
@@ -118,22 +245,6 @@ bool cArrowEntity::CanPickup(const cPlayer & a_Player) const
 
 
 
-void cArrowEntity::Tick(float a_Dt, cChunk & a_Chunk)
-{
-	super::Tick(a_Dt, a_Chunk);
-	
-	// DEBUG:
-	LOGD("Arrow %d: pos {%.02f, %.02f, %.02f}, speed {%.02f, %.02f, %.02f}",
-		m_UniqueID,
-		GetPosX(), GetPosY(), GetPosZ(),
-		GetSpeedX(), GetSpeedY(), GetSpeedZ()
-	);
-}
-
-
-
-
-
 void cArrowEntity::SpawnOn(cClientHandle & a_Client)
 {
 	a_Client.SendSpawnObject(*this, pkArrow, 0, 0, 0);