From cbfc740ad0ade4b8f03648ea52c16368d3a026a8 Mon Sep 17 00:00:00 2001
From: jclever77 <82078401+jclever77@users.noreply.github.com>
Date: Fri, 30 Apr 2021 07:39:10 -0400
Subject: Added functionality: mobs now enter boats and minecarts (#5214)

* Added functionality: mobs now enter boats and minecarts when coming into collision with them.

* Fixed basic style errors, nothing else

* Added self to contributors and reverted .gitignore to original state.
---
 src/Entities/Boat.cpp | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

(limited to 'src/Entities/Boat.cpp')

diff --git a/src/Entities/Boat.cpp b/src/Entities/Boat.cpp
index 1016773e9..cd66c523b 100644
--- a/src/Entities/Boat.cpp
+++ b/src/Entities/Boat.cpp
@@ -14,6 +14,36 @@
 
 
 
+class cBoatCollisionCallback
+{
+public:
+	cBoatCollisionCallback(cBoat * a_Boat, cEntity * a_Attachee) :
+		m_Boat(a_Boat), m_Attachee(a_Attachee)
+	{
+	}
+
+	bool operator()(cEntity & a_Entity)
+	{
+		// Checks if boat is empty and if given entity is a mob
+		if ((m_Attachee == nullptr) && (a_Entity.IsMob()))
+		{
+			// if so attach and return true
+			a_Entity.AttachTo(m_Boat);
+			return true;
+		}
+
+		return false;
+	}
+
+protected:
+	cBoat * m_Boat;
+	cEntity * m_Attachee;
+};
+
+
+
+
+
 cBoat::cBoat(Vector3d a_Pos, eMaterial a_Material) :
 	Super(etBoat, a_Pos, 1.375f, 0.5625f),
 	m_LastDamage(0), m_ForwardDirection(0),
@@ -311,3 +341,20 @@ cItem cBoat::MaterialToItem(eMaterial a_Material)
 
 
 
+
+void cBoat::HandlePhysics(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
+{
+	/** Special version of cEntity::HandlePhysics(...) function for boats, checks if mobs
+	colliding with the boat can be attached and does if that's the case, then returns to
+	normal physics calcualtions */
+
+	// Calculate boat's bounding box, run collision callback on all entities in said box
+	cBoatCollisionCallback BoatCollisionCallback(this, m_Attachee);
+	Vector3d BoatPosition = GetPosition();
+	cBoundingBox bbBoat(
+		Vector3d(BoatPosition.x, floor(BoatPosition.y), BoatPosition.z), GetWidth() / 2, GetHeight());
+	m_World->ForEachEntityInBox(bbBoat, BoatCollisionCallback);
+
+	// Return to calculating physics normally
+	Super::HandlePhysics(a_Dt, a_Chunk);
+}
-- 
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