implement pushing/shoving based on @NiLSPACE's suggestion

src/Entities/Pawn.cpp

@@ -4,6 +4,7 @@
 #include "Pawn.h"
 #include "../World.h"
 #include "../Bindings/PluginManager.h"
+#include "BoundingBox.h"
 
 
 
@@ -43,6 +44,41 @@ void cPawn::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 		
 		// TODO: Check for discrepancies between client and server effect values
 	}
+
+	class Pusher : public cEntityCallback
+	{
+	public:
+		cEntity * m_Pusher;
+
+		Pusher(cEntity * a_Pusher) :
+			m_Pusher(a_Pusher)
+		{
+		}
+
+		virtual bool Item(cEntity * a_Entity) override
+		{
+			if (a_Entity->GetUniqueID() == m_Pusher->GetUniqueID())
+			{
+				return false;
+			}
+
+			// we only push other mobs, boats and minecarts
+			if (a_Entity->GetEntityType() != etMonster && a_Entity->GetEntityType() != etMinecart && a_Entity->GetEntityType() != etBoat)
+			{
+				return false;
+			}
+
+			Vector3d v3Delta = a_Entity->GetPosition() - m_Pusher->GetPosition();
+			v3Delta.y = 0.0; // we only push sideways
+			v3Delta *= 1.0 / v3Delta.Length(); // we push harder if we're close
+			// QUESTION: is there an additional multiplier for this? current shoving seems a bit weak
+
+			a_Entity->AddSpeed(v3Delta);
+			return false;
+		}
+	} Callback(this);
+
+	m_World->ForEachEntityInBox(cBoundingBox(GetPosition(), GetWidth(), GetHeight()), Callback);
 	
 	super::Tick(a_Dt, a_Chunk);
 }