Physics2D/Collider2D: Add support for neighbors vertices

ChangeLog.md

@@ -213,6 +213,7 @@ Nazara Engine:
 - Added ENetPeer::GetTotalPacketSent
 - ⚠ ENetHost::GetTotalReceivedPackets now returns the number of commands received (instead of the number of UDP packets received)
 - Added EmptyStream class, useful to measure how many bytes some writing operations will take
+- SegmentCollider2D: Add support for neighbors (aka "ghost vertices"), allowing to prevent seams collisions
 
 Nazara Development Kit:
 - Added ImageWidget (#139)

include/Nazara/Physics2D/Collider2D.hpp

@@ -230,13 +230,16 @@ namespace Nz
 	{
 		public:
 			inline SegmentCollider2D(const Vector2f& first, const Vector2f& second, float thickness = 1.f);
+			inline SegmentCollider2D(const Vector2f& first, const Vector2f& firstNeighbor, const Vector2f& second, const Vector2f& secondNeighbor, float thickness = 1.f);
 
 			Nz::Vector2f ComputeCenterOfMass() const override;
 			float ComputeMomentOfInertia(float mass) const override;
 
 			inline const Vector2f& GetFirstPoint() const;
+			inline const Vector2f& GetFirstPointNeighbor() const;
 			inline float GetLength() const;
 			inline const Vector2f& GetSecondPoint() const;
+			inline const Vector2f& GetSecondPointNeighbor() const;
 			inline float GetThickness() const;
 			ColliderType2D GetType() const override;
 
@@ -246,7 +249,9 @@ namespace Nz
 			std::size_t CreateShapes(RigidBody2D* body, std::vector<cpShape*>* shapes) const override;
 
 			Vector2f m_first;
+			Vector2f m_firstNeighbor;
 			Vector2f m_second;
+			Vector2f m_secondNeighbor;
 			float m_thickness;
 	};
 }

include/Nazara/Physics2D/Collider2D.inl

@@ -191,8 +191,15 @@ namespace Nz
 	}
 
 	SegmentCollider2D::SegmentCollider2D(const Vector2f& first, const Vector2f& second, float thickness) :
+	SegmentCollider2D(first, first, second, second, thickness)
+	{
+	}
+
+	inline SegmentCollider2D::SegmentCollider2D(const Vector2f& first, const Vector2f& firstNeighbor, const Vector2f& second, const Vector2f& secondNeighbor, float thickness) :
 	m_first(first),
+	m_firstNeighbor(firstNeighbor),
 	m_second(second),
+	m_secondNeighbor(secondNeighbor),
 	m_thickness(thickness)
 	{
 	}
@@ -202,6 +209,11 @@ namespace Nz
 		return m_first;
 	}
 
+	inline const Vector2f& SegmentCollider2D::GetFirstPointNeighbor() const
+	{
+		return m_firstNeighbor;
+	}
+
 	inline float SegmentCollider2D::GetLength() const
 	{
 		return m_first.Distance(m_second);
@@ -212,6 +224,11 @@ namespace Nz
 		return m_second;
 	}
 
+	inline const Vector2f& SegmentCollider2D::GetSecondPointNeighbor() const
+	{
+		return m_secondNeighbor;
+	}
+
 	inline float SegmentCollider2D::GetThickness() const
 	{
 		return m_thickness;

src/Nazara/Physics2D/Collider2D.cpp

@@ -298,7 +298,10 @@ namespace Nz
 
 	std::size_t SegmentCollider2D::CreateShapes(RigidBody2D* body, std::vector<cpShape*>* shapes) const
 	{
-		shapes->push_back(cpSegmentShapeNew(body->GetHandle(), cpv(m_first.x, m_first.y), cpv(m_second.x, m_second.y), m_thickness));
+		cpShape* segment = cpSegmentShapeNew(body->GetHandle(), cpv(m_first.x, m_first.y), cpv(m_second.x, m_second.y), m_thickness);
+		cpSegmentShapeSetNeighbors(segment, cpv(m_firstNeighbor.x, m_firstNeighbor.y), cpv(m_secondNeighbor.x, m_secondNeighbor.y));
+
+		shapes->push_back(segment);
 		return 1;
 	}
 }