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-/*
-* Copyright (c) 2006-2011 Erin Catto http://www.box2d.org
-*
-* This software is provided 'as-is', without any express or implied
-* warranty. In no event will the authors be held liable for any damages
-* arising from the use of this software.
-* Permission is granted to anyone to use this software for any purpose,
-* including commercial applications, and to alter it and redistribute it
-* freely, subject to the following restrictions:
-* 1. The origin of this software must not be misrepresented; you must not
-* claim that you wrote the original software. If you use this software
-* in a product, an acknowledgment in the product documentation would be
-* appreciated but is not required.
-* 2. Altered source versions must be plainly marked as such, and must not be
-* misrepresented as being the original software.
-* 3. This notice may not be removed or altered from any source distribution.
-*/
-
-#ifndef B2_ROPE_JOINT_H
-#define B2_ROPE_JOINT_H
-
-#include "Box2D/Dynamics/Joints/b2Joint.h"
-
-/// Rope joint definition. This requires two body anchor points and
-/// a maximum lengths.
-/// Note: by default the connected objects will not collide.
-/// see collideConnected in b2JointDef.
-struct b2RopeJointDef : public b2JointDef
-{
- b2RopeJointDef()
- {
- type = e_ropeJoint;
- localAnchorA.Set(-1.0f, 0.0f);
- localAnchorB.Set(1.0f, 0.0f);
- maxLength = 0.0f;
- }
-
- /// The local anchor point relative to bodyA's origin.
- b2Vec2 localAnchorA;
-
- /// The local anchor point relative to bodyB's origin.
- b2Vec2 localAnchorB;
-
- /// The maximum length of the rope.
- /// Warning: this must be larger than b2_linearSlop or
- /// the joint will have no effect.
- float32 maxLength;
-};
-
-/// A rope joint enforces a maximum distance between two points
-/// on two bodies. It has no other effect.
-/// Warning: if you attempt to change the maximum length during
-/// the simulation you will get some non-physical behavior.
-/// A model that would allow you to dynamically modify the length
-/// would have some sponginess, so I chose not to implement it
-/// that way. See b2DistanceJoint if you want to dynamically
-/// control length.
-class b2RopeJoint : public b2Joint
-{
-public:
- b2Vec2 GetAnchorA() const override;
- b2Vec2 GetAnchorB() const override;
-
- b2Vec2 GetReactionForce(float32 inv_dt) const override;
- float32 GetReactionTorque(float32 inv_dt) const override;
-
- /// The local anchor point relative to bodyA's origin.
- const b2Vec2& GetLocalAnchorA() const { return m_localAnchorA; }
-
- /// The local anchor point relative to bodyB's origin.
- const b2Vec2& GetLocalAnchorB() const { return m_localAnchorB; }
-
- /// Set/Get the maximum length of the rope.
- void SetMaxLength(float32 length) { m_maxLength = length; }
- float32 GetMaxLength() const;
-
- b2LimitState GetLimitState() const;
-
- /// Dump joint to dmLog
- void Dump() override;
-
-protected:
-
- friend class b2Joint;
- b2RopeJoint(const b2RopeJointDef* data);
-
- void InitVelocityConstraints(const b2SolverData& data) override;
- void SolveVelocityConstraints(const b2SolverData& data) override;
- bool SolvePositionConstraints(const b2SolverData& data) override;
-
- // Solver shared
- b2Vec2 m_localAnchorA;
- b2Vec2 m_localAnchorB;
- float32 m_maxLength;
- float32 m_length;
- float32 m_impulse;
-
- // Solver temp
- int32 m_indexA;
- int32 m_indexB;
- b2Vec2 m_u;
- b2Vec2 m_rA;
- b2Vec2 m_rB;
- b2Vec2 m_localCenterA;
- b2Vec2 m_localCenterB;
- float32 m_invMassA;
- float32 m_invMassB;
- float32 m_invIA;
- float32 m_invIB;
- float32 m_mass;
- b2LimitState m_state;
-};
-
-#endif