diff options
Diffstat (limited to 'Client/ThirdParty/Box2D/include/box2d/b2_prismatic_joint.h')
| -rw-r--r-- | Client/ThirdParty/Box2D/include/box2d/b2_prismatic_joint.h | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/Client/ThirdParty/Box2D/include/box2d/b2_prismatic_joint.h b/Client/ThirdParty/Box2D/include/box2d/b2_prismatic_joint.h new file mode 100644 index 0000000..9d12d21 --- /dev/null +++ b/Client/ThirdParty/Box2D/include/box2d/b2_prismatic_joint.h @@ -0,0 +1,205 @@ +// MIT License + +// Copyright (c) 2019 Erin Catto + +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: + +// The above copyright notice and this permission notice shall be included in all +// copies or substantial portions of the Software. + +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +// SOFTWARE. + +#ifndef B2_PRISMATIC_JOINT_H +#define B2_PRISMATIC_JOINT_H + +#include "b2_api.h" +#include "b2_joint.h" + +/// Prismatic joint definition. This requires defining a line of +/// motion using an axis and an anchor point. The definition uses local +/// anchor points and a local axis so that the initial configuration +/// can violate the constraint slightly. The joint translation is zero +/// when the local anchor points coincide in world space. Using local +/// anchors and a local axis helps when saving and loading a game. +struct B2_API b2PrismaticJointDef : public b2JointDef +{ + b2PrismaticJointDef() + { + type = e_prismaticJoint; + localAnchorA.SetZero(); + localAnchorB.SetZero(); + localAxisA.Set(1.0f, 0.0f); + referenceAngle = 0.0f; + enableLimit = false; + lowerTranslation = 0.0f; + upperTranslation = 0.0f; + enableMotor = false; + maxMotorForce = 0.0f; + motorSpeed = 0.0f; + } + + /// Initialize the bodies, anchors, axis, and reference angle using the world + /// anchor and unit world axis. + void Initialize(b2Body* bodyA, b2Body* bodyB, const b2Vec2& anchor, const b2Vec2& axis); + + /// The local anchor point relative to bodyA's origin. + b2Vec2 localAnchorA; + + /// The local anchor point relative to bodyB's origin. + b2Vec2 localAnchorB; + + /// The local translation unit axis in bodyA. + b2Vec2 localAxisA; + + /// The constrained angle between the bodies: bodyB_angle - bodyA_angle. + float referenceAngle; + + /// Enable/disable the joint limit. + bool enableLimit; + + /// The lower translation limit, usually in meters. + float lowerTranslation; + + /// The upper translation limit, usually in meters. + float upperTranslation; + + /// Enable/disable the joint motor. + bool enableMotor; + + /// The maximum motor torque, usually in N-m. + float maxMotorForce; + + /// The desired motor speed in radians per second. + float motorSpeed; +}; + +/// A prismatic joint. This joint provides one degree of freedom: translation +/// along an axis fixed in bodyA. Relative rotation is prevented. You can +/// use a joint limit to restrict the range of motion and a joint motor to +/// drive the motion or to model joint friction. +class B2_API b2PrismaticJoint : public b2Joint +{ +public: + b2Vec2 GetAnchorA() const override; + b2Vec2 GetAnchorB() const override; + + b2Vec2 GetReactionForce(float inv_dt) const override; + float GetReactionTorque(float 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; } + + /// The local joint axis relative to bodyA. + const b2Vec2& GetLocalAxisA() const { return m_localXAxisA; } + + /// Get the reference angle. + float GetReferenceAngle() const { return m_referenceAngle; } + + /// Get the current joint translation, usually in meters. + float GetJointTranslation() const; + + /// Get the current joint translation speed, usually in meters per second. + float GetJointSpeed() const; + + /// Is the joint limit enabled? + bool IsLimitEnabled() const; + + /// Enable/disable the joint limit. + void EnableLimit(bool flag); + + /// Get the lower joint limit, usually in meters. + float GetLowerLimit() const; + + /// Get the upper joint limit, usually in meters. + float GetUpperLimit() const; + + /// Set the joint limits, usually in meters. + void SetLimits(float lower, float upper); + + /// Is the joint motor enabled? + bool IsMotorEnabled() const; + + /// Enable/disable the joint motor. + void EnableMotor(bool flag); + + /// Set the motor speed, usually in meters per second. + void SetMotorSpeed(float speed); + + /// Get the motor speed, usually in meters per second. + float GetMotorSpeed() const; + + /// Set the maximum motor force, usually in N. + void SetMaxMotorForce(float force); + float GetMaxMotorForce() const { return m_maxMotorForce; } + + /// Get the current motor force given the inverse time step, usually in N. + float GetMotorForce(float inv_dt) const; + + /// Dump to b2Log + void Dump() override; + + /// + void Draw(b2Draw* draw) const override; + +protected: + friend class b2Joint; + friend class b2GearJoint; + b2PrismaticJoint(const b2PrismaticJointDef* def); + + void InitVelocityConstraints(const b2SolverData& data) override; + void SolveVelocityConstraints(const b2SolverData& data) override; + bool SolvePositionConstraints(const b2SolverData& data) override; + + b2Vec2 m_localAnchorA; + b2Vec2 m_localAnchorB; + b2Vec2 m_localXAxisA; + b2Vec2 m_localYAxisA; + float m_referenceAngle; + b2Vec2 m_impulse; + float m_motorImpulse; + float m_lowerImpulse; + float m_upperImpulse; + float m_lowerTranslation; + float m_upperTranslation; + float m_maxMotorForce; + float m_motorSpeed; + bool m_enableLimit; + bool m_enableMotor; + + // Solver temp + int32 m_indexA; + int32 m_indexB; + b2Vec2 m_localCenterA; + b2Vec2 m_localCenterB; + float m_invMassA; + float m_invMassB; + float m_invIA; + float m_invIB; + b2Vec2 m_axis, m_perp; + float m_s1, m_s2; + float m_a1, m_a2; + b2Mat22 m_K; + float m_translation; + float m_axialMass; +}; + +inline float b2PrismaticJoint::GetMotorSpeed() const +{ + return m_motorSpeed; +} + +#endif |