512 lines
13 KiB
C++
512 lines
13 KiB
C++
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/*
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* Copyright (c) 2006-2011 Erin Catto http://www.box2d.org
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#include "Box2D/Dynamics/Joints/b2RevoluteJoint.h"
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#include "Box2D/Dynamics/b2Body.h"
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#include "Box2D/Dynamics/b2TimeStep.h"
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// Point-to-point constraint
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// C = p2 - p1
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// Cdot = v2 - v1
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// = v2 + cross(w2, r2) - v1 - cross(w1, r1)
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// J = [-I -r1_skew I r2_skew ]
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// Identity used:
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// w k % (rx i + ry j) = w * (-ry i + rx j)
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// Motor constraint
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// Cdot = w2 - w1
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// J = [0 0 -1 0 0 1]
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// K = invI1 + invI2
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void b2RevoluteJointDef::Initialize(b2Body* bA, b2Body* bB, const b2Vec2& anchor)
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{
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bodyA = bA;
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bodyB = bB;
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localAnchorA = bodyA->GetLocalPoint(anchor);
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localAnchorB = bodyB->GetLocalPoint(anchor);
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referenceAngle = bodyB->GetAngle() - bodyA->GetAngle();
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}
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b2RevoluteJoint::b2RevoluteJoint(const b2RevoluteJointDef* def)
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: b2Joint(def)
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{
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m_localAnchorA = def->localAnchorA;
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m_localAnchorB = def->localAnchorB;
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m_referenceAngle = def->referenceAngle;
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m_impulse.SetZero();
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m_motorImpulse = 0.0f;
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m_lowerAngle = def->lowerAngle;
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m_upperAngle = def->upperAngle;
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m_maxMotorTorque = def->maxMotorTorque;
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m_motorSpeed = def->motorSpeed;
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m_enableLimit = def->enableLimit;
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m_enableMotor = def->enableMotor;
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m_limitState = e_inactiveLimit;
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}
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void b2RevoluteJoint::InitVelocityConstraints(const b2SolverData& data)
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{
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m_indexA = m_bodyA->m_islandIndex;
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m_indexB = m_bodyB->m_islandIndex;
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m_localCenterA = m_bodyA->m_sweep.localCenter;
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m_localCenterB = m_bodyB->m_sweep.localCenter;
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m_invMassA = m_bodyA->m_invMass;
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m_invMassB = m_bodyB->m_invMass;
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m_invIA = m_bodyA->m_invI;
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m_invIB = m_bodyB->m_invI;
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float32 aA = data.positions[m_indexA].a;
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b2Vec2 vA = data.velocities[m_indexA].v;
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float32 wA = data.velocities[m_indexA].w;
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float32 aB = data.positions[m_indexB].a;
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b2Vec2 vB = data.velocities[m_indexB].v;
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float32 wB = data.velocities[m_indexB].w;
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b2Rot qA(aA), qB(aB);
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m_rA = b2Mul(qA, m_localAnchorA - m_localCenterA);
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m_rB = b2Mul(qB, m_localAnchorB - m_localCenterB);
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// J = [-I -r1_skew I r2_skew]
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// [ 0 -1 0 1]
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// r_skew = [-ry; rx]
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// Matlab
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// K = [ mA+r1y^2*iA+mB+r2y^2*iB, -r1y*iA*r1x-r2y*iB*r2x, -r1y*iA-r2y*iB]
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// [ -r1y*iA*r1x-r2y*iB*r2x, mA+r1x^2*iA+mB+r2x^2*iB, r1x*iA+r2x*iB]
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// [ -r1y*iA-r2y*iB, r1x*iA+r2x*iB, iA+iB]
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float32 mA = m_invMassA, mB = m_invMassB;
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float32 iA = m_invIA, iB = m_invIB;
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bool fixedRotation = (iA + iB == 0.0f);
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m_mass.ex.x = mA + mB + m_rA.y * m_rA.y * iA + m_rB.y * m_rB.y * iB;
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m_mass.ey.x = -m_rA.y * m_rA.x * iA - m_rB.y * m_rB.x * iB;
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m_mass.ez.x = -m_rA.y * iA - m_rB.y * iB;
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m_mass.ex.y = m_mass.ey.x;
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m_mass.ey.y = mA + mB + m_rA.x * m_rA.x * iA + m_rB.x * m_rB.x * iB;
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m_mass.ez.y = m_rA.x * iA + m_rB.x * iB;
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m_mass.ex.z = m_mass.ez.x;
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m_mass.ey.z = m_mass.ez.y;
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m_mass.ez.z = iA + iB;
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m_motorMass = iA + iB;
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if (m_motorMass > 0.0f)
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{
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m_motorMass = 1.0f / m_motorMass;
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}
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if (m_enableMotor == false || fixedRotation)
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{
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m_motorImpulse = 0.0f;
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}
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if (m_enableLimit && fixedRotation == false)
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{
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float32 jointAngle = aB - aA - m_referenceAngle;
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if (b2Abs(m_upperAngle - m_lowerAngle) < 2.0f * b2_angularSlop)
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{
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m_limitState = e_equalLimits;
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}
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else if (jointAngle <= m_lowerAngle)
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{
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if (m_limitState != e_atLowerLimit)
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{
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m_impulse.z = 0.0f;
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}
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m_limitState = e_atLowerLimit;
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}
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else if (jointAngle >= m_upperAngle)
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{
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if (m_limitState != e_atUpperLimit)
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{
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m_impulse.z = 0.0f;
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}
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m_limitState = e_atUpperLimit;
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}
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else
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{
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m_limitState = e_inactiveLimit;
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m_impulse.z = 0.0f;
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}
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}
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else
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{
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m_limitState = e_inactiveLimit;
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}
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if (data.step.warmStarting)
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{
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// Scale impulses to support a variable time step.
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m_impulse *= data.step.dtRatio;
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m_motorImpulse *= data.step.dtRatio;
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b2Vec2 P(m_impulse.x, m_impulse.y);
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vA -= mA * P;
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wA -= iA * (b2Cross(m_rA, P) + m_motorImpulse + m_impulse.z);
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vB += mB * P;
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wB += iB * (b2Cross(m_rB, P) + m_motorImpulse + m_impulse.z);
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}
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else
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{
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m_impulse.SetZero();
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m_motorImpulse = 0.0f;
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}
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data.velocities[m_indexA].v = vA;
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data.velocities[m_indexA].w = wA;
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data.velocities[m_indexB].v = vB;
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data.velocities[m_indexB].w = wB;
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}
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void b2RevoluteJoint::SolveVelocityConstraints(const b2SolverData& data)
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{
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b2Vec2 vA = data.velocities[m_indexA].v;
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float32 wA = data.velocities[m_indexA].w;
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b2Vec2 vB = data.velocities[m_indexB].v;
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float32 wB = data.velocities[m_indexB].w;
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float32 mA = m_invMassA, mB = m_invMassB;
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float32 iA = m_invIA, iB = m_invIB;
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bool fixedRotation = (iA + iB == 0.0f);
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// Solve motor constraint.
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if (m_enableMotor && m_limitState != e_equalLimits && fixedRotation == false)
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{
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float32 Cdot = wB - wA - m_motorSpeed;
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float32 impulse = -m_motorMass * Cdot;
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float32 oldImpulse = m_motorImpulse;
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float32 maxImpulse = data.step.dt * m_maxMotorTorque;
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m_motorImpulse = b2Clamp(m_motorImpulse + impulse, -maxImpulse, maxImpulse);
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impulse = m_motorImpulse - oldImpulse;
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wA -= iA * impulse;
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wB += iB * impulse;
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}
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// Solve limit constraint.
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if (m_enableLimit && m_limitState != e_inactiveLimit && fixedRotation == false)
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{
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b2Vec2 Cdot1 = vB + b2Cross(wB, m_rB) - vA - b2Cross(wA, m_rA);
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float32 Cdot2 = wB - wA;
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b2Vec3 Cdot(Cdot1.x, Cdot1.y, Cdot2);
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b2Vec3 impulse = -m_mass.Solve33(Cdot);
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if (m_limitState == e_equalLimits)
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{
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m_impulse += impulse;
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}
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else if (m_limitState == e_atLowerLimit)
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{
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float32 newImpulse = m_impulse.z + impulse.z;
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if (newImpulse < 0.0f)
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{
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b2Vec2 rhs = -Cdot1 + m_impulse.z * b2Vec2(m_mass.ez.x, m_mass.ez.y);
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b2Vec2 reduced = m_mass.Solve22(rhs);
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impulse.x = reduced.x;
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impulse.y = reduced.y;
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impulse.z = -m_impulse.z;
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m_impulse.x += reduced.x;
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m_impulse.y += reduced.y;
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m_impulse.z = 0.0f;
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}
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else
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{
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m_impulse += impulse;
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}
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}
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else if (m_limitState == e_atUpperLimit)
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{
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float32 newImpulse = m_impulse.z + impulse.z;
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if (newImpulse > 0.0f)
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{
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b2Vec2 rhs = -Cdot1 + m_impulse.z * b2Vec2(m_mass.ez.x, m_mass.ez.y);
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b2Vec2 reduced = m_mass.Solve22(rhs);
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impulse.x = reduced.x;
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impulse.y = reduced.y;
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impulse.z = -m_impulse.z;
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m_impulse.x += reduced.x;
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m_impulse.y += reduced.y;
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m_impulse.z = 0.0f;
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}
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else
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{
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m_impulse += impulse;
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}
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}
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b2Vec2 P(impulse.x, impulse.y);
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vA -= mA * P;
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wA -= iA * (b2Cross(m_rA, P) + impulse.z);
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vB += mB * P;
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wB += iB * (b2Cross(m_rB, P) + impulse.z);
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}
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else
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{
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// Solve point-to-point constraint
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b2Vec2 Cdot = vB + b2Cross(wB, m_rB) - vA - b2Cross(wA, m_rA);
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b2Vec2 impulse = m_mass.Solve22(-Cdot);
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m_impulse.x += impulse.x;
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m_impulse.y += impulse.y;
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vA -= mA * impulse;
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wA -= iA * b2Cross(m_rA, impulse);
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vB += mB * impulse;
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wB += iB * b2Cross(m_rB, impulse);
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}
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data.velocities[m_indexA].v = vA;
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data.velocities[m_indexA].w = wA;
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data.velocities[m_indexB].v = vB;
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data.velocities[m_indexB].w = wB;
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}
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bool b2RevoluteJoint::SolvePositionConstraints(const b2SolverData& data)
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{
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b2Vec2 cA = data.positions[m_indexA].c;
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float32 aA = data.positions[m_indexA].a;
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b2Vec2 cB = data.positions[m_indexB].c;
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float32 aB = data.positions[m_indexB].a;
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b2Rot qA(aA), qB(aB);
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float32 angularError = 0.0f;
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float32 positionError = 0.0f;
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bool fixedRotation = (m_invIA + m_invIB == 0.0f);
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// Solve angular limit constraint.
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if (m_enableLimit && m_limitState != e_inactiveLimit && fixedRotation == false)
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{
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float32 angle = aB - aA - m_referenceAngle;
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float32 limitImpulse = 0.0f;
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if (m_limitState == e_equalLimits)
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{
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// Prevent large angular corrections
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float32 C = b2Clamp(angle - m_lowerAngle, -b2_maxAngularCorrection, b2_maxAngularCorrection);
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limitImpulse = -m_motorMass * C;
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angularError = b2Abs(C);
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}
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else if (m_limitState == e_atLowerLimit)
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{
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float32 C = angle - m_lowerAngle;
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angularError = -C;
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// Prevent large angular corrections and allow some slop.
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C = b2Clamp(C + b2_angularSlop, -b2_maxAngularCorrection, 0.0f);
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limitImpulse = -m_motorMass * C;
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}
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else if (m_limitState == e_atUpperLimit)
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{
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float32 C = angle - m_upperAngle;
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angularError = C;
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// Prevent large angular corrections and allow some slop.
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C = b2Clamp(C - b2_angularSlop, 0.0f, b2_maxAngularCorrection);
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limitImpulse = -m_motorMass * C;
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}
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aA -= m_invIA * limitImpulse;
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aB += m_invIB * limitImpulse;
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|
}
|
||
|
|
|
||
|
|
// Solve point-to-point constraint.
|
||
|
|
{
|
||
|
|
qA.Set(aA);
|
||
|
|
qB.Set(aB);
|
||
|
|
b2Vec2 rA = b2Mul(qA, m_localAnchorA - m_localCenterA);
|
||
|
|
b2Vec2 rB = b2Mul(qB, m_localAnchorB - m_localCenterB);
|
||
|
|
|
||
|
|
b2Vec2 C = cB + rB - cA - rA;
|
||
|
|
positionError = C.Length();
|
||
|
|
|
||
|
|
float32 mA = m_invMassA, mB = m_invMassB;
|
||
|
|
float32 iA = m_invIA, iB = m_invIB;
|
||
|
|
|
||
|
|
b2Mat22 K;
|
||
|
|
K.ex.x = mA + mB + iA * rA.y * rA.y + iB * rB.y * rB.y;
|
||
|
|
K.ex.y = -iA * rA.x * rA.y - iB * rB.x * rB.y;
|
||
|
|
K.ey.x = K.ex.y;
|
||
|
|
K.ey.y = mA + mB + iA * rA.x * rA.x + iB * rB.x * rB.x;
|
||
|
|
|
||
|
|
b2Vec2 impulse = -K.Solve(C);
|
||
|
|
|
||
|
|
cA -= mA * impulse;
|
||
|
|
aA -= iA * b2Cross(rA, impulse);
|
||
|
|
|
||
|
|
cB += mB * impulse;
|
||
|
|
aB += iB * b2Cross(rB, impulse);
|
||
|
|
}
|
||
|
|
|
||
|
|
data.positions[m_indexA].c = cA;
|
||
|
|
data.positions[m_indexA].a = aA;
|
||
|
|
data.positions[m_indexB].c = cB;
|
||
|
|
data.positions[m_indexB].a = aB;
|
||
|
|
|
||
|
|
return positionError <= b2_linearSlop && angularError <= b2_angularSlop;
|
||
|
|
}
|
||
|
|
|
||
|
|
b2Vec2 b2RevoluteJoint::GetAnchorA() const
|
||
|
|
{
|
||
|
|
return m_bodyA->GetWorldPoint(m_localAnchorA);
|
||
|
|
}
|
||
|
|
|
||
|
|
b2Vec2 b2RevoluteJoint::GetAnchorB() const
|
||
|
|
{
|
||
|
|
return m_bodyB->GetWorldPoint(m_localAnchorB);
|
||
|
|
}
|
||
|
|
|
||
|
|
b2Vec2 b2RevoluteJoint::GetReactionForce(float32 inv_dt) const
|
||
|
|
{
|
||
|
|
b2Vec2 P(m_impulse.x, m_impulse.y);
|
||
|
|
return inv_dt * P;
|
||
|
|
}
|
||
|
|
|
||
|
|
float32 b2RevoluteJoint::GetReactionTorque(float32 inv_dt) const
|
||
|
|
{
|
||
|
|
return inv_dt * m_impulse.z;
|
||
|
|
}
|
||
|
|
|
||
|
|
float32 b2RevoluteJoint::GetJointAngle() const
|
||
|
|
{
|
||
|
|
b2Body* bA = m_bodyA;
|
||
|
|
b2Body* bB = m_bodyB;
|
||
|
|
return bB->m_sweep.a - bA->m_sweep.a - m_referenceAngle;
|
||
|
|
}
|
||
|
|
|
||
|
|
float32 b2RevoluteJoint::GetJointSpeed() const
|
||
|
|
{
|
||
|
|
b2Body* bA = m_bodyA;
|
||
|
|
b2Body* bB = m_bodyB;
|
||
|
|
return bB->m_angularVelocity - bA->m_angularVelocity;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool b2RevoluteJoint::IsMotorEnabled() const
|
||
|
|
{
|
||
|
|
return m_enableMotor;
|
||
|
|
}
|
||
|
|
|
||
|
|
void b2RevoluteJoint::EnableMotor(bool flag)
|
||
|
|
{
|
||
|
|
if (flag != m_enableMotor)
|
||
|
|
{
|
||
|
|
m_bodyA->SetAwake(true);
|
||
|
|
m_bodyB->SetAwake(true);
|
||
|
|
m_enableMotor = flag;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
float32 b2RevoluteJoint::GetMotorTorque(float32 inv_dt) const
|
||
|
|
{
|
||
|
|
return inv_dt * m_motorImpulse;
|
||
|
|
}
|
||
|
|
|
||
|
|
void b2RevoluteJoint::SetMotorSpeed(float32 speed)
|
||
|
|
{
|
||
|
|
if (speed != m_motorSpeed)
|
||
|
|
{
|
||
|
|
m_bodyA->SetAwake(true);
|
||
|
|
m_bodyB->SetAwake(true);
|
||
|
|
m_motorSpeed = speed;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void b2RevoluteJoint::SetMaxMotorTorque(float32 torque)
|
||
|
|
{
|
||
|
|
if (torque != m_maxMotorTorque)
|
||
|
|
{
|
||
|
|
m_bodyA->SetAwake(true);
|
||
|
|
m_bodyB->SetAwake(true);
|
||
|
|
m_maxMotorTorque = torque;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
bool b2RevoluteJoint::IsLimitEnabled() const
|
||
|
|
{
|
||
|
|
return m_enableLimit;
|
||
|
|
}
|
||
|
|
|
||
|
|
void b2RevoluteJoint::EnableLimit(bool flag)
|
||
|
|
{
|
||
|
|
if (flag != m_enableLimit)
|
||
|
|
{
|
||
|
|
m_bodyA->SetAwake(true);
|
||
|
|
m_bodyB->SetAwake(true);
|
||
|
|
m_enableLimit = flag;
|
||
|
|
m_impulse.z = 0.0f;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
float32 b2RevoluteJoint::GetLowerLimit() const
|
||
|
|
{
|
||
|
|
return m_lowerAngle;
|
||
|
|
}
|
||
|
|
|
||
|
|
float32 b2RevoluteJoint::GetUpperLimit() const
|
||
|
|
{
|
||
|
|
return m_upperAngle;
|
||
|
|
}
|
||
|
|
|
||
|
|
void b2RevoluteJoint::SetLimits(float32 lower, float32 upper)
|
||
|
|
{
|
||
|
|
b2Assert(lower <= upper);
|
||
|
|
|
||
|
|
if (lower != m_lowerAngle || upper != m_upperAngle)
|
||
|
|
{
|
||
|
|
m_bodyA->SetAwake(true);
|
||
|
|
m_bodyB->SetAwake(true);
|
||
|
|
m_impulse.z = 0.0f;
|
||
|
|
m_lowerAngle = lower;
|
||
|
|
m_upperAngle = upper;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void b2RevoluteJoint::Dump()
|
||
|
|
{
|
||
|
|
int32 indexA = m_bodyA->m_islandIndex;
|
||
|
|
int32 indexB = m_bodyB->m_islandIndex;
|
||
|
|
|
||
|
|
b2Log(" b2RevoluteJointDef jd;\n");
|
||
|
|
b2Log(" jd.bodyA = bodies[%d];\n", indexA);
|
||
|
|
b2Log(" jd.bodyB = bodies[%d];\n", indexB);
|
||
|
|
b2Log(" jd.collideConnected = bool(%d);\n", m_collideConnected);
|
||
|
|
b2Log(" jd.localAnchorA.Set(%.15lef, %.15lef);\n", m_localAnchorA.x, m_localAnchorA.y);
|
||
|
|
b2Log(" jd.localAnchorB.Set(%.15lef, %.15lef);\n", m_localAnchorB.x, m_localAnchorB.y);
|
||
|
|
b2Log(" jd.referenceAngle = %.15lef;\n", m_referenceAngle);
|
||
|
|
b2Log(" jd.enableLimit = bool(%d);\n", m_enableLimit);
|
||
|
|
b2Log(" jd.lowerAngle = %.15lef;\n", m_lowerAngle);
|
||
|
|
b2Log(" jd.upperAngle = %.15lef;\n", m_upperAngle);
|
||
|
|
b2Log(" jd.enableMotor = bool(%d);\n", m_enableMotor);
|
||
|
|
b2Log(" jd.motorSpeed = %.15lef;\n", m_motorSpeed);
|
||
|
|
b2Log(" jd.maxMotorTorque = %.15lef;\n", m_maxMotorTorque);
|
||
|
|
b2Log(" joints[%d] = m_world->CreateJoint(&jd);\n", m_index);
|
||
|
|
}
|