b2Joint.cpp
上传用户:gb3593
上传日期:2022-01-07
资源大小:3028k
文件大小:5k
- /*
- * Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
- *
- * 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.
- */
- #include <Box2D/Dynamics/Joints/b2Joint.h>
- #include <Box2D/Dynamics/Joints/b2DistanceJoint.h>
- #include <Box2D/Dynamics/Joints/b2LineJoint.h>
- #include <Box2D/Dynamics/Joints/b2MouseJoint.h>
- #include <Box2D/Dynamics/Joints/b2RevoluteJoint.h>
- #include <Box2D/Dynamics/Joints/b2PrismaticJoint.h>
- #include <Box2D/Dynamics/Joints/b2PulleyJoint.h>
- #include <Box2D/Dynamics/Joints/b2GearJoint.h>
- #include <Box2D/Dynamics/Joints/b2WeldJoint.h>
- #include <Box2D/Dynamics/Joints/b2FrictionJoint.h>
- #include <Box2D/Dynamics/b2Body.h>
- #include <Box2D/Dynamics/b2World.h>
- #include <Box2D/Common/b2BlockAllocator.h>
- #include <new>
- b2Joint* b2Joint::Create(const b2JointDef* def, b2BlockAllocator* allocator)
- {
- b2Joint* joint = NULL;
- switch (def->type)
- {
- case e_distanceJoint:
- {
- void* mem = allocator->Allocate(sizeof(b2DistanceJoint));
- joint = new (mem) b2DistanceJoint((b2DistanceJointDef*)def);
- }
- break;
- case e_mouseJoint:
- {
- void* mem = allocator->Allocate(sizeof(b2MouseJoint));
- joint = new (mem) b2MouseJoint((b2MouseJointDef*)def);
- }
- break;
- case e_prismaticJoint:
- {
- void* mem = allocator->Allocate(sizeof(b2PrismaticJoint));
- joint = new (mem) b2PrismaticJoint((b2PrismaticJointDef*)def);
- }
- break;
- case e_revoluteJoint:
- {
- void* mem = allocator->Allocate(sizeof(b2RevoluteJoint));
- joint = new (mem) b2RevoluteJoint((b2RevoluteJointDef*)def);
- }
- break;
- case e_pulleyJoint:
- {
- void* mem = allocator->Allocate(sizeof(b2PulleyJoint));
- joint = new (mem) b2PulleyJoint((b2PulleyJointDef*)def);
- }
- break;
- case e_gearJoint:
- {
- void* mem = allocator->Allocate(sizeof(b2GearJoint));
- joint = new (mem) b2GearJoint((b2GearJointDef*)def);
- }
- break;
- case e_lineJoint:
- {
- void* mem = allocator->Allocate(sizeof(b2LineJoint));
- joint = new (mem) b2LineJoint((b2LineJointDef*)def);
- }
- break;
- case e_weldJoint:
- {
- void* mem = allocator->Allocate(sizeof(b2WeldJoint));
- joint = new (mem) b2WeldJoint((b2WeldJointDef*)def);
- }
- break;
-
- case e_frictionJoint:
- {
- void* mem = allocator->Allocate(sizeof(b2FrictionJoint));
- joint = new (mem) b2FrictionJoint((b2FrictionJointDef*)def);
- }
- break;
- default:
- b2Assert(false);
- break;
- }
- return joint;
- }
- void b2Joint::Destroy(b2Joint* joint, b2BlockAllocator* allocator)
- {
- joint->~b2Joint();
- switch (joint->m_type)
- {
- case e_distanceJoint:
- allocator->Free(joint, sizeof(b2DistanceJoint));
- break;
- case e_mouseJoint:
- allocator->Free(joint, sizeof(b2MouseJoint));
- break;
- case e_prismaticJoint:
- allocator->Free(joint, sizeof(b2PrismaticJoint));
- break;
- case e_revoluteJoint:
- allocator->Free(joint, sizeof(b2RevoluteJoint));
- break;
- case e_pulleyJoint:
- allocator->Free(joint, sizeof(b2PulleyJoint));
- break;
- case e_gearJoint:
- allocator->Free(joint, sizeof(b2GearJoint));
- break;
- case e_lineJoint:
- allocator->Free(joint, sizeof(b2LineJoint));
- break;
-
- case e_weldJoint:
- allocator->Free(joint, sizeof(b2WeldJoint));
- break;
- case e_frictionJoint:
- allocator->Free(joint, sizeof(b2FrictionJoint));
- break;
- default:
- b2Assert(false);
- break;
- }
- }
- b2Joint::b2Joint(const b2JointDef* def)
- {
- b2Assert(def->bodyA != def->bodyB);
- m_type = def->type;
- m_prev = NULL;
- m_next = NULL;
- m_bodyA = def->bodyA;
- m_bodyB = def->bodyB;
- m_collideConnected = def->collideConnected;
- m_islandFlag = false;
- m_userData = def->userData;
- m_edgeA.joint = NULL;
- m_edgeA.other = NULL;
- m_edgeA.prev = NULL;
- m_edgeA.next = NULL;
- m_edgeB.joint = NULL;
- m_edgeB.other = NULL;
- m_edgeB.prev = NULL;
- m_edgeB.next = NULL;
- }
- bool b2Joint::IsActive() const
- {
- return m_bodyA->IsActive() && m_bodyB->IsActive();
- }