73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
/*
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* Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
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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 "b2TensorDampingController.h"
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b2TensorDampingController::b2TensorDampingController(const b2TensorDampingControllerDef* def) : b2Controller(def)
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{
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T = def->T;
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maxTimestep = def->maxTimestep;
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}
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void b2TensorDampingController::Step(const b2TimeStep& step)
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{
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float32 timestep = step.dt;
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if(timestep<=B2_FLT_EPSILON)
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return;
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if(timestep>maxTimestep && maxTimestep>0)
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timestep = maxTimestep;
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for(b2ControllerEdge *i=m_bodyList;i;i=i->nextBody){
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b2Body* body = i->body;
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if(body->IsSleeping())
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continue;
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b2Vec2 damping = body->GetWorldVector(
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b2Mul(T,
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body->GetLocalVector(
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body->GetLinearVelocity()
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)
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)
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);
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body->SetLinearVelocity(body->GetLinearVelocity() + timestep * damping);
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}
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}
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void b2TensorDampingControllerDef::SetAxisAligned(float32 xDamping, float32 yDamping)
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{
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T.col1.x = -xDamping;
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T.col1.y = 0;
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T.col2.x = 0;
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T.col2.y = -yDamping;
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if(xDamping>0 || yDamping>0){
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maxTimestep = 1/b2Max(xDamping,yDamping);
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}else{
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maxTimestep = 0;
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}
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}
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void b2TensorDampingController::Destroy(b2BlockAllocator* allocator)
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{
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allocator->Free(this, sizeof(b2TensorDampingController));
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}
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b2TensorDampingController* b2TensorDampingControllerDef::Create(b2BlockAllocator* allocator) const
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{
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void* mem = allocator->Allocate(sizeof(b2TensorDampingController));
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return new (mem) b2TensorDampingController(this);
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}
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