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#include "UnityPrefix.h"
#if ENABLE_2D_PHYSICS || DOXYGEN
#include "Runtime/Physics2D/SpringJoint2D.h"
#include "Runtime/Physics2D/RigidBody2D.h"
#include "Runtime/Graphics/Transform.h"
#include "Runtime/Serialize/TransferFunctions/SerializeTransfer.h"
#include "Runtime/Utilities/ValidateArgs.h"
#include "External/Box2D/Box2D/Box2D.h"
IMPLEMENT_CLASS (SpringJoint2D)
IMPLEMENT_OBJECT_SERIALIZE (SpringJoint2D)
// --------------------------------------------------------------------------
SpringJoint2D::SpringJoint2D (MemLabelId label, ObjectCreationMode mode)
: Super(label, mode)
{
}
SpringJoint2D::~SpringJoint2D ()
{
}
template<class TransferFunction>
void SpringJoint2D::Transfer (TransferFunction& transfer)
{
Super::Transfer(transfer);
TRANSFER (m_Anchor);
TRANSFER (m_ConnectedAnchor);
TRANSFER (m_Distance);
TRANSFER (m_DampingRatio);
TRANSFER (m_Frequency);
}
void SpringJoint2D::CheckConsistency ()
{
Super::CheckConsistency ();
m_Distance = clamp<float> (m_Distance, b2_linearSlop, PHYSICS_2D_LARGE_RANGE_CLAMP);
m_Frequency = clamp<float> (m_Frequency, 0.0f, PHYSICS_2D_LARGE_RANGE_CLAMP);
m_DampingRatio = clamp(m_DampingRatio, 0.0f, 1.0f);
if (!IsFinite(m_Anchor))
m_Anchor = Vector2f::zero;
if (!IsFinite(m_ConnectedAnchor))
m_ConnectedAnchor = Vector2f::zero;
}
void SpringJoint2D::Reset ()
{
Super::Reset ();
m_Distance = 1.0f;
m_DampingRatio = 0.0f;
m_Frequency = 10.0f;
m_Anchor = Vector2f::zero;
m_ConnectedAnchor = Vector2f::zero;
}
void SpringJoint2D::SetAnchor (const Vector2f& anchor)
{
ABORT_INVALID_VECTOR2 (anchor, anchor, SpringJoint2D);
m_Anchor = anchor;
SetDirty();
// Recreate the joint.
if (m_Joint != NULL)
ReCreate();
}
void SpringJoint2D::SetConnectedAnchor (const Vector2f& anchor)
{
ABORT_INVALID_VECTOR2 (anchor, connectedAnchor, SpringJoint2D);
m_ConnectedAnchor = anchor;
SetDirty();
// Recreate the joint.
if (m_Joint != NULL)
ReCreate();
}
void SpringJoint2D::SetDistance (float distance)
{
ABORT_INVALID_FLOAT (distance, distance, SpringJoint2D);
m_Distance = clamp<float> (distance, b2_linearSlop, PHYSICS_2D_LARGE_RANGE_CLAMP);
SetDirty();
if (m_Joint != NULL)
((b2DistanceJoint*)m_Joint)->SetLength (m_Distance);
}
void SpringJoint2D::SetDampingRatio (float ratio)
{
ABORT_INVALID_FLOAT (ratio, dampingRatio, SpringJoint2D);
m_DampingRatio = clamp(ratio, 0.0f, 1.0f);
SetDirty();
if (m_Joint != NULL)
((b2DistanceJoint*)m_Joint)->SetDampingRatio (m_DampingRatio);
}
void SpringJoint2D::SetFrequency (float frequency)
{
ABORT_INVALID_FLOAT (frequency, frequency, SpringJoint2D);
m_Frequency = clamp<float> (frequency, 0.0f, PHYSICS_2D_LARGE_RANGE_CLAMP);
SetDirty();
if (m_Joint != NULL)
((b2DistanceJoint*)m_Joint)->SetFrequency (m_Frequency);
}
// --------------------------------------------------------------------------
void SpringJoint2D::Create ()
{
Assert (m_Joint == NULL);
if (!IsActive ())
return;
// Fetch transform scales.
const Vector3f scale = GetComponent (Transform).GetWorldScaleLossy ();
const Vector3f connectedScale = m_ConnectedRigidBody.IsNull () ? Vector3f::one : m_ConnectedRigidBody->GetComponent (Transform).GetWorldScaleLossy ();
// Configure the joint definition.
b2DistanceJointDef jointDef;
jointDef.dampingRatio = m_DampingRatio;
jointDef.frequencyHz = m_Frequency;
jointDef.length = m_Distance;
jointDef.localAnchorA.Set (m_Anchor.x * scale.x, m_Anchor.y * scale.y);
jointDef.localAnchorB.Set (m_ConnectedAnchor.x * connectedScale.x, m_ConnectedAnchor.y * connectedScale.y);
// Create the joint.
FinalizeCreateJoint (&jointDef);
}
#endif //ENABLE_2D_PHYSICS
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