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#include "UnityPrefix.h"
#if ENABLE_2D_PHYSICS || DOXYGEN
#include "Runtime/Physics2D/DistanceJoint2D.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 (DistanceJoint2D)
IMPLEMENT_OBJECT_SERIALIZE (DistanceJoint2D)
// --------------------------------------------------------------------------
DistanceJoint2D::DistanceJoint2D (MemLabelId label, ObjectCreationMode mode)
: Super(label, mode)
{
}
DistanceJoint2D::~DistanceJoint2D ()
{
}
template<class TransferFunction>
void DistanceJoint2D::Transfer (TransferFunction& transfer)
{
Super::Transfer(transfer);
TRANSFER (m_Anchor);
TRANSFER (m_ConnectedAnchor);
TRANSFER (m_Distance);
}
void DistanceJoint2D::CheckConsistency ()
{
Super::CheckConsistency ();
m_Distance = clamp<float> (m_Distance, b2_linearSlop, PHYSICS_2D_LARGE_RANGE_CLAMP);
if (!IsFinite(m_Anchor))
m_Anchor = Vector2f::zero;
if (!IsFinite(m_ConnectedAnchor))
m_ConnectedAnchor = Vector2f::zero;
}
void DistanceJoint2D::Reset ()
{
Super::Reset ();
m_Distance = 1.0f;
m_Anchor = Vector2f::zero;
m_ConnectedAnchor = Vector2f::zero;
}
void DistanceJoint2D::SetAnchor (const Vector2f& anchor)
{
ABORT_INVALID_VECTOR2 (anchor, anchor, DistanceJoint2D);
m_Anchor = anchor;
SetDirty();
// Recreate the joint.
if (m_Joint != NULL)
ReCreate();
}
void DistanceJoint2D::SetConnectedAnchor (const Vector2f& anchor)
{
ABORT_INVALID_VECTOR2 (anchor, connectedAnchor, DistanceJoint2D);
m_ConnectedAnchor = anchor;
SetDirty();
// Recreate the joint.
if (m_Joint != NULL)
ReCreate();
}
void DistanceJoint2D::SetDistance (float distance)
{
ABORT_INVALID_FLOAT (distance, distance, DistanceJoint2D);
m_Distance = clamp<float> (distance, b2_linearSlop, PHYSICS_2D_LARGE_RANGE_CLAMP);
SetDirty();
if (m_Joint != NULL)
((b2RopeJoint*)m_Joint)->SetMaxLength (m_Distance);
}
// --------------------------------------------------------------------------
void DistanceJoint2D::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.
b2RopeJointDef jointDef;
jointDef.maxLength = 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);
}
void DistanceJoint2D::AutoCalculateDistance ()
{
// Reset to default.
m_Distance = 1.0f;
if (m_ConnectedRigidBody.IsNull ())
return;
// Find the appropriate rigid body A.
Rigidbody2D* rigidBodyA = QueryComponent(Rigidbody2D);
Assert (rigidBodyA != NULL);
// Find the appropriate rigid body B.
Rigidbody2D* rigidBodyB = m_ConnectedRigidBody;
Transform* transformA = QueryComponent (Transform);
Vector3f pointA = transformA->TransformPoint(Vector3f(m_Anchor.x, m_Anchor.y, 0.0f));
if (rigidBodyB == NULL)
{
m_Distance = Magnitude(Vector2f(pointA.x, pointA.y));
return;
}
Transform* transformB = rigidBodyB->GetGameObjectPtr ()->QueryComponent (Transform);
Vector3f pointB = transformB->TransformPoint(Vector3f(m_ConnectedAnchor.x, m_ConnectedAnchor.y, 0.0f));
m_Distance = Magnitude(Vector2f(pointA.x-pointB.x, pointA.y-pointB.y));
}
#endif //ENABLE_2D_PHYSICS
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