Class Fixture

java.lang.Object
org.jbox2d.dynamics.Fixture
public class Fixture extends java.lang.Object
A fixture is used to attach a shape to a body for collision detection. A fixture inherits its transform from its parent. Fixtures hold additional non-geometric data such as friction, collision filters, etc. Fixtures are created via Body::CreateFixture.

  • Field Details

    • m_density

      public float m_density

    • m_next

      public Fixture m_next

    • m_body

      public Body m_body

    • m_shape

      public Shape m_shape

    • m_friction

      public float m_friction

    • m_restitution

      public float m_restitution

    • m_proxies

      public FixtureProxy[] m_proxies

    • m_proxyCount

      public int m_proxyCount

    • m_filter

      public final Filter m_filter

    • m_isSensor

      public boolean m_isSensor

    • m_userData

      public java.lang.Object m_userData

    • pool1

      private final AABB pool1

    • pool2

      private final AABB pool2

    • displacement

      private final Vec2 displacement

  • Constructor Details

    • Fixture

      public Fixture()

  • Method Details

    • getType

      public ShapeType getType()
      Get the type of the child shape. You can use this to down cast to the concrete shape.
      Returns:
      the shape type.

    • getShape

      public Shape getShape()
      Get the child shape. You can modify the child shape, however you should not change the number of vertices because this will crash some collision caching mechanisms.
      Returns:

    • isSensor

      public boolean isSensor()
      Is this fixture a sensor (non-solid)?
      Returns:
      the true if the shape is a sensor.

    • setSensor

      public void setSensor(boolean sensor)
      Set if this fixture is a sensor.
      Parameters:
      sensor -

    • setFilterData

      public void setFilterData(Filter filter)
      Set the contact filtering data. This is an expensive operation and should not be called frequently. This will not update contacts until the next time step when either parent body is awake. This automatically calls refilter.
      Parameters:
      filter -

    • getFilterData

      public Filter getFilterData()
      Get the contact filtering data.
      Returns:

    • refilter

      public void refilter()
      Call this if you want to establish collision that was previously disabled by ContactFilter::ShouldCollide.

    • getBody

      public Body getBody()
      Get the parent body of this fixture. This is NULL if the fixture is not attached.
      Returns:
      the parent body.

    • getNext

      public Fixture getNext()
      Get the next fixture in the parent body's fixture list.
      Returns:
      the next shape.

    • setDensity

      public void setDensity(float density)

    • getDensity

      public float getDensity()

    • getUserData

      public java.lang.Object getUserData()
      Get the user data that was assigned in the fixture definition. Use this to store your application specific data.
      Returns:

    • setUserData

      public void setUserData(java.lang.Object data)
      Set the user data. Use this to store your application specific data.
      Parameters:
      data -

    • testPoint

      public boolean testPoint(Vec2 p)
      Test a point for containment in this fixture. This only works for convex shapes.
      Parameters:
      p - a point in world coordinates.
      Returns:

    • raycast

      public boolean raycast(RayCastOutput output, RayCastInput input, int childIndex)
      Cast a ray against this shape.
      Parameters:
      output - the ray-cast results.
      input - the ray-cast input parameters.
      output -
      input -

    • getMassData

      public void getMassData(MassData massData)
      Get the mass data for this fixture. The mass data is based on the density and the shape. The rotational inertia is about the shape's origin.

    • getFriction

      public float getFriction()
      Get the coefficient of friction.
      Returns:

    • setFriction

      public void setFriction(float friction)
      Set the coefficient of friction. This will _not_ change the friction of existing contacts.
      Parameters:
      friction -

    • getRestitution

      public float getRestitution()
      Get the coefficient of restitution.
      Returns:

    • setRestitution

      public void setRestitution(float restitution)
      Set the coefficient of restitution. This will _not_ change the restitution of existing contacts.
      Parameters:
      restitution -

    • getAABB

      public AABB getAABB(int childIndex)
      Get the fixture's AABB. This AABB may be enlarge and/or stale. If you need a more accurate AABB, compute it using the shape and the body transform.
      Returns:

    • dump

      public void dump(int bodyIndex)
      Dump this fixture to the log file.
      Parameters:
      bodyIndex -

    • create

      public void create(Body body, FixtureDef def)

    • destroy

      public void destroy()

    • createProxies

      public void createProxies(BroadPhase broadPhase, Transform xf)

    • destroyProxies

      public void destroyProxies(BroadPhase broadPhase)
      Internal method
      Parameters:
      broadPhase -

    • synchronize

      protected void synchronize(BroadPhase broadPhase, Transform transform1, Transform transform2)
      Internal method
      Parameters:
      broadPhase -
      xf1 -
      xf2 -