org.jbox2d.collision.shapes
Class Shape

java.lang.Object
  extended by org.jbox2d.collision.shapes.Shape
Direct Known Subclasses:
CircleShape, PolygonShape

public abstract class Shape
extends Object

A shape is used for collision detection. You can create a shape however you like. Shapes used for simulation in World are created automatically when a Fixture is created. Shapes may encapsulate a one or more child shapes.


Field Summary
 float m_radius
           
 ShapeType m_type
           
 
Constructor Summary
Shape()
           
 
Method Summary
abstract  Shape clone()
           
abstract  void computeAABB(AABB argAabb, Transform argXf)
          Given a transform, compute the associated axis aligned bounding box for a child shape.
abstract  void computeMass(MassData massData, float density)
          Compute the mass properties of this shape using its dimensions and density.
 ShapeType getType()
          Get the type of this shape.
abstract  boolean raycast(RayCastOutput argOutput, RayCastInput argInput, Transform argTransform)
          Cast a ray against a child shape.
abstract  boolean testPoint(Transform xf, Vec2 p)
          Test a point for containment in this shape.
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

m_type

public ShapeType m_type

m_radius

public float m_radius
Constructor Detail

Shape

public Shape()
Method Detail

getType

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

Returns:
the shape type.

testPoint

public abstract boolean testPoint(Transform xf,
                                  Vec2 p)
Test a point for containment in this shape. This only works for convex shapes.

Parameters:
xf - the shape world transform.
p - a point in world coordinates.

raycast

public abstract boolean raycast(RayCastOutput argOutput,
                                RayCastInput argInput,
                                Transform argTransform)
Cast a ray against a child shape.

Parameters:
argOutput - the ray-cast results.
argInput - the ray-cast input parameters.
argTransform - the transform to be applied to the shape.
argChildIndex - the child shape index
Returns:
if hit

computeAABB

public abstract void computeAABB(AABB argAabb,
                                 Transform argXf)
Given a transform, compute the associated axis aligned bounding box for a child shape.

Parameters:
argAabb - returns the axis aligned box.
argXf - the world transform of the shape.

computeMass

public abstract void computeMass(MassData massData,
                                 float density)
Compute the mass properties of this shape using its dimensions and density. The inertia tensor is computed about the local origin.

Parameters:
massData - returns the mass data for this shape.
density - the density in kilograms per meter squared.

clone

public abstract Shape clone()
Overrides:
clone in class Object


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