NAME
Box2D::b2Shape - Used for collision detection.
SYNOPSIS
# Don't use this class directly, use a subclass.DESCRIPTION
A shape is used for collision detection. You can create a shape however you like. Shapes used for simulation in Box2D::b2World are created automatically when a Box2D::b2Fixture is created.
METHODS
ComputeAABB( $aabb, $xf )
Given a transform, compute the associated axis aligned bounding box for this shape.
Parameters:
Box2D::b2AABB$aabb- returns the axis aligned box.Box2D::b2Transform$xf- the world transform of the shape.
Implemented in Box2D::b2CircleShape, and Box2D::b2PolygonShape.
ComputeMass( $massData, $density )
Compute the mass properties of this shape using its dimensions and density. The inertia tensor is computed about the local origin.
Parameters:
Box2D::b2MassData$massData- returns the mass data for this shape.float32$density- the density in kilograms per meter squared.
Implemented in Box2D::b2CircleShape, and Box2D::b2PolygonShape.
GetType()
Get the type of this shape. You can use this to down cast to the concrete shape.
Parameters:
Returns a int
RayCast( $output, $input, $transform )
Cast a ray against this shape.
Parameters:
Box2D::b2RayCastOutput$output- the ray-cast results.Box2D::b2RayCastInput$input- the ray-cast input parameters.Box2D::b2Transform$transform- the transform to be applied to the shape.
Returns a bool
Implemented in Box2D::b2CircleShape, and Box2D::b2PolygonShape.
TestPoint( $xf, $p )
Test a point for containment in this shape. This only works for convex shapes.
Parameters:
Box2D::b2Transform$xf- the shape world transform.Box2D::b2Vec2$p- a point in world coordinates.
Returns a bool
Implemented in Box2D::b2CircleShape, and Box2D::b2PolygonShape.
m_radius()
m_radius( $m_radius )
Parameters:
float32$m_radius(optional)
Returns a float32
m_type()
m_type( $m_type )
Parameters:
int$m_type(optional)
Returns a int
SEE ALSO
BUGS
See "BUGS" in Box2D