ompl::base::MobiusStateSpace Class Reference

The Mobius strip is a 2-dimensional non-orientable surface. More...

#include <ompl/base/spaces/special/MobiusStateSpace.h>

Inheritance diagram for ompl::base::MobiusStateSpace:

## Classes

class  StateType
The definition of a state (u,v) in the Mobius strip state space. The variable u is the position on the center circle in the interval [-Pi, Pi] The variable v is the position along the width in the interval [-intervalMax, intervalMax]. More...

## Public Member Functions

virtual double distance (const State *state1, const State *state2) const override
Computes distance between two states. This function satisfies the properties of a metric if isMetricSpace() is true, and its return value will always be between 0 and getMaximumExtent()

virtual void interpolate (const State *from, const State *to, double t, State *state) const override
Computes the state that lies at time t in [0, 1] on the segment that connects from state to to state. The memory location of state is not required to be different from the memory of either from or to.

virtual StateallocState () const override
Allocate a state that can store a point in the described space.

Eigen::Vector3f toVector (const State *state) const

Public Member Functions inherited from ompl::base::CompoundStateSpace
CompoundStateSpace ()
Construct an empty compound state space.

CompoundStateSpace (const std::vector< StateSpacePtr > &components, const std::vector< double > &weights)
Construct a compound state space from a list of subspaces (components) and their corresponding weights (weights)

template<class T >
T * as (const unsigned int index) const
Cast a component of this instance to a desired type. More...

template<class T >
T * as (const std::string &name) const
Cast a component of this instance to a desired type. More...

bool isCompound () const override
Check if the state space is compound.

bool isHybrid () const override
Check if this is a hybrid state space (i.e., both discrete and continuous components exist)

void printState (const State *state, std::ostream &out) const override
Print a state to a stream.

void printSettings (std::ostream &out) const override
Print the settings for this state space to a stream.

void computeLocations () override
Compute the location information for various components of the state space. Either this function or setup() must be called before any calls to getValueAddressAtName(), getValueAddressAtLocation() (and other functions where those are used).

void setup () override
Perform final setup steps. This function is automatically called by the SpaceInformation. If any default projections are to be registered, this call will set them and call their setup() functions. It is safe to call this function multiple times. At a subsequent call, projections that have been previously user configured are not re-instantiated, but their setup() method is still called.

void addSubspace (const StateSpacePtr &component, double weight)
Adds a new state space as part of the compound state space. For computing distances within the compound state space, the weight of the component also needs to be specified.

unsigned int getSubspaceCount () const
Get the number of state spaces that make up the compound state space.

const StateSpacePtrgetSubspace (unsigned int index) const
Get a specific subspace from the compound state space.

const StateSpacePtrgetSubspace (const std::string &name) const
Get a specific subspace from the compound state space.

unsigned int getSubspaceIndex (const std::string &name) const
Get the index of a specific subspace from the compound state space.

bool hasSubspace (const std::string &name) const
Check if a specific subspace is contained in this state space.

double getSubspaceWeight (unsigned int index) const
Get the weight of a subspace from the compound state space (used in distance computation)

double getSubspaceWeight (const std::string &name) const
Get the weight of a subspace from the compound state space (used in distance computation)

void setSubspaceWeight (unsigned int index, double weight)
Set the weight of a subspace in the compound state space (used in distance computation)

void setSubspaceWeight (const std::string &name, double weight)
Set the weight of a subspace in the compound state space (used in distance computation)

const std::vector< StateSpacePtr > & getSubspaces () const
Get the list of components.

const std::vector< double > & getSubspaceWeights () const
Get the list of component weights.

bool isLocked () const
Return true if the state space is locked. A value of true means that no further spaces can be added as components.

void lock ()
Lock this state space. This means no further spaces can be added as components. This function can be for instance called from the constructor of a state space that inherits from CompoundStateSpace to prevent the user to add further components.

StateSamplerPtr allocSubspaceStateSampler (const StateSpace *subspace) const override
Allocate a sampler that actually samples only components that are part of subspace.

unsigned int getDimension () const override
Get the dimension of the space (not the dimension of the surrounding ambient space)

double getMaximumExtent () const override
Get the maximum value a call to distance() can return (or an upper bound). For unbounded state spaces, this function can return infinity. More...

double getMeasure () const override
Get a measure of the space (this can be thought of as a generalization of volume)

void enforceBounds (State *state) const override
Bring the state within the bounds of the state space. For unbounded spaces this function can be a no-op.

bool satisfiesBounds (const State *state) const override
Check if a state is inside the bounding box. For unbounded spaces this function can always return true.

void copyState (State *destination, const State *source) const override
Copy a state to another. The memory of source and destination should NOT overlap. More...

unsigned int getSerializationLength () const override
Get the number of chars in the serialization of a state in this space.

void serialize (void *serialization, const State *state) const override
Write the binary representation of state to serialization.

void deserialize (State *state, const void *serialization) const override
Read the binary representation of a state from serialization and write it to state.

double distance (const State *state1, const State *state2) const override
Computes distance between two states. This function satisfies the properties of a metric if isMetricSpace() is true, and its return value will always be between 0 and getMaximumExtent()

void setLongestValidSegmentFraction (double segmentFraction) override
When performing discrete validation of motions, the length of the longest segment that does not require state validation needs to be specified. This function sets this length as a fraction of the space's maximum extent. The call is passed to all contained subspaces.

unsigned int validSegmentCount (const State *state1, const State *state2) const override
Count how many segments of the "longest valid length" fit on the motion from state1 to state2. This is the max() of the counts returned by contained subspaces.

bool equalStates (const State *state1, const State *state2) const override
Checks whether two states are equal.

void interpolate (const State *from, const State *to, double t, State *state) const override
Computes the state that lies at time t in [0, 1] on the segment that connects from state to to state. The memory location of state is not required to be different from the memory of either from or to.

StateSamplerPtr allocDefaultStateSampler () const override
Allocate an instance of the default uniform state sampler for this space.

StateallocState () const override
Allocate a state that can store a point in the described space.

void freeState (State *state) const override
Free the memory of the allocated state.

double * getValueAddressAtIndex (State *state, unsigned int index) const override
Many states contain a number of double values. This function provides a means to get the memory address of a double value from state state located at position index. The first double value is returned for index = 0. If index is too large (does not point to any double values in the state), the return value is nullptr. More...

Public Member Functions inherited from ompl::base::StateSpace
StateSpace (const StateSpace &)=delete

StateSpaceoperator= (const StateSpace &)=delete

StateSpace ()
Constructor. Assigns a unique name to the space.

template<class T >
T * as ()
Cast this instance to a desired type. More...

template<class T >
const T * as () const
Cast this instance to a desired type. More...

virtual bool isDiscrete () const
Check if the set of states is discrete. More...

virtual bool isMetricSpace () const
Return true if the distance function associated with the space is a metric.

virtual bool hasSymmetricDistance () const
Check if the distance function on this state space is symmetric, i.e. distance(s1,s2) = distance(s2,s1). Default implementation returns true.

virtual bool hasSymmetricInterpolate () const
Check if the interpolation function on this state space is symmetric, i.e. interpolate(from, to, t, state) = interpolate(to, from, 1-t, state). Default implementation returns true.

const std::string & getName () const
Get the name of the state space.

void setName (const std::string &name)
Set the name of the state space.

int getType () const
Get the type of the state space. The type can be used to verify whether two space instances are of the same type (e.g., SO2)

bool includes (const StateSpacePtr &other) const
Return true if other is a space included (perhaps equal, perhaps a subspace) in this one.

bool includes (const StateSpace *other) const
Return true if other is a space included (perhaps equal, perhaps a subspace) in this one.

bool covers (const StateSpacePtr &other) const
Return true if other is a space that is either included (perhaps equal, perhaps a subspace) in this one, or all of its subspaces are included in this one.

bool covers (const StateSpace *other) const
Return true if other is a space that is either included (perhaps equal, perhaps a subspace) in this one, or all of its subspaces are included in this one.

ParamSetparams ()
Get the parameters for this space.

const ParamSetparams () const
Get the parameters for this space.

virtual double getLongestValidSegmentFraction () const
When performing discrete validation of motions, the length of the longest segment that does not require state validation needs to be specified. This function returns this length, for this state space, as a fraction of the space's maximum extent.

virtual void setValidSegmentCountFactor (unsigned int factor)
Set factor to be the value to multiply the return value of validSegmentCount(). By default, this value is 1. The higher the value, the smaller the size of the segments considered valid. The effect of this function is immediate (setup() does not need to be called).

virtual unsigned int getValidSegmentCountFactor () const
Get the value used to multiply the return value of validSegmentCount().

virtual double getLongestValidSegmentLength () const
Get the longest valid segment at the time setup() was called.

virtual void computeSignature (std::vector< int > &signature) const
Compute an array of ints that uniquely identifies the structure of the state space. The first element of the signature is the number of integers that follow.

StatecloneState (const State *source) const
Clone a state.

virtual StateSamplerPtr allocStateSampler () const
Allocate an instance of the state sampler for this space. This sampler will be allocated with the sampler allocator that was previously specified by setStateSamplerAllocator() or, if no sampler allocator was specified, allocDefaultStateSampler() is called.

void setStateSamplerAllocator (const StateSamplerAllocator &ssa)
Set the sampler allocator to use.

void clearStateSamplerAllocator ()
Clear the state sampler allocator (reset to default)

const double * getValueAddressAtIndex (const State *state, unsigned int index) const
Const variant of the same function as above;.

const std::vector< ValueLocation > & getValueLocations () const
Get the locations of values of type double contained in a state from this space. The order of the values is consistent with getValueAddressAtIndex(). The setup() function must have been previously called.

const std::map< std::string, ValueLocation > & getValueLocationsByName () const
Get the named locations of values of type double contained in a state from this space. The setup() function must have been previously called.

double * getValueAddressAtLocation (State *state, const ValueLocation &loc) const
Get a pointer to the double value in state that loc points to.

const double * getValueAddressAtLocation (const State *state, const ValueLocation &loc) const
Const variant of the same function as above;.

double * getValueAddressAtName (State *state, const std::string &name) const
Get a pointer to the double value in state that name points to.

const double * getValueAddressAtName (const State *state, const std::string &name) const
Const variant of the same function as above;.

virtual void copyToReals (std::vector< double > &reals, const State *source) const
Copy all the real values from a state source to the array reals using getValueAddressAtLocation()

virtual void copyFromReals (State *destination, const std::vector< double > &reals) const
Copy the values from reals to the state destination using getValueAddressAtLocation()

void registerProjection (const std::string &name, const ProjectionEvaluatorPtr &projection)
Register a projection for this state space under a specified name.

void registerDefaultProjection (const ProjectionEvaluatorPtr &projection)
Register the default projection for this state space.

virtual void registerProjections ()
Register the projections for this state space. Usually, this is at least the default projection. These are implicit projections, set by the implementation of the state space. This is called by setup().

ProjectionEvaluatorPtr getProjection (const std::string &name) const
Get the projection registered under a specific name.

ProjectionEvaluatorPtr getDefaultProjection () const
Get the default projection.

bool hasProjection (const std::string &name) const
Check if a projection with a specified name is available.

bool hasDefaultProjection () const
Check if a default projection is available.

const std::map< std::string, ProjectionEvaluatorPtr > & getRegisteredProjections () const
Get all the registered projections.

StateSamplerPtr allocSubspaceStateSampler (const StateSpacePtr &subspace) const
Allocate a sampler that actually samples only components that are part of subspace.

StategetSubstateAtLocation (State *state, const SubstateLocation &loc) const
Get the substate of state that is pointed to by loc.

const StategetSubstateAtLocation (const State *state, const SubstateLocation &loc) const
Get the substate of state that is pointed to by loc.

const std::map< std::string, SubstateLocation > & getSubstateLocationsByName () const
Get the list of known substate locations (keys of the map corrspond to names of subspaces)

void getCommonSubspaces (const StateSpacePtr &other, std::vector< std::string > &subspaces) const
Get the set of subspaces that this space and other have in common. The computed list of subspaces does not contain spaces that cover each other, even though they may be common, as that is redundant information.

void getCommonSubspaces (const StateSpace *other, std::vector< std::string > &subspaces) const
Get the set of subspaces that this space and other have in common. The computed list of subspaces does not contain spaces that cover each other, even though they may be common, as that is redundant information.

virtual void printProjections (std::ostream &out) const
Print the list of registered projections. This function is also called by printSettings()

virtual void sanityChecks (double zero, double eps, unsigned int flags) const
Perform sanity checks for this state space. Throws an exception if failures are found. More...

virtual void sanityChecks () const
Convenience function that allows derived state spaces to choose which checks should pass (see SanityChecks flags) and how strict the checks are. This just calls sanityChecks() with some default arguments.

void diagram (std::ostream &out) const
Print a Graphviz digraph that represents the containment diagram for the state space.

void list (std::ostream &out) const
Print the list of all contained state space instances.

Public Types inherited from ompl::base::CompoundStateSpace
using StateType = ompl::base::CompoundState
Define the type of state allocated by this state space.

Public Types inherited from ompl::base::StateSpace
enum  SanityChecks {
STATESPACE_DISTANCE_DIFFERENT_STATES = (1 << 1), STATESPACE_DISTANCE_SYMMETRIC = (1 << 2), STATESPACE_INTERPOLATION = (1 << 3), STATESPACE_TRIANGLE_INEQUALITY = (1 << 4),
STATESPACE_DISTANCE_BOUND = (1 << 5), STATESPACE_RESPECT_BOUNDS = (1 << 6), STATESPACE_ENFORCE_BOUNDS_NO_OP = (1 << 7), STATESPACE_SERIALIZATION = (1 << 8)
}
Flags to use in a bit mask for state space sanity checks. Some basic checks do not have flags associated (they are always executed; for example, whether copyState() works as expected) More...

using StateType = ompl::base::State
Define the type of state allocated by this space.

Static Public Member Functions inherited from ompl::base::StateSpace
static void Diagram (std::ostream &out)
Print a Graphviz digraph that represents the containment diagram for all the instantiated state spaces.

static void List (std::ostream &out)
Print the list of available state space instances.

Protected Member Functions inherited from ompl::base::CompoundStateSpace
void allocStateComponents (CompoundState *state) const
Allocate the state components. Called by allocState(). Usually called by derived state spaces.

Protected Attributes inherited from ompl::base::CompoundStateSpace
std::vector< StateSpacePtrcomponents_
The state spaces that make up the compound state space.

unsigned int componentCount_ {0u}
The number of components.

std::vector< double > weights_
The weight assigned to each component of the state space when computing the compound distance.

double weightSum_ {0.0}
The sum of all the weights in weights_.

bool locked_ {false}
Flag indicating whether adding further components is allowed or not.

Protected Attributes inherited from ompl::base::StateSpace
int type_
A type assigned for this state space.

StateSamplerAllocator ssa_
An optional state sampler allocator.

double maxExtent_
The extent of this space at the time setup() was called.

double longestValidSegmentFraction_
The fraction of the longest valid segment.

double longestValidSegment_
The longest valid segment at the time setup() was called.

unsigned int longestValidSegmentCountFactor_
The factor to multiply the value returned by validSegmentCount(). Rarely used but useful for things like doubling the resolution.

std::map< std::string, ProjectionEvaluatorPtrprojections_
List of available projections.

ParamSet params_
The set of parameters for this space.

std::vector< ValueLocationvalueLocationsInOrder_
The value locations for all varliables of type double contained in a state; The locations point to values in the same order as that returned by getValueAddressAtIndex()

std::map< std::string, ValueLocationvalueLocationsByName_
All the known value locations, by name. The names of state spaces access the first element of a state. RealVectorStateSpace dimensions are used to access individual dimensions.

std::map< std::string, SubstateLocationsubstateLocationsByName_
All the known substat locations, by name.

Static Protected Attributes inherited from ompl::base::StateSpace
static const std::string DEFAULT_PROJECTION_NAME = ""
The name used for the default projection.

## Detailed Description

The Mobius strip is a 2-dimensional non-orientable surface.

Definition at line 120 of file MobiusStateSpace.h.

The documentation for this class was generated from the following files: