ElevationAngleConstraint Class

An Access constraint that requires that the object at the other end of the ConstrainedLink be between a span of elevation angles as viewed from the ConstrainedLinkEnd.

Inheritance Hierarchy

SystemObject
  AGI.Foundation.InfrastructureDefinitionalObject
    AGI.Foundation.AccessAccessQuery
      AGI.Foundation.AccessAccessConstraint
        AGI.Foundation.AccessMinimumMaximumAccessConstraint
          AGI.Foundation.Access.ConstraintsElevationAngleConstraint

Namespace: AGI.Foundation.Access.Constraints
Assembly: AGI.Foundation.Platforms (in AGI.Foundation.Platforms.dll) Version: 24.3.420.0 (24.3.420.0)

Syntax

C++

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public class ElevationAngleConstraint : MinimumMaximumAccessConstraint, 
	ILinkConstraint

Public Class ElevationAngleConstraint
	Inherits MinimumMaximumAccessConstraint
	Implements ILinkConstraint

public ref class ElevationAngleConstraint : public MinimumMaximumAccessConstraint, 
	ILinkConstraint

type ElevationAngleConstraint =  
    class
        inherit MinimumMaximumAccessConstraint
        interface ILinkConstraint
    end

The ElevationAngleConstraint type exposes the following members.

Constructors

	Name	Description
	ElevationAngleConstraint	Initializes a new instance with default values.
	ElevationAngleConstraint(Double)	Initializes a new instance with the specified minimum value.
	ElevationAngleConstraint(CentralBody, Double)	Initializes a new instance with the specified central body and minimum value.
	ElevationAngleConstraint(Double, Double)	Initializes a new instance with the specified minimum value and maximum value.
	ElevationAngleConstraint(ElevationAngleConstraint, CopyContext)	Initializes a new instance as a copy of an existing instance.
	ElevationAngleConstraint(CentralBody, Double, Double)	Initializes a new instance with the specified central body, minimum value, and maximum value.
	ElevationAngleConstraint(IServiceProvider, LinkRole, Double)	Initializes a new instance with the specified constrained link, constrained link end, and minimum value.
	ElevationAngleConstraint(IServiceProvider, LinkRole, CentralBody, Double)	Initializes a new instance with the specified constrained link, constrained link end, central body, and minimum value.
	ElevationAngleConstraint(IServiceProvider, LinkRole, CentralBody, Double, Double)	Initializes a new instance with the specified constrained link, constrained link end, central body, minimum value, and maximum value.

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Properties

	Name	Description
	Applicability	Gets or sets the Access situation in which this constraint applies. (Inherited from AccessConstraint.)
	CentralBody	Gets or sets the central body relative to which the elevation is computed.
	ConstrainedLink	Gets or sets the link to which this constraint applies. It is not necessary to set this property when using this constraint with AccessComputation.
	ConstrainedLinkEnd	Gets or sets the end of the link to which this constraint applies. This is the end that is observing the elevation angle which is constrained by this constraint. It is not necessary to set this property when using this constraint with AccessComputation.
	DebuggingLogger	Gets or sets a logger to which debugging information will be written. (Inherited from AccessQuery.)
	EvaluationOrder	Gets or sets a number indicating the evaluation order of this constraint relative to other constraints. All constraints involved in an AccessComputation or that share a common parent (e.g. AccessQueryAnd or AccessQueryOr) in an AccessQuery are sorted by this value before being evaluated in ascending order, so constraints with a lower evaluation order are evaluated earlier than constraints with a higher evaluation order. (Inherited from AccessConstraint.)
	IsFrozen	Gets a value indicating whether this object is frozen. A frozen object cannot be modified and an ObjectFrozenException will be thrown if an attempt is made to do so. (Inherited from DefinitionalObject.)
	IsMaximumEnabled	Gets or sets a value indicating whether a maximum threshold is used in calculating constraint satisfaction. (Inherited from MinimumMaximumAccessConstraint.)
	IsMinimumEnabled	Gets or sets a value indicating whether a minimum threshold is used in calculating constraint satisfaction. (Inherited from MinimumMaximumAccessConstraint.)
	MaximumTolerance	Gets or sets the tolerance associated with the MaximumValue to be used when computing threshold crossings. (Inherited from MinimumMaximumAccessConstraint.)
	MaximumValue	Gets or sets the maximum function value that is allowed for this constraint to be satisfied. By default this is PositiveInfinity. (Inherited from MinimumMaximumAccessConstraint.)
	MinimumTolerance	Gets or sets the tolerance associated with the MinimumValue to be used when computing threshold crossings. (Inherited from MinimumMaximumAccessConstraint.)
	MinimumValue	Gets or sets the minimum function value that is required for this constraint to be satisfied. By default, this is NegativeInfinity. (Inherited from MinimumMaximumAccessConstraint.)
	Sampling	Gets an instance describing how this constraint is to be sampled. (Inherited from AccessConstraint.)

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Methods

	Name	Description
	BuildQueryEvaluator	Builds a query evaluator from this constraint. (Overrides AccessConstraintBuildQueryEvaluator(ConstraintQueryBuilder, EvaluatorGroup).)
	CheckForSameDefinition(AccessConstraint)	Checks to determine if another instance has the same definition as this instance and returns if it does. Derived classes MUST override this method and check all new fields introduced by the derived class for definitional equivalence. It is NOT necessary to check base class fields because the base class will already have done that. When overriding this method, you should NOT call the base implementation because it will return for all derived-class instances. Derived classes should check the type of other to preserve the symmetric nature of IsSameDefinition(Object). (Inherited from MinimumMaximumAccessConstraint.)
	CheckForSameDefinition(AccessQuery)	Checks to determine if another instance has the same definition as this instance and returns if it does. Derived classes MUST override this method and check all new fields introduced by the derived class for definitional equivalence. It is NOT necessary to check base class fields because the base class will already have done that. When overriding this method, you should NOT call the base implementation because it will return for all derived-class instances. Derived classes should check the type of other to preserve the symmetric nature of IsSameDefinition(Object). (Inherited from AccessConstraint.)
	CheckForSameDefinition(DefinitionalObject)	Checks to determine if another instance has the same definition as this instance and returns if it does. Derived classes MUST override this method and check all new fields introduced by the derived class for definitional equivalence. It is NOT necessary to check base class fields because the base class will already have done that. When overriding this method, you should NOT call the base implementation because it will return for all derived-class instances. Derived classes should check the type of other to preserve the symmetric nature of IsSameDefinition(Object). (Inherited from AccessQuery.)
	CheckForSameDefinition(ElevationAngleConstraint)	Checks to determine if another instance has the same definition as this instance and returns if it does. Derived classes MUST override this method and check all new fields introduced by the derived class for definitional equivalence. It is NOT necessary to check base class fields because the base class will already have done that. When overriding this method, you should NOT call the base implementation because it will return for all derived-class instances. Derived classes should check the type of other to preserve the symmetric nature of IsSameDefinition(Object).
	CheckForSameDefinition(MinimumMaximumAccessConstraint)	Checks to determine if another instance has the same definition as this instance and returns if it does. Derived classes MUST override this method and check all new fields introduced by the derived class for definitional equivalence. It is NOT necessary to check base class fields because the base class will already have done that. When overriding this method, you should NOT call the base implementation because it will return for all derived-class instances. Derived classes should check the type of other to preserve the symmetric nature of IsSameDefinition(Object). (Overrides MinimumMaximumAccessConstraintCheckForSameDefinition(MinimumMaximumAccessConstraint).)
	Clone	Clones this object using the specified context. (Overrides DefinitionalObjectClone(CopyContext).)
	ComputeCurrentDefinitionHashCode	Computes a hash code based on the current properties of this object. Derived classes MUST override this method and compute a hash code that combines: a unique hash code seed, the base implementation result, and the hash codes of all new fields introduced by the derived class which are used in the CheckForSameDefinition(DefinitionalObject) method. (Overrides MinimumMaximumAccessConstraintComputeCurrentDefinitionHashCode.)
	EnumerateDependencies	Enumerates the dependencies of this object by calling EnumerateT(T) for each object that this object directly depends upon. Derived classes which contain additional dependencies MUST override this method, call the base implementation, and enumerate dependencies introduced by the derived class. (Overrides AccessConstraintEnumerateDependencies(DependencyEnumerator).)
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	Freeze	Freezes this object. Further attempts to modify it will result in an ObjectFrozenException. (Inherited from DefinitionalObject.)
	FreezeAggregatedObjects	Called by Freeze to also freeze any objects that are considered to be a part of this object. Derived classes which contain additional aggregated objects MUST override this method, call the base implementation, and freeze aggregated objects introduced by the derived class. The objects that need to be frozen in this method are frequently created in this object's constructor and are not settable via properties. (Inherited from AccessConstraint.)
	GetDefinitionHashCode	Gets a hash code representing the definition of this object. (Inherited from DefinitionalObject.)
	GetEvaluationOrder	Returns EvaluationOrder, indicating the suggested evaluation order of this constraint when it is used as part of an AccessQuery. Queries that hold sub-queries (such as an AccessQueryAnd) generally evaluate their sub-queries in ascending order of this value, so constraints with a lower evaluation order are evaluated earlier than constraints with a higher evaluation order. (Inherited from AccessConstraint.)
	GetEvaluator	Gets an evaluator that can be used to evaluate this query for a given time or for intervals of time. (Inherited from AccessQuery.)
	GetEvaluator(IServiceProvider)	Gets an evaluator that can be used to evaluate this query for a given time or for intervals of time. (Inherited from AccessQuery.)
	GetEvaluator(IServiceProvider, EvaluatorGroup)	Gets an evaluator that can be used to evaluate this query for a given time or for intervals of time. (Inherited from AccessConstraint.)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	IsSameDefinition	Determines if this object has the same definition as another object. (Inherited from DefinitionalObject.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ThrowIfFrozen	Throws ObjectFrozenException if this object IsFrozen. This method should be called from any method or property that modifies this object. (Inherited from DefinitionalObject.)
	ToDisjunctiveNormalForm	Transforms this query to disjunctive normal form (DNF). (Inherited from AccessConstraint.)
	ToString	Returns a string that represents the current object. (Overrides ObjectToString.)

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Remarks

Elevation is the angle between the relative position vector of the "other" object relative to the ConstrainedLinkEnd and the plane tangent to the surface of the central body at the location of the ConstrainedLinkEnd. It is measured as positive away from the central body.

This constraint requires that both ends of the ConstrainedLink provide ILocationPointService.

This constraint obtains the elevation angle using the evaluator returned by GetAzimuthElevationRangeEvaluator(VectorDisplacement, EvaluatorGroup).

Examples

The following example shows how to apply ElevationAngleConstraint to an Access computation:

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ElevationAngleConstraint constraint = new ElevationAngleConstraint();
constraint.MinimumValue = Trig.DegreesToRadians(10.0);
constraint.MaximumValue = Constants.HalfPi;

constraint.ConstrainedLink = new LinkInstantaneous(GetSatellite(), GetFacility());
constraint.ConstrainedLinkEnd = LinkRole.Receiver;

Reference

AGI.Foundation.Access.Constraints Namespace