Package org.djunits.quantity

Class SolidAngle

java.lang.Object

java.lang.Number

org.djunits.quantity.def.Quantity<SolidAngle,SolidAngle.Unit>

org.djunits.quantity.SolidAngle

All Implemented Interfaces:

Serializable, Comparable<SolidAngle>, Additive<SolidAngle>, Scalable<SolidAngle>, Value<SolidAngle.Unit,SolidAngle>

public class SolidAngle
extends Quantity<SolidAngle,SolidAngle.Unit>

Solid angle is the two-dimensional angle in three-dimensional space, measured in steradians (sr).

Copyright (c) 2025-2026 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See for project information https://djunits.org. The DJUNITS project is distributed under a three-clause BSD-style license.

Author:

Alexander Verbraeck

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SolidAngle.Unit	SolidAngle.Unit encodes the units of solid angles.

Field Summary

Fields

Modifier and Type	Field	Description
static final SolidAngle	NaN	Constant with value NaN.
static final SolidAngle	NEG_MAXVALUE	Constant with value -MAX_VALUE.
static final SolidAngle	NEGATIVE_INFINITY	Constant with value NEGATIVE_INFINITY.
static final SolidAngle	ONE	Constant with value one.
static final SolidAngle	POS_MAXVALUE	Constant with value MAX_VALUE.
static final SolidAngle	POSITIVE_INFINITY	Constant with value POSITIVE_INFINITY.
static final SolidAngle	ZERO	Constant with value zero.

Constructor Summary

Constructors

Constructor	Description
SolidAngle(double value, String abbreviation)	Instantiate a SolidAngle quantity with a unit, expressed as a String.
SolidAngle(double value, SolidAngle.Unit unit)	Instantiate a SolidAngle quantity with a unit.
SolidAngle(SolidAngle value)	Construct SolidAngle quantity.

Method Summary

Modifier and Type	Method	Description
final Dimensionless	divide(SolidAngle v)	Calculate the division of SolidAngle and SolidAngle, which results in a Dimensionless quantity.
SolidAngle	instantiate(double si)	Instantiate a quantity with an SI or base value.
final LuminousFlux	multiply(LuminousIntensity v)	Calculate the multiplication of SolidAngle and LuminousIntensity, which results in a LuminousFlux scalar.
static SolidAngle	of(double value, String unitString)	Returns a SolidAngle based on a value and the textual representation of the unit, which can be localized.
static SolidAngle	ofSi(double si)	Return a SolidAngle instance based on an SI value.
SIUnit	siUnit()	Return the SI unit of this quantity.
static SolidAngle	valueOf(String text)	Returns a SolidAngle representation of a textual representation of a value with a unit.

Methods inherited from class org.djunits.quantity.def.Quantity

abs, add, as, compareTo, divide, doubleValue, eq, eq0, equals, floatValue, format, format, ge, ge0, getDisplayUnit, getInUnit, getInUnit, getName, gt, gt0, hashCode, instantiate, interpolate, intValue, isRelative, le, le0, longValue, lt, lt0, max, mean, min, multiply, ne, ne0, negate, of, product, reciprocal, scaleBy, setDisplayUnit, si, subtract, sum, toDisplayString, toDisplayString, toString, toString, toString, toString, toStringSIPrefixed, toStringSIPrefixed, toTextualString, toTextualString, valueOf

Methods inherited from class java.lang.Number

byteValue, shortValue

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.djunits.value.Scalable

divideBy

Methods inherited from interface org.djunits.value.Value

isAbsolute, setDisplayUnit

Field Details

ZERO

public static final SolidAngle ZERO

Constant with value zero.

ONE

public static final SolidAngle ONE

Constant with value one.

NaN

public static final SolidAngle NaN

Constant with value NaN.

POSITIVE_INFINITY

public static final SolidAngle POSITIVE_INFINITY

Constant with value POSITIVE_INFINITY.

NEGATIVE_INFINITY

public static final SolidAngle NEGATIVE_INFINITY

Constant with value NEGATIVE_INFINITY.

POS_MAXVALUE

public static final SolidAngle POS_MAXVALUE

Constant with value MAX_VALUE.

NEG_MAXVALUE

public static final SolidAngle NEG_MAXVALUE

Constant with value -MAX_VALUE.

Constructor Details

SolidAngle

public SolidAngle(double value,
 SolidAngle.Unit unit)

Instantiate a SolidAngle quantity with a unit.

Parameters:

value - the value, expressed in the unit

unit - the unit in which the value is expressed

SolidAngle

public SolidAngle(double value,
 String abbreviation)

Instantiate a SolidAngle quantity with a unit, expressed as a String.

Parameters:

value - the value, expressed in the unit

abbreviation - the String abbreviation of the unit in which the value is expressed

SolidAngle

public SolidAngle(SolidAngle value)

Construct SolidAngle quantity.

Parameters:

value - Scalar from which to construct this instance

Method Details

ofSi

public static SolidAngle ofSi(double si)

Return a SolidAngle instance based on an SI value.

Parameters:

si - the si value

Returns:

the SolidAngle instance based on an SI value

instantiate

public SolidAngle instantiate(double si)

Description copied from class: Quantity

Instantiate a quantity with an SI or base value.

Specified by:

instantiate in class Quantity<SolidAngle,SolidAngle.Unit>

Parameters:

si - the value expressed in the base (SI) unit

Returns:

a quantity with the given SI-value and base (SI) unit

siUnit

public SIUnit siUnit()

Description copied from class: Quantity

Return the SI unit of this quantity.

Overrides:

siUnit in class Quantity<SolidAngle,SolidAngle.Unit>

Returns:

the SI unit of this quantity

valueOf

public static SolidAngle valueOf(String text)

Returns a SolidAngle representation of a textual representation of a value with a unit. The String representation that can be parsed is the double value in the unit, followed by a localized or English abbreviation of the unit. Spaces are allowed, but not required, between the value and the unit.

Parameters:

text - the textual representation to parse into a SolidAngle

Returns:

the Scalar representation of the value in its unit

Throws:

IllegalArgumentException - when the text cannot be parsed

NullPointerException - when the text argument is null

of

public static SolidAngle of(double value,
 String unitString)

Returns a SolidAngle based on a value and the textual representation of the unit, which can be localized.

Parameters:

value - the value to use

unitString - the textual representation of the unit

Returns:

the Scalar representation of the value in its unit

Throws:

IllegalArgumentException - when the unit cannot be parsed or is incorrect

NullPointerException - when the unitString argument is null

divide

public final Dimensionless divide(SolidAngle v)

Calculate the division of SolidAngle and SolidAngle, which results in a Dimensionless quantity.

Parameters:

v - quantity

Returns:

quantity as a division of SolidAngle and SolidAngle

multiply

public final LuminousFlux multiply(LuminousIntensity v)

Calculate the multiplication of SolidAngle and LuminousIntensity, which results in a LuminousFlux scalar.

Parameters:

v - scalar

Returns:

scalar as a multiplication of SolidAngle and LuminousIntensity