Package org.djunits.quantity

Class Angle

java.lang.Object
java.lang.Number
org.djunits.quantity.def.Quantity<Angle>
org.djunits.quantity.Angle
All Implemented Interfaces:
Serializable, Comparable<Angle>, Additive<Angle>, Scalable<Angle>, Value<Angle>
public class Angle extends Quantity<Angle>
Angle is the measure of rotation between two intersecting lines, expressed in radians (rad) or degrees.

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:

  • Field Details

    • ZERO

      public static final Angle ZERO
      Constant with value zero radians.

    • PI

      public static final Angle PI
      Constant with value pi radians.

    • HALF_PI

      public static final Angle HALF_PI
      Constant with value pi/2 radians.

    • TWO_PI

      public static final Angle TWO_PI
      Constant with value 2 pi radians.

    • TAU

      public static final Angle TAU
      Constant with value tau radians.

    • ONE

      public static final Angle ONE
      Constant with value one radian.

    • NaN

      public static final Angle NaN
      Constant with value NaN.

    • POSITIVE_INFINITY

      public static final Angle POSITIVE_INFINITY
      Constant with value POSITIVE_INFINITY.

    • NEGATIVE_INFINITY

      public static final Angle NEGATIVE_INFINITY
      Constant with value NEGATIVE_INFINITY.

    • POS_MAXVALUE

      public static final Angle POS_MAXVALUE
      Constant with value MAX_VALUE.

    • NEG_MAXVALUE

      public static final Angle NEG_MAXVALUE
      Constant with value -MAX_VALUE.

  • Constructor Details

    • Angle

      public Angle(double value, Angle.Unit displayUnit, boolean useSi)
      Instantiate a Angle quantity with an SI or base value and a display unit.
      Parameters:
      value - the quantity value expressed in the SI or base unit
      displayUnit - the display unit to use
      useSi - use SI value when true, use value in unit when false

    • Angle

      public Angle(double valueInUnit, Angle.Unit unit)
      Instantiate a Angle quantity expressed in the given unit.
      Parameters:
      valueInUnit - the quantity value expressed in the given unit
      unit - the unit of the value, also acts as the display unit

  • Method Details

    • ofSi

      public static Angle ofSi(double si)
      Return a Angle instance based on an SI value.
      Parameters:
      si - the si value
      Returns:
      the Angle instance based on an SI value

    • ofSi

      public static Angle ofSi(double siValue, Angle.Unit displayUnit)
      Instantiate a Angle quantity with an SI or base value and a display unit.
      Parameters:
      siValue - the quantity value expressed in the SI or base unit
      displayUnit - the display unit to use
      Returns:
      the Angle instance based on an SI value with the given display unit

    • instantiateSi

      public Angle instantiateSi(double siValue, UnitInterface<Angle> displayUnit)
      Description copied from class: Quantity
      Instantiate a quantity with an SI or base value, and a display unit.
      Specified by:
      instantiateSi in class Quantity<Angle>
      Parameters:
      siValue - the value expressed in the base (SI) unit
      displayUnit - the display unit to use for the quantity
      Returns:
      a quantity with the given SI or base value, and the given display unit

    • valueOf

      public static Angle valueOf(String text)
      Returns a Angle 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 Angle
      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 Angle of(double valueInUnit, Angle.Unit unit)
      Returns a Angle based on a value expressed in the unit.
      Parameters:
      valueInUnit - the value, expressed in the given unit
      unit - the unit of the value, also acts as the display unit
      Returns:
      ab Angle representation of the value in its unit

    • of

      public static Angle of(double valueInUnit, String unitString)
      Returns a Angle based on a value and the textual representation of the unit, which can be localized.
      Parameters:
      valueInUnit - the value, expressed in the unit as given by unitString
      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

    • getDisplayUnit

      public Angle.Unit getDisplayUnit()
      Description copied from interface: Value
      Retrieve the unit of this Value.
      Specified by:
      getDisplayUnit in interface Value<Angle>
      Overrides:
      getDisplayUnit in class Quantity<Angle>
      Returns:
      the unit of this Value

    • add

      public Direction add(Direction direction)
      Add an (absolute) direction to this angle, and return a direction. The unit of the return value will be the unit of this angle, and the reference of the return value will be the reference belonging to the given direction. R.add(A) = unit of R and reference value of A.
      Parameters:
      direction - the absolute direction to add
      Returns:
      the absolute direction plus this angle

    • divide

      public Dimensionless divide(Angle v)
      Calculate the division of Angle and Angle, which results in a Dimensionless scalar.
      Parameters:
      v - scalar
      Returns:
      scalar as a division of Angle and Angle

    • multiply

      public AngularVelocity multiply(Frequency v)
      Calculate the multiplication of Angle and Frequency, which results in a AngularVelocity scalar.
      Parameters:
      v - scalar
      Returns:
      scalar as a multiplication of Angle and Frequency

    • divide

      public AngularVelocity divide(Duration v)
      Calculate the division of Angle and Duration, which results in a AngularVelocity scalar.
      Parameters:
      v - scalar
      Returns:
      scalar as a division of Angle and Duration

    • divide

      public Duration divide(AngularVelocity v)
      Calculate the division of Angle and AngularVelocity, which results in a Duration scalar.
      Parameters:
      v - scalar
      Returns:
      scalar as a division of Angle and AngularVelocity

    • normalize

      public static double normalize(double angle)
      Normalize an angle between 0 and 2 * PI.
      Parameters:
      angle - original angle.
      Returns:
      angle between 0 and 2 * PI.

    • normalize

      public static Angle normalize(Angle angle)
      Normalize an angle between 0 and 2 * PI.
      Parameters:
      angle - original angle.
      Returns:
      a new Angle object with angle between 0 and 2 * PI.