SolidAngleUnit.java
package org.djunits.unit;
import org.djunits.quantity.Quantity;
import org.djunits.unit.scale.IdentityScale;
import org.djunits.unit.si.SIPrefixes;
import org.djunits.unit.unitsystem.UnitSystem;
/**
* Standard solid angle unit.
* <p>
* Copyright (c) 2015-2024 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
* BSD-style license. See <a href="https://djunits.org/docs/license.html">DJUNITS License</a>
* </p>
* @author <a href="https://www.tudelft.nl/averbraeck">Alexander Verbraeck</a>
*/
public class SolidAngleUnit extends Unit<SolidAngleUnit>
{
/** */
private static final long serialVersionUID = 20140607L;
/** The base, with "sr" as the SI signature. */
public static final Quantity<SolidAngleUnit> BASE = new Quantity<>("SolidAngle", "sr");
/** The SI unit for solid angle is steradian. */
public static final SolidAngleUnit SI =
new SolidAngleUnit().build(new Unit.Builder<SolidAngleUnit>().setQuantity(BASE).setId("sr").setName("steradian")
.setUnitSystem(UnitSystem.SI_DERIVED).setSiPrefixes(SIPrefixes.NONE, 1.0).setScale(IdentityScale.SCALE));
/** steradian. */
public static final SolidAngleUnit STERADIAN = SI;
/** square degree. */
public static final SolidAngleUnit SQUARE_DEGREE =
STERADIAN.deriveLinear((Math.PI / 180.0) * (Math.PI / 180.0), "sq.deg", "square degree");
}