1 package org.djunits.unit; 2 3 import static org.djunits.unit.unitsystem.UnitSystem.SI_DERIVED; 4 5 import org.djunits.unit.unitsystem.UnitSystem; 6 7 /** 8 * Standard solid angle unit. 9 * <p> 10 * Copyright (c) 2015-2019 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br> 11 * BSD-style license. See <a href="http://djunits.org/docs/license.html">DJUNITS License</a>. 12 * <p> 13 * $LastChangedDate: 2019-03-02 19:06:46 +0100 (Sat, 02 Mar 2019) $, @version $Revision: 342 $, by $Author: averbraeck $, 14 * initial version May 15, 2014 <br> 15 * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a> 16 */ 17 public class AngleSolidUnit extends LinearUnit<AngleSolidUnit> 18 { 19 /** */ 20 private static final long serialVersionUID = 20140607L; 21 22 /** The SI unit for solid angle is steradian. */ 23 public static final AngleSolidUnit SI; 24 25 /** steradian. */ 26 public static final AngleSolidUnit STERADIAN; 27 28 /** square degree. */ 29 public static final AngleSolidUnit SQUARE_DEGREE; 30 31 static 32 { 33 SI = new AngleSolidUnit("AngleSolidUnit.sr", SI_DERIVED); 34 STERADIAN = SI; 35 SQUARE_DEGREE = 36 new AngleSolidUnit("AngleSolidUnit.sq_deg", SI_DERIVED, STERADIAN, (Math.PI / 180.0) * (Math.PI / 180.0)); 37 } 38 39 /** 40 * Build a standard unit. 41 * @param abbreviationKey String; the key to the locale file for the abbreviation of the unit 42 * @param unitSystem UnitSystem; the unit system, e.g. SI or Imperial 43 */ 44 private AngleSolidUnit(final String abbreviationKey, final UnitSystem unitSystem) 45 { 46 super(abbreviationKey, unitSystem); 47 } 48 49 /** 50 * Construct a derived unit as a conversion from another unit. 51 * @param abbreviationKey String; the key to the locale file for the abbreviation of the unit 52 * @param unitSystem UnitSystem; the unit system, e.g. SI or Imperial 53 * @param referenceUnit AngleSolidUnit; the unit to convert to 54 * @param scaleFactorToReferenceUnit double; multiply a value in this unit by the factor to convert to the given reference 55 * unit 56 */ 57 private AngleSolidUnit(final String abbreviationKey, final UnitSystem unitSystem, final AngleSolidUnit referenceUnit, 58 final double scaleFactorToReferenceUnit) 59 { 60 super(abbreviationKey, unitSystem, referenceUnit, scaleFactorToReferenceUnit); 61 } 62 63 /** 64 * Build a user-defined unit with a conversion factor to another unit. 65 * @param name String; the long name of the unit 66 * @param abbreviation String; the abbreviation of the unit 67 * @param unitSystem UnitSystem; the unit system, e.g. SI or Imperial 68 * @param referenceUnit AngleSolidUnit; the unit to convert to 69 * @param scaleFactorToReferenceUnit double; multiply a value in this unit by the factor to convert to the given reference 70 * unit 71 */ 72 public AngleSolidUnit(final String name, final String abbreviation, final UnitSystem unitSystem, 73 final AngleSolidUnit referenceUnit, final double scaleFactorToReferenceUnit) 74 { 75 super(name, abbreviation, unitSystem, referenceUnit, scaleFactorToReferenceUnit); 76 } 77 78 /** {@inheritDoc} */ 79 @Override 80 public final AngleSolidUnit getStandardUnit() 81 { 82 return STERADIAN; 83 } 84 85 /** {@inheritDoc} */ 86 @Override 87 public final String getSICoefficientsString() 88 { 89 return "1"; 90 } 91 92 }