Package org.djunits.unit.scale

Class LinearScale

java.lang.Object
org.djunits.unit.scale.LinearScale
All Implemented Interfaces:
Serializable, Scale
Direct Known Subclasses:
IdentityScale, OffsetLinearScale
public class LinearScale
extends Object
implements Scale
A Scale for linear transformations not involving a zero-offset, e.g. for Length, Time, Area.
A linear scale is a scale that is linearly relates a unit to the underlying SI standard unit. E.g. Mile is linearly related to meter (the SI unit for length) and the conversion is zero-based (0 miles equals 0 meter). Unlike temperature in degrees Celsius which is not linearly related to the Kelvin (the SI unit for temperature) because the conversion is not zero-based (0°C is 273.15K).

Copyright (c) 2013-2019 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
BSD-style license. See OpenTrafficSim License.

Author:
Alexander Verbraeck, Peter Knoppers
See Also:
Serialized Form

  • Constructor Details

    • LinearScale

      public LinearScale​(double conversionFactorToStandardUnit)
      Construct a Scale for linear transformations.
      Parameters:
      conversionFactorToStandardUnit - double; the conversion factor by which this number has to be multiplied to convert it to the standard (e.g., SI) unit.

  • Method Details

    • toStandardUnit

      public double toStandardUnit​(double value)
      Convert a value to an SI value using this scale.
      Specified by:
      toStandardUnit in interface Scale
      Parameters:
      value - double; the value to convert
      Returns:
      the corresponding SI value

    • fromStandardUnit

      public double fromStandardUnit​(double value)
      Convert a value from an SI value to a value in the unit that uses this scale.
      Specified by:
      fromStandardUnit in interface Scale
      Parameters:
      value - double; the value to convert
      Returns:
      the corresponding value in the given unit

    • getConversionFactorToStandardUnit

      public final double getConversionFactorToStandardUnit()
      Retrieve the factor for conversion to the standard unit.
      Returns:
      double; the factor for conversion to the standard unit

    • isBaseSIScale

      public boolean isBaseSIScale()
      Return whether a scale is a 'standard' scale that would belong to an SI unit. For a linear scale, any scale with conversion factor 1 would be considered standard. For an offset scale, it would be considered standard if the offset is 0 and the conversion factor is 1.
      Specified by:
      isBaseSIScale in interface Scale
      Returns:
      boolean; whether the scale is a 'standard' scale that would belong to an SI unit.

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • equals

      public boolean equals​(Object obj)
      Overrides:
      equals in class Object

    • toString

      public String toString()
      Overrides:
      toString in class Object