Object
- TimeStep

```
public class TimeStep
extends Object
```
Class encapsulating the timestep information.
A time step represents the elapsed time since the last update.

Since:

1.0.0

Version:

5.0.0

Author:

William Bittle

Field Summary

Fields
Modifier and Type	Field	Description
`protected double`	`dt`	The elapsed time
`protected double`	`dt0`	The last elapsed time
`protected double`	`dtRatio`	The elapsed time ratio from the last to the current
`protected double`	`invdt`	The inverse elapsed time
`protected double`	`invdt0`	The last inverse elapsed time

Constructor Summary

Constructors
Constructor Description

TimeStep(double dt)
Default constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`getDeltaTime()`	Returns the elapsed time since the last time step in seconds.
`double`	`getDeltaTimeRatio()`	Returns the ratio of the last elapsed time to the current elapsed time.
`double`	`getInverseDeltaTime()`	Returns the inverse of the elapsed time (in seconds) since the last time step.
`double`	`getPreviousInverseDeltaTime()`	Returns the previous frame's inverse elapsed time (in seconds).
`double`	`getPrevousDeltaTime()`	Returns the previous frame's elapsed time in seconds.
`String`	`toString()`
`void`	`update(double dt)`	Updates the current `TimeStep` using the new elapsed time.

Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - dt0
```
protected double dt0
```
    The last elapsed time
  - invdt0
```
protected double invdt0
```
    The last inverse elapsed time
  - dt
```
protected double dt
```
    The elapsed time
  - invdt
```
protected double invdt
```
    The inverse elapsed time
  - dtRatio
```
protected double dtRatio
```
    The elapsed time ratio from the last to the current
- Constructor Detail
  - TimeStep
```
public TimeStep(double dt)
```
    Default constructor.
    
    Parameters:
    
    dt - the initial delta time in seconds; must be greater than zero
    
    Throws:
    
    IllegalArgumentException - if dt is less than or equal to zero
- Method Detail
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - update
```
public void update(double dt)
```
    Updates the current TimeStep using the new elapsed time.
    
    Parameters:
    
    dt - in delta time in seconds; must be greater than zero
    
    Throws:
    
    IllegalArgumentException - if dt is less than or equal to zero
  - getDeltaTime
```
public double getDeltaTime()
```
    Returns the elapsed time since the last time step in seconds.
    
    Returns:
    
    double
  - getInverseDeltaTime
```
public double getInverseDeltaTime()
```
    Returns the inverse of the elapsed time (in seconds) since the last time step.
    
    Returns:
    
    double
  - getDeltaTimeRatio
```
public double getDeltaTimeRatio()
```
    Returns the ratio of the last elapsed time to the current elapsed time.
    This is used to cope with a variable time step.
    
    Returns:
    
    double
  - getPrevousDeltaTime
```
public double getPrevousDeltaTime()
```
    Returns the previous frame's elapsed time in seconds.
    
    Returns:
    
    double
  - getPreviousInverseDeltaTime
```
public double getPreviousInverseDeltaTime()
```
    Returns the previous frame's inverse elapsed time (in seconds).
    
    Returns:
    
    double

Class TimeStep

Field Summary

Constructor Summary

Method Summary

Methods inherited from class Object

Field Detail

dt0

invdt0

dt

invdt

dtRatio

Constructor Detail

TimeStep

Method Detail

toString

update

getDeltaTime

getInverseDeltaTime

getDeltaTimeRatio

getPrevousDeltaTime

getPreviousInverseDeltaTime