playn.core

Class Clock

java.lang.Object

playn.core.Clock

public class Clock
extends java.lang.Object

Encapsulates an absolute and delta time. Used by Game to emit simulation update and frame paint signals. Note: these values are exposed as public mutable fields for efficiency. Clients should naturally not mutate these values, only the clock provider.

Field Summary

Fields

Modifier and Type	Field and Description
float	alpha If this clock is used by a game with separate simulation and paint schedules, this value represents the fraction of time between the last simulation update and the next scheduled update.
int	dt The number of milliseconds that have elapsed since the last signal.
int	tick The number of milliseconds that have elapsed since time 0.

Constructor Summary

Constructors

Constructor and Description
Clock()

Method Summary

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

tick

public int tick

The number of milliseconds that have elapsed since time 0.

dt

public int dt

The number of milliseconds that have elapsed since the last signal.

alpha

public float alpha

If this clock is used by a game with separate simulation and paint schedules, this value represents the fraction of time between the last simulation update and the next scheduled update. This value is only provided for the paint clock.

For example if the previous update was scheduled to happen at T=500ms and the next update at T=530ms and the actual time at which we are being rendered is T=517ms then alpha will be (517-500)/(530-500) or 17/30. This is usually between 0 and 1, but if your game is running slowly, it can exceed 1. For example, if an update is scheduled to happen at T=500ms and the update actually happens at T=517ms, and the update call itself takes 20ms, the alpha value passed to paint will be (537-500)/(530-500) or 37/30.

Constructor Detail

Clock

public Clock()