Package playn.core

Class Clock

java.lang.Object
playn.core.Clock
public class Clock extends 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
    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
    Description
    Clock()
     

  • Method Summary

    Methods inherited from class java.lang.Object

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

  • Field Details

    • 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 Details

    • Clock

      public Clock()