Android Open Source - LucyTheMoocher Timer

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License

The source code is released under:

MIT License

Java Source Code

package com.lucythemoocher.util;
/*from   w  ww.j av  a  2  s  .  c  o  m*/

/**
 * Time and time elapsed between two last updates
 * Can be slowed or accelerated by a factor with setFactor
 * Unity is millisecond
 * You have two ways to update a timer:
 * - call addDt(float) to update Dt with a parameter you choose
 * - call update() and addDt will be called with Dt = current system time - system time in last update
 * Don't use both functions since update calls addDt
 */
public class Timer {
  float currentTime_;
  float dt_;
  float factor_;
  long previousSystemTime_;
  float initTime_;
  
  
  /**
   * Constructor
   * @param time in ms
   */
  public Timer(float time) {
    dt_ = 0.0000001f; // avoid null divisions
    currentTime_ = time;
    factor_ = 1.0f; // no factor by default
    previousSystemTime_ = System.currentTimeMillis();
    initTime_ = currentTime_;
  }
  
  /**
   * Reset timer
   */
  public void reset() {
    currentTime_ = 0;
    previousSystemTime_ = System.currentTimeMillis();
    initTime_ = currentTime_;
  }
  
  /**
   * Update dt and the current time with the system clock.
   * Don't call it if you also use addDt().
   */
  public void update() {
    long current = System.currentTimeMillis();
    addDt(current - previousSystemTime_);
    previousSystemTime_ = current;
  }
  
  /**
   * Update time. 
   * Don't call it if you use update().
   * @param dt Time elapsed in ms
   */
  public void addDt(float dt) {
    
    dt_ = dt * factor_;
    currentTime_ += dt_;
  }
  
  /**
   * Getter
   * @return current time
   */
  public float getTime() {
    return currentTime_;
  }
  
  /**
   * Getter
   * @return Time between the two last setTime(float)
   * @see Timer#setTime(float)
   */
  public float getDt() {
    return dt_;
  }
  
  /**
   * Mutator
   * @param factor
   */
  public void setFactor(float factor) {
    factor_ = factor;
  }
  
  /**
   * Update the timer and return the time from it's creation
   * @return time in ms
   */
  public float timeFromCreation() {
    update();
    return currentTime_ - initTime_;
  }
}

Java Source Code List

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