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/*
* Copyright (c) 2009-2010 jMonkeyEngine
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of 'jMonkeyEngine' nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jme3.system;
/**
* <code>Timer</code> is the base class for a high resolution timer. It is
* created from getTimer("display system")
*
* @author Mark Powell
* @version $Id: Timer.java,v 1.18 2007/03/09 10:19:34 rherlitz Exp $
*/
public abstract class Timer {
/**
* Returns the current time in ticks. A tick is an arbitrary measure of time
* defined by the timer implementation. The number of ticks per second is
* given by <code>getResolution()</code>. The timer starts at 0 ticks.
*
* @return a long value representing the current time
*/
public abstract long getTime();
/**
* Returns the time in seconds. The timer starts
* at 0.0 seconds.
*
* @return the current time in seconds
*/
public float getTimeInSeconds() {
return getTime() / (float) getResolution();
}
/**
* Returns the resolution of the timer.
*
* @return the number of timer ticks per second
*/
public abstract long getResolution();
/**
* Returns the "calls per second". If this is called every frame, then it
* will return the "frames per second".
*
* @return The "calls per second".
*/
public abstract float getFrameRate();
/**
* Returns the time, in seconds, between the last call and the current one.
*
* @return Time between this call and the last one.
*/
public abstract float getTimePerFrame();
/**
* <code>update</code> recalculates the frame rate based on the previous
* call to update. It is assumed that update is called each frame.
*/
public abstract void update();
/**
* Reset the timer to 0. Clear any tpf history.
*/
public abstract void reset();
}
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