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/*
* TimeBase.java
*
* The Salamander Project - 2D and 3D graphics libraries in Java
* Copyright (C) 2004 Mark McKay
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Mark McKay can be contacted at mark@kitfox.com. Salamander and other
* projects can be found at http://www.kitfox.com
*
* Created on August 15, 2004, 3:31 AM
*/
package com.kitfox.svg.animation;
import java.util.regex.*;
/**
* SVG has a complicated way of specifying time. Potentially, a time could
* be represened as a summation of discrete times and times of other animation
* events. This provides a root for the many elements we will need to define
* time.
*
* @author Mark McKay
* @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
*/
abstract public class TimeBase
{
static final Matcher matchIndefinite = Pattern.compile("\\s*indefinite\\s*").matcher("");
static final Matcher matchUnitTime = Pattern.compile("\\s*([-+]?((\\d*\\.\\d+)|(\\d+))([-+]?[eE]\\d+)?)\\s*(h|min|s|ms)?\\s*").matcher("");
/*
public static TimeBase parseTime(String text)
{
if (text == null) return null;
if (text.indexOf('+') == -1)
{
return parseTimeComponent(text);
}
return new TimeCompound(text);
}
*/
protected static TimeBase parseTimeComponent(String text)
{
matchIndefinite.reset(text);
if (matchIndefinite.matches()) return new TimeIndefinite();
matchUnitTime.reset(text);
if (matchUnitTime.matches())
{
String val = matchUnitTime.group(1);
String units = matchUnitTime.group(6);
double time = 0;
try { time = Double.parseDouble(val); }
catch (Exception e) {}
if (units.equals("ms")) time *= .001;
else if (units.equals("min")) time *= 60;
else if (units.equals("h")) time *= 3600;
return new TimeDiscrete(time);
}
return null;
}
/**
* Calculates the (greater than or equal to 0) time in seconds this
* time represents. If the time cannot be determined, returns
* Double.NaN. If this represents an infinte amount of time, returns
* Double.POSITIVE_INFINITY.
*/
abstract public double evalTime();
/**
* Some time elements need to refer to the animation element that contains
* them to evaluate correctly
*/
public void setParentElement(AnimationElement ele)
{
}
}
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