//**********************************************************************************************
//        (C) Copyright 2002 by Dipl. Phys. Joerg Plewe, HARDCODE Development
//        All rights reserved. Copying, modification,
//        distribution or publication without the prior written
//        consent of the author is prohibited.
//
//    Created on 17. April 2002, 23:24
//**********************************************************************************************
package de.hardcode.jxinput.util;

import de.hardcode.jxinput.Axis;

/**
 *
 * @author  Herkules
 */
public class LatestChangedValueAxis implements Axis
{
    private final Axis mAxis1;
    private final Axis mAxis2;
    private       Axis mAxisInUse;

    private double mSaved1;
    private double mSaved2;
    
    /**
     * Creates a new instance of MeanValueAxis.
     */
    public LatestChangedValueAxis(Axis a1, Axis a2)
    {
        mAxis1      = a1;
        mAxis2      = a2;
        mAxisInUse  = a1;
        
        mSaved1 = a1.getValue();
        mSaved2 = a2.getValue();
    }
    
    /**
     * Features may have a name provided e.g. by the driver.
     */
    public String getName()
    {
        return mAxis1.getName();
    }
    
    /** Inform about the resolution of the axis.
     *
     * @return resolution, e.g. 2^-16
     */
    public double getResolution()
    {
        return mAxis1.getResolution();
    }
    
    /** 
     * Retrieve the type of the axis.
     *
     * @return [ TRANSLATION | ROTATION | SLIDER ]
     */
    public int getType()
    {
        return mAxis1.getType();
    }
    
    /** Returns the current value of the axis.
     * The range of the result depends on the axis type.
     *s
     * @return value [-1.0,1.0] or [0.0,1.0]
     */
    public double getValue()
    {
        double v1 = mAxis1.getValue();
        double v2 = mAxis2.getValue();

        if ( Math.abs( v2 - mSaved2 ) > 0.2 )
        {
            mAxisInUse = mAxis2;
            mSaved2 = v2;
        }
        if ( Math.abs( v1 - mSaved1 ) > 0.2 )
        {
            mAxisInUse = mAxis1;
            mSaved1 = v1;
        }
        
        return mAxisInUse.getValue();
    }
    
    /** Denote wether this feature has changed beyond it's resolution since it got last
     * updated.
     */
    public boolean hasChanged()
    {
        return true;
    }
    
}