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/*
*
* Copyright (c) 2010 Steve Slaven
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package net.hoopajoo.android.SoftKeys;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
// keeps a list of points to drop outliers that make your drag jitter
public class InputSmoother {
private List<PointCheck> mPoints = new ArrayList<PointCheck>();
private int mHistLength;
private PointCheck mCurrent;
InputSmoother( int histLength ) {
mHistLength = histLength;
}
public void addPoint( int x, int y ) {
PointCheck p = new PointCheck();
p.x = x;
p.y = y;
mPoints.add( p );
// if points too big pop out the last
if( mPoints.size() > mHistLength ) {
mPoints.remove( 0 );
}
}
public void updateOutliers() {
// flag the outliers
for( PointCheck p : mPoints ) {
p.outlier = false;
}
// set current as the last non-outlier
mCurrent = null;
for( PointCheck p : new ListReverser<PointCheck>( mPoints ) ) {
if( mCurrent != null ) {
if( p.outlier == false ) {
mCurrent = p;
}
}
}
// if still null just give it the last one even though it's an outlier
if( mCurrent == null ) {
mCurrent = mPoints.get( mPoints.size() - 1 );
}
}
public int[] getCurrent() {
int[] ret = new int[ 2 ];
ret[ 0 ] = mCurrent.x;
ret[ 1 ] = mCurrent.y;
return( ret );
}
private class PointCheck {
public int x;
public int y;
public boolean outlier;
}
class ListReverser<T> implements Iterable<T> {
private ListIterator<T> listIterator;
public ListReverser(List<T> wrappedList) {
this.listIterator = wrappedList.listIterator(wrappedList.size());
}
public Iterator<T> iterator() {
return new Iterator<T>() {
public boolean hasNext() {
return listIterator.hasPrevious();
}
public T next() {
return listIterator.previous();
}
public void remove() {
listIterator.remove();
}
};
}
}
}
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