PointClusterer.java~
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/*
* Copyright (C) 2008-2009, Uwe Schmidt
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* The Software uses a third-party library (WiiRemoteJ) which is not part of
* the Software and is subject to its own license.
*/
package org.uweschmidt.wiimote.whiteboard.calibration;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.uweschmidt.wiimote.whiteboard.ds.IRDot;
import org.uweschmidt.wiimote.whiteboard.ds.Wiimote;
import org.uweschmidt.wiimote.whiteboard.preferences.WWPreferences;
public class PointClusterer {
static {
if (WWPreferences.WIIMOTES > 2)
throw new RuntimeException("Clustering for more than 2 Wiimotes not implemented yet.");
}
/**
* @return array of clusters (first index = cluster number, second index = dots in cluster)
*/
public static IRDot[][] cluster(Map<Wiimote, IRDot[]> data) {
IRDot[][] cluster = new IRDot[4][];
// trivial case
if (data.size() == 1) {
IRDot[] values = data.values().iterator().next();
int j = 0;
for (int i = 0; i < 4; i++)
if (values[i] != null)
cluster[j++] = new IRDot[] { values[i] };
return cluster;
}
Wiimote[] wiimotes = new Wiimote[data.keySet().size()];
data.keySet().toArray(wiimotes);
Set<IRDot> used = new HashSet<IRDot>();
int c = 0;
for (int a = 0; a < 2; a++) {
for (int i = 0; i < 4; i++) {
IRDot dot1 = data.get(wiimotes[a])[i];
if (dot1 == null || used.contains(dot1))
continue;
IRDot minDot = null;
double minDist = Double.POSITIVE_INFINITY;
for (int j = 0; j < 4; j++) {
IRDot dot2 = data.get(wiimotes[(a+1)%2])[j];
if (dot2 == null || used.contains(dot2))
continue;
double dist = dot1.distance(dot2);
if (dist < minDist) {
minDot = dot2;
minDist = dist;
}
}
used.add(dot1);
if (minDot == null) {
cluster[c++] = new IRDot[] { dot1 };
} else {
cluster[c++] = new IRDot[] { dot1, minDot };
used.add(minDot);
}
}
}
return cluster;
}
}