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package de.lmu.ifi.dbs.elki.visualization.projections;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2012
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import de.lmu.ifi.dbs.elki.data.NumberVector;
import de.lmu.ifi.dbs.elki.math.linearalgebra.Vector;
import de.lmu.ifi.dbs.elki.math.scales.LinearScale;
/**
* Dimension-selecting 1D projection.
*
* @author Erich Schubert
*/
public class Simple1D extends AbstractSimpleProjection implements Projection1D {
/**
* Our dimension, starting with 0
*/
final int dnum;
/**
* Simple 1D projection using scaling only.
*
* @param scales Scales to use
* @param dnum Dimension (starting at 0)
*/
public Simple1D(LinearScale[] scales, int dnum) {
super(scales);
this.dnum = dnum;
}
@Override
public double fastProjectDataToRenderSpace(Vector data) {
return (scales[dnum].getScaled(data.get(dnum)) - 0.5) * SCALE;
}
@Override
public double fastProjectDataToRenderSpace(NumberVector<?> data) {
return (scales[dnum].getScaled(data.doubleValue(dnum)) - 0.5) * SCALE;
}
@Override
public double fastProjectScaledToRender(Vector v) {
return (v.get(dnum) - 0.5) * SCALE;
}
@Override
public double fastProjectRelativeDataToRenderSpace(Vector data) {
return (scales[dnum].getScaled(data.get(dnum)) - 0.5) * SCALE;
}
@Override
public double fastProjectRelativeDataToRenderSpace(NumberVector<?> data) {
return (data.doubleValue(dnum) - 0.5) * SCALE;
}
@Override
public double fastProjectRelativeScaledToRender(Vector v) {
return v.get(dnum) * SCALE;
}
@Override
protected Vector rearrange(Vector v) {
final double[] s = v.getArrayRef();
final double[] r = new double[s.length];
r[0] = s[dnum];
if(dnum > 0) {
System.arraycopy(s, 0, r, 1, dnum);
}
if(dnum + 1 < s.length) {
System.arraycopy(s, dnum + 1, r, dnum + 1, s.length - (dnum + 1));
}
return new Vector(r);
}
@Override
protected Vector dearrange(Vector v) {
final double[] s = v.getArrayRef();
final double[] r = new double[s.length];
if(dnum > 0) {
System.arraycopy(s, 1, r, 0, dnum);
}
r[dnum] = s[0];
if(dnum + 1 < s.length) {
System.arraycopy(s, dnum + 1, r, dnum + 1, s.length - (dnum + 1));
}
return new Vector(r);
}
}
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