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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) 2014
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 java.util.BitSet;
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 2D projection.
*
* @author Erich Schubert
*/
public class Simple2D extends AbstractSimpleProjection implements Projection2D {
/**
* Dimensions for fast projection mode.
*/
private int dim1;
/**
* Dimensions for fast projection mode.
*/
private int dim2;
/**
* Constructor with a given database and axes.
*
* @param scales Scales to use
* @param ax1 First axis
* @param ax2 Second axis
*/
public Simple2D(LinearScale[] scales, int ax1, int ax2) {
super(scales);
this.dim1 = ax1;
this.dim2 = ax2;
}
@Override
public double[] fastProjectDataToRenderSpace(double[] data) {
double x = (scales[dim1].getScaled(data[dim1]) - 0.5) * SCALE;
double y = (scales[dim2].getScaled(data[dim2]) - 0.5) * -SCALE;
return new double[] { x, y };
}
@Override
public double[] fastProjectDataToRenderSpace(NumberVector data) {
double x = (scales[dim1].getScaled(data.doubleValue(dim1)) - 0.5) * SCALE;
double y = (scales[dim2].getScaled(data.doubleValue(dim2)) - 0.5) * -SCALE;
return new double[] { x, y };
}
@Override
public double[] fastProjectDataToScaledSpace(double[] data) {
final int dim = data.length;
double[] ds = new double[dim];
for(int d = 0; d < dim; d++) {
ds[d] = scales[d].getScaled(data[d]);
}
return ds;
}
@Override
public double[] fastProjectDataToScaledSpace(NumberVector data) {
final int dim = data.getDimensionality();
double[] ds = new double[dim];
for(int d = 0; d < dim; d++) {
ds[d] = scales[d].getScaled(data.doubleValue(d));
}
return ds;
}
@Override
public double[] fastProjectScaledToRenderSpace(double[] v) {
double x = (v[dim1] - 0.5) * SCALE;
double y = (v[dim2] - 0.5) * -SCALE;
return new double[] { x, y };
}
@Override
public double[] fastProjectRenderToDataSpace(double[] v) {
double[] ret = new double[scales.length];
for(int d = 0; d < scales.length; d++) {
if(d == dim1) {
ret[d] = scales[d].getUnscaled((v[0] / SCALE) + 0.5);
}
else if(d == dim2) {
ret[d] = scales[d].getUnscaled((v[1] / -SCALE) + 0.5);
}
else {
ret[d] = scales[d].getUnscaled(0.5);
}
}
return ret;
}
@Override
public double[] fastProjectRenderToScaledSpace(double[] v) {
double[] ret = new double[scales.length];
for(int d = 0; d < scales.length; d++) {
if(d == dim1) {
ret[d] = (v[0] / SCALE) + 0.5;
}
else if(d == dim2) {
ret[d] = (v[1] / -SCALE) + 0.5;
}
else {
ret[d] = 0.5;
}
}
return ret;
}
@Override
public double[] fastProjectRelativeDataToRenderSpace(double[] data) {
double x = scales[dim1].getRelativeScaled(data[dim1]) * SCALE;
double y = scales[dim2].getRelativeScaled(data[dim2]) * -SCALE;
return new double[] { x, y };
}
@Override
public double[] fastProjectRelativeDataToRenderSpace(NumberVector data) {
double x = scales[dim1].getRelativeScaled(data.doubleValue(dim1)) * SCALE;
double y = scales[dim2].getRelativeScaled(data.doubleValue(dim2)) * -SCALE;
return new double[] { x, y };
}
@Override
public double[] fastProjectRelativeScaledToRenderSpace(double[] vr) {
double x = vr[dim1] * SCALE;
double y = vr[dim2] * -SCALE;
return new double[] { x, y };
}
@Override
public BitSet getVisibleDimensions2D() {
BitSet actDim = new BitSet();
actDim.set(dim1);
actDim.set(dim2);
return actDim;
}
@Override
public CanvasSize estimateViewport() {
return new CanvasSize(-SCALE * .5, SCALE * .5, -SCALE * .5, SCALE * .5);
}
@Override
protected Vector rearrange(Vector v) {
final double[] s = v.getArrayRef();
final double[] r = new double[s.length];
r[0] = s[dim1];
r[1] = s[dim2];
final int ldim = Math.min(dim1, dim2);
final int hdim = Math.max(dim1, dim2);
if(ldim > 0) {
System.arraycopy(s, 0, r, 2, ldim);
}
if(hdim - ldim > 1) {
System.arraycopy(s, ldim + 1, r, ldim + 2, hdim - (ldim + 1));
}
if(hdim + 1 < s.length) {
System.arraycopy(s, hdim + 1, r, hdim + 1, s.length - (hdim + 1));
}
return new Vector(r);
}
@Override
protected Vector dearrange(Vector v) {
final double[] s = v.getArrayRef();
final double[] r = new double[s.length];
r[dim1] = s[0];
r[dim2] = s[1];
// copy remainder
final int ldim = Math.min(dim1, dim2);
final int hdim = Math.max(dim1, dim2);
if(ldim > 0) {
System.arraycopy(s, 2, r, 0, ldim);
}
// ldim = s[0 or 1]
if(hdim - ldim > 1) {
System.arraycopy(s, ldim + 2, r, ldim + 1, hdim - (ldim + 1));
}
// hdim = s[0 or 1]
if(hdim + 1 < s.length) {
System.arraycopy(s, hdim + 1, r, hdim + 1, s.length - (hdim + 1));
}
return new Vector(r);
}
}
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