package de.lmu.ifi.dbs.elki.visualization.projections;
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;
/*
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/>.
*/
/**
* Abstract base class for full projections.
*
* Note: the full projection API may be removed at some point, unless we find a
* clear use case that cannot be done by the low level fast projections.
*
* @author Erich Schubert
*/
public abstract class AbstractFullProjection extends AbstractProjection implements FullProjection {
/**
* Constructor.
*
* @param scales Scales
*/
public AbstractFullProjection(LinearScale[] scales) {
super(scales);
}
/**
* Project a data vector from data space to scaled space.
*
* @param data vector in data space
* @return vector in scaled space
*/
@Override
public Vector projectDataToScaledSpace(NumberVector<?, ?> data) {
final int dim = data.getDimensionality();
Vector vec = new Vector(dim);
double[] ds = vec.getArrayRef();
for(int d = 0; d < dim; d++) {
ds[d] = scales[d].getScaled(data.doubleValue(d + 1));
}
return vec;
}
/**
* Project a data vector from data space to scaled space.
*
* @param data vector in data space
* @return vector in scaled space
*/
@Override
public Vector projectDataToScaledSpace(Vector data) {
double[] src = data.getArrayRef();
final int dim = src.length;
double[] dst = new double[dim];
for(int d = 0; d < dim; d++) {
dst[d] = scales[d].getScaled(src[d]);
}
return new Vector(dst);
}
/**
* Project a relative data vector from data space to scaled space.
*
* @param data relative vector in data space
* @return relative vector in scaled space
*/
@Override
public Vector projectRelativeDataToScaledSpace(NumberVector<?, ?> data) {
final int dim = data.getDimensionality();
Vector vec = new Vector(dim);
double[] ds = vec.getArrayRef();
for(int d = 0; d < dim; d++) {
ds[d] = scales[d].getRelativeScaled(data.doubleValue(d + 1));
}
return vec;
}
/**
* Project a relative data vector from data space to scaled space.
*
* @param data relative vector in data space
* @return relative vector in scaled space
*/
@Override
public Vector projectRelativeDataToScaledSpace(Vector data) {
double[] src = data.getArrayRef();
final int dim = src.length;
double[] dst = new double[dim];
for(int d = 0; d < dim; d++) {
dst[d] = scales[d].getRelativeScaled(src[d]);
}
return new Vector(dst);
}
/**
* Project a data vector from data space to rendering space.
*
* @param data vector in data space
* @return vector in rendering space
*/
@Override
public Vector projectDataToRenderSpace(NumberVector<?, ?> data) {
return projectScaledToRender(projectDataToScaledSpace(data));
}
/**
* Project a data vector from data space to rendering space.
*
* @param data vector in data space
* @return vector in rendering space
*/
@Override
public Vector projectDataToRenderSpace(Vector data) {
return projectScaledToRender(projectDataToScaledSpace(data));
}
/**
* Project a relative data vector from data space to rendering space.
*
* @param data relative vector in data space
* @return relative vector in rendering space
*/
@Override
public Vector projectRelativeDataToRenderSpace(NumberVector<?, ?> data) {
return projectRelativeScaledToRender(projectRelativeDataToScaledSpace(data));
}
/**
* Project a relative data vector from data space to rendering space.
*
* @param data relative vector in data space
* @return relative vector in rendering space
*/
@Override
public Vector projectRelativeDataToRenderSpace(Vector data) {
return projectRelativeScaledToRender(projectRelativeDataToScaledSpace(data));
}
/**
* Project a vector from scaled space to data space.
*
* @param <NV> Vector type
* @param v vector in scaled space
* @param factory Object factory
* @return vector in data space
*/
@Override
public <NV extends NumberVector<NV, ?>> NV projectScaledToDataSpace(Vector v, NV factory) {
final int dim = v.getDimensionality();
Vector vec = v.copy();
double[] ds = vec.getArrayRef();
for(int d = 0; d < dim; d++) {
ds[d] = scales[d].getUnscaled(ds[d]);
}
return factory.newNumberVector(vec.getArrayRef());
}
/**
* Project a vector from rendering space to data space.
*
* @param <NV> Vector type
* @param v vector in rendering space
* @param prototype Object factory
* @return vector in data space
*/
@Override
public <NV extends NumberVector<NV, ?>> NV projectRenderToDataSpace(Vector v, NV prototype) {
final int dim = v.getDimensionality();
Vector vec = projectRenderToScaled(v);
double[] ds = vec.getArrayRef();
// Not calling {@link #projectScaledToDataSpace} to avoid extra copy of
// vector.
for(int d = 0; d < dim; d++) {
ds[d] = scales[d].getUnscaled(ds[d]);
}
return prototype.newNumberVector(vec.getArrayRef());
}
/**
* Project a relative vector from scaled space to data space.
*
* @param <NV> Vector type
* @param v relative vector in scaled space
* @param prototype Object factory
* @return relative vector in data space
*/
@Override
public <NV extends NumberVector<NV, ?>> NV projectRelativeScaledToDataSpace(Vector v, NV prototype) {
final int dim = v.getDimensionality();
Vector vec = v.copy();
double[] ds = vec.getArrayRef();
for(int d = 0; d < dim; d++) {
ds[d] = scales[d].getRelativeUnscaled(ds[d]);
}
return prototype.newNumberVector(vec.getArrayRef());
}
/**
* Project a relative vector from rendering space to data space.
*
* @param <NV> Vector type
* @param v relative vector in rendering space
* @param prototype Object factory
* @return relative vector in data space
*/
@Override
public <NV extends NumberVector<NV, ?>> NV projectRelativeRenderToDataSpace(Vector v, NV prototype) {
final int dim = v.getDimensionality();
Vector vec = projectRelativeRenderToScaled(v);
double[] ds = vec.getArrayRef();
// Not calling {@link #projectScaledToDataSpace} to avoid extra copy of
// vector.
for(int d = 0; d < dim; d++) {
ds[d] = scales[d].getRelativeUnscaled(ds[d]);
}
return prototype.newNumberVector(vec.getArrayRef());
}
}