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package de.lmu.ifi.dbs.elki.visualization.visualizers.vis2d;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
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.ArrayList;
import java.util.Iterator;
import org.apache.batik.util.SVGConstants;
import org.w3c.dom.Element;
import de.lmu.ifi.dbs.elki.data.NumberVector;
import de.lmu.ifi.dbs.elki.data.spatial.Polygon;
import de.lmu.ifi.dbs.elki.database.datastore.DataStoreEvent;
import de.lmu.ifi.dbs.elki.database.datastore.DataStoreListener;
import de.lmu.ifi.dbs.elki.database.ids.DBID;
import de.lmu.ifi.dbs.elki.database.ids.DBIDs;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
import de.lmu.ifi.dbs.elki.math.ConvexHull2D;
import de.lmu.ifi.dbs.elki.math.linearalgebra.Vector;
import de.lmu.ifi.dbs.elki.result.DBIDSelection;
import de.lmu.ifi.dbs.elki.result.HierarchicalResult;
import de.lmu.ifi.dbs.elki.result.Result;
import de.lmu.ifi.dbs.elki.result.ResultUtil;
import de.lmu.ifi.dbs.elki.result.SelectionResult;
import de.lmu.ifi.dbs.elki.utilities.exceptions.ObjectNotFoundException;
import de.lmu.ifi.dbs.elki.utilities.iterator.IterableUtil;
import de.lmu.ifi.dbs.elki.visualization.css.CSSClass;
import de.lmu.ifi.dbs.elki.visualization.projections.Projection;
import de.lmu.ifi.dbs.elki.visualization.projections.Projection2D;
import de.lmu.ifi.dbs.elki.visualization.style.StyleLibrary;
import de.lmu.ifi.dbs.elki.visualization.svg.SVGPath;
import de.lmu.ifi.dbs.elki.visualization.svg.SVGPlot;
import de.lmu.ifi.dbs.elki.visualization.svg.SVGUtil;
import de.lmu.ifi.dbs.elki.visualization.visualizers.AbstractVisFactory;
import de.lmu.ifi.dbs.elki.visualization.visualizers.Visualization;
import de.lmu.ifi.dbs.elki.visualization.visualizers.VisualizationTask;
import de.lmu.ifi.dbs.elki.visualization.visualizers.VisualizerUtil;
import de.lmu.ifi.dbs.elki.visualization.visualizers.events.ContextChangeListener;
import de.lmu.ifi.dbs.elki.visualization.visualizers.thumbs.ThumbnailVisualization;
/**
* Visualizer for generating an SVG-Element containing the convex hull of the
* selected points
*
* @author Robert Rödler
*
* @apiviz.has SelectionResult oneway - - visualizes
* @apiviz.has DBIDSelection oneway - - visualizes
* @apiviz.uses ConvexHull2D
*
* @param <NV> Type of the NumberVector being visualized.
*/
public class SelectionConvexHullVisualization<NV extends NumberVector<NV, ?>> extends P2DVisualization<NV> implements ContextChangeListener, DataStoreListener {
/**
* A short name characterizing this Visualizer.
*/
private static final String NAME = "Convex Hull of Selection";
/**
* Generic tag to indicate the type of element. Used in IDs, CSS-Classes etc.
*/
public static final String SELECTEDHULL = "selectionConvexHull";
/**
* Constructor.
*
* @param task Task
*/
public SelectionConvexHullVisualization(VisualizationTask task) {
super(task);
context.addContextChangeListener(this);
context.addResultListener(this);
context.addDataStoreListener(this);
incrementalRedraw();
}
@Override
protected void redraw() {
addCSSClasses(svgp);
DBIDSelection selContext = context.getSelection();
if(selContext != null) {
DBIDs selection = selContext.getSelectedIds();
ConvexHull2D hull = new ConvexHull2D();
for(DBID i : selection) {
try {
hull.add(new Vector(proj.fastProjectDataToRenderSpace(rep.get(i))));
}
catch(ObjectNotFoundException e) {
// ignore
}
}
Polygon chres = hull.getHull();
if(chres != null && chres.size() >= 3) {
SVGPath path = new SVGPath(chres);
Element selHull = path.makeElement(svgp);
SVGUtil.addCSSClass(selHull, SELECTEDHULL);
// TODO: use relative selection size for opacity?
layer.appendChild(selHull);
}
}
}
/**
* Adds the required CSS-Classes
*
* @param svgp SVG-Plot
*/
private void addCSSClasses(SVGPlot svgp) {
// Class for the dot markers
if(!svgp.getCSSClassManager().contains(SELECTEDHULL)) {
CSSClass cls = new CSSClass(this, SELECTEDHULL);
// cls = new CSSClass(this, CONVEXHULL);
cls.setStatement(SVGConstants.CSS_STROKE_PROPERTY, context.getStyleLibrary().getColor(StyleLibrary.SELECTION));
cls.setStatement(SVGConstants.CSS_STROKE_WIDTH_PROPERTY, context.getStyleLibrary().getLineWidth(StyleLibrary.SELECTION));
cls.setStatement(SVGConstants.CSS_FILL_PROPERTY, context.getStyleLibrary().getColor(StyleLibrary.SELECTION));
cls.setStatement(SVGConstants.CSS_OPACITY_PROPERTY, ".25");
cls.setStatement(SVGConstants.CSS_STROKE_LINECAP_PROPERTY, SVGConstants.CSS_ROUND_VALUE);
cls.setStatement(SVGConstants.CSS_STROKE_LINEJOIN_PROPERTY, SVGConstants.CSS_ROUND_VALUE);
svgp.addCSSClassOrLogError(cls);
}
}
@Override
public void contentChanged(@SuppressWarnings("unused") DataStoreEvent e) {
synchronizedRedraw();
}
/**
* Factory for visualizers to generate an SVG-Element containing the convex
* hull of the selected points
*
* @author Robert Rödler
*
* @apiviz.stereotype factory
* @apiviz.uses SelectionConvexHullVisualization oneway - - «create»
*
* @param <NV> Type of the NumberVector being visualized.
*/
public static class Factory<NV extends NumberVector<NV, ?>> extends AbstractVisFactory {
/**
* Constructor
*/
public Factory() {
super();
}
@Override
public Visualization makeVisualization(VisualizationTask task) {
return new SelectionConvexHullVisualization<NV>(task);
}
@Override
public Visualization makeVisualizationOrThumbnail(VisualizationTask task) {
return new ThumbnailVisualization(this, task, ThumbnailVisualization.ON_DATA | ThumbnailVisualization.ON_SELECTION);
}
@Override
public void processNewResult(HierarchicalResult baseResult, Result result) {
Iterator<Relation<? extends NumberVector<?, ?>>> reps = VisualizerUtil.iterateVectorFieldRepresentations(baseResult);
for(Relation<? extends NumberVector<?, ?>> rep : IterableUtil.fromIterator(reps)) {
final ArrayList<SelectionResult> selectionResults = ResultUtil.filterResults(result, SelectionResult.class);
for(SelectionResult selres : selectionResults) {
final VisualizationTask task = new VisualizationTask(NAME, selres, rep, this, P2DVisualization.class);
task.put(VisualizationTask.META_LEVEL, VisualizationTask.LEVEL_DATA - 2);
baseResult.getHierarchy().add(selres, task);
}
}
}
@Override
public Class<? extends Projection> getProjectionType() {
return Projection2D.class;
}
}
}
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