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package de.lmu.ifi.dbs.elki.visualization.visualizers.scatterplot;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2015
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 org.apache.batik.util.SVGConstants;
import org.w3c.dom.Element;
import de.lmu.ifi.dbs.elki.data.spatial.Polygon;
import de.lmu.ifi.dbs.elki.data.spatial.PolygonsObject;
import de.lmu.ifi.dbs.elki.data.type.TypeUtil;
import de.lmu.ifi.dbs.elki.database.datastore.DataStoreListener;
import de.lmu.ifi.dbs.elki.database.ids.DBIDIter;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
import de.lmu.ifi.dbs.elki.database.relation.RelationUtil;
import de.lmu.ifi.dbs.elki.math.linearalgebra.Vector;
import de.lmu.ifi.dbs.elki.utilities.datastructures.iterator.ArrayListIter;
import de.lmu.ifi.dbs.elki.utilities.exceptions.ObjectNotFoundException;
import de.lmu.ifi.dbs.elki.visualization.VisualizationTask;
import de.lmu.ifi.dbs.elki.visualization.VisualizationTree;
import de.lmu.ifi.dbs.elki.visualization.VisualizerContext;
import de.lmu.ifi.dbs.elki.visualization.css.CSSClass;
import de.lmu.ifi.dbs.elki.visualization.gui.VisualizationPlot;
import de.lmu.ifi.dbs.elki.visualization.projections.Projection;
import de.lmu.ifi.dbs.elki.visualization.projector.ScatterPlotProjector;
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.SVGUtil;
import de.lmu.ifi.dbs.elki.visualization.visualizers.AbstractVisFactory;
import de.lmu.ifi.dbs.elki.visualization.visualizers.Visualization;
/**
* Renders PolygonsObject in the data set.
*
* @author Erich Schubert
* @since 0.4.0
*
* @apiviz.stereotype factory
* @apiviz.uses Instance oneway - - «create»
*/
public class PolygonVisualization extends AbstractVisFactory {
/**
* A short name characterizing this Visualizer.
*/
private static final String NAME = "Polygons";
/**
* Constructor
*/
public PolygonVisualization() {
super();
}
@Override
public Visualization makeVisualization(VisualizationTask task, VisualizationPlot plot, double width, double height, Projection proj) {
return new Instance(task, plot, width, height, proj);
}
@Override
public void processNewResult(VisualizerContext context, Object result) {
VisualizationTree.findNewResultVis(context, result, Relation.class, ScatterPlotProjector.class, new VisualizationTree.Handler2<Relation<?>, ScatterPlotProjector<?>>() {
@Override
public void process(VisualizerContext context, Relation<?> rel, ScatterPlotProjector<?> p) {
if(!TypeUtil.POLYGON_TYPE.isAssignableFromType(rel.getDataTypeInformation())) {
return;
}
if(RelationUtil.dimensionality(p.getRelation()) != 2) {
return;
}
// Assume that a 2d projector is using the same coordinates as the
// polygons.
final VisualizationTask task = new VisualizationTask(NAME, context, rel, rel, PolygonVisualization.this);
task.level = VisualizationTask.LEVEL_DATA - 10;
task.addUpdateFlags(VisualizationTask.ON_DATA);
context.addVis(rel, task);
context.addVis(p, task);
}
});
}
/**
* Instance
*
* @author Erich Schubert
*
* @apiviz.has PolygonsObject - - visualizes
*/
public class Instance extends AbstractScatterplotVisualization implements DataStoreListener {
/**
* Generic tag to indicate the type of element. Used in IDs, CSS-Classes
* etc.
*/
public static final String POLYS = "polys";
/**
* The representation we visualize
*/
final protected Relation<PolygonsObject> rep;
/**
* Constructor.
*
* @param task Task to visualize
* @param plot Plot to draw to
* @param width Embedding width
* @param height Embedding height
* @param proj Projection
*/
public Instance(VisualizationTask task, VisualizationPlot plot, double width, double height, Projection proj) {
super(task, plot, width, height, proj);
this.rep = task.getResult(); // Note: relation was used for projection
addListeners();
}
@Override
public void fullRedraw() {
setupCanvas();
final StyleLibrary style = context.getStyleLibrary();
CSSClass css = new CSSClass(svgp, POLYS);
// TODO: separate fill and line colors?
css.setStatement(SVGConstants.CSS_STROKE_WIDTH_PROPERTY, style.getLineWidth(StyleLibrary.POLYGONS));
css.setStatement(SVGConstants.CSS_STROKE_PROPERTY, style.getColor(StyleLibrary.POLYGONS));
css.setStatement(SVGConstants.CSS_FILL_PROPERTY, SVGConstants.CSS_NONE_VALUE);
svgp.addCSSClassOrLogError(css);
svgp.updateStyleElement();
// draw data
for(DBIDIter iditer = rep.iterDBIDs(); iditer.valid(); iditer.advance()) {
try {
PolygonsObject poly = rep.get(iditer);
if(poly == null) {
continue;
}
SVGPath path = new SVGPath();
for(Polygon ppoly : poly.getPolygons()) {
Vector first = ppoly.get(0);
double[] f = proj.fastProjectDataToRenderSpace(first.getArrayRef());
path.moveTo(f[0], f[1]);
for(ArrayListIter<Vector> it = ppoly.iter(); it.valid(); it.advance()) {
if(it.getOffset() == 0) {
continue;
}
double[] p = proj.fastProjectDataToRenderSpace(it.get().getArrayRef());
path.drawTo(p[0], p[1]);
}
// close path.
path.drawTo(f[0], f[1]);
}
Element e = path.makeElement(svgp);
SVGUtil.addCSSClass(e, POLYS);
layer.appendChild(e);
}
catch(ObjectNotFoundException e) {
// ignore.
}
}
}
}
}
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