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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.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.math.linearalgebra.Vector;
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.utilities.DatabaseUtil;
import de.lmu.ifi.dbs.elki.utilities.iterator.IterableUtil;
import de.lmu.ifi.dbs.elki.visualization.VisualizationTask;
import de.lmu.ifi.dbs.elki.visualization.css.CSSClass;
import de.lmu.ifi.dbs.elki.visualization.css.CSSClassManager.CSSNamingConflict;
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.SVGSimpleLinearAxis;
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;
/**
* Generates a SVG-Element containing axes, including labeling.
*
* @author Remigius Wojdanowski
*
* @apiviz.uses SVGSimpleLinearAxis
*
* @param <NV> Type of the DatabaseObject being visualized.
*/
public class AxisVisualization<NV extends NumberVector<NV, ?>> extends P2DVisualization<NV> {
/**
* Constructor.
*
* @param task VisualizationTask
*/
public AxisVisualization(VisualizationTask task) {
super(task);
incrementalRedraw();
}
@Override
protected void redraw() {
int dim = DatabaseUtil.dimensionality(rel);
// origin
double[] orig = proj.fastProjectScaledToRender(new Vector(dim));
// diagonal point opposite to origin
double[] diag = new double[dim];
for(int d2 = 0; d2 < dim; d2++) {
diag[d2] = 1;
}
diag = proj.fastProjectScaledToRender(new Vector(diag));
// compute angle to diagonal line, used for axis labeling.
double diaga = Math.atan2(diag[1] - orig[1], diag[0] - orig[0]);
double alfontsize = 1.2 * context.getStyleLibrary().getTextSize(StyleLibrary.AXIS_LABEL);
CSSClass alcls = new CSSClass(svgp, "unmanaged");
alcls.setStatement(SVGConstants.CSS_FONT_SIZE_PROPERTY, SVGUtil.fmt(alfontsize));
alcls.setStatement(SVGConstants.CSS_FILL_PROPERTY, context.getStyleLibrary().getTextColor(StyleLibrary.AXIS_LABEL));
alcls.setStatement(SVGConstants.CSS_FONT_FAMILY_PROPERTY, context.getStyleLibrary().getFontFamily(StyleLibrary.AXIS_LABEL));
// draw axes
for(int d = 0; d < dim; d++) {
Vector v = new Vector(dim);
v.set(d, 1);
// projected endpoint of axis
double[] ax = proj.fastProjectScaledToRender(v);
boolean righthand = false;
double axa = Math.atan2(ax[1] - orig[1], ax[0] - orig[0]);
if(axa > diaga || (diaga > 0 && axa > diaga + Math.PI)) {
righthand = true;
}
// System.err.println(ax.get(0) + " "+ ax.get(1)+
// " "+(axa*180/Math.PI)+" "+(diaga*180/Math.PI));
if(ax[0] != orig[0] || ax[1] != orig[1]) {
try {
SVGSimpleLinearAxis.drawAxis(svgp, layer, proj.getScale(d), orig[0], orig[1], ax[0], ax[1], true, righthand, context.getStyleLibrary());
// TODO: move axis labeling into drawAxis function.
double offx = (righthand ? 1 : -1) * 0.02 * Projection.SCALE;
double offy = (righthand ? 1 : -1) * 0.02 * Projection.SCALE;
Element label = svgp.svgText(ax[0] + offx, ax[1] + offy, DatabaseUtil.getColumnLabel(rel, d + 1));
SVGUtil.setAtt(label, SVGConstants.SVG_STYLE_ATTRIBUTE, alcls.inlineCSS());
SVGUtil.setAtt(label, SVGConstants.SVG_TEXT_ANCHOR_ATTRIBUTE, righthand ? SVGConstants.SVG_START_VALUE : SVGConstants.SVG_END_VALUE);
layer.appendChild(label);
}
catch(CSSNamingConflict e) {
throw new RuntimeException("Conflict in CSS naming for axes.", e);
}
}
}
}
/**
* Factory for axis visualizations
*
* @author Erich Schubert
*
* @apiviz.stereotype factory
* @apiviz.uses AxisVisualization oneway - - «create»
*
* @param <NV>
*/
public static class Factory<NV extends NumberVector<NV, ?>> extends AbstractVisFactory {
/**
* A short name characterizing this Visualizer.
*/
private static final String NAME = "Axes";
/**
* Constructor, adhering to
* {@link de.lmu.ifi.dbs.elki.utilities.optionhandling.Parameterizable}
*/
public Factory() {
super();
}
@Override
public Visualization makeVisualization(VisualizationTask task) {
return new AxisVisualization<NV>(task);
}
@Override
public void processNewResult(HierarchicalResult baseResult, Result result) {
Iterator<ScatterPlotProjector<?>> ps = ResultUtil.filteredResults(result, ScatterPlotProjector.class);
for(ScatterPlotProjector<?> p : IterableUtil.fromIterator(ps)) {
final VisualizationTask task = new VisualizationTask(NAME, p, p.getRelation(), this);
task.put(VisualizationTask.META_LEVEL, VisualizationTask.LEVEL_BACKGROUND);
baseResult.getHierarchy().add(p, task);
}
}
@Override
public boolean allowThumbnails(VisualizationTask task) {
// Don't use thumbnails
return false;
}
}
}
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