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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.NumberVector;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
import de.lmu.ifi.dbs.elki.result.ResultUtil;
import de.lmu.ifi.dbs.elki.result.SamplingResult;
import de.lmu.ifi.dbs.elki.visualization.VisualizationItem;
import de.lmu.ifi.dbs.elki.visualization.VisualizationTask;
import de.lmu.ifi.dbs.elki.visualization.gui.VisualizationPlot;
import de.lmu.ifi.dbs.elki.visualization.projections.CanvasSize;
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.SVGPlot;
import de.lmu.ifi.dbs.elki.visualization.svg.SVGUtil;
import de.lmu.ifi.dbs.elki.visualization.visualizers.AbstractVisualization;
/**
* Default class to handle 2D projected visualizations.
*
* @author Erich Schubert
*
* @apiviz.landmark
* @apiviz.has Projection2D
*/
public abstract class AbstractScatterplotVisualization extends AbstractVisualization {
/**
* The current projection
*/
final protected Projection2D proj;
/**
* The representation we visualize
*/
final protected Relation<? extends NumberVector> rel;
/**
* The DBID sample
*/
final protected SamplingResult sample;
/**
* Constructor.
*
* @param task Visualization task
* @param plot Plot to draw to
* @param width Embedding width
* @param height Embedding height
* @param proj Projection
*/
public AbstractScatterplotVisualization(VisualizationTask task, VisualizationPlot plot, double width, double height, Projection proj) {
super(task, plot, width, height);
this.proj = (Projection2D) proj;
this.rel = task.getRelation();
this.sample = task.updateOnAny(VisualizationTask.ON_SAMPLE) ? ResultUtil.getSamplingResult(rel) : null;
}
/**
* Setup our canvas.
*
* @return Canvas
*/
protected Element setupCanvas() {
final double margin = context.getStyleLibrary().getSize(StyleLibrary.MARGIN);
this.layer = setupCanvas(svgp, this.proj, margin, getWidth(), getHeight());
return layer;
}
/**
* Utility function to setup a canvas element for the visualization.
*
* @param svgp Plot element
* @param proj Projection to use
* @param margin Margin to use
* @param width Width
* @param height Height
* @return wrapper element with appropriate view box.
*/
public static Element setupCanvas(SVGPlot svgp, Projection2D proj, double margin, double width, double height) {
final CanvasSize canvas = proj.estimateViewport();
final double sizex = canvas.getDiffX();
final double sizey = canvas.getDiffY();
String transform = SVGUtil.makeMarginTransform(width, height, sizex, sizey, margin) + " translate(" + SVGUtil.fmt(sizex * .5) + " " + SVGUtil.fmt(sizey * .5) + ")";
final Element layer = SVGUtil.svgElement(svgp.getDocument(), SVGConstants.SVG_G_TAG);
SVGUtil.setAtt(layer, SVGConstants.SVG_TRANSFORM_ATTRIBUTE, transform);
return layer;
}
@Override
public void visualizationChanged(VisualizationItem item) {
super.visualizationChanged(item);
if(item == proj) {
svgp.requestRedraw(this.task, this);
return;
}
}
}
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