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package de.lmu.ifi.dbs.elki.visualization.visualizers.thumbs;
/*
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.io.File;
import java.io.IOException;
import de.lmu.ifi.dbs.elki.logging.LoggingUtil;
import de.lmu.ifi.dbs.elki.visualization.svg.SVGPlot;
/**
* Class that will render a {@link SVGPlot} into a {@link File} as thumbnail.
*
* Note: this does not happen in the background - call it from your own Thread if you need that!
*
* @author Erich Schubert
*
* @apiviz.uses SVGPlot oneway - - renders
* @apiviz.has File oneway - - «create»
*/
public class Thumbnailer {
/**
* Default prefix
*/
private static final String DEFAULT_PREFIX = "elki-";
/**
* Prefix storage.
*/
private String prefix;
/**
* Constructor
* @param prefix Filename prefix to avoid collisions (e.g "elki-")
*/
public Thumbnailer(String prefix) {
this.prefix = prefix;
}
/**
* Constructor
*/
public Thumbnailer() {
this(DEFAULT_PREFIX);
}
/**
* Generate a thumbnail for a given plot.
*
* @param plot Plot to use
* @param thumbwidth Width of the thumbnail
* @param thumbheight height of the thumbnail
* @return File object of the thumbnail, which has deleteOnExit set.
*/
public synchronized File thumbnail(SVGPlot plot, int thumbwidth, int thumbheight) {
File temp = null;
try {
temp = File.createTempFile(prefix, ".png");
temp.deleteOnExit();
plot.saveAsPNG(temp, thumbwidth, thumbheight);
}
catch(org.apache.batik.bridge.BridgeException e) {
plot.dumpDebugFile();
LoggingUtil.exception("Exception rendering thumbnail: ", e);
}
catch(org.apache.batik.transcoder.TranscoderException e) {
plot.dumpDebugFile();
LoggingUtil.exception("Exception rendering thumbnail: ", e);
}
catch(IOException e) {
LoggingUtil.exception(e);
}
return temp;
}
}
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