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package de.lmu.ifi.dbs.elki.visualization.gui;
/*
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 java.util.concurrent.ConcurrentLinkedDeque;
import de.lmu.ifi.dbs.elki.visualization.VisualizationTask;
import de.lmu.ifi.dbs.elki.visualization.svg.SVGPlot;
import de.lmu.ifi.dbs.elki.visualization.visualizers.Visualization;
/**
* SVG plot that allows visualization to schedule updates.
*
* @author Erich Schubert
* @since 0.7.0
*/
public class VisualizationPlot extends SVGPlot {
/**
* Pending redraw request in Batik.
*/
protected Runnable pendingRedraw = null;
/**
* Update queue.
*/
protected ConcurrentLinkedDeque<Visualization> updateQueue = new ConcurrentLinkedDeque<>();
/**
* Trigger a redraw, but avoid excessive redraws.
*/
protected final void synchronizedRedraw() {
Runnable pr = new Runnable() {
@Override
public void run() {
if(VisualizationPlot.this.pendingRedraw == this) {
VisualizationPlot.this.pendingRedraw = null;
VisualizationPlot.this.redraw();
}
}
};
pendingRedraw = pr;
scheduleUpdate(pr);
}
/**
* Redraw all pending updates.
*/
protected void redraw() {
while(!updateQueue.isEmpty()) {
Visualization vis = updateQueue.pop();
vis.incrementalRedraw();
}
}
/**
* Request a redraw of a visualization.
*/
public void requestRedraw(VisualizationTask task, Visualization vis) {
updateQueue.add(vis);
synchronizedRedraw();
}
}
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