edu.uci.ics.jung.visualization.layout.LayoutAlgorithmTransition Maven / Gradle / Ivy

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package edu.uci.ics.jung.visualization.layout;

import edu.uci.ics.jung.layout.algorithms.LayoutAlgorithm;
import edu.uci.ics.jung.layout.model.LayoutModel;
import edu.uci.ics.jung.visualization.VisualizationServer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Manages the transition to a new LayoutAlgorithm. The transition can me animated or immediate. The
 * view side has a reference to the VisualizationServer so that it can manage activity of the
 * Spatial structures during the transition. Typically, they are turned off until the transition is
 * complete to minimize unnecessary work.
 *
 * @param 
 * @param 
 */
public class LayoutAlgorithmTransition {

  private static Logger log = LoggerFactory.getLogger(LayoutAlgorithmTransition.class);

  public static  void animate(
      VisualizationServer visualizationServer, LayoutAlgorithm endLayoutAlgorithm) {
    fireLayoutStateChanged(visualizationServer.getModel().getLayoutModel(), true);
    LayoutAlgorithm transitionLayoutAlgorithm =
        new AnimationLayoutAlgorithm<>(visualizationServer, endLayoutAlgorithm);
    visualizationServer.getModel().setLayoutAlgorithm(transitionLayoutAlgorithm);
  }

  public static  void apply(
      VisualizationServer visualizationServer, LayoutAlgorithm endLayoutAlgorithm) {
    visualizationServer.getModel().setLayoutAlgorithm(endLayoutAlgorithm);
  }

  private static void fireLayoutStateChanged(LayoutModel layoutModel, boolean state) {
    log.trace("fireLayoutStateChanged to {}", state);
    layoutModel.getLayoutStateChangeSupport().fireLayoutStateChanged(layoutModel, state);
  }
}