package prefuse.action.animate;
import java.util.Iterator;
import prefuse.action.GroupAction;
import prefuse.util.ColorLib;
import prefuse.visual.VisualItem;
import prefuse.visual.expression.StartVisiblePredicate;
/**
* Animator that interpolates the visibility status of VisualItems. Items
* not currently visible but with end visibilty true are faded in, while
* items currently visible but with end visibility false are faded out and
* finally set to not visible.
*
* @author <a href="http://jheer.org">jeffrey heer</a>
*/
public class VisibilityAnimator extends GroupAction {
/**
* Create a new VisibilityAnimator that processes all data groups.
*/
public VisibilityAnimator() {
super();
}
/**
* Create a new VisibilityAnimator that processes the specified group.
* @param group the data group to process.
*/
public VisibilityAnimator(String group) {
super(group);
}
/**
* @see prefuse.action.GroupAction#run(double)
*/
public void run(double frac) {
if ( frac == 0.0 ) {
setup();
} else if ( frac == 1.0 ) {
finish();
}
}
private void setup() {
// handle fade-in nodes
Iterator items = m_vis.visibleItems(m_group);
while ( items.hasNext() ) {
VisualItem item = (VisualItem) items.next();
if ( !item.isStartVisible() ) {
item.setStartFillColor(
ColorLib.setAlpha(item.getEndFillColor(),0));
item.setStartStrokeColor(
ColorLib.setAlpha(item.getEndStrokeColor(),0));
item.setStartTextColor(
ColorLib.setAlpha(item.getEndTextColor(),0));
}
}
// handle fade-out nodes
items = m_vis.items(m_group, StartVisiblePredicate.TRUE);
while ( items.hasNext() ) {
VisualItem item = (VisualItem) items.next();
if ( !item.isEndVisible() ) {
// fade-out case
item.setVisible(true);
item.setEndFillColor(
ColorLib.setAlpha(item.getStartFillColor(),0));
item.setEndStrokeColor(
ColorLib.setAlpha(item.getStartStrokeColor(),0));
item.setEndTextColor(
ColorLib.setAlpha(item.getStartTextColor(),0));
}
}
}
private void finish() {
// set faded-out nodes to permanently invisible
Iterator items = m_vis.items(m_group, StartVisiblePredicate.TRUE);
while ( items.hasNext() ) {
VisualItem item = (VisualItem) items.next();
if ( !item.isEndVisible() ) {
item.setVisible(false);
item.setStartVisible(false);
}
}
// set faded-in nodes to permanently visible
items = m_vis.visibleItems(m_group);
while ( items.hasNext() ) {
VisualItem item = (VisualItem) items.next();
if ( !item.isStartVisible() ) {
item.setStartVisible(true);
item.setStartFillColor(item.getEndFillColor());
item.setStartTextColor(item.getEndTextColor());
item.setStartStrokeColor(item.getEndStrokeColor());
}
}
}
} // end of class VisibilityAnimator