prefuse.action.layout.graph
Class BalloonTreeLayout

java.lang.Object
  prefuse.activity.Activity
      prefuse.action.Action
          prefuse.action.GroupAction
              prefuse.action.layout.Layout
                  prefuse.action.layout.graph.TreeLayout
                      prefuse.action.layout.graph.BalloonTreeLayout

public class BalloonTreeLayout
extends TreeLayout

Layout that computes a circular "balloon-tree" layout of a tree. This layout places children nodes radially around their parents, and is equivalent to a top-down flattened view of a ConeTree.

The algorithm used is that of G. Melançon and I. Herman from their research paper Circular Drawings of Rooted Trees, Reports of the Centre for Mathematics and Computer Sciences, Report Number INS–9817, 1998.

Author:

jeffrey heer

Nested Class Summary

static class

BalloonTreeLayout.Params Wrapper class holding parameters used for each node in this layout.

Field Summary

static java.lang.String	PARAMS The data field in which the parameters used by this layout are stored.
static Schema	PARAMS_SCHEMA The schema for the parameters used by this layout.

Fields inherited from class prefuse.action.layout.graph.TreeLayout

m_root

Fields inherited from class prefuse.action.layout.Layout

m_anchor, m_bounds, m_bpts, m_insets, m_margin, m_tmpa, m_tmpb

Fields inherited from class prefuse.action.GroupAction

m_group

Fields inherited from class prefuse.action.Action

m_vis

Fields inherited from class prefuse.activity.Activity

DEFAULT_STEP_TIME, INFINITY

Constructor Summary

BalloonTreeLayout(java.lang.String group)
Create a new BalloonTreeLayout

BalloonTreeLayout(java.lang.String group, int minRadius)
Create a new BalloonTreeLayout

Method Summary

int	getMinRadius() Get the minimum radius used for a layout circle.
void	run(double frac) Runs this Action, triggering whatever processing this Action performs.
void	setMinRadius(int minRadius) Set the minimum radius used for a layout circle.

Methods inherited from class prefuse.action.layout.graph.TreeLayout

getLayoutRoot, setLayoutRoot

Methods inherited from class prefuse.action.layout.Layout

getLayoutAnchor, getLayoutBounds, setLayoutAnchor, setLayoutBounds, setMargin, setX, setY

Methods inherited from class prefuse.action.GroupAction

getGroup, setGroup

Methods inherited from class prefuse.action.Action

getVisualization, run, setVisualization

Methods inherited from class prefuse.activity.Activity

addActivityListener, alwaysRunAfter, cancel, fireActivityCancelled, fireActivityFinished, fireActivityScheduled, fireActivityStarted, fireActivityStepped, getDuration, getNextTime, getPace, getPacingFunction, getStartTime, getStepTime, getStopTime, isEnabled, isRunning, isScheduled, removeActivityListener, run, runAfter, runAt, setDuration, setEnabled, setPacingFunction, setStartTime, setStepTime

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

PARAMS

public static final java.lang.String PARAMS

The data field in which the parameters used by this layout are stored.

See Also:

Constant Field Values

PARAMS_SCHEMA

public static final Schema PARAMS_SCHEMA

The schema for the parameters used by this layout.

Constructor Detail

BalloonTreeLayout

public BalloonTreeLayout(java.lang.String group)

Create a new BalloonTreeLayout

Parameters:

group - the data group to layout. Must resolve to a Graph or Tree instance.

BalloonTreeLayout

public BalloonTreeLayout(java.lang.String group,
                         int minRadius)

Create a new BalloonTreeLayout

Parameters:

group - the data group to layout. Must resolve to a Graph or Tree instance.

minRadius - the minimum radius to use for a layout circle

Method Detail

getMinRadius

public int getMinRadius()

Get the minimum radius used for a layout circle.

Returns:

the minimum layout radius

setMinRadius

public void setMinRadius(int minRadius)

Set the minimum radius used for a layout circle.

Parameters:

minRadius - the minimum layout radius

run

public void run(double frac)

Description copied from class: Action

Runs this Action, triggering whatever processing this Action performs. Subclass this method to create custom Actions.

Specified by:

run in class GroupAction

Parameters:

frac - the fraction of this Action's duration that has elapsed.

See Also:

Action.run(double)