salvo.jesus.graph.visual.layout

Class RadialTreeLayout

java.lang.Object

salvo.jesus.graph.visual.layout.RadialTreeLayout

All Implemented Interfaces:

Serializable, Visitor, GraphLayoutManager

public class RadialTreeLayout
extends Object
implements GraphLayoutManager, Visitor

An implementation of a radial tree layout drawing, as described on page 52 of the book "Graph Drawing".

Version:

$Id: RadialTreeLayout.java,v 1.2 2002/09/11 12:30:49 jmsalvo Exp $

Author:

Jesus M. Salvo Jr.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
RadialTreeLayout(VisualGraph vGraph)

Method Summary

Modifier and Type	Method and Description
void	addEdge(VisualEdge vEdge) Automatically called when a VisualEdge object has been added to the VisualGraph object being laid out.
void	addVertex(VisualVertex vVertex) Automatically called when a VisualVertex object has been added to the VisualGraph object being laid out.
void	drawLayout() This method is called to actually paint or draw the layout of the graph.
boolean	isInitialized() Determines if the graph has been initially laid out.
void	layout() This method is called to layout the vertices in the graph, without actually drawing the finished or intermediate layout.
void	removeEdge(VisualEdge vEdge) Automatically called when a VisualEdge object is about to be removed from the VisualGraph object being laid out.
void	removeVertex(VisualVertex vVertex) Automatically called when a VisualVertex object is about to be removed from the VisualGraph object being laid out.
void	routeEdge(Graphics2D g2d, VisualEdge vEdge) Automatically called when a VisualEdge object needs to be drawn.
boolean	visit(Vertex vertexToVisit) Implementation of the visit() method of the Visitor interface.

Methods inherited from class java.lang.Object

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

Constructor Detail

RadialTreeLayout

public RadialTreeLayout(VisualGraph vGraph)

Method Detail

isInitialized

public boolean isInitialized()

Determines if the graph has been initially laid out. This method should be called prior to any painting to be done by the graph layout manager, as most internal variables are only initialized during layout.

Specified by:

isInitialized in interface GraphLayoutManager

Returns:

True if the graph has at least been laid out once.

layout

public void layout()

Description copied from interface: GraphLayoutManager

This method is called to layout the vertices in the graph, without actually drawing the finished or intermediate layout.

Specified by:

layout in interface GraphLayoutManager

visit

public boolean visit(Vertex vertexToVisit)

Implementation of the visit() method of the Visitor interface.

Specified by:

visit in interface Visitor

addVertex

public void addVertex(VisualVertex vVertex)

Description copied from interface: GraphLayoutManager

Automatically called when a VisualVertex object has been added to the VisualGraph object being laid out.

Specified by:

addVertex in interface GraphLayoutManager

Parameters:

vVertex - The newly added VisualVertex object.

removeEdge

public void removeEdge(VisualEdge vEdge)

Description copied from interface: GraphLayoutManager

Automatically called when a VisualEdge object is about to be removed from the VisualGraph object being laid out.

Specified by:

removeEdge in interface GraphLayoutManager

Parameters:

vEdge - The VisualEdge object to be removed

removeVertex

public void removeVertex(VisualVertex vVertex)

Description copied from interface: GraphLayoutManager

Automatically called when a VisualVertex object is about to be removed from the VisualGraph object being laid out.

Specified by:

removeVertex in interface GraphLayoutManager

Parameters:

vVertex - The VisualVertex object to be removed.

addEdge

public void addEdge(VisualEdge vEdge)

Description copied from interface: GraphLayoutManager

Automatically called when a VisualEdge object has been added to the VisualGraph object being laid out.

Specified by:

addEdge in interface GraphLayoutManager

Parameters:

vEdge - The newly added VisualEdge object.

routeEdge

public void routeEdge(Graphics2D g2d,
                      VisualEdge vEdge)

Description copied from interface: GraphLayoutManager

Automatically called when a VisualEdge object needs to be drawn. This method is typically called from VisualEdgePainterImpl when the VisualGraph encapsulating the VisualEdge has a GraphLayoutManager set. Prior to calling this method, the GeneralPath of the VisualEdge is reset.

Implementations of this method should set the segments of the VisualEdge's GeneralPath by calling the methods moveTo(), lineTo(), curveTo(), and quadTo().

Specified by:

routeEdge in interface GraphLayoutManager

Parameters:

g2d - The Graphics2D object used for painting

drawLayout

public void drawLayout()

Description copied from interface: GraphLayoutManager

This method is called to actually paint or draw the layout of the graph. This method should only be called after at least one call to layout().

Specified by:

drawLayout in interface GraphLayoutManager