y.layout.grouping
Class IsolatedGroupComponentLayouter

java.lang.Object
  |
  +--y.layout.AbstractLayoutStage
        |
        +--y.layout.ComponentLayouter
              |
              +--y.layout.grouping.IsolatedGroupComponentLayouter

All Implemented Interfaces:

Layouter, LayoutStage

public class IsolatedGroupComponentLayouter

extends ComponentLayouter

A special component layouter that handled hierarchically grouped graphs in a special way. Unlike ComponentLayouter this layout stage allows isolated subgraphs within a group to be laid as a separate component.

The orthogonal group layouter OrthogonalGroupLayouter uses this layout stage as compoennt layouter.

Field Summary

Fields inherited from interface y.layout.Layouter

EDGE_ID_DPKEY, NODE_ID_DPKEY, SELECTED_EDGES, SELECTED_NODES

Constructor Summary

IsolatedGroupComponentLayouter()
Create a new instance of IsolatedGroupComponentLayouter.

IsolatedGroupComponentLayouter(Layouter coreLayouter)
Create a new instance of IsolatedGroupComponentLayouter.

Method Summary

boolean	canLayout(LayoutGraph graph) Returns true, iff the coreLayouter returns true for all components of the graph.
void	doLayout(LayoutGraph graph) Calculate the layout.
protected int	findGraphComponents(LayoutGraph graph, NodeMap compNumber) Determines which nodes will belong to the same graph component.

Methods inherited from class y.layout.ComponentLayouter

arrangeComponentGraphs, getComponentSpacing, getGridSpacing, isGroupingActive, setComponentSpacing, setGridSpacing, setGroupingActive, setOrigin, setPreferredLayoutSize

Methods inherited from class y.layout.AbstractLayoutStage

canLayoutCore, doLayoutCore, getCoreLayouter, setCoreLayouter

Methods inherited from class java.lang.Object

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

Constructor Detail

IsolatedGroupComponentLayouter

public IsolatedGroupComponentLayouter(Layouter coreLayouter)

Create a new instance of IsolatedGroupComponentLayouter.

Parameters:

coreLayouter - the core layouter being invoked for each component of the graph.

IsolatedGroupComponentLayouter

public IsolatedGroupComponentLayouter()

Create a new instance of IsolatedGroupComponentLayouter.

Method Detail

canLayout

public boolean canLayout(LayoutGraph graph)

Returns true, iff the coreLayouter returns true for all components of the graph.

Specified by:

canLayout in interface Layouter

Overrides:

canLayout in class ComponentLayouter

findGraphComponents

protected int findGraphComponents(LayoutGraph graph,
                                  NodeMap compNumber)

Determines which nodes will belong to the same graph component. Unlike ComponentLayouter this implementation identifies isolated subgraphs within a group also as separate components.

Overrides:

findGraphComponents in class ComponentLayouter

Parameters:

graph - the input graph

compNumber - return value that will hold the zero-based number of the component that it belongs to. The component number of Node v is compNum.getInt().

Returns:

the number of connected components of this graph.

doLayout

public void doLayout(LayoutGraph graph)

Description copied from class: ComponentLayouter

Calculate the layout. This is done by decomposing the Graph in its connected components and applying the layout algorithm on them.

Specified by:

doLayout in interface Layouter

Overrides:

doLayout in class ComponentLayouter