Class DAGLayout<V,E>
- java.lang.Object
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- edu.uci.ics.jung.algorithms.layout.AbstractLayout<V,E>
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- edu.uci.ics.jung.algorithms.layout.SpringLayout<V,E>
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- edu.uci.ics.jung.algorithms.layout.DAGLayout<V,E>
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- All Implemented Interfaces:
com.google.common.base.Function<V,java.awt.geom.Point2D>
,Layout<V,E>
,IterativeContext
,java.util.function.Function<V,java.awt.geom.Point2D>
public class DAGLayout<V,E> extends SpringLayout<V,E>
An implementation ofLayout
suitable for tree-like directed acyclic graphs. Parts of it will probably not terminate if the graph is cyclic! The layout will result in directed edges pointing generally upwards. Any vertices with no successors are considered to be level 0, and tend towards the top of the layout. Any vertex has a level one greater than the maximum level of all its successors.- Author:
- John Yesberg
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Nested Class Summary
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Nested classes/interfaces inherited from class edu.uci.ics.jung.algorithms.layout.SpringLayout
SpringLayout.SpringDimensionChecker, SpringLayout.SpringVertexData
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Field Summary
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Fields inherited from class edu.uci.ics.jung.algorithms.layout.SpringLayout
force_multiplier, lengthFunction, repulsion_range_sq, springVertexData, stretch
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Fields inherited from class edu.uci.ics.jung.algorithms.layout.AbstractLayout
graph, initialized, locations, size
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
done()
Override incrementsAreDone so that we can eventually stop.void
initialize()
Had to override this one as well, to ensure that setRoot() is called.protected void
moveNodes()
Override the moveNodes() method from SpringLayout.void
propagateMinimumLevel(V v)
A recursive method for allocating the level for each vertex.protected void
relaxEdges()
Overridden relaxEdges.void
setLocation(V picked, double x, double y)
Override forceMove so that if someone moves a node, we can re-layout everything.void
setLocation(V picked, java.awt.geom.Point2D p)
Override forceMove so that if someone moves a node, we can re-layout everything.void
setRoot()
Calculates the level of each vertex in the graph.void
setRoot(V v)
Set vertex v to be level 0.void
setSize(java.awt.Dimension size)
When a visualization is resized, it presumably wants to fix the locations of the vertices and possibly to reinitialize its data.-
Methods inherited from class edu.uci.ics.jung.algorithms.layout.SpringLayout
calculateRepulsion, getForceMultiplier, getRepulsionRange, getStretch, isIncremental, reset, setForceMultiplier, setRepulsionRange, setStretch, step
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Methods inherited from class edu.uci.ics.jung.algorithms.layout.AbstractLayout
apply, getGraph, getSize, getX, getY, isLocked, lock, lock, offsetVertex, setGraph, setInitializer
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Method Detail
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setRoot
public void setRoot()
Calculates the level of each vertex in the graph. Level 0 is allocated to each vertex with no successors. Level n+1 is allocated to any vertex whose successors' maximum level is n.
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setRoot
public void setRoot(V v)
Set vertex v to be level 0.- Parameters:
v
- the vertex to set as root
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propagateMinimumLevel
public void propagateMinimumLevel(V v)
A recursive method for allocating the level for each vertex. Ensures that all predecessors of v have a level which is at least one greater than the level of v.- Parameters:
v
- the vertex whose minimum level is to be calculated
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setSize
public void setSize(java.awt.Dimension size)
Description copied from class:AbstractLayout
When a visualization is resized, it presumably wants to fix the locations of the vertices and possibly to reinitialize its data. The current method calls initializeLocations followed by initialize_local.
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initialize
public void initialize()
Had to override this one as well, to ensure that setRoot() is called.- Specified by:
initialize
in interfaceLayout<V,E>
- Overrides:
initialize
in classSpringLayout<V,E>
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moveNodes
protected void moveNodes()
Override the moveNodes() method from SpringLayout. The only change we need to make is to make sure that nodes don't float higher than the minY coordinate, as calculated by their minimumLevel.- Overrides:
moveNodes
in classSpringLayout<V,E>
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done
public boolean done()
Override incrementsAreDone so that we can eventually stop.- Specified by:
done
in interfaceIterativeContext
- Overrides:
done
in classSpringLayout<V,E>
- Returns:
- false
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setLocation
public void setLocation(V picked, double x, double y)
Override forceMove so that if someone moves a node, we can re-layout everything.- Overrides:
setLocation
in classAbstractLayout<V,E>
- Parameters:
picked
- the vertex whose location is to be setx
- the x coordinate of the location to sety
- the y coordinate of the location to set
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setLocation
public void setLocation(V picked, java.awt.geom.Point2D p)
Override forceMove so that if someone moves a node, we can re-layout everything.- Specified by:
setLocation
in interfaceLayout<V,E>
- Overrides:
setLocation
in classAbstractLayout<V,E>
- Parameters:
picked
- the vertex whose location is to be setp
- the location to set
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relaxEdges
protected void relaxEdges()
Overridden relaxEdges. This one reduces the effect of edges between greatly different levels.- Overrides:
relaxEdges
in classSpringLayout<V,E>
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