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.
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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
Fields Modifier and Type Field Description (package private) int
COOL_DOWN_INCREMENTS
(package private) static int
graphHeight
(package private) int
incrementsLeft
(package private) double
LEVELATTRACTIONRATE
(package private) double
meanSquareVel
private java.util.Map<V,java.lang.Number>
minLevels
Each vertex has a minimumLevel.(package private) double
MSV_THRESHOLD
A bunch of parameters to help work out when to stop quivering.(package private) static int
numRoots
(package private) double
SPACEFACTOR
(package private) boolean
stoppingIncrements
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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.private void
initializeLocation(V v, java.awt.geom.Point2D coord, java.awt.Dimension d)
Sets a random location for a vertex within the dimensions of the space.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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Field Detail
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minLevels
private java.util.Map<V,java.lang.Number> minLevels
Each vertex has a minimumLevel. Any vertex with no successors has minimumLevel of zero. The minimumLevel of any vertex must be strictly greater than the minimumLevel of its parents. (Vertex A is a parent of Vertex B iff there is an edge from B to A.) Typically, a vertex will have a minimumLevel which is one greater than the minimumLevel of its parent's. However, if the vertex has two parents, its minimumLevel will be one greater than the maximum of the parents'. We need to calculate the minimumLevel for each vertex. When we layout the graph, vertices cannot be drawn any higher than the minimumLevel. The graphHeight of a graph is the greatest minimumLevel that is used. We will modify the SpringLayout calculations so that nodes cannot move above their assigned minimumLevel.
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graphHeight
static int graphHeight
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numRoots
static int numRoots
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SPACEFACTOR
final double SPACEFACTOR
- See Also:
- Constant Field Values
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LEVELATTRACTIONRATE
final double LEVELATTRACTIONRATE
- See Also:
- Constant Field Values
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MSV_THRESHOLD
final double MSV_THRESHOLD
A bunch of parameters to help work out when to stop quivering. If the MeanSquareVel(ocity) ever gets below the MSV_THRESHOLD, then we will start a final cool-down phase of COOL_DOWN_INCREMENT increments. If the MeanSquareVel ever exceeds the threshold, we will exit the cool down phase, and continue looking for another opportunity.- See Also:
- Constant Field Values
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meanSquareVel
double meanSquareVel
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stoppingIncrements
boolean stoppingIncrements
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incrementsLeft
int incrementsLeft
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COOL_DOWN_INCREMENTS
final int COOL_DOWN_INCREMENTS
- See Also:
- Constant Field Values
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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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initializeLocation
private void initializeLocation(V v, java.awt.geom.Point2D coord, java.awt.Dimension d)
Sets a random location for a vertex within the dimensions of the space.- Parameters:
v
- the vertex whose position is to be setcoord
- the coordinates of the vertex once the position has been setd
- the dimensions of the space
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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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