Package com.macrofocus.treemap
Class PivotByAlgorithm
- java.lang.Object
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- com.macrofocus.treemap.AbstractAlgorithm
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- com.macrofocus.treemap.PivotByAlgorithm
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- All Implemented Interfaces:
Algorithm
public class PivotByAlgorithm extends AbstractAlgorithm
Implementation of the Pivot By algorithm. It is described described in: Ben Shneiderman and Martin Wattenberg. Ordered treemap layouts. IEEE Symposium on Information Visualization, 0:73, 2001. Complexity: O(n^2), where n is the number of nodes in the tree (depends on the pivot in use).
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
PivotByAlgorithm.Biggest
The pivot is taken to be the item with the largest area since the largest item is the most difficult to place.static class
PivotByAlgorithm.Middle
The pivot is taken to be the middle item of the list since this is more likely to create a balanced layout.static class
PivotByAlgorithm.SplitSize
Selects the pivot that will split L1 and L3 into approximately equal total areas.static interface
PivotByAlgorithm.Type
Strategy for determining the node to use as a pivot
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Constructor Summary
Constructors Constructor Description PivotByAlgorithm()
PivotByAlgorithm(PivotByAlgorithm.Type type)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
breadthFirstLayout(java.awt.Shape shape, MutableTreeMapNode parent, MutableTreeMapNode[] children, double sumSizes, int horizontalVanishingPoint, int verticalVanishingPoint, TreeMapWorker worker)
Arrange the items in the given array to fill the given shape.boolean
isCompatible(java.awt.Shape shape)
Indicates whether the layout algorithm can handle the given geometry of its parentjava.lang.String
toString()
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Methods inherited from class com.macrofocus.treemap.AbstractAlgorithm
depthFirstLayout, finishLayout, getProperties, isChildContained, isColorParent, isRenderingLeafLabelsSupported, isRenderingParentLabelSupported, isSpaceFilling, iterator, startLayout, sum
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Constructor Detail
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PivotByAlgorithm
public PivotByAlgorithm()
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PivotByAlgorithm
public PivotByAlgorithm(PivotByAlgorithm.Type type)
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Method Detail
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breadthFirstLayout
public boolean breadthFirstLayout(java.awt.Shape shape, MutableTreeMapNode parent, MutableTreeMapNode[] children, double sumSizes, int horizontalVanishingPoint, int verticalVanishingPoint, TreeMapWorker worker)
Arrange the items in the given array to fill the given shape. This is called during the first pass, while traversing the tree top down.- Parameters:
shape
- the current rectangle being divided.parent
- the parent node.children
- the items to map.sumSizes
- the size of the parent.worker
- the worker thread- Returns:
- true if the layout has been cancelled, false otherwise
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isCompatible
public boolean isCompatible(java.awt.Shape shape)
Description copied from interface:Algorithm
Indicates whether the layout algorithm can handle the given geometry of its parent- Parameters:
shape
- the geometry of its parent- Returns:
- true if it can lay out the children using the specified geometrical shape
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toString
public java.lang.String toString()
- Overrides:
toString
in classjava.lang.Object
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