EqualAreaFunction (Geotools modules 31-SNAPSHOT API)

Object
- ExpressionAbstract
- - DefaultExpression
  - - ClassificationFunction
    - - AbstractQuantityClassificationFunction
      - EqualAreaFunction

All Implemented Interfaces:

Expression, Function, FunctionExpression, Factory
```
public class EqualAreaFunction
extends AbstractQuantityClassificationFunction
```
Breaks a SimpleFeatureCollection into classes with (roughtly) equal total items area in each class

Author:

Andrea Aime - GeoSolutions

Field Summary

Fields
Modifier and Type Field Description

static FunctionName NAME
- Fields inherited from class ClassificationFunction
  LOGGER
- Fields inherited from interface Expression
  NIL

Constructor Summary

Constructors
Constructor Description

EqualAreaFunction()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static Function`	`getCartesianAreaFunction()`	The default area is computed as a cartesian area of the data (will work reasonably on geodetic dataset over small areas, but won't work properly over large areas) However, it is to be remembered that these classification functions are trying to get a certain evennes on the display, so if the display is in plate caree, then computing area over lon/lat is actually the right thing to do.
`protected FeatureCalc`	`getListVisitor()`	Returns the list visitor for the specific implementation of "quantity" (e.g., count, area, ...).
`protected boolean`	`percentages()`

Methods inherited from class AbstractQuantityClassificationFunction
evaluate

Methods inherited from class ClassificationFunction
accept, computeGroupByPercentages, computePercentage, decimalPlaces, fixRound, getClasses, getFallbackValue, getFunctionName, getImplementationHints, getName, getParameters, getProgressListener, round, setClasses, setFallbackValue, setParameters, setProgressListener, toString

Methods inherited from class DefaultExpression
isAttributeExpression, isExpression, isFunctionExpression, isGeometryExpression, isLiteralExpression, isMathExpression

Methods inherited from class ExpressionAbstract
evaluate

Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface Expression
evaluate

- Field Detail
  - NAME
```
public static FunctionName NAME
```
- Constructor Detail
  - EqualAreaFunction
```
public EqualAreaFunction()
```
- Method Detail
  - getCartesianAreaFunction
```
public static Function getCartesianAreaFunction()
```
    The default area is computed as a cartesian area of the data (will work reasonably on geodetic dataset over small areas, but won't work properly over large areas) However, it is to be remembered that these classification functions are trying to get a certain evennes on the display, so if the display is in plate caree, then computing area over lon/lat is actually the right thing to do.
  - getListVisitor
```
protected FeatureCalc getListVisitor()
```
    Description copied from class: AbstractQuantityClassificationFunction
    
    Returns the list visitor for the specific implementation of "quantity" (e.g., count, area, ...). The visitor must return a "bins" structure matching {code}List[]{code}, where each array entry is a bin, and values inside the bin are sorted from lowest to highest
    
    Specified by:
    
    getListVisitor in class AbstractQuantityClassificationFunction
  - percentages
```
protected boolean percentages()
```
    Specified by:
    
    percentages in class AbstractQuantityClassificationFunction
    
    Returns:
    
    true if percentages computation is enabled, false if not