cern.extjfx.chart.data

Class DefaultDataReducer<X extends Number,Y extends Number>

java.lang.Object

cern.extjfx.chart.data.DefaultDataReducer<X,Y>

Type Parameters:

X - type of X values

Y - type of Y values

All Implemented Interfaces:

DataReducer<X,Y>

public final class DefaultDataReducer<X extends Number,Y extends Number>
extends Object
implements DataReducer<X,Y>

DataReducer implementation based on a modified version of Ramer-Douglas-Peucker algorithm.

Compared to the original algorithm that removes points that don't introduce error bigger than given tolerance, this implementation takes as argument the desired number of points, removing from the curve the points in the order of error size introduced i.e. points whose removal introduces smallest error are removed first. The algorithm stops once the curve has the desired number of points.

Constructor Summary

Constructors

Constructor and Description
DefaultDataReducer()

Method Summary

Modifier and Type	Method and Description
List<XYChart.Data<X,Y>>	reduce(ChartData<X,Y> data, Range<Double> dataRange, int maxPointsCount) Reduces the number of data points to be equal or less than specified maxPointsCount.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultDataReducer

public DefaultDataReducer()

Method Detail

reduce

public List<XYChart.Data<X,Y>> reduce(ChartData<X,Y> data,
                                      Range<Double> dataRange,
                                      int maxPointsCount)

Description copied from interface: DataReducer

Reduces the number of data points to be equal or less than specified maxPointsCount.

Specified by:

reduce in interface DataReducer<X extends Number,Y extends Number>

Parameters:

data - data to be reduced

dataRange - range of data (lowerBound and upperBound) from which given data should be reduced

maxPointsCount - the maximum number of points that the reduced list should contain

Returns:

list containing reduced data, with maximum maxPointsCount elements