lejos.robotics.filter

Class SumFilter

java.lang.Object

lejos.robotics.filter.AbstractFilter

lejos.robotics.filter.SumFilter

All Implemented Interfaces:

SampleProvider

Direct Known Subclasses:

MeanFilter

public class SumFilter
extends AbstractFilter

This filter returns the sum of the N most recent samples.
The number of samples used is specified in the constructor of the filter.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private class	SumFilter.PlainSum Calculates the sum by adding all the elements in the array every time
private class	SumFilter.SmartSum Calculates the sum by maintaining a sum by substracting old samples and adding new samples;

Field Summary

Fields

Modifier and Type	Field and Description
private SampleBuffer	worker

Fields inherited from class lejos.robotics.filter.AbstractFilter

sampleSize, source

Constructor Summary

Constructors

Constructor and Description
SumFilter(SampleProvider source, int length)

Method Summary

Modifier and Type	Method and Description
void	fetchSample(float[] sample, int offset) Fetches a sample from a sensors or filter.
protected int	getActualSize()

Methods inherited from class lejos.robotics.filter.AbstractFilter

sampleSize

Methods inherited from class java.lang.Object

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

Field Detail

worker

private SampleBuffer worker

Constructor Detail

SumFilter

public SumFilter(SampleProvider source,
                 int length)

Method Detail

fetchSample

public void fetchSample(float[] sample,
                        int offset)

Description copied from interface: SampleProvider

Fetches a sample from a sensors or filter.

Specified by:

fetchSample in interface SampleProvider

Overrides:

fetchSample in class AbstractFilter

Parameters:

sample - The array to store the sample in.

offset - The elements of the sample are stored in the array starting at the offset position.

getActualSize

protected int getActualSize()