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/*
* Copyright (C) 2015-2017 S.Violet
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Project GitHub: https://github.com/shepherdviolet/thistle
* Email: [email protected]
*/
package sviolet.thistle.model.math;
/**
* Float平均值
*
* 记录最近sampleSize次数据样本，并输出平均值
*
* @author S.Violet
*
*/
public class AverageFloat {
/**
* 样本数据
*/
private float[] sample;
/**
* 当前写入位置
*/
private int offset;
/**
* 样本容器是否填满
*/
private boolean full;
/**
*
* 无填充，起始样本数小于容器大小
*
* @param sampleSize 样本容器大小
*/
public AverageFloat(int sampleSize){
sample = new float[sampleSize];
offset = 0;
full = false;
}
/**
*
* 用padding值填充满样本容器
*
* @param sampleSize 样本容器大小
* @param padding 样本容器填充数据
*/
public AverageFloat(int sampleSize, float padding){
this(sampleSize);
for(int i = 0 ; i < sample.length ; i++){
sample[i] = padding;
}
full = true;
}
/**
* 采样（记录一条数据）
*
* @param data
* @return 返回当前平均值
*/
public float sampling(float data){
sample[offset] = data;
offset++;
if(offset >= sample.length){
full = true;
offset = 0;
}
return getAverage();
}
/**
* 返回当前平均值
*/
public float getAverage(){
if(full){
float sum = 0;
for(int i = 0 ; i < sample.length ; i++){
sum += sample[i];
}
return sum / sample.length;
}else{
float sum = 0;
for(int i = 0 ; i < offset ; i++){
sum += sample[i];
}
return sum / offset;
}
}
}