Android Open Source - geoar-app Mean Sensor Buffer

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License

The source code is released under:

Apache License

Java Source Code

/**
 * Copyright 2012 52North Initiative for Geospatial Open Source Software GmbH
 */*  w  w w.  ja  v a  2  s  .c o  m*/
 * 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.
 */
package org.n52.geoar.tracking.location;


/**
 * A simple mean filter for sensor data
 * 
 * @author Holger Hopmann
 * 
 */
public class MeanSensorBuffer extends SensorBuffer {
  private int size;
  private int nextIndex = 0;
  private boolean hasValues = false;
  private float[] buffer;

  public MeanSensorBuffer(int dataLength, int size) {
    super(dataLength);
    buffer = new float[size * dataLength];
    this.size = size;
  }

  public void put(float[] sensordata) {
    System.arraycopy(sensordata, 0, buffer, nextIndex * dataLength,
        dataLength);
    nextIndex = (nextIndex + 1) % size;
    if (!hasValues && nextIndex == 0) {
      hasValues = true;
    }
  }

  public float[] get() {
    float[] sum = new float[dataLength];
    if (!hasValues) {
      // Nullvektor zur?ckgeben
      return sum;
    }
    for (int i = 0; i < size; i++) {
      for (int j = 0; j < dataLength; j++) {
        sum[j] += buffer[i * dataLength + j];
      }
    }

    for (int j = 0; j < dataLength; j++) {
      sum[j] = sum[j] / size;
    }
    return sum;
  }

  public boolean hasValues() {
    return hasValues;
  }
}

Java Source Code List

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