Android Open Source - droidengine2d Sensor Utilities

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License

The source code is released under:

Apache License

Java Source Code

/*   Copyright 2013-2014 Miguel Vicente Linares
 */* w  ww.  ja  v a2  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 com.miviclin.droidengine2d.input.sensor;

/**
 * SensorUtilities.
 * 
 * @author Miguel Vicente Linares
 * 
 */
public class SensorUtilities {

  /**
   * Applies a low pass filter to the specified vector in order to attenuate the input values using the output values
   * and alpha.
   * 
   * @param input Input values (can not be null).
   * @param output Output values (can not be null). These values will be modified by the filter.
   * @param length Number of values to attenuate.
   * @param alpha Attenuation coefficient (value between 0.0f and 1.0f).
   */
  public static void lowPassFilter(float[] input, float[] output, int length, float alpha) {
    if (input == null) {
      throw new IllegalArgumentException("input can not be null");
    }
    if (output == null) {
      throw new IllegalArgumentException("output can not be null");
    }
    if (length > Math.min(input.length, output.length)) {
      throw new IllegalArgumentException("The specified length is too big");
    }
    if (alpha < 0 || alpha > 1) {
      throw new IllegalArgumentException("alpha must be a value between 0 and 1");
    }
    for (int i = 0; i < length; i++) {
      output[i] += (alpha * (input[i] - output[i]));
    }
  }

}

Java Source Code List

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