CalibrationHelper.java

/**
 AirCasting - Share your Air!
 Copyright (C) 2011-2012 HabitatMap, Inc.

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.

 You can contact the authors by email at <info@habitatmap.org>
 */
package pl.llp.aircasting.helper;

import com.google.inject.Inject;

import static pl.llp.aircasting.util.Projection.project;

public class CalibrationHelper
{
  public static final int OFFSET_POINT = 60;

  @Inject SettingsHelper settingsHelper;

  public double calibrate(double value)
  {
    int calibration = settingsHelper.getCalibration();
    int offset60DB = settingsHelper.getOffset60DB();

    return calibrate(value, calibration, offset60DB);
  }

  public double calibrate(double value, int calibration, int offset60DB)
  {
    int low = -(calibration - OFFSET_POINT) + offset60DB;

    if (low == 0) return 0;
    return project(value, low, 0, OFFSET_POINT, calibration);
  }
}