Android Open Source - audiopulse-androidclient Plot Spectral View

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License

The source code is released under:
GNU General Public License
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Java Source Code

/* ===========================================================
 * SanaAudioPulse : a free platform for teleaudiology.
 *              //from   www . j  av  a  2 s . c o m
 * ===========================================================
 *
 * (C) Copyright 2012, by Sana AudioPulse
 *
 * Project Info:
 *    SanaAudioPulse: http://code.google.com/p/audiopulse/
 *    Sana: http://sana.mit.edu/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * [Android is a trademark of Google Inc.]
 *
 * -----------------
 * PlotSpectralView.java 
 * based on DeviationRendererDemo02View.java
 * from afreechartdemo
 * -----------------
 * (C) Copyright 2012, by SanaAudioPulse
 *
 * Original Author:  Ikaro Silva
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * Check: http://code.google.com/p/audiopulse/source/list
 */ 
package org.audiopulse.graphics;

import org.afree.chart.AFreeChart;
import org.afree.chart.ChartFactory;
import org.afree.chart.plot.IntervalMarker;
import org.afree.chart.plot.Marker;
import org.afree.chart.plot.PlotOrientation;
import org.afree.chart.plot.ValueMarker;
import org.afree.chart.plot.XYPlot;
import org.afree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.afree.data.xy.XYDataset;
import org.afree.data.xy.XYSeries;
import org.afree.data.xy.XYSeriesCollection;
import org.afree.graphics.SolidColor;
import org.afree.ui.Layer;
import org.afree.ui.LengthAdjustmentType;

import android.content.Context;
import android.graphics.Color;
import android.util.Log;

/**
 * DeviationRendererDemo02View
 */
public class PlotSpectralView extends DemoView {

  /**
   * constructor
   * @param context
   * @param sampleRate 
   * @param audioBuffer 
   * @param N 
   */
  private static final String TAG="PlotSpectralView";
  private static double[] audioBuffer;
  private static float sampleRate;
  //occur (in Hz)
  private static double expectedFrequency;
  static int fftSize;
  
  //Range for highlighting where the expected response 
  //should be and what is the region used for calculation of noise
  static double fRangeStart;
  static double fRangeEnd;
  

  //Assumptions!!
  //If FFT size is zero, the user is passing the already calculated FFT values

  public PlotSpectralView(Context context,double[] aBuffer, float Fs, 
      double eFrequency, int fftN, double[] noiseRangeHz) {
    super(context);
    audioBuffer=aBuffer;
    sampleRate=Fs;  
    fftSize=fftN;
    expectedFrequency=eFrequency;
    fRangeStart=noiseRangeHz[0];
    fRangeEnd=noiseRangeHz[1];
    Log.v(TAG,"Fs=" + sampleRate + " ,N= " + aBuffer.length);
    Log.v(TAG,"fRangeStart=" + fRangeStart + " ,fRangeEnd " + fRangeEnd);
    final AFreeChart chart = createChart2();
    setChart(chart);
  }
  private static XYSeriesCollection createDataset2() {

    XYSeriesCollection result = new XYSeriesCollection();
    XYSeries series = new XYSeries(1);
    Log.v(TAG,"loading spectrum");
    //In this case the spectrum is already calculated
    double step=sampleRate/(2.0*(audioBuffer.length-1));
    for(int k=0;k<(audioBuffer.length);k++){
      series.add(k*step, audioBuffer[k]);
    }
    result.addSeries(series);
    return result;
  }


  private static AFreeChart createChart2() {
    XYDataset dataset = createDataset2();
    // create the chart...
    AFreeChart chart = ChartFactory.createXYLineChart(
        "Spectrum", // chart title
        "Frequency (Hz)", // x axis label
        "Amplitude (dB)", // y axis label
        dataset, // data
        PlotOrientation.VERTICAL,
        false, // include legend
        true, // tooltips
        false // urls
        );
    XYPlot plot = (XYPlot) chart.getPlot();
    plot.setBackgroundPaintType(new SolidColor(Color.rgb(0, 0, 0)));
    plot.getDomainAxis().setLowerMargin(0.0);
    plot.getDomainAxis().setUpperMargin(0.0);
    XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer(true, false);
    renderer.setSeriesPaintType(0, new SolidColor(Color.rgb(0, 255, 0)));

    renderer.setSeriesStroke(0,3.0f);  
    plot.setRenderer(renderer);  
    if(expectedFrequency != 0){
      Marker marker_V = new IntervalMarker(fRangeStart, fRangeEnd);
      marker_V.setLabelOffsetType(LengthAdjustmentType.EXPAND);
      marker_V.setPaintType(new SolidColor(Color.rgb(150, 150, 255)));
      plot.addDomainMarker(marker_V, Layer.BACKGROUND);
      Marker marker_V_Start = new ValueMarker(fRangeStart, Color.BLUE, 2.0f);
      Marker marker_V_End = new ValueMarker(fRangeEnd, Color.BLUE, 2.0f);
      plot.addDomainMarker(marker_V_Start, Layer.BACKGROUND);
      plot.addDomainMarker(marker_V_End, Layer.BACKGROUND);
    }
    return chart;
  }
}
Java Source Code List
