PlotFragment.java 文件源码

/**
 *  Updates the CN0 versus Time plot data from a {@link GnssMeasurement}
 */
protected void updateCnoTab(GnssMeasurementsEvent event) {
  long timeInSeconds =
      TimeUnit.NANOSECONDS.toSeconds(event.getClock().getTimeNanos());
  if (mInitialTimeSeconds < 0) {
    mInitialTimeSeconds = timeInSeconds;
  }

  // Building the texts message in analysis text view
  List<GnssMeasurement> measurements =
      sortByCarrierToNoiseRatio(new ArrayList<>(event.getMeasurements()));
  SpannableStringBuilder builder = new SpannableStringBuilder();
  double currentAverage = 0;
  if (measurements.size() >= NUMBER_OF_STRONGEST_SATELLITES) {
    mAverageCn0 =
        (mAverageCn0 * mMeasurementCount
                + (measurements.get(0).getCn0DbHz()
                        + measurements.get(1).getCn0DbHz()
                        + measurements.get(2).getCn0DbHz()
                        + measurements.get(3).getCn0DbHz())
                    / NUMBER_OF_STRONGEST_SATELLITES)
            / (++mMeasurementCount);
    currentAverage =
        (measurements.get(0).getCn0DbHz()
                + measurements.get(1).getCn0DbHz()
                + measurements.get(2).getCn0DbHz()
                + measurements.get(3).getCn0DbHz())
            / NUMBER_OF_STRONGEST_SATELLITES;
  }
  builder.append(getString(R.string.history_average_hint,
      sDataFormat.format(mAverageCn0) + "\n"));
  builder.append(getString(R.string.current_average_hint,
      sDataFormat.format(currentAverage) + "\n"));
  for (int i = 0; i < NUMBER_OF_STRONGEST_SATELLITES && i < measurements.size(); i++) {
    int start = builder.length();
    builder.append(
        mDataSetManager.getConstellationPrefix(measurements.get(i).getConstellationType())
            + measurements.get(i).getSvid()
            + ": "
            + sDataFormat.format(measurements.get(i).getCn0DbHz())
            + "\n");
    int end = builder.length();
    builder.setSpan(
        new ForegroundColorSpan(
            mColorMap.getColor(
                measurements.get(i).getSvid(), measurements.get(i).getConstellationType())),
        start,
        end,
        Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
  }
  builder.append(getString(R.string.satellite_number_sum_hint, measurements.size()));
  mAnalysisView.setText(builder);

  // Adding incoming data into Dataset
  mLastTimeReceivedSeconds = timeInSeconds - mInitialTimeSeconds;
  for (GnssMeasurement measurement : measurements) {
    int constellationType = measurement.getConstellationType();
    int svID = measurement.getSvid();
    if (constellationType != GnssStatus.CONSTELLATION_UNKNOWN) {
      mDataSetManager.addValue(
          CN0_TAB,
          constellationType,
          svID,
          mLastTimeReceivedSeconds,
          measurement.getCn0DbHz());
    }
  }

  mDataSetManager.fillInDiscontinuity(CN0_TAB, mLastTimeReceivedSeconds);

  // Checks if the plot has reached the end of frame and resize
  if (mLastTimeReceivedSeconds > mCurrentRenderer.getXAxisMax()) {
    mCurrentRenderer.setXAxisMax(mLastTimeReceivedSeconds);
    mCurrentRenderer.setXAxisMin(mLastTimeReceivedSeconds - TIME_INTERVAL_SECONDS);
  }

  mChartView.invalidate();
}