soda_wfall_data.cpp

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/*
Copyright (c) 2017 Matthew H. Reilly (kb1vc)
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
    Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "soda_wfall_data.hpp"
#include <iostream>
#include <boost/format.hpp>

GUISoDa::WFallData::WFallData() {
  clearReady(); 
  num_rows = 300;
  min_time = -1.0 * ((double) num_rows);
  
  setInterval( Qt::XAxis, QwtInterval(0.0, 100e9)); // I don't think we'll see too many 100GHz scans
  setInterval( Qt::YAxis, QwtInterval(-1.0 * ((double) num_rows), 0.0)); // store the last 300 rows

  ref_level = -80.0; 
  dynamic_range = 80.0; 
  setZRange();

  start_freq = new double[num_rows]; 
  cur_freq_idx = 0; 
  cur_row_idx = 0; 
  last_cidx = 0; 

  f_lo_marker = f_hi_marker = 0.0; 

  heatmap = NULL; 
  num_buckets = 0; 

}

GUISoDa::WFallData::~WFallData() {
  delete[] heatmap;
}

void GUISoDa::WFallData::setSpectrumDimensions(double cfreq, double span, long buckets)
{
  (void) cfreq; 
  clearReady();

  if((heatmap != NULL) && (buckets != num_buckets)) {
    delete[] heatmap; 
    heatmap = NULL; 
  }
  if(heatmap == NULL) {
    heatmap_size = buckets * num_rows;     
    heatmap = new double[heatmap_size];
  }
  
  num_buckets = buckets; 

  // these are the dimensions for the input data -- it may 
  span_in_freq = span;

  r_fbucket_size = ((double) num_buckets) / span; 
  setReady();
}

double GUISoDa::WFallData::value(double f, double t) const
{
  // if we don't have the scales setup, then report a very negative number
  if(!is_ready) return -1e6;
  
  // first, see if this is a marker position.
  if(((last_freq < f_lo_marker) && (f >= f_lo_marker)) ||
     ((last_freq < f_hi_marker) && (f >= f_hi_marker))) {
    last_freq = f; 
    return 1e6; // bright line
  }
  last_freq = f; 

  // t goes back in time.  0 is now, min_time is "back there"
  // cur_row_idx in the heatmap is the latest entry.
  //
  long rowidx;       
  long freqidx; 
  if(t == 0.0) {
    rowidx = cur_row_idx; 
    freqidx = cur_freq_idx; 
  }
  else {
    long tidx = ((long) (t - min_time)); 
    rowidx = cur_row_idx - num_buckets * tidx; 
    freqidx = cur_freq_idx - tidx; 
    if(rowidx < 0) {
      rowidx += heatmap_size;
      freqidx += num_rows; 
    }
    if(rowidx > (heatmap_size - num_buckets)) {
      rowidx -= heatmap_size;
      freqidx -= num_rows;       
    }
  }
  // now find the index for the frequency.
  double min_spect_freq = start_freq[freqidx];
  // if the frequency is out of range, return nosignal
  if((f < min_spect_freq) || (f > (min_spect_freq + span_in_freq))) return -1e6; 

  

  long cidx = ((long) ((f - min_spect_freq) * r_fbucket_size)); 
  // since the data points requested are at intervals that don't match
  // our actual bucket size, we sample the range of values from the point
  // of the last sample to this one... (pixels will then show the max value
  // in the region to the pixel's left.)
  double ret;
  if(cidx > last_cidx) {
    // report out the max value;
    ret = heatmap[rowidx + cidx]; 
    for(int i = rowidx + last_cidx + 1; i <= rowidx + cidx; i++) {
      if(ret < heatmap[i]) ret = heatmap[i]; 
    }
  }
  else {
    ret = heatmap[rowidx + cidx];
  }
  last_cidx = cidx; 

  return ret; 
}

void GUISoDa::WFallData::setZRange() {
  setInterval( Qt::ZAxis, QwtInterval(ref_level, ref_level + dynamic_range));
}

void GUISoDa::WFallData::setDynamicRange(double drange) {
  dynamic_range = drange; 
  setZRange(); 
}

void GUISoDa::WFallData::setRefLevel(double reflvl) {
  ref_level = reflvl;
  setZRange();  
}

void GUISoDa::WFallData::updateData(double cfreq, float * spect) {
  if(!is_ready) return; 
  cur_row_idx += num_buckets;
  cur_freq_idx++; 
  if(cur_row_idx > (heatmap_size - num_buckets)) {
    cur_row_idx = 0;
    cur_freq_idx = 0; 
  }
  
  double * vec = heatmap + cur_row_idx; 
  for(int i = 0; i < num_buckets; i++) {
    vec[i] = spect[i]; 
  }
  start_freq[cur_freq_idx] = cfreq - 0.5 * span_in_freq; 
}