soda_spect.cpp

Go to the documentation of this file.

/*
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_spect.hpp"
#include <iostream>
#include <boost/format.hpp>
#include <cmath>

#include <qwt/qwt_plot_grid.h>
#include <qwt/qwt_scale_engine.h>



GUISoDa::Spect::Spect(QWidget *parent) :
    QwtPlot(parent)
{
    initPlot();
}

GUISoDa::Spect::~Spect()
{
  if(freqs != NULL) delete[] freqs; 
  if(vals != NULL) delete[] vals; 
  num_buckets = 0; 
}


void GUISoDa::Spect::initPlot()
{

  freq_span_disp = 10e3;
  val_ref = 10.0;

  num_buckets = 0; 
  freqs = NULL; 
  vals = NULL; 

  setCanvasBackground(Qt::black);
  //QwtLinearScaleEngine se;
  //setAxisScaleDiv(QwtPlot::xBottom, se.divideScale(144.1e6,144.2e6,10,5));
  enableAxis(QwtPlot::xBottom, true);
  enableAxis(QwtPlot::yLeft, true);
  enableAxis(QwtPlot::yRight, true);

  freq_draw_p = new FreqScaleDraw(); 
  setAxisScaleDraw(QwtPlot::xBottom, freq_draw_p);

  setFreqCenter(144.15e6);
  setRefLevel(20);

  curve_p = new QwtPlotCurve();
  curve_p->attach(this);

  grid_p = new QwtPlotGrid();
  grid_p->setPen(Qt::gray);
  grid_p->attach(this);

  curve_p->setPen(Qt::red);
  // curve_p->setSamples(xdat, ydat, 1000);

  // setup the plotpicker -- this creates click events for us.
  picker_p = new GUISoDa::PlotPicker(QwtPlot::xBottom, QwtPlot::yLeft, canvas());

  connect(picker_p, SIGNAL(selected(const QPointF&)), SLOT(pickPoint(const QPointF&)));

  QColor fcol = Qt::green;
  fcol.setAlpha(96);
  freq_marker.setBrush(fcol);
  freq_marker.setPen(fcol);
  // make a dummy marker
  freq_marker.setRect(QRectF(1.0, -100.0, 2.0, 100.0));
  freq_marker.attach(this);
  replot();
  show();
}

void GUISoDa::Spect::updateData(double cfreq, float * y)
{
  if(cfreq != center_freq_in) resetFreqAxis(cfreq); 
  for(int i = 0; i < num_buckets; i++) vals[i] = y[i]; 
  curve_p->setSamples(freqs, vals, num_buckets);
  replot();
}

void GUISoDa::Spect::setRefLevel(int rlvl)
{
  val_ref = ((double) rlvl);
  replotYAxis();
}

void GUISoDa::Spect::setDynamicRange(double drange)
{
  val_range = drange;
  replotYAxis();
}

void GUISoDa::Spect::replotYAxis()
{
  double y_min = val_ref - val_range;
  double y_step = 5.0; 
  if(val_range < 25.1) y_step = 2.5; 
  if(val_range < 10.1) y_step = 1.0;
  setAxisScale(QwtPlot::yLeft, y_min, val_ref, y_step);
  setAxisScale(QwtPlot::yRight, y_min, val_ref, y_step);
  replot();
}


void GUISoDa::Spect::replotXAxis()
{
  double min = center_freq_disp - freq_span_disp * 0.5;
  double max = center_freq_disp + freq_span_disp * 0.5;

  
  setAxisScale(QwtPlot::xBottom, min, max, freq_span_disp / 5.0); // step);

  QwtLinearScaleEngine se;
  setAxisScaleDiv(QwtPlot::xBottom, se.divideScale(min, max, 5, 5));
  freq_draw_p->setFreqStep(center_freq_disp, freq_span_disp / 5.0);
  replot();
}

void GUISoDa::Spect::setFreqCenter(double cf, bool check_boundary) 
{
  (void) check_boundary;
  center_freq_disp = cf; 
  replotXAxis();
}


double GUISoDa::Spect::correctCenterFreq(double cfreq)
{
  if((cfreq + 0.5 * freq_span_disp) > (center_freq_in + 0.5 * freq_span_in)) {
    cfreq = (center_freq_in + 0.5 * (freq_span_in - freq_span_disp));
  }
  if((cfreq - 0.5 * freq_span_disp) < (center_freq_in - 0.5 * freq_span_in)) {
    cfreq = (center_freq_in - 0.5 * (freq_span_in - freq_span_disp));
  }
  return cfreq; 
}

void GUISoDa::Spect::setFreqSpan(double fs, bool check_boundary) {
  freq_span_disp = fs;   
  if(check_boundary) {
    center_freq_disp = correctCenterFreq(center_freq_disp);
    if((marker_freq < (center_freq_disp - 0.5 * freq_span_disp)) ||
       (marker_freq > (center_freq_disp + 0.5 * freq_span_disp))) {
      center_freq_disp = correctCenterFreq(marker_freq);
    }
  }
  replotXAxis();
}


void GUISoDa::Spect::pickPoint(const QPointF & pos)
{
  double freq = pos.x() - marker_lo_offset; 
  setFreqMarker(freq);
  emit xClick(freq);
}

void GUISoDa::Spect::setMarkerOffset(double lo, double hi) { 
  marker_lo_offset = lo;
  marker_hi_offset = hi;       
  setFreqMarker(marker_freq); 
}


void GUISoDa::Spect::setFreqMarker(double freq)
{
  double f = freq + marker_lo_offset; 
  double width = marker_hi_offset - marker_lo_offset;
  freq_marker.setRect(QRectF(f, -200.0, width, 300.0));

  marker_freq = freq;   
  replot();
}

void GUISoDa::Spect::resetFreqAxis(double cfreq) {
  // load up the X axis values. (frequency)
  double fincr = freq_span_in / ((double) (num_buckets-1));
  double fr = cfreq - 0.5 * freq_span_in; 
  for(int i = 0; i < num_buckets; i++) {
    freqs[i] = fr; 
    fr += fincr; 
  }
}

void GUISoDa::Spect::configureSpectrum(double cfreq, double span, long buckets) {
  marker_freq = cfreq; 
  center_freq_in = cfreq; 
  freq_span_in = span; 
  if(num_buckets < buckets) {
    if(freqs != NULL) delete[] freqs; 
    if(vals != NULL) delete[] vals; 
    freqs = new double[buckets];
    vals = new double[buckets];
    num_buckets = buckets; 
  }

  resetFreqAxis(cfreq);  
  // load up the Y axis values. 
  for(int i = 0; i < num_buckets; i++) {
    vals[i] = -200.0; 
  }
    
  // set the center display frequency and span. 
  setFreqCenter(cfreq); 
  //   setFreqSpan(200.0e3); // default span. 
}