path: root/src/gui.cxx

#include <iostream>
#include <iomanip>
#include "gui_class.h"
#include <gsl/gsl_fit.h>
#include <iostream>
using namespace std;

#define STRETCH /* nothing */

extern int verbosity;           // should be in a .h file somewhere

/////////////////
// some kludgey global variables,
// mostly for inter-thread communication
int pcmRate(0);
double cpkp(0);                // cycles per krunch period
double fpkp(0);                // frames per krunch period:
double actOutFreq(0);          // actual refout frequency
double refOutAmp_dB(-15.);         // default should not be not too loud
double VoCal_dB(0.);
double ViCal_dB(0.);
double timeShift(0.);           // in seconds
double phaseShift(0.);          // in degrees
double lockerPhase(0.);         // in degrees
int repaintFrame(0);
//
// Note: more globals can be found in lockin.cxx

class colorer {
public:
  Qt::GlobalColor code;
  const char* name;

  colorer(const Qt::GlobalColor _code, const char* const _name)
  : code(_code), name(_name)
  {}
};

#define X(foo) colorer(Qt::foo, #foo)

static colorer color_list[] = {X(red), X(blue), X(black)};

#undef X

static int color_list_size = sizeof(color_list) / sizeof(color_list[0]);

#if 0           /* code not needed at present */
double now(){
  timespec xx;

#ifdef _POSIX_MONOTONIC_CLOCK
  clock_gettime(CLOCK_MONOTONIC, &xx);
#else
  clock_gettime(CLOCK_MONOTONIC, &xx);
#endif

  return xx.tv_sec + xx.tv_nsec*1e-9;
}
#endif

myWindow::myWindow() {
// The top myWindow and its layout : horizontal:
  // topWindow == this
  topLayout = new QHBoxLayout;
  setLayout(topLayout);

  ctrlCol = new ctrl_column(this);
  topLayout->addWidget(ctrlCol->group);

  for (int ii = 0; ii < myWindow::numRsltPanels; ii++){
    rsltPanel[ii] = new rslt_panel(this);
    topLayout->addWidget(rsltPanel[ii]->group);
  }

// setting the indication to its current value won't
// change the indicator, but will cause it to update
// the associated plot
  for (unsigned int ii = 0; ii < ndc8r.size(); ii++){
    indicator* foo = ndc8r[ii];
    foo->setIndication(0,0, foo->rpBox->value(), foo->ipBox->value());
  }

  frameTimer = new timer;
}

void myWindow::flush() {
  if (!repaintFrame) return;
  repaintFrame = 0;
  for (int ii = 0; ii < numRsltPanels; ii++){
    rsltPanel[ii]->plot->flush();
  }
}

ctrl_column::ctrl_column(myWindow* topwin){
  group = new QGroupBox;
  group->setFlat(0);
  layout = new QVBoxLayout;
  group->setLayout(layout);

  refOutGroup = new refOut_grouper(topwin);
  layout->addWidget(refOutGroup->group);

  layout->insertStretch(-1);

  entrailsGroup = new entrails_grouper(topwin);
  layout->addWidget(entrailsGroup->group);
}


// the refOut group and its layout: vertical:
refOut_grouper::refOut_grouper(myWindow* _topwin)
: topwin(_topwin),
  VLabel(0)
{
// the freq box
  group = new QGroupBox("Ref Out");
  layout = new QVBoxLayout;
  group->setLayout(layout);
//group->setStyleSheet("background-color: lavenderblush;");
//group->setStyleSheet("background-color: rgba(100, 0, 0, 150);");
//group->setStyleSheet("background-color: lightcyan;");
  group->setStyleSheet(".QGroupBox{background-color: #E8ffFF}");
    freqLabel = new QLabel;
    freqLabel->setText("Frequency");

    freqBox = new QDoubleSpinBox;
    freqBox->setRange(0.0, 10000.0);
    freqBox->setSingleStep(1);
    freqBox->setValue(440);
    freqBox->setKeyboardTracking(0);
    freqBox->setSuffix(" Hz");
    connect(freqBox, SIGNAL(valueChanged(double)),
       this, SLOT(freqChanged(double)));

    actFreqLabel = new QLabel;
    actFreqLabel->setText("Actual");

    actFreqBox = new QDoubleSpinBox;
    actFreqBox->setRange(0.0, 10000.0);
    actFreqBox->setValue(440);
    actFreqBox->setReadOnly(1);
    actFreqBox->setButtonSymbols(QAbstractSpinBox::NoButtons);
    actFreqBox->setSuffix(" Hz");

    dBLabel = new QLabel;
    dBLabel->setText("Amplitude");

    dBBox = new QDoubleSpinBox;
    dBBox->setRange(-1000.0, 1000.0);
    dBBox->setDecimals(3);
    dBBox->setSingleStep(1);
//later:    dBBox->setValue(refOutAmp_dB);
    dBBox->setKeyboardTracking(0);
    dBBox->setSuffix(" dBV");
    connect(dBBox, SIGNAL(valueChanged(double)),
       this, SLOT(ampChanged(double)));

// express amplitude in V, not just in dB:
//??    VLabel = new QLabel;
//??    VLabel->setText("???");

    VBox = new QDoubleSpinBox;
    VBox->setRange(-1e300, +1e300);
    VBox->setReadOnly(1);
    VBox->setDecimals(6);
    VBox->setButtonSymbols(QAbstractSpinBox::NoButtons);
    VBox->setSuffix(" V");

    dBBox->setValue(refOutAmp_dB);         // will throw ampChanged signal

  layout->addWidget(freqLabel STRETCH);
  layout->addWidget(freqBox STRETCH);
  layout->addWidget(actFreqLabel STRETCH);
  layout->addWidget(actFreqBox STRETCH);
  layout->addWidget(dBLabel STRETCH);
  layout->addWidget(dBBox STRETCH);
  if (VLabel) layout->addWidget(VLabel STRETCH);
  layout->addWidget(VBox STRETCH);
}

// the entrails group and its layout: vertical:
entrails_grouper::entrails_grouper(myWindow* _topwin)
: topwin(_topwin),
  tweakFreq(tweakSize),
  tweakPhase(tweakSize),
  tweakPtr(0),
  howmany(0)
{
  group = new QGroupBox("Entrails");
  layout = new QVBoxLayout;
  group->setLayout(layout);
  group->setStyleSheet("QGroupBox{background-color: #ffffe0}");

    VoCalLabel = new QLabel;
    VoCalLabel->setText("Vo Calibration");

    VoCalBox = new QDoubleSpinBox;
    VoCalBox->setRange(-1e300, +1e300);
    VoCalBox->setSingleStep(1);
    VoCalBox->setKeyboardTracking(0);
    VoCalBox->setSuffix(" dBV FS");
    connect(VoCalBox, SIGNAL(valueChanged(double)),
       this, SLOT(VoChanged(double)));
    VoCalBox->setValue(VoCal_dB);

    ViCalLabel = new QLabel;
    ViCalLabel->setText("Vi Calibration");

    ViCalBox = new QDoubleSpinBox;
    ViCalBox->setRange(-1e300, +1e300);
    ViCalBox->setSingleStep(1);
    ViCalBox->setKeyboardTracking(0);
    ViCalBox->setSuffix(" dBV FS");
    connect(ViCalBox, SIGNAL(valueChanged(double)),
       this, SLOT(ViChanged(double)));
    ViCalBox->setValue(ViCal_dB);

    rateLabel = new QLabel;
    rateLabel->setText("Krunch Rate");

    rateBox = new QDoubleSpinBox;
    rateBox->setRange(0.0, 1e300);
    rateBox->setSingleStep(1);
    rateBox->setValue(6.);
    rateBox->setKeyboardTracking(0);
    rateBox->setSuffix(" Hz");
    connect(rateBox, SIGNAL(valueChanged(double)),
       this, SLOT(rateChanged(double)));

    actRateLabel = new QLabel;
    actRateLabel->setText("Actual");

    actRateBox = new QDoubleSpinBox;
    actRateBox->setRange(0.0, 1e300);
    actRateBox->setValue(6.);
    actRateBox->setReadOnly(1);
    actRateBox->setSuffix(" Hz");
    actRateBox->setButtonSymbols(QAbstractSpinBox::NoButtons);

    pcmLabel = new QLabel;
    pcmLabel->setText("PCM Rate");

    pcmBox = new QDoubleSpinBox;
    pcmBox->setRange(-1e300, +1e300);
    pcmBox->setValue(440);
    pcmBox->setReadOnly(1);
    pcmBox->setSuffix(" Hz");
    pcmBox->setButtonSymbols(QAbstractSpinBox::NoButtons);

    timeShiftLabel = new QLabel;
    timeShiftLabel->setText("Time Shift");

    timeShiftBox = new QDoubleSpinBox;
    timeShiftBox->setRange(-1000.0, 1000.0);
    timeShiftBox->setDecimals(6);
    timeShiftBox->setSingleStep(1e-6);
    timeShiftBox->setValue(timeShift);
    timeShiftBox->setKeyboardTracking(0);
    timeShiftBox->setSuffix(" s");
    connect(timeShiftBox, SIGNAL(valueChanged(double)),
       this, SLOT(timeShiftChanged(double)));

    phaseShiftLabel = new QLabel;
    phaseShiftLabel->setText("Phase Shift");

    phaseShiftBox = new QDoubleSpinBox;
    phaseShiftBox->setRange(-1e300, +1e300);
    phaseShiftBox->setDecimals(2);
    phaseShiftBox->setSingleStep(1);
    phaseShiftBox->setValue(phaseShift);
    phaseShiftBox->setKeyboardTracking(0);
    phaseShiftBox->setSuffix(QString::fromUtf8(" °"));
    connect(phaseShiftBox, SIGNAL(valueChanged(double)),
       this, SLOT(phaseShiftChanged(double)));

    tweakButton = new QPushButton("&Tweak");
    connect(tweakButton, SIGNAL(clicked()),
       this, SLOT(tweakButtonClicked()));

  layout->addWidget(VoCalLabel STRETCH);
  layout->addWidget(VoCalBox STRETCH);

  layout->addWidget(ViCalLabel STRETCH);
  layout->addWidget(ViCalBox STRETCH);

  layout->addWidget(rateLabel STRETCH);
  layout->addWidget(rateBox STRETCH);
  layout->addWidget(actRateLabel STRETCH);
  layout->addWidget(actRateBox STRETCH);
  layout->addWidget(pcmLabel STRETCH);
  layout->addWidget(pcmBox STRETCH);
  layout->addWidget(timeShiftLabel STRETCH);
  layout->addWidget(timeShiftBox STRETCH);
  layout->addWidget(phaseShiftLabel STRETCH);
  layout->addWidget(phaseShiftBox STRETCH);
  layout->addWidget(tweakButton STRETCH);
}

rslt_panel::rslt_panel(myWindow* _topWin)
: topWin(_topWin)
{
  group = new QGroupBox;
  group->setFlat(0);
  layout = new QHBoxLayout;
  group->setLayout(layout);
  plot = new myPlot("plotname");
  block = new blockOfIndicators(topWin, plot);
//  layout->addWidget(plot, 0, Qt::AlignHCenter);
  layout->addWidget(plot);
  layout->addWidget(block->group);
  layout->insertStretch(-1);
}

double quantize125(double arg){
  if (arg < sqrt(2.)) return 1.;
  if (arg < sqrt(10.)) return 2.;
  if (arg < sqrt(50.)) return 5.;
  return 10.;
}

double logstep(double arg){
  double ctc = pow(10., floor(log10(arg)));
  double mant = arg / ctc;
  return quantize125(mant) * ctc;
}

scaleBoxer::scaleBoxer(indicator* _parent)
: parent(_parent)
{}

void scaleBoxer::stepBy(int steps){
  double newval(1);
  if (steps ==  1) newval = logstep(2.0 * logstep(value()));
  if (steps == -1) newval = logstep(0.5 * logstep(value()));

  if (steps ==  10) newval = logstep(10.0 * value());
  if (steps == -10) newval = logstep( 0.1 * value());
  parent->setDecim(newval);
  setValue(newval);
}

void indicator::setDecim(const double newval){
  int decim = -int(floor(log10(newval)));
  scaleBox->setDecimals(std::max(0, decim));
  rpBox->setDecimals(std::max(0, 2+decim));
  ipBox->setDecimals(std::max(0, 2+decim));
  magBox->setDecimals(std::max(0, 2+decim));
}


// An indicator and its internal layout: grid:
indicator::indicator(myPlot* _plot, int _locker)
: plot(_plot),
  plotcur(0),
  locker(_locker)
{
  if (plot) {
    plotcur = plot->assign_curve();
  }

  group = new QGroupBox;
  group->setFlat(0);
  QString style = ".QGroupBox{";
  if (plot) {
    style += "border-top: 4px solid ";
    style += color_list[plotcur % color_list_size].name;
    style += ";";
  }
  style += "background-color: #D0ffD0;";
  style += "}";
  group->setStyleSheet(style);

  layout = new QGridLayout;
  group->setLayout(layout);

    scaleLabel = new QLabel;
    scaleLabel->setText("Scale");

    scaleBox = new scaleBoxer(this);
    scaleBox->setKeyboardTracking(0);
    scaleBox->setRange(-1e300, +1e300);
    double sc(pow(10., ViCal_dB/20.));
    sc /= 2.5;       // half scale, where full scale is 5 divisions
    sc = logstep(sc);
    scaleBox->setDecimals(10);
    scaleBox->setValue(sc);
    scaleBox->setSuffix(" V/div");

    rpLabel = new QLabel;
    rpLabel->setText("Rp");

    rpBox = new QDoubleSpinBox;
    rpBox->setReadOnly(1);
    rpBox->setButtonSymbols(QAbstractSpinBox::NoButtons);
    rpBox->setRange(-1e300, +1e300);
    rpBox->setValue(0);
    rpBox->setSuffix(" V");

    ipLabel = new QLabel;
    ipLabel->setText("Ip");

    ipBox = new QDoubleSpinBox;
    ipBox->setReadOnly(1);
    ipBox->setButtonSymbols(QAbstractSpinBox::NoButtons);
    ipBox->setRange(-1e300, +1e300);
    ipBox->setValue(0);
    ipBox->setSuffix(" V");

    magLabel = new QLabel;
    magLabel->setText("Mag");

    magBox = new QDoubleSpinBox;
    magBox->setReadOnly(1);
    magBox->setButtonSymbols(QAbstractSpinBox::NoButtons);
    magBox->setRange(-1e300, +1e300);
    magBox->setValue(0.1234);
    magBox->setSuffix(" V");

    phaseLabel = new QLabel;
    phaseLabel->setText("Phase");

    phaseBox = new QDoubleSpinBox;
    phaseBox->setReadOnly(1);
    phaseBox->setButtonSymbols(QAbstractSpinBox::NoButtons);
    phaseBox->setRange(-1e300, +1e300);
    phaseBox->setSuffix(QString::fromUtf8(" °"));

  setDecim(sc);

  int row(0);
  layout->addWidget(scaleLabel, row, 0);
  row++;
  layout->addWidget(scaleBox, row, 0);
  row++;
  layout->addWidget(rpLabel, row, 0);
  layout->addWidget(ipLabel, row, 1);
  row++;
  layout->addWidget(rpLabel, row, 0);
  layout->addWidget(ipLabel, row, 1);
  row++;
  layout->addWidget(rpBox, row, 0);
  layout->addWidget(ipBox, row, 1);
  row++;
  layout->addWidget(magLabel, row, 0);
  layout->addWidget(phaseLabel, row, 1);
  row++;
  layout->addWidget(magBox, row, 0);
  layout->addWidget(phaseBox, row, 1);
}

blockOfIndicators::blockOfIndicators(myWindow* topwin, myPlot* plot)
{
  group = new QGroupBox;
  group->setFlat(0);
  group->setStyleSheet("border:0;");
  layout = new QVBoxLayout;
  indicator* temp;
  group->setLayout(layout);

    temp = new indicator(plot, 1/* phaselock */);
    topwin->ndc8r.push_back(temp);
  layout->addWidget(temp->group);

    temp = new indicator(plot);
    topwin->ndc8r.push_back(temp);
  layout->addWidget(temp->group);

    temp = new indicator(plot);
    topwin->ndc8r.push_back(temp);
  layout->addWidget(temp->group);

  layout->insertStretch(-1);
}

void indicator::setIndication(const double rp0, const double ip0,
                        const double rp1, const double ip1){
  double rp(rp1-rp0);
  double ip(ip1-ip0);
  double mag(sqrt(rp*rp + ip*ip));
  double phase(0);
  if (mag) phase = atan2(ip, rp);
  rpBox->setValue(rp);
  ipBox->setValue(ip);
  magBox->setValue(mag);
  double phDeg = phase * 180 / M_PI;
  phaseBox->setValue(phDeg);
  if (locker) lockerPhase = phDeg;
  if (plot) {
    double denom = scaleBox->value();   // volts per division
    denom *= plot->divsPerUnit;         // volts full scale
    plot->setReading(plotcur, rp0/denom, ip0/denom, rp1/denom, ip1/denom);
  }
}

void myPlot::flush() {
  if (need_replot) replot();
}

void myPlot::setReading(const int ndx,
        const double rp0, const double ip0,
        const double rp1, const double ip1){
  int npts(2);
  double xxx[npts];
  double yyy[npts];
  xxx[0] = rp0;
  yyy[0] = ip0;
  xxx[1] = rp1;
  yyy[1] = ip1;
//////////////////  curve[ndx]->setData(xxx, yyy, npts);
  curve[ndx]->setSamples(xxx, yyy, npts);
  need_replot = 1;
}

// There is no such thing as a scale change on the plot.
// Rescale the data instead.
#ifdef OLD_SCALE_IDEA
void myPlot::scaleChange(double newScale){
  setAxisScale(QwtPlot::xBottom, -newScale, newScale);
  setAxisScale(QwtPlot::yLeft, -newScale, newScale);
  replot();
}
#endif

// Unless you set keyboardTracking to false,
// this is useless when typing in digits :
// signals too early and too often.
void refOut_grouper::freqChanged(double /* newfreq not used */)
{
  topwin->actualFreqs();
}

void entrails_grouper::VoChanged(double newVo)
{
  VoCal_dB = newVo;
//wrong  topwin->ctrlCol->refOutGroup->VBox->
//wrong     setValue(pow(10., (refOutAmp_dB + VoCal_dB)/20.));
}

void entrails_grouper::ViChanged(double newVi)
{
  ViCal_dB = newVi;
}

void refOut_grouper::ampChanged(double newAmp)
{
  refOutAmp_dB = newAmp;
//wrong:  VBox->setValue(pow(10., (refOutAmp_dB + VoCal_dB)/20.));
  VBox->setValue(pow(10., (refOutAmp_dB)/20.));
}

void entrails_grouper::rateChanged(double /* newRate not used */)
{
  topwin->actualFreqs();
}

// beware the fmod of a negative number is negative
double pval(const double angle){
  double rslt = fmod(angle, 360.);
  if (rslt >  180.) rslt -= 360.;
  if (rslt < -180.) rslt += 360.;
  return rslt;
}

void entrails_grouper::timeShiftChanged(double newTimeShift)
{
//--  std::cout << "timeShiftChange: " << newTimeShift << std::endl;

// Calculate new phase such that changing the timeShift
// doesn't change the phase;  it is only supposed to
// change d(phase)/d(frequency).
  double newPhase = phaseShift - (newTimeShift - timeShift) * actOutFreq * 360.;
  newPhase = pval(newPhase);
  timeShift = newTimeShift;
  phaseShiftBox->setValue(newPhase);
}

void entrails_grouper::phaseShiftChanged(double newPhaseShift)
{
//--  std::cout << "phaseShiftChange: " << newPhaseShift << std::endl;

  while (newPhaseShift > 360.)  newPhaseShift -= 360.;
  while (newPhaseShift < -360.) newPhaseShift += 360.;

  phaseShift = newPhaseShift;
}

class bad_thing: public std::exception{
  const char* msg;
  virtual const char* what() const throw() {
    return msg;
  }
public:
  bad_thing(const char* _msg)
  : msg(_msg) {}
};

double max(const std::valarray<double>& foo){
  unsigned int howmany(foo.size());
  if (howmany == 0) throw bad_thing("max of empty list");
  double rslt = foo[0];
  for (unsigned int ii = 1; ii < howmany; ii++) {
    rslt = std::max(rslt, foo[ii]);
  }
  return rslt;
}

double min(const std::valarray<double>& foo){
  unsigned int howmany(foo.size());
  if (howmany == 0) throw bad_thing("min of empty list");
  double rslt = foo[0];
  for (unsigned int ii = 1; ii < howmany; ii++) {
    rslt = std::min(rslt, foo[ii]);
  }
  return rslt;
}

void entrails_grouper::tweakButtonClicked(){
  using namespace std;
  double rawPhase = (lockerPhase + phaseShift)
                + actOutFreq*timeShift * 360.;

  if (tweakPtr >= 10) tweakPtr = 0;
  tweakFreq[tweakPtr] = actOutFreq;
  tweakPhase[tweakPtr] = rawPhase;
  tweakPtr++;
  if (howmany < tweakPtr) howmany = tweakPtr;
  // otherwise howmany stays at its maximum, i.e. tweakSize.

  valarray<double> myFreq(&tweakFreq[0], howmany);
  valarray<double> myPhase(&tweakPhase[0], howmany);

  double big =    max(myFreq);
  double little = min(myFreq);
  if (big == little) {
    double newPhase = myPhase.sum() / howmany - timeShift*myFreq[0]*360.;
// This will change the value in the box, and raise
// the valueChanged signal:
    phaseShiftBox->setValue(pval(newPhase));
  } else do {
    valarray<double> cookedPhase(myPhase);
    valarray<double> cookedFreq(myFreq);
    for (unsigned int ii = 0; ii < howmany; ii++) {
      cookedFreq[ii] -= actOutFreq;
      cookedPhase[ii] -= phaseShift + timeShift*myFreq[ii]*360.;
      cookedPhase[ii] = pval(cookedPhase[ii]);
    }
     if (max(cookedPhase) > 90. || min(cookedPhase) < -90.) {
      cout << "Phase range too big; can't tweak." << endl;
      break;
    }
    double intercept, slope;
    double cv00, cv01, cv11;
    double sumsq;
    gsl_fit_linear(&cookedFreq[0], 1,
                   &cookedPhase[0], 1, howmany,
                   &intercept, &slope,
                   &cv00, &cv01, &cv11,
                   &sumsq);

    double newTime = timeShift + slope / 360.;
    double newPhase = phaseShift + intercept
                - (newTime - timeShift) * actOutFreq * 360.;
// must do time shift first:
    timeShiftBox->setValue(newTime);
    phaseShiftBox->setValue(pval(newPhase));

  } while (0);
}

void myWindow::actualFreqs() {
  using namespace std;
  double d_out_freq    = ctrlCol->refOutGroup->freqBox->value();
  { // calculatte cycles per krunch period
    double d_krunch_rate = ctrlCol->entrailsGroup->rateBox->value();
    if (d_krunch_rate == 0.) cpkp = 1;
    else cpkp = round(d_out_freq/d_krunch_rate);
    if (cpkp < 1.) cpkp = 1.;
  }
// frames per krunch period:
  fpkp =  round(cpkp * pcmRate / d_out_freq);
  double actUp = pcmRate / fpkp;
  ctrlCol->entrailsGroup->actRateBox->setValue(actUp);
  ctrlCol->entrailsGroup->pcmBox->setValue(pcmRate);

  actOutFreq = cpkp * actUp;
  ctrlCol->refOutGroup->actFreqBox->setValue(actOutFreq);
  if (verbosity > 0) {
    cout.precision(4);
    cout << fixed;
    cout  << "  d_out_freq: " << d_out_freq
          << "  cpkp: " << cpkp
          << "  fpkp: " << fpkp
          << "  actUp: " << setw(10) << actUp
          << "  actOutFreq: " << actOutFreq
          << endl;
  }
}

myPlot::myPlot(const QString name) : QwtPlot(QwtText(name)),
                    grid(),    divsPerUnit(5),    need_replot(0)
 {
// FIXME : should calculate these sizes:
  setMinimumWidth(500);  setMaximumWidth(500);
  setMinimumHeight(500); setMaximumHeight(500);

// Set up axis, permanently -1 to 1 in both directions.
// We are ASSUMING the library function will give us
// five minor divisions per unit (ten total).
  setAxisScale(QwtPlot::xBottom,-1.0, 1.0, 1.);
  setAxisScale(QwtPlot::yLeft,  -1.0, 1.0, 1.);
  enableAxis(QwtPlot::xBottom, 0);
  enableAxis(QwtPlot::yLeft, 0);
  setStyleSheet("border:0;");

  grid.enableXMin(true);
  grid.enableYMin(true);
  grid.setMajorPen(QPen(Qt::white, 2));
  grid.setMinorPen(QPen(Qt::white, 1));
// was:         (QPen(Qt::white, 1, Qt::DotLine));
  grid.attach(this);
}

int myPlot::assign_curve(){
  int ndx = curve.size();

  curve.push_back(new QwtPlotCurve);

  int npts(2);
  double xxx[npts];
  double yyy[npts];
  xxx[0] = 0;
  yyy[0] = 0;
  xxx[1] = sin(.1 * ndx);
  yyy[1] = cos(.2 * ndx);

/////////////  curve[ndx]->setData(xxx, yyy, npts);
  curve[ndx]->setSamples(xxx, yyy, npts);
  curve[ndx]->setPen(QPen(color_list[ndx % color_list_size].code, 4));
  curve[ndx]->attach(this);

  return ndx;
}

////////////////////////////////////

timer::timer(QWidget *parent)
: QWidget(parent)
{
  startTimer(33);               // 30.303 repaints per second
}

void timer::timerEvent(QTimerEvent* /* event not used */){
  using namespace std;
  repaintFrame = 1;
}