soda_freq_scale_draw.hpp

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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
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    Redistributions in binary form must reproduce the above copyright
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    the documentation and/or other materials provided with the
    distribution.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/

#ifndef SODA_FREQ_SCALE_DRAW_HDR
#define SODA_FREQ_SCALE_DRAW_HDR
#include <qwt/qwt_scale_draw.h>
#include <boost/format.hpp>
#include <cmath>

namespace GUISoDa {

  class FreqScaleDraw : public QwtScaleDraw
  {
  public:
    explicit FreqScaleDraw() {
      center_freq = 0.0;
    }

    void setFreqStep(double cf, double st) { center_freq = cf; freq_step = st; }

    virtual QwtText label(double f) const override {
      if(1 || (fabs(f - center_freq) < 0.5 * freq_step)) {
    return QwtText(QString::number(f * 1e-6, 'f', 3));
      }
      else {
    double df = f * 1e-6;
    df = df - floor(df);

    return QwtText(QString::number(df * 1000.0, 'f', 0));
      }
    }
  protected:
    double center_freq;
    double freq_step;
  };
}

#endif