freq_sink_c.h

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/* -*- c++ -*- */
/*
 * Copyright 2012,2014-2015 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 */
 
#ifndef INCLUDED_QTGUI_FREQ_SINK_C_H
#define INCLUDED_QTGUI_FREQ_SINK_C_H
 
#include <gnuradio/fft/window.h>
#include <gnuradio/qtgui/api.h>
#include <gnuradio/qtgui/trigger_mode.h>
#include <gnuradio/sync_block.h>
#include <qapplication.h>
 
namespace gr {
namespace qtgui {
 
/*!
 * \brief A graphical sink to display multiple signals in frequency.
 * \ingroup instrumentation_blk
 * \ingroup qtgui_blk
 *
 * \details
 * This is a QT-based graphical sink the takes set of a complex
 * streams and plots the PSD. Each signal is plotted with a
 * different color, and the \a set_title and \a set_color
 * functions can be used to change the label and color for a given
 * input number.
 *
 * The sink supports plotting streaming complex data or
 * messages. The message port is named "in". The two modes cannot
 * be used simultaneously, and \p nconnections should be set to 0
 * when using the message mode. GRC handles this issue by
 * providing the "Complex Message" type that removes the streaming
 * port(s).
 *
 * This sink can plot messages that contain either uniform vectors
 * of complex 32 values (pmt::is_c32vector) or PDUs where the data
 * is a uniform vector of complex 32 values.
 *
 * Message Ports:
 *
 * - freq (input):
 *        Receives a PMT pair: (intern("freq"), double(frequency)).
 *        This is used to retune the center frequency of the
 *        display's x-axis.
 *
 * - bw (input):
 *        Receives a PMT pair: (intern("bw"), double(bandwidth)).
 *        This is used to programmatically change the bandwidth of
 *        of the display's x-axis.
 *
 * - freq (output):
 *        Produces a PMT pair with (intern("freq"), double(frequency)).
 *        When a user double-clicks on the display, the block
 *        produces and emits a message containing the frequency of
 *        where on the x-axis the user clicked. This value can be
 *        used by other blocks to update their frequency setting.
 *
 *        To perform click-to-tune behavior, this output 'freq'
 *        port can be redirected to this block's input 'freq' port
 *        to catch the message and update the center frequency of
 *        the display.
 */
class QTGUI_API freq_sink_c : virtual public sync_block
{
public:
    // gr::qtgui::freq_sink_c::sptr
    typedef std::shared_ptr<freq_sink_c> sptr;
 
    /*!
     * \brief Build a complex PSD sink.
     *
     * \param fftsize size of the FFT to compute and display. If using
     *        the PDU message port to plot samples, the length of
     *        each PDU must be a multiple of the FFT size.
     * \param wintype type of window to apply (see gr::fft::window::win_type).
     *        By setting bit 16 to one, this block will normalize the window
     *        before applying it. This allows switching between windows without
     *        sacrificing signal power due to tapering, but it will also
     *        amplify some samples. See also set_fft_window_normalized().
     * \param fc center frequency of signal (use for x-axis labels)
     * \param bw bandwidth of signal (used to set x-axis labels)
     * \param name title for the plot
     * \param nconnections number of signals to be connected to the
     *        sink. The PDU message port is always available for a
     *        connection, and this value must be set to 0 if only
     *        the PDU message port is being used.
     * \param parent a QWidget parent object, if any
     */
    static sptr make(int fftsize,
                     int wintype,
                     double fc,
                     double bw,
                     const std::string& name,
                     int nconnections = 1,
                     QWidget* parent = NULL);
 
    virtual void exec_() = 0;
    virtual QWidget* qwidget() = 0;
 
    virtual void set_fft_size(const int fftsize) = 0;
    virtual int fft_size() const = 0;
    virtual void set_fft_average(const float fftavg) = 0;
    virtual float fft_average() const = 0;
    virtual void set_fft_window(const gr::fft::window::win_type win) = 0;
    virtual gr::fft::window::win_type fft_window() = 0;
    //! If true, normalize window to unit power
    virtual void set_fft_window_normalized(const bool enable) = 0;
 
    virtual void set_frequency_range(const double centerfreq, const double bandwidth) = 0;
    virtual void set_y_axis(double min, double max) = 0;
 
    virtual void set_update_time(double t) = 0;
 
    virtual void set_title(const std::string& title) = 0;
    virtual void set_y_label(const std::string& label, const std::string& unit) = 0;
    virtual void set_line_label(unsigned int which, const std::string& label) = 0;
    virtual void set_line_color(unsigned int which, const std::string& color) = 0;
    virtual void set_line_width(unsigned int which, int width) = 0;
    virtual void set_line_style(unsigned int which, int style) = 0;
    virtual void set_line_marker(unsigned int which, int marker) = 0;
    virtual void set_line_alpha(unsigned int which, double alpha) = 0;
 
    /*!
     * Set up a trigger for the sink to know when to start
     * plotting. Useful to isolate events and avoid noise.
     *
     * The trigger modes are Free, Auto, Normal, and Tag (see
     * gr::qtgui::trigger_mode). The first three are like a normal
     * trigger function. Free means free running with no trigger,
     * auto will trigger if the trigger event is seen, but will
     * still plot otherwise, and normal will hold until the trigger
     * event is observed. The Tag trigger mode allows us to trigger
     * off a specific stream tag. The tag trigger is based only on
     * the name of the tag, so when a tag of the given name is seen,
     * the trigger is activated.
     *
     * In auto and normal mode, we look to see if the magnitude of
     * the any FFT point is over the set level.
     *
     * \param mode The trigger_mode: free, auto, normal, or tag.
     * \param level The magnitude of the trigger even for auto or normal modes.
     * \param channel Which input channel to use for the trigger events.
     * \param tag_key The name (as a string) of the tag to trigger off
     *                of if using the tag mode.
     */
    virtual void set_trigger_mode(trigger_mode mode,
                                  float level,
                                  int channel,
                                  const std::string& tag_key = "") = 0;
 
    virtual std::string title() = 0;
    virtual std::string line_label(unsigned int which) = 0;
    virtual std::string line_color(unsigned int which) = 0;
    virtual int line_width(unsigned int which) = 0;
    virtual int line_style(unsigned int which) = 0;
    virtual int line_marker(unsigned int which) = 0;
    virtual double line_alpha(unsigned int which) = 0;
 
    virtual void set_size(int width, int height) = 0;
 
    virtual void enable_menu(bool en = true) = 0;
    virtual void enable_grid(bool en = true) = 0;
    virtual void enable_autoscale(bool en = true) = 0;
    virtual void enable_control_panel(bool en = true) = 0;
    virtual void enable_max_hold(bool en) = 0;
    virtual void enable_min_hold(bool en) = 0;
    virtual void clear_max_hold() = 0;
    virtual void clear_min_hold() = 0;
    virtual void disable_legend() = 0;
    virtual void reset() = 0;
    virtual void enable_axis_labels(bool en = true) = 0;
 
    QApplication* d_qApplication;
};
 
} /* namespace qtgui */
} /* namespace gr */
 
#endif /* INCLUDED_QTGUI_FREQ_SINK_C_H */