diff options
Diffstat (limited to 'gr-qtgui/include/gnuradio/qtgui/freq_sink_c.h')
| -rw-r--r-- | gr-qtgui/include/gnuradio/qtgui/freq_sink_c.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/gr-qtgui/include/gnuradio/qtgui/freq_sink_c.h b/gr-qtgui/include/gnuradio/qtgui/freq_sink_c.h index fcbfd72ec3..c2f50686f0 100644 --- a/gr-qtgui/include/gnuradio/qtgui/freq_sink_c.h +++ b/gr-qtgui/include/gnuradio/qtgui/freq_sink_c.h @@ -46,6 +46,21 @@ namespace gr { * different color, and the \a set_title and \a set_color * functions can be used to change the lable and color for a given * input number. + * + * 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. + * + * - freq (output): + * Produces a PMT pair with (intern("freq"), double(frequency). + * When a user double-clicks on the display, the frequency + * that the cursor is on is used to retune the x-axis scale + * to recenter onto the clicked frequency. A message + * containing the new frequency is also produced and can be + * used by other blocks to update their frequency setting. */ class QTGUI_API freq_sink_c : virtual public sync_block { |