11.3. The Monitor in Photon

Linux and QNX Tools Demo and Tutorials : Version 6.4
	Chapter 11. PID Emulator and Monitor Functions

All the functions for the Monitor in Photon are explained in in Tutorial One, Chapter 8, Photon Functions (in phsimple.g), in these sections:

Section 8.2, “The Monitor Window - create_monitor”

Section 8.3, “Button Functions - toggle_sym, change_settings” (but not change_settings^[14])

Section 8.4, “Callback Functions - slider_callback, num_callback” (but not num_callback^[15])

Section 8.5, “Trend Functions - accumulate_trends, update_trends”

The complete file for the Monitor in Photon can be found in Section 3.7, “phmonitor.g - The Monitor program in Photon”.

11.3.1. Differences between Tutorial One and Tutorial Two

The following Cogent Tools Demo functions were modified in Tutorial One because for that tutorial we didn't want to have to call any abstracted functions. Here you will notice that they do make calls to abstracted functions.

11.3.1.1. `update_trends`

The only difference between this function and the update_trends function documented in Tutorial One is the use of the abstracted function .put_data to assign the array of values to the PtTrend or RtTrend widget.

   /*--------------------------------------------------------------------
    * Function:    update_trends
    * Returns:     t or nil
    * Description: Assigns the most recent arrays to the trend widget.
    *------------------------------------------------------------------*/
   function update_trends (widget, syms...)
   {
     local        tarray = make_array (length(syms)), i = 0, sym;
   
     with sym in syms do
       tarray[i++] = getprop (sym, #tdata);
     widget.put_data(tarray);
     with sym in syms do
       shorten_array (getprop (sym, #tdata), 0);
   }

11.3.1.2. `create_monitor`

The only difference between this function and the create_monitor function documented in Tutorial One is the use of the abstracted function anyos_assign to select the correct widget file.

   /*--------------------------------------------------------------------
    * Function:    create_monitor
    * Returns:     doesnt' return
    * Description: Creates the Monitor window.
    *------------------------------------------------------------------*/
   function create_monitor ()
   {
     local wfile, window, monitor_win, slidesp, progmv, progpv;
     local slideauto, slidedp, numkp, numki, numkd, numprop, numint;
     local butam, butgood, butpoor, butosc, butout, butx;
     
     wfile = PhabReadWidgetFile(anyos_assign("monitor_widgetfile"));
     . . .

^[14]The Tutorial One function change_settings is abstracted in Tutorial Two, and named anyos_change_settings in Tutorial Two.

^[15]The Tutorial One function num_callback is abstracted in Tutorial Two, and named anyver_numeric_callback in Tutorial Two.


11.2. The Monitor in GTK		Chapter 12. Controller Functions