[Scilab-users] ?==?utf-8?q? GUI help

[Antoine Monmayrant]

Hello Claus,

I've been playing a bit with GUIs for teaching, so maybe I can help.
The issue is that I don't get what your problem is exactly here, so I my answer might be a bit off-topic.
Do not hesitate to rephrase your issue, I'll try a more focused answer.

Anywya, here is how I think your code could be improved:

(1) You can use 'calc' as the callback for all of the editable text field so that your result gets shown right away, without having to press a button.
(2) You should populate all the uicontrols of your gui first, then only update the displayed values, the visibility of the uicontrols, etc inside your calc function. (ie no more creating a uicontrol inside a callback)
(3) The 'tag' property of any uicontrol together with 'findobj()' are really nice to get/set the properties of each existing uicontrol.
(4) You can rely on a proper Model-View-Controler approach (or any other well established method to avoid mixing gui stuff with calculation stuff).

I attached a small gui I use to illustrate optical anti-reflection coating.
It is far from perfect (I did not implement a proper model-view-controler for example).
But you can see how I tried to separate the different parts of the code an how I use findobj/tag/get/set,  etc.

Hope it helps,

Antoine
 
Le Mercredi, Novembre 27, 2019 19:21 CET, Claus Futtrup <cfuttrup at gmail.com> a écrit: 
 
> Hi there
> 
> I'm trying to build a GUI. For simplicity on the forum, I've built a 
> really simple example of what I'm trying to do. How can I make the 
> "conditional" GUI output work and not have it inside the calc function? 
> ... or, how would you do it? Thanks.
> 
> Best regards, Claus.
> 
> // GUI_EXAMPLE.SCE
> //
> // Demo of how to build a simple GUI in Scilab.
> // Real simple, with two input variables and one output.
> // The example uses the basic mechanical example of a mass and a spring as
> // input parameters and calculates the resonance frequency of the mechanical
> // system.
> 
> // Initialize variables
> m  =  1;  // Moving mass 'm'(kilogram)
> k  =  1;  // Stiffness, spring constant 'k'(Newton per meter)
> fres  =  1;  // Resonance frequency (Hertz)
> show_result  =  %f;
> 
> function  calc()
>      m  =  evstr(get(ge_m,"string"));  // get content in uicontrol ge_m
>      k  =  evstr(get(ge_k,"string"));  // get content in uicontrol ge_k
>      fres  =  sqrt(m  *  k);
>      // putting GUI updates inside the calculation routine is not pretty code.
>      uicontrol("style","text","string","Result :","position",  ..
>                [10  as(2)-110  80  20]);
>      uicontrol("style","text","string",string(fres),  ..
>                "position",[100  as(2)-110  80  20]);
>      uicontrol("style","text","string","Hz ","position",  ..
>                [200  as(2)-110  30  20]);
>      show_result  =  %t;
>      // update global variables
>      [m,k,fres,show_result]=return(m,k,fres,show_result);
> endfunction
> 
> function  goodbye()
>      close(ge);  // Close GUI window
>      printf("Resulting fres: %f Hertz\n",fres);
>      abort  // Print result in console (e.g. for copy/paste), then kill the app
> endfunction
> 
> ge  =  scf();  // GUI Example, Initialize and 'set current figure'
> as  =  ge.axes_size;  // read size of window, as = [width height]
> ge.figure_name  =  "GUI Example";  // Change window header
> 
> uicontrol("style","text","string","Moving mass :","position",  ..
>            [10  as(2)-35  80  20],"background",[1  1  1]);  // white background
>            // position properties has four parameters = x,y,width,height
>            // y-position counts from lower left corner, so we subtract from 'as'
> ge_m  =  uicontrol("style","edit","string",string(m),  ..
>            "position",[100  as(2)-35  80  20]);
> uicontrol("style","text","string","kg ","position",  ..
>            [200  as(2)-35  30  20],"background",[1  1  1]);
> 
> uicontrol("style","text","string","Stiffness :","position",  ..
>            [10  as(2)-60  80  20],"background",[1  1  1]);
> ge_k  =  uicontrol("style","edit","string",string(k),  ..
>            "position",[100  as(2)-60  80  20]);
> uicontrol("style","text","string","N/m ","position",  ..
>            [200  as(2)-60  30  20],"background",[1  1  1]);
> 
> uicontrol("style","pushbutton","string","Calculate",  ..
>            "position",[10  as(2)-85  80  20],"callback","calc");
> 
> // How do I make this "conditional"output show up in my GUI?
> if  show_result  then  // If "Calculate"button was pushed at least once ...
>      uicontrol("style","text","string","Result :","position",  ..
>                [10  as(2)-110  80  20]);
>      uicontrol("style","text","string",string(fres),  ..
>                "position",[100  as(2)-110  80  20]);
>      uicontrol("style","text","string","Hz ","position",  ..
>                [200  as(2)-110  30  20]);
> end
> 
> uicontrol("style","pushbutton","string","Exit",  ..
>            "position",[10  as(2)-135  80  20],"callback","goodbye");
>
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