[Scilab-users] ?==?utf-8?q? GUI help
Claus Futtrup
cfuttrup at gmail.com
Thu Nov 28 17:05:24 CET 2019
Hi Antoine, et al.
Your reply is very helpful, so I think you got the right question :-)
1) Good point that I can use callback on every uicontrol. This would be
suitable for a simple example (like gui_example.sce) ... but for heavy
calculations, it might be more practical with a CALC button. P.S. The
correct equation for the resonance frequency is fres=sqrt(k/m)/(2*%pi);
2) I see what you mean, so not having an empty space, but "show" the
whole she-bang from the beginning. I didn't want to do that (just
deleting the IF-statement), but it could be the best solution in the end
(rather than the inline GUI updates), if nothing better shows up. This
was somehow the "core" of my question. Maybe I ask for too much.
3) I will look into this. Thanks for the tip.
4) I will also look into this. My problem is the steep learning curve.
If you look at the Scilab tutorials you have the good-old Openeering
LHY_Tutorial - it's incredibly complicated and long. Is LHY_Tutorial
using the Model-Viewer-Controller approach? - Maybe the
Model-Viewer-Controller could be presented in a _simple_ tutorial - is
it possible?
I appreciate gui_example.sce with just about 70 lines of code, two
inputs and one output. I think something like it could help a lot of
people ... and it's not 250 lines of code to get a GUI up and running,
if you know what I mean. The gui_example shows a few differences, like
white versus grey background, editable boxes, etc. In the outputs,
because of the default grey background, you can see the dimensions of
the grid / text-boxes, and gui_example has two buttons. It looks
operational and easy to expand for new users.
Cheers,
Claus
On 28.11.2019 08:57, Antoine Monmayrant wrote:
> 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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