[Scilab-users] ?= GUI hel
Stéphane Mottelet
stephane.mottelet at utc.fr
Fri Nov 29 19:21:14 CET 2019
Le 29/11/2019 à 19:17, Claus Futtrup a écrit :
> Hi Stéphane
>
> Hm, you're right. This actually fixes the problem, but I do find it to
> be a strange "solution" that you write each of them to be equal with
> itself ... I prefer calling the set() function.
In "ge_fs=ge_fs" the lhs is a local copy and the rhs the variable in the
calling context.
>
> Cheers,
> Claus
>
> On 29.11.2019 19:05, Stéphane Mottelet wrote:
>> To makeit work, just insert
>>
>> ge_r=ge_r;
>> ge_fs=ge_fs;
>> ge_hz=ge_hz;
>>
>> at the begining of function calc.
>>
>> My two cents...
>>
>> S.
>>
>>
>> Le 29/11/2019 à 18:58, Claus Futtrup a écrit :
>>> Hi Antoine
>>>
>>> >Not much progress because I never managed to get a minimal working example
>>> I can repeat my example again and again. It never works. Please see
>>> it below.
>>>
>>> Do you agree. This consistently fails if you run it from Scinotes
>>> editor ... but if I copy e.g. ge_r.visible = "on" to the command
>>> line (not from within the calc function), then it shows up.
>>>
>>> /Claus
>>>
>>> // BAD_GUI_EXAMPLE.SCE
>>> //
>>> // Demo of how _NOT_ to build a simple GUI in Scilab.
>>>
>>> // Initialize variables
>>> m = 1; // Moving mass 'm'(kilogram)
>>> k = 1; // Stiffness, spring constant 'k'(Newton per meter)
>>> fres = 1; // Resonance frequency (Hertz)
>>>
>>> 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(k/m)/(2*%pi);
>>> // putting GUI updates inside the calculation routine is not pretty
>>> code.
>>> ge_r.visible = "on";
>>> ge_fs.visible = "on"; // THIS DOESN'T WORK
>>> ge_hz.visible = "on";
>>> // set(ge_r,"Visible","on"); // THIS WORKS
>>> // set(ge_fs,"Visible","on");
>>> // set(ge_hz,"Visible","on");
>>> // update global variables
>>> [m,k,fres]=return(m,k,fres);
>>> 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");
>>>
>>> ge_r = uicontrol("style","text","string","Result :","position", ..
>>> [10 as(2)-110 80 20],"visible","off"); // keep these hidden for a start
>>> ge_fs = uicontrol("style","text","string",string(fres), ..
>>> "position",[100 as(2)-110 80 20],"visible","off");
>>> ge_hz = uicontrol("style","text","string","Hz ","position", ..
>>> [200 as(2)-110 30 20],"visible","off");
>>>
>>> uicontrol("style","pushbutton","string","Exit", ..
>>> "position",[10 as(2)-135 80 20],"callback","goodbye");
>>>
>>> On 29.11.2019 10:20, Antoine Monmayrant wrote:
>>>> Le Jeudi, Novembre 28, 2019 19:40 CET, Claus Futtrup<cfuttrup at gmail.com> a écrit:
>>>>
>>>>> Hi Antoine
>>>>>
>>>>> Also, you should better use get(a, 'propertyName') or set(a, 'propertyName', value) instead of a.propertyName and a.propertyName=value in your callbacks.
>>>>>
>>>>>
>>>>> I see what you mean. I just now had trouble turning visibility on/off,
>>>>> but using set(), it works fine. Thanks for the tip.
>>>> It's something quite weird, maybe a race condition.
>>>> I've seen it when using 'a.prop' or 'a.prop=value' syntax in either a callback function or in a for loop.
>>>> When you repeatedly use this syntax, scilab tends to forget that 'a' exists and that it's a handle with different properties.
>>>> The initial bug report is here:http://bugzilla.scilab.org/show_bug.cgi?id=15786
>>>> Not much progress because I never managed to get a minimal working example (it's an Heisenbug).
>>>>
>>>> Antoine
>>>>
>>>>> Best regards,
>>>>> Claus
>>>>>
>>>>> On 28.11.2019 17:47, Antoine Monmayrant wrote:
>>>>>> Le Jeudi, Novembre 28, 2019 17:05 CET, Claus Futtrup<cfuttrup at gmail.com> a écrit:
>>>>>>
>>>>>>> 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);
>>>>>> You are right.
>>>>>> Also, the trick to disable the callback function/ reenable it is key for sliders that tend to generate an avalanche of call to the function when one moves the cursor.
>>>>>>
>>>>>>> 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.
>>>>>> I think you can achieve what you want by setting ".visible='off'" for all the uicontrols you don't want to show initialy. You can then set ".visible='on'" after the first call to the callback (or at each call if you are lazy).
>>>>>>
>>>>>>> 3) I will look into this. Thanks for the tip.
>>>>>> Also, you should better use get(a, 'propertyName') or set(a, 'propertyName', value) instead of a.propertyName and a.propertyName=value in your callbacks.
>>>>>> I have found that this latter syntax is causing a lot of bug if your callback get called really often. I still don't know why.
>>>>>>
>>>>>>> 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?
>>>>>> Hmm, that would be a good idea.
>>>>>> I'll see whether I can put something together.
>>>>>> The thing is, MVC approach looks rather silly and overengineered on a small example.
>>>>>>
>>>>>>> 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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>> --
>> Stéphane Mottelet
>> Ingénieur de recherche
>> EA 4297 Transformations Intégrées de la Matière Renouvelable
>> Département Génie des Procédés Industriels
>> Sorbonne Universités - Université de Technologie de Compiègne
>> CS 60319, 60203 Compiègne cedex
>> Tel : +33(0)344234688
>> http://www.utc.fr/~mottelet
>>
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--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet
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