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<cfutt...@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<cfutt...@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<cfutt...@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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