[Scilab-users] Help write simple GUI

[Claus Futtrup]

Hi there

I hope someone can help me make a simple GUI front end to my script,
preferably without using GUI Builder or guimaker, because I think I'll
understand better without using additional tools.

The GUI - a window containing two variable input:
1. text + input box + text
Again the input is a number, typically an integer (as in "system
power : 100 Watt"). 100 being the user variable input.
2. text + input box + text
A number, typically an intereger (as in "impedance : 8 ohm"). 8
being the user variable input.

The script will then based on 100 Watt into 8 ohm calculate the voltage
= sqrt(100*8). I will round the number to one decimal, convert it to a
string and create an answer, like "Input level : 28.3 Volt".

The GUI should contain two buttons, e.g. an OK + a QUIT button. The OK
button runs the calculations. The quit button quits the script (may as
well quit Scilab).

I've studied the GUI controls in Scilab already and I understand the the
old way of making a new window is:

f = figure();

but it seems there's a new command in Scilab 5.5.0:

f = createWindow();

The new method probably has its advantages, but the Scilab manual
doesn't really explain... can anybody explain to me?

Can you use the same uicontrol commands with both methods? (can I use
examples found on the internet using "figure" and just replace figure
with createWindow?). It seems to me that the examples in the
createWindow gives uicontrol some inputs named "units" - "normalized" -
etc. - which are not present when looking at old figure() examples.

My next question will be, how do I create a uicontrol which accepts a
string input (as I need 2 of those). The uicontrol documentation says
the "Edit" style will do that. Funny, but also a bit strange, that you
can find all sorts of examples for using uicontrol with checboxes,
listboxes, radiobuttons, pushbuttons, tables etc. - but no examples are
provided with this most useful editable string input ... (???)

... hereafter I expect to evaluate the two strings (or if they're
returned as numbers, that's fine of course, I just don't need the script
to crash if something is not right). Then execute my code.

Best regards,
Claus

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[Antoine ELIAS]

Hi Claus,

For small dialogs to ask inputs, use *x_mdialog* function ( http://help.scilab.org/docs/5.5.0/fr_FR/x_mdialog.html )

function result = compute_voltage()
txt = ['Power (Watt)';'Impedance (ohm)'];
values = *x_mdialog*('System values',txt,['100';'8'])
if values <> [] then
w = values(1);
o = values(2);
w = eval(w);
o = eval(o);

if typeof(w) <> "constant" | int(w) <> w | typeof(o) <> "constant" | int(o) <> o then
error("bad value, integer values expected");
end

result = sqrt(w * o);
else
result = [];
end
endfunction

voltage = compute_voltage()

Antoine

Post by Claus Futtrup
Hi there
I hope someone can help me make a simple GUI front end to my script, preferably without using GUI Builder or guimaker, because I think I'll understand better without using additional tools.
1. text + input box + text
Again the input is a number, typically an integer (as in "system power : 100 Watt"). 100 being the user variable input.
2. text + input box + text
A number, typically an intereger (as in "impedance : 8 ohm"). 8 being the user variable input.
The script will then based on 100 Watt into 8 ohm calculate the voltage = sqrt(100*8). I will round the number to one decimal, convert it to a string and create an answer, like "Input level : 28.3
Volt".
The GUI should contain two buttons, e.g. an OK + a QUIT button. The OK button runs the calculations. The quit button quits the script (may as well quit Scilab).
f = figure();
f = createWindow();
The new method probably has its advantages, but the Scilab manual doesn't really explain... can anybody explain to me?
Can you use the same uicontrol commands with both methods? (can I use examples found on the internet using "figure" and just replace figure with createWindow?). It seems to me that the examples in
the createWindow gives uicontrol some inputs named "units" - "normalized" - etc. - which are not present when looking at old figure() examples.
My next question will be, how do I create a uicontrol which accepts a string input (as I need 2 of those). The uicontrol documentation says the "Edit" style will do that. Funny, but also a bit
strange, that you can find all sorts of examples for using uicontrol with checboxes, listboxes, radiobuttons, pushbuttons, tables etc. - but no examples are provided with this most useful editable
string input ... (???)
... hereafter I expect to evaluate the two strings (or if they're returned as numbers, that's fine of course, I just don't need the script to crash if something is not right). Then execute my code.
Best regards,
Claus
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[Claus Futtrup]

Hi Antoine

Thank you for your suggestion, which almost does what I need. The users
are not necessarily Scilab users, so I'd like a user interface where the
result is also displayed.

I realize I could show a messagebox with the result.

What I'd like to do requires a single window/figure where input and
output is shown + a QUIT button so that the user always only sees one
single frame / user interface, as an application / for simplicity (no
Scilab).

Later I will add a noise spectrum simulation + a filter - e.g. 2. order
high-pass butterworth at 2500 Hz. The filtered response will reduce the
voltage, but how much? The user should be informed about before + after
filter (3 inputs, 2 outputs) and dialog boxes is not as nice when it's
more complicated like this.

Best regards,
Claus

Post by Antoine ELIAS
Hi Claus,
For small dialogs to ask inputs, use *x_mdialog* function (
http://help.scilab.org/docs/5.5.0/fr_FR/x_mdialog.html )
function result = compute_voltage()
txt = ['Power (Watt)';'Impedance (ohm)'];
values = *x_mdialog*('System values',txt,['100';'8'])
if values <> [] then
w = values(1);
o = values(2);
w = eval(w);
o = eval(o);
if typeof(w) <> "constant" | int(w) <> w | typeof(o) <>
"constant" | int(o) <> o then
error("bad value, integer values expected");
end
result = sqrt(w * o);
else
result = [];
end
endfunction
voltage = compute_voltage()
Antoine

Post by Claus Futtrup
Hi there
I hope someone can help me make a simple GUI front end to my script,
preferably without using GUI Builder or guimaker, because I think
I'll understand better without using additional tools.
1. text + input box + text
Again the input is a number, typically an integer (as in "system
power : 100 Watt"). 100 being the user variable input.
2. text + input box + text
A number, typically an intereger (as in "impedance : 8 ohm"). 8
being the user variable input.
The script will then based on 100 Watt into 8 ohm calculate the
voltage = sqrt(100*8). I will round the number to one decimal,
convert it to a string and create an answer, like "Input level : 28.3
Volt".
The GUI should contain two buttons, e.g. an OK + a QUIT button. The
OK button runs the calculations. The quit button quits the script
(may as well quit Scilab).
I've studied the GUI controls in Scilab already and I understand the
f = figure();
f = createWindow();
The new method probably has its advantages, but the Scilab manual
doesn't really explain... can anybody explain to me?
Can you use the same uicontrol commands with both methods? (can I use
examples found on the internet using "figure" and just replace figure
with createWindow?). It seems to me that the examples in the
createWindow gives uicontrol some inputs named "units" - "normalized"
- etc. - which are not present when looking at old figure() examples.
My next question will be, how do I create a uicontrol which accepts a
string input (as I need 2 of those). The uicontrol documentation says
the "Edit" style will do that. Funny, but also a bit strange, that
you can find all sorts of examples for using uicontrol with
checboxes, listboxes, radiobuttons, pushbuttons, tables etc. - but no
examples are provided with this most useful editable string input ...
(???)
... hereafter I expect to evaluate the two strings (or if they're
returned as numbers, that's fine of course, I just don't need the
script to crash if something is not right). Then execute my code.
Best regards,
Claus
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Antoine ELIAS
Software developer
-----------------------
Scilab Enterprises
143bis rue Yves Le Coz - 78000 Versailles
Phone: [phone]
http://www.scilab-enterprises.com
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