This tutorial shows how to create a graphical user interface (GUI) in Scilab for a differential equation model of LHY dynamics. The GUI allows the user to modify model parameters, simulation time settings, and initial conditions. It contains frames to edit these values, a compute button to run the simulation, and a plot to display the results. The tutorial walks through creating each GUI component using Scilab's uicontrol function and building out the interface.
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1. www.openeering.com
powered by
HOW TO DEVELOP A GRAPHICAL USER INTERFACE
(GUI) IN SCILAB.
In this tutorial we show how to create a GUI in Scilab for an ODE problem.
The adopted problem is the LHY model already used in other tutorials.
Level
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
2. LHY Tutorial Gui www.openeering.com page 2/18
Step 1: The purpose of this tutorial
In this tutorial we show, step by step, how to create a Graphical User
Interface (GUI)in Scilab.
Examples of Scilab GUIs are reported on the right. These images are
taken from the GUI menu of the Scilab Demonstrations.
Step 2: Model description
In this tutorial we refer to the LHY model. A description of the LHY model
and its solution using ode command can be found in the basic tutorial of
modeling differential equations in Scilab.
3. LHY Tutorial Gui www.openeering.com page 3/18
Step 3: Roadmap
In this tutorial we describe how to construct a GUI for the LHY. We
implement the system in the following way:
Provide a description of GUI programming in Scilab;
Implement the GUI for the LHY model;
Test the program and visualize the results.
Descriptions Steps
GUI programming in Scilab 4-5
GUI for the LHY model 6-17
Running and testing 18-19
Step 4: Scilab GUI programming
A GUI is a human-computer interface that uses graphical objects like
windows, menus and icons to interact with users through the use of
mouse and keyboard (often in a limited way).
The main advantage of using GUIs is the ability to make computer
operations more intuitive, and thus easier to learn and use especially for
new users. For example, it is much easier to move files by dragging icons
with the mouse than by having to remember the command that performs
the same task.
The function that creates a graphical user interface object in Scilab is
"uicontrol".
The syntax of the GUI function is
h = uicontrol(PropertyName,PropertyValue,...)
h = uicontrol(parent,PropertyName,PropertyValue,...)
h = uicontrol(uich)
For a detailed description see "help uicontrol".
4. LHY Tutorial Gui www.openeering.com page 4/18
Step 5: Design of the GUI interface
The first step is to design the skeleton of the GUI interface for the LHY
model.
Designing a “correct” GUI is not a trivial task. Many rules exist and can be
found in textbooks and web sites dedicated to this subject.
On the right we report our scheme for the LHY graphical user interface
where:
"Model parameters" contains the list of all LHY model
parameters that the user can change;
"Time Setting" contains the list of all time simulation variables;
"Initial conditions" contains the list of all initial conditions
for the ODE problem;
"graphical plot " contains the plot of the simulation’s results;
"Compute button" updates the solution in the "graphical
plot ";
The menu "file" contains the entry "close" that is used to close
the program;
The menu "About" contains the entry "About" that is used to
display some info about program and author.
5. LHY Tutorial Gui www.openeering.com page 5/18
Step 6: Storing default parameters
The first step is to store all the default LHY model parameters into mlist
Scilab objects. The parameters are subdivided into two groups:
the "param" group for the LHY model parameters;
the "sim" group for the simulation time parameters and initial
conditions.
// Default simulation parameters
param = [];
param.tau = 5e4; // Number of innovators per year (initiation)
param.s = 0.61; // Annual rate at which light users attract non-
users (initiation)
param.q = 3.443; // Constant which measures the deterrent effect
of heavy users (initiation)
param.smax = 0.1; // Lower bound for s effective (initiation)
param.a = 0.163; // Annual rate at which light users quit
param.b = 0.024; // Annual rate at which light users escalate to
heavy use
param.g = 0.062; // Annual rate at which heavy users quit
param.delta = 0.291; // Forgetting rate
// Simulation data
// Time variables
sim = [];
sim.Tbegin = 1970; // Initial time
sim.Tend = 2020; // Final time
sim.Tstep = 1/12; // Time step
// Initial conditions
sim.L0 = 1.4e6; // Light users at the initial time
sim.H0 = 0.13e6; // Heavy users at the initial time
sim.Y0 = 0.11e6; // Decaying heavy user at the initial time
The name of the developed function is "LHY_Gui".
6. LHY Tutorial Gui www.openeering.com page 6/18
Step 7: Create an initial window
In the next step we create, with the "scf" Scilab function, an initial window
where graphical object can be added.
The function "gettext" is used for internationalization (a.k.a. i18n, i.e. it
translates the text into the current local language if available).
// Global window parameters
global margin_x margin_y;
global frame_w frame_h plot_w plot_h;
// Window Parameters initialization
frame_w = 300; frame_h = 550;// Frame width and height
plot_w = 600; plot_h = frame_h;// Plot width and heigh
margin_x = 15; margin_y = 15;// Horizontal and vertical margin
for elements
defaultfont = "arial"; // Default Font
axes_w = 3*margin_x + frame_w + plot_w;// axes width
axes_h = 2*margin_y + frame_h; // axes height (100 =>
toolbar height)
demo_lhy = scf(100001);// Create window with id=100001 and make
it the current one
// Background and text
demo_lhy.background = -2;
demo_lhy.figure_position = [100 100];
demo_lhy.figure_name = gettext("LHY solution");
// Change dimensions of the figure
demo_lhy.axes_size = [axes_w axes_h];
Type “help scf” for more details on the scf command.
7. LHY Tutorial Gui www.openeering.com page 7/18
Step 8: Set menu and toolbar
After creating the window, we create the menu. The used function are:
"addmenu"/"delmenu": for adding or removing a menu from the
menu bar;
"uimenu": for creating a menu or a submenu in a figure.
Associate to each menu entry there is a callback, a reference to a
executable function that is activated when the user select the
entry.
// Remove Scilab graphics menus & toolbar
delmenu(demo_lhy.figure_id,gettext("&File"));
delmenu(demo_lhy.figure_id,gettext("&Tools"));
delmenu(demo_lhy.figure_id,gettext("&Edit"));
delmenu(demo_lhy.figure_id,gettext("&?"));
toolbar(demo_lhy.figure_id,"off");
// New menu
h1 = uimenu("parent",demo_lhy, "label",gettext("File"));
h2 = uimenu("parent",demo_lhy, "label",gettext("About"));
// Populate menu: file
uimenu("parent",h1, "label",gettext("Close"), "callback",
"demo_lhy=get_figure_handle(100001);delete(demo_lhy);",
"tag","close_menu");
// Populate menu: about
uimenu("parent",h2, "label",gettext("About"),
"callback","LHY_About();");
// Sleep to guarantee a better display (avoiding to see a
sequential display)
sleep(500);
An import field for the graphical function is the “parent” field i.e. the
handle where the graphical object should be attached, in our case
“demo_lhy”. Changing this value allows to move a control from a figure to
another.
See “uimenu” help file for more details.
8. LHY Tutorial Gui www.openeering.com page 8/18
Step 9: About dialog
The “About” dialog is a modal dialog created using the "messagebox"
function. Two types of windows are available:
"modal dialog": in a modal window users are required to interact
with it before it returns to the parent application.
"modeless dialog": in modeless or non-modal window the
request information is not essential to continue with the program.
A non-modal window can be left open while work continues
elsewhere.
function LHY_About()
msg = msprintf(gettext("LHY is developed by the Openeering
Team.nAuthor: M. Venturin"));
messagebox(msg, gettext("About"), "info", "modal");
endfunction
Step 10: Creating a frame
A frame is graphical object used to group other objects.
// Frames creation [LHY parameters]
my_frame = uicontrol("parent",demo_lhy, "relief","groove", ...
"style","frame", "units","pixels", ...
"position",[ margin_x margin_y frame_w frame_h], ...
"horizontalalignment","center", "background",[1 1 1], ...
"tag","frame_control");
// Frame title
my_frame_title = uicontrol("parent",demo_lhy, "style","text", ...
"string","LHY parameters", "units","pixels", ...
"position",[30+margin_x margin_y+frame_h-10 frame_w-60 20],
...
"fontname",defaultfont, "fontunits","points", ...
"fontsize",16, "horizontalalignment","center", ...
"background",[1 1 1], "tag","title_frame_control");
9. LHY Tutorial Gui www.openeering.com page 9/18
Step 11: Populate the frame
Each parameters is composed of the following elements:
a string that denote the parameter (style “text”);
an edit box (style “edit”) that is used as an input/output mask (the
input is recovering by searching all graphical objects having that
tag, and hence the tag must be unique among the elements)
// Adding model parameters
guih1 = frame_w;
guih1o = 240;
// ordered list of labels
labels1 = ["Tau", "s", "q", "smax", "a", "b", "g", "delta"];
// ordered list of default values
values1 = [5e4, 0.61, 3.443, 0.1, 0.163, 0.024, 0.062, 0.291];
// positioning
l1 = 40; l2 = 100; l3 = 110;
for k=1:size(labels1,2)
uicontrol("parent",demo_lhy, "style","text",...
"string",labels1(k), "position",[l1,guih1-
k*20+guih1o,l2,20], ...
"horizontalalignment","left", "fontsize",14, ...
"background",[1 1 1]);
guientry1(k) = uicontrol("parent",demo_lhy, "style","edit",
...
"string",string(values1(k)), "position",[l3,guih1-
k*20+guih1o,180,20], ...
"horizontalalignment","left", "fontsize",14, ...
"background",[.9 .9 .9], "tag",labels1(k));
end
11. LHY Tutorial Gui www.openeering.com page 11/18
Step 13: Add a button
Next, using the same command “uicontrol”, we add the “compute button”
(style “pushbutton”):
// Adding button
huibutton = uicontrol(demo_lhy, "style","pushbutton", ...
"Position",[110 100 100 20], "String","Compute", ...
"BackgroundColor",[.9 .9 .9], "fontsize",14, ...
"Callback","syscompute");
The button is associated to the callback "syscompute". This callback will
be explained and created at step 17.
Step 14: Solving function
The solving function is based on the code already developed in the tutorial
of the LHY model solved using "ode" function. See this tutorial for more
details.
function sol=solvingProblem(param, sim)
// Compute the solution
sol = struct();
// Assign ODE solver data
y0 = [sim.L0;sim.H0;sim.Y0];
t0 = sim.Tbegin;
t = sim.Tbegin:sim.Tstep:(sim.Tend+100*%eps);
f = LHY_System;
// Solving the system
sol.LHY = ode(y0, t0, t, f);
sol.t = t;
endfunction
12. LHY Tutorial Gui www.openeering.com page 12/18
Step 15: Display function
The display functions is derived from the "LHY_Plot" function of the
tutorial on LHY solved using "ode" function. See this tutorial for more
details.
function displayProblem(solh)
// Fetching solution
LHY = sol.LHY;
t = sol.t;
L = LHY(1,:); H = LHY(2,:); Y = LHY(3,:);
// Evaluate initiation
I = LHY_Initiation(L,H,Y, param);
// maximum values for nice plot
[Lmax, Lindmax] = max(L); tL = t(Lindmax);
[Hmax, Hindmax] = max(H); tH = t(Hindmax);
[Ymax, Yindmax] = max(Y); tY = t(Yindmax);
[Imax, Iindmax] = max(I); tI = t(Iindmax);
// Text of the maximum point
Ltext = msprintf(' ( %4.1f , %7.0f)',tL,Lmax);
Htext = msprintf(' ( %4.1f , %7.0f)',tH,Hmax);
Ytext = msprintf(' ( %4.1f , %7.0f)',tY,Ymax);
Itext = msprintf(' ( %4.1f , %7.0f)',tI,Imax);
// Plotting of model data
delete(gca());
plot(t,[LHY;I]);
legend(['Light Users';'Heavy users';'Memory';'Initiation']);
// Vertical line
set(gca(),"auto_clear","off");
xpolys([tL,tH,tY,tI;tL,tH,tY,tI],[0,0,0,0;Lmax,Hmax,Ymax,Imax]);
// Text of maximum point
xstring(tL,Lmax,Ltext); xstring(tH,Hmax,Htext);
xstring(tY,Ymax,Ytext); xstring(tI,Imax,Itext);
xlabel('Year');
set(gca(),"auto_clear","on");
my_plot_axes = gca();
my_plot_axes.title.font_size = 5;
my_plot_axes.axes_bounds = [1/3,0,2/3,1];
my_plot_axes.title.text = "LHY solution";
endfunction
13. LHY Tutorial Gui www.openeering.com page 13/18
Step 16: Default initial plot
The last step for "LHY_Gui" is to compute the solution with the default
data and to re-draw the window.
// Compute solution
sol = solvingProblem(param, sim);
// Redraw window
drawlater();
newaxes();
displayProblem(sol);
drawnow();
14. LHY Tutorial Gui www.openeering.com page 14/18
Step 17: Linking the computational function to the button
The "syscompute" function is associated to the “Compute button” (see
step 13) and performs the following steps:
it retrieves data from the object framework: this process is done
by the function "findobj" that searches from all graphical objects
those having the prefixed target tag;
it evaluates the available data in the field converting these data
from string into real using the function "evstr";
it performs the simulation with the "solvingProblem" function;
it redraws the window.
function syscompute
// retrive data
param = [];
tau = findobj("tag", "Tau"); param.tau = evstr(tau.string);
s = findobj("tag", "s"); param.s = evstr(s.string);
q = findobj("tag", "q"); param.q = evstr(q.string);
smax = findobj("tag", "smax"); param.smax =
evstr(smax.string);
a = findobj("tag", "a"); param.a = evstr(a.string);
b = findobj("tag", "b"); param.b = evstr(b.string);
g = findobj("tag", "g"); param.g = evstr(g.string);
delta = findobj("tag", "delta"); param.delta =
evstr(delta.string);
sim = [];
Tbegin = findobj("tag", "Tbegin");sim.Tbegin =
evstr(Tbegin.string);
Tend = findobj("tag", "Tend"); sim.Tend = evstr(Tend.string);
Tstep = findobj("tag", "Tstep"); sim.Tstep =
evstr(Tstep.string);
L0 = findobj("tag", "L0"); sim.L0 = evstr(L0.string);
H0 = findobj("tag", "H0"); sim.H0 = evstr(H0.string);
Y0 = findobj("tag", "Y0"); sim.Y0 = evstr(Y0.string);
// Compute solution
sol = solvingProblem(param, sim);
// Redraw window
drawlater();
my_plot_axes = gca();
my_plot_axes.title.text = "LHY solution";
newaxes();
displayProblem(sol);
drawnow();
endfunction
15. LHY Tutorial Gui www.openeering.com page 15/18
Step 18: Running and testing #1
Change the Scilab working directory to the current project working
directory and run the command exec('LHY_MainGui.sce',-1).
This command runs the main program and plots a chart similar to the one
shown on the right.
Step 19: Running and testing #2
Since we have used the function "evstr" it is possible to insert
expression in the input masks and see, in an easy way, the effects of
parameters changing in the solution.
For example, on the right we have reported the simulation where the
parameters b 0.024 3.2 and δ 0.291 exp 3.2 .
16. LHY Tutorial Gui www.openeering.com page 16/18
Step 20: Exercise #1
Try to modify the program adding the following feature: Every time the
“compute button” is pressed the program check if the LHY parameters are
changed with respect to the default values and if a parameter is changed
then the associated input mask is colored using the orange color as
depicted in the figure.
Step 20: Exercise #1 (Hints)
Some hints:
copy the mlist data "param" and "sim" into a global data structure
and save the name of their fields;
add a "updatedFields" function into the "syscompute"
function;
write the "updatedFields" function.
// global default data
global gparam gsim pf sf;
gparam = param;
gsim = sim;
// param and sim fields
pf = fieldnames(gparam); // param fields
sf = fieldnames(gsim); // sim fields
// Update fields
updateFields(param, sim);
17. LHY Tutorial Gui www.openeering.com page 17/18
function updateFields(param, sim)
global gparam gsim pf sf
// Loop over gparam/param elements
for i=1:size(pf,1)
// Get current field
cf = pf(i);
// check if they are different
checkequal = 0;
if(abs(gparam(cf)-param(cf))<= 1e-12) then
checkequal = 1;
end
// Find object
obj = findobj("tag", cf);
if(isempty(obj)) then
// object not found, skip, some problems?
continue;
end
// Colorize
if(~checkequal) then
// Object is modified: use new color
obj.BackgroundColor = [0.98 0.83 0.71];
else
// Object is not modified: use default color
obj.BackgroundColor = [.9 .9 .9];
end
end
// The same code for the field gsim/sim
endfunction
Step 21: Concluding remarks and References
In this tutorial we have shown how a GUI can be developed for the LHY
model.
On the right-hand column you may find a list of references for further
studies.
1. Scilab Web Page: Available: www.scilab.org.
2. Openeering: www.openeering.com.
18. LHY Tutorial Gui www.openeering.com page 18/18
Step 22: Software content
To report a bug or suggest some improvement please contact Openeering
team at the web site www.openeering.com.
Thank you for your attention,
Manolo Venturin
-------------------
GUI MODEL IN SCILAB
-------------------
----------------
Directory: model
----------------
LHY_Color_Gui.sci : GUI for the LHY model (ex. 1)
LHY_Gui.sci : GUI for the LHY model
LHY_Initiation.sci : Initiation function
LHY_System.sci : LHY system
--------------
Main directory
--------------
LHY_MainGui.sce : Main console GUI program
LHY_MainGuiColor.sce : Solution of the exercise
license.txt : The license file