GUI-in-Scilab/C2/Building-a-GUI-for-basic-plotting/English

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Title of script: Building a GUI for basic plotting.

Author: Rashmi Patankar and Iswariya Sasikumar

Visual Cue Narration

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Title Slide

Hello and welcome to the Spoken Tutorial on

“Building a GUI for basic plotting”.

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Learning Objectives



In this tutorial, we will learn:

  • About Checkbox.

  • Generate graphs of the sine and cosine functions using GUI.

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System Requirements




Only Narration


To record this tutorial, I am using

  • Windows 10 OS

  • Scilab 6.1.0 and

  • GUI Builder Toolbox 4.2.1

The process demonstrated in this tutorial is identical in Linux OS also.

Annotations are added to the tutorial if there are any differences.

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Pre-requisites


https://spoken-tutorial.org

To follow this tutorial:

  • The learner must have basic knowledge of Scilab and GUI Builder toolbox.

  • For pre-requisite Scilab tutorials please visit this website.

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Code Files



  • The files used in this tutorial are provided in the Code files link.

  • Please download and extract the files.

  • Make a copy and then use them while practising.

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What is Checkbox?

A Checkbox is a button with two states.

It is used when a user wants to make multiple independent choices.

Cursor on GUIBuilder Palette and Graphic window number 1


Let us begin with creating the GUI.

I have opened the GUIBuilder toolbox.

Cursor on GUIBuilder Palette,

click Checkbox.

Go to GUIBuilder Palette and click on Checkbox.

On Scilab Multiple Values Request window,

type chk_sine as Tag,

type sin(t) as String.

Click on OK.

Type chk_sine as the Tag and sin(t) as the String.



Then click on OK.

On Graphic window number 1,

place the Checkbox in the window's top left side.

Hover cursor over Checkbox.

Place the Checkbox in the window's top left side by considering a suitable size.


A sin(t) Checkbox appears. 

On GUIBuilder Palette,


hover over cos(t) Checkbox.


In the similar way, I have taken another Checkbox for the cosine function.

I have written chk_cosine as the Tag and cos(t) as the String.

By considering the suitable size, I have placed it below the sin(t) Checkbox.

Pause the tutorial and do likewise in your GUI interface.

On GUIBuilder Palette, To display the response of a system, we need Axes.

On Graphic window number 1,


hover over Axes.


Hence I have taken an Axes with ax_response as Tag and System Response as String.

Notice that I have placed it on the right side of the window.

It appears like a box with a black border.

Again, pause the tutorial and do likewise in your GUI interface.

Now the GUI part is completed. 

On GUIBuilder Palette window,


Generate>>Generate GUI code.

Let us generate the Scilab code file for this.

Go to the GUIBuilder Palette.

Click on Generate and then on the Generate GUI code.

Save as finding_wave.

Click on Save.

I will save this file as finding_wave.

Click on Save.

On GUI created window,

Click on OK.

A pop up opens with the message “GUI created successfully.”

Click on OK.

On SciNotes window,

highlight handles for sine, cosine and axes.

You can see that the corresponding Scilab code has been generated.

Notice the handles and properties of the objects we took on a graphic window.

Highlight handles.chk_sine. handles.chk_sine is the handle for sine Checkbox.
Highlight handles.chk_cosine. handles.chk_cosine is the handle for cosine Checkbox.
Highlight handles.ax_response. handles.ax_response is the handle for Axes.
Hover cursor over chk_sine_callback function. Now let us write a function definition within the chk_sine_callback function.

Cursor on SciNotes window,

type within chk_sine_callback.

Type,

t = 0:0.1:2*%pi;

if handles.chk_sine.Value == 1

then plot(t,sin(t))

else

plot(t,sin(t),'w')

end

Enter the code as seen here with the same syntax.

The same code can be found under the Code files section.

You can use it as explained earlier in this tutorial.







Highlight,

t = 0:0.1:2*%pi;

The first line defines the range of t from 0 to 2 pi with a step size of 0.1.

Highlight,

if handles.chk_sine.Value == 1

then plot(t,sin(t))

else

plot(t,sin(t),'w')

end

Further an if else statement is defined.

The checkbox for sin(t) is checked if the value is set to 1.

So, if it is checked then the response of the sine wave is plotted.

If it is unchecked, then an invisible response will be plotted with white color.



Cursor on SciNotes window,

type within chk_cosine_callback.

Type,

t = 0:0.1:2*%pi;

if handles.chk_cosine.Value == 1

then plot(t,cos(t))

else

plot(t,cos(t),'w')

end

Next I will write a function definition for chk_cosine_callback function.

Enter the code as seen here with the same syntax as explained earlier.

The same code can also be found under the Code files section.







Highlight,

t = 0:0.1:2*%pi;

The first line is the same as seen in the chk_sine_callback function.

It will define the range of ‘t’.

Highlight,

if handles.chk_cosine.Value == 1

then plot(t,cos(t))

else

plot(t,cos(t),'w')

end

Further an if else statement for cos(t) checkbox is defined.

This action is similar to what we have seen previously.

If the checkbox for cos(t) is checked, then it will plot the response of the cosine wave.

If it is unchecked, then an invisible response will be plotted with white color.



Press Ctrl+S. Now let us save the Scilab code by pressing Ctrl and S keys together.

On Scinotes window,

Execute>>file with echo.

To execute, click on Execute on the menu bar and then on file with echo.


On Graphic window number 2,

check the sin(t) checkbox.

Hover cursor over the Axes.

Now check the sin(t) checkbox.


You will see the time response of the sine function on the Axes.

On Graphic window number 2,

check the cos(t) checkbox.

Hover cursor over the Axes.

Let us now check the cos(t) checkbox.


Axes shows the time response of the cosine function along with the sine function.

On Graphic window number 2,

uncheck the sin(t) checkbox

check the sin(t) checkbox.


Now uncheck the sin(t) checkbox.

The response of sine function is not visible now.

If we check the sin(t) checkbox then the sine function response is again visible.

This way we can perform the basic plotting using GUI.

This brings us to the end of this tutorial. 

Let us summarise.

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Summary


In this tutorial, we have learnt:

  • About Checkbox.

  • Generated graphs of the sine and cosine functions using GUI.

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Assignment





As an assignment, please do the following.

  • Add two Checkboxes to the current GUI to find:

    • inverse of sin(t) and

    • inverse of cos(t)

  • Display the response of a system using an Axes.

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About Spoken Tutorial Project

The video at the following link summarises the Spoken Tutorial project.

Please download and watch it.

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Spoken Tutorial Workshops

We conduct workshops using Spoken Tutorials and give certificates.

Please contact us. 

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Answers for THIS Spoken Tutorial: 

Please post your timed queries in this forum.

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FOSSEE Forum

Please post your general and technical queries on Scilab in this forum.

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Textbook Companion project

The FOSSEE team coordinates the TBC project.

For more details, please visit this site.

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Lab Migration

The FOSSEE team coordinates the Lab Migration project.

For more details, please visit this site.

Show Slide: Acknowledgements The Spoken Tutorial project is funded by the Ministry of Education, Government of India.
Show Slide: Thank you

This is Iswariya Sasikumar, a FOSSEE intern 2021, IIT Bombay signing off.

Thanks for joining.

Contributors and Content Editors

Iswariyas

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