Difference between revisions of "KTurtle/C3/Special-Commands-in-KTurtle/English-timed"
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Revision as of 14:11, 9 July 2014
| Time | Narration |
| 00:01 | Hello everybody. Welcome to this tutorial on Special Commands in KTurtle. |
| 00:08 | In this tutorial, we will learn about
|
| 00:15 | To record this tutorial I am using, Ubuntu Linux OS version. 12.04. KTurtle version. 0.8.1 beta. |
| 00:28 | We assume that you have basic working knowledge of KTurtle |
| 00:33 | If not, for relevant tutorials, please visit our website. http://spoken-tutorial.org |
| 00:39 | Let's open a new KTurtle Application. |
| 00:42 | Click on Dash home. |
| 00:44 | In the Search bar, type KTurtle. |
| 00:47 | Click on the KTurtle icon. |
| 00:50 | Let's first look at “learn” command |
| 00:53 | learn is a special command as it is used to create your own commands. |
| 01:01 | 'learn' Command can takes input and returns output. |
| 01:05 | Let's take a look at how a new command is created. |
| 01:10 | Let me zoom the program text to have a clear view. |
| 01:14 | Let's type a code in the editor to draw a square: |
| 01:19 | repeat 4 within curly brackets
{ forward 10 turnleft 90 } |
| 01:31 | Here the number 10 specfies the length of the side of the square. |
| 01:37 | Now let's learn the commands involved to draw a square, using the learn command. |
| 01:45 | We will name of this set of commands to draw a square as square. |
| 01:50 | The command 'learn' is followed by the name of the command to be learnt, in this case it is a square. |
| 01:59 | Let us type the following code |
| 02:02 | learn space square space $x |
| 02:10 | let's include curly brackets
|
| 02:13 | let's replace 10 by $x |
| 02:19 | New command that we have defined is called square. |
| 02:23 | square takes one input argument, $x to set the size of the square. |
| 02:31 | Note that when you run this code, square returns no output. |
| 02:37 | The command learn is just 'learning' other command square to be used later. |
| 02:43 | square command can now be used like a normal command in the rest of the code. |
| 02:51 | Let me add few more lines here. |
| 02:54 | Let's type
go 200,200 square 100 |
| 03:04 | Using the command square 100 Turtle draws a square of dimension 100. |
| 03:11 | Let's the Run code now |
| 03:13 | Turtle draws a square on the canvas. |
| 03:17 | Let's now replace 100 by 50. |
| 03:22 | Let's run again |
| 03:23 | Turtle draws another square with dimension 50. |
| 03:28 | Please note that this command can be used only within the scope of this program |
| 03:35 | I will clear the current code from editor. |
| 03:38 | Type “clear” command and Run to clean the canvas. |
| 03:44 | Next we will learn about “random” command. |
| 03:48 | random command takes input and returns output. |
| 03:52 | Syntax for the random command is “random X,Y” |
| 03:57 | where X and Y are two inputs. |
| 04:01 | X sets minimum output and Y sets maximum output. |
| 04:07 | Output is randomly chosen number between X and Y. |
| 04:13 | Let's put the “random” command to use in the application. |
| 04:18 | I already have acode in a text editor. |
| 04:22 | I will explain the code. |
| 04:24 | “reset” command sets Turtle to default position |
| 04:29 | Here, the command random 1,20 selects a random number which is equal or greater than 1 and equal or less than 20, and assigns it to the variable x. |
| 04:44 | repeat command and the commands within curly brackets draw a circle |
| 04:51 | I will copy the code from text editor and paste it into KTurtle's editor. |
| 04:58 | Pause the tutorial and type the program into your KTurtle editor. |
| 05:03 | Resume the tutorial after typing the program |
| 05:08 | When we run this code, |
| 05:10 | Turtle draws a circle with radius between 1 and 20 on the canvas. |
| 05:16 | Let us execute this code a few times, |
| 05:20 | You can see that a circle with a different size is generated each time. |
| 05:26 | Every time you execute this code, a circle with a different radius is drawn on the canvas. |
| 05:33 | Let us now use both the learn and random commands in an example. |
| 05:39 | I will clear the current code from the editor type clear command and Run to clean the canvas. |
| 05:48 | I already have a program in the Text editor. |
| 05:52 | I will explain the code now. |
| 05:55 | “reset” command sets Turtle to its default position. |
| 06:00 | canvassize 300,300 sets the width and height of the canvas to 300 pixels each. |
| 06:09 | $R, $G, and $B are three variables to which I am assigning random values between 0 and 255. |
| 06:19 | In the command canvascolor $R,$G, and $B , |
| 06:23 | the Red-Green-Blue combination is replaced by the values assigned to the variables R, G, and B in the previous step. |
| 06:34 | The canvas color is randomly set when this command is executed. |
| 06:41 | $red, $blue, $green are another set of variables |
| 06:45 | to which random values between 0 and 255 are assigned randomly. |
| 06:53 | pencolor $red, $blue and $green the Red-Blue -Green combination values are replaced by the variables |
| 07:02 | $red, $green and $blue to which random values were assigned
in the previous step. |
| 07:10 | The color of the pen is also set randomly when the command is executed. |
| 07:18 | penwidth 2 sets the width of pen to 2 pixels. |
| 07:25 | Next I have entered the code to learn to draw a circle. |
| 07:30 | Here $x represents the size of the circle. |
| 07:35 | repeat command followed by the code in curly brackets draws a circle. |
| 07:43 | The next set of commands that is go commands followed by circle commands draw circles with the specified sizes. |
| 07:54 | For example: circle with size 5 draws a circle with size 5 |
| 08:01 | At the co-ordinates specified at X and Y positions in the go command. |
| 08:09 | For each circle, I have specified different positions on the canvas. |
| 08:16 | I will copy the code from text editor and paste it into KTurtle's editor. |
| 08:23 | Pause the tutorial here and type the program into your KTurtle editor. |
| 08:29 | Resume the tutorial after typing the program. |
| 08:33 | I will execute this code in Fullspeed. |
| 08:37 | You can execute this code at any of the speeds specified in the Run option. |
| 08:43 | I will run this code a few times. |
| 08:46 | You can see the difference in randomly set values of pen color and canvas color. |
| 08:54 | Note the change in the color of the pen and the canvas on each execution. |
| 09:01 | You can execute the code how many ever times you want and note the changes in
the randomly set values of the pen and canvas. |
| 09:15 | With this we come to the end of this tutorial. |
| 09:20 | Let's summarize |
| 09:22 | In this tutorial we have learnt about,
|
| 09:30 | As an assignment for you to solve, |
| 09:32 | Using learn command, draw a
on all four corners of your canvas and |
| 09:45 | A circle at the centre of the canvas. |
| 09:49 | Using the “random” command create various colors and |
| 09:55 | Customize your geometric shapes and canvas. |
| 10:00 | Watch the video available at this URL http://spoken-tutorial.org/What is a Spoken Tutorial |
| 10:04 | It summarises the Spoken Tutorial project |
| 10:08 | If you do not have good bandwidth, you can download and watch it |
| 10:13 | The Spoken Tutorial Project Team : |
| 10:15 | Conducts workshops using spoken tutorials |
| 10:19 | Gives certificates to those who pass an online test |
| 10:22 | For more details, please write to contact@spoken-tutorial.org |
| 10:29 | Spoken Tutorial Project is a part of the Talk to a Teacher project |
| 10:33 | It is supported by the National Mission on Education through ICT, MHRD, Government of India |
| 10:40 | More information on this Mission is available at this link http://spoken-tutorial.org/NMEICT-Intro ] |
| 10:46 | This script is contributed by IT for change, Bangaluru. |
| 10:50 | This is Madhuri Ganpathi from IIT Bombay signing off. Thank you for joining. |
Contributors and Content Editors
Krupali, Madhurig, PoojaMoolya, Pratik kamble, Pravin1389, Sandhya.np14, Sneha
