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Soal Tutorial

First, let's experiment!

The first thing you should do is try out some of the turtle commands by just typing them in the IDLE window. You can get a much better feel for how the whole thing works by just trying it.

  1. Type the following program using the IDLE editor and save it in a file: turtleSample01.py

[WARNING: Do not save it in a file named turtle.py]

## turtleSample01.py
## using turtle to draw a triangle
import turtle

# let's start up a Turtle Graphics window with a red turtle
turtle.color('red')

# put it down so all movement will show as a red line
turtle.pendown()

# move forward by 100 in current direction
turtle.forward(100)

# rotate direction of turtle by 120 degrees
turtle.right(120)

# move forward by 100 in current direction
turtle.forward(100)

# rotate direction of turtle by 120 degrees
turtle.right(120)

# move forward by 100 in current direction
turtle.forward(100)

# make the turtle invisible
turtle.hideturtle()

# wait for user to click on the screen to exit
turtle.exitonclick()

  1. Run the program to see what it does.

  2. Modify the program to draw a green hexagon (regular polygon with 6 sides). You have to calculate first the suitable turning angle, using the formula discussed below.

    Here is some useful information about regular polygon.

    Regular Polygon

    The formula for total degress of all angles on the inside of a regular polygon with n sides is 180*(n-2) so each interior angle is 180*(n-2)/n. From that you can calculate how much to turn (exterior angle): 180-180*(n-2)/n = 360/n

  3. Modify the previous program to draw a blue regular polygon according to user's input:

    1. Prompt the user to input the number of sides and store the string in a variable. Then convert the string to an integer and store it in a new variable.
    2. Prompt the user to input the length of each side and store the string in a variable. Then convert the string to an integer and store it in a new variable.
    3. Using for loop, draw a blue regular polygon of given number of sides. Each side of the polygon has a length as determined by the user's input.

That's all for today. Happy programming! 'Met ngoding!

L. Y. Stefanus

Taken from lab01_ddp2017.pdf (Tutorial Lab 1 DDP1 F -- 30 August 2017)