With vector graphics lines and shapes can be drawn to any scale without losing quality because unlike photographs, the mathematics to draw the image is stored instead of the individual-coloured pixels. Vectors are also great for sending instructions to hardware such as laser cutters and embroidery machines.

Letter F

Try

Note, in Trinket, the turtle library is only supported in Python v2, so there is no support for the match/case command.

Watch this video to learn about the new concepts shown in the program:

Knowledge organiser

The new commands used in this program and others that may be useful. Select them below to learn more:

turtle.left(x)

Turns the turtle left x degrees. Turns are always made from the perspective of the turtle, not the programmer, so if the turtle is facing down, left will be right and right will be left!

turtle.right(x)

Turns the turtle right x degrees. Turns are always made from the perspective of the turtle, not the programmer, so if the turtle is facing down, left will be right and right will be left!

turtle.forward(x)

Moves the turtle forward x pixels. If the pen is down (default) a line will be drawn from the start position to the end position. If the pen is up a line will not be drawn.

turtle.back(x)

Moves the turtle backwards pixels without turning around. If the pen is down (default) a line will be drawn from the start position to the end position. If the pen is up a line will not be drawn.

turtle.pensize(x)

Sets the pen to be x pixels wide. The default is 1. Larger numbers result in thicker lines being drawn.

turtle.done()

Ends the turtle program. This is not necessary, but some implementations of turtle require this to prevent the graphics canvas window being closed automatically when the program ends. It is good practice to include this command at the end of programs using turtle.

Investigate

Questions to think about with this program to check your understanding:

Item question

Identify an argument in the program.

Reveal answer

“C” is an argument in the command:

draw_letter("C")

Arguments are the data that is passed into subprograms where they become known as parameters.

Structure question

If a turtle is facing downwards, which direction would it be facing after the command turtle.left(90)?

Reveal answer

Turns are always seen from the perspective of the turtle. If the turtle is facing downwards, turning left(90) would make it face right.

Make

Change the program below so that it:

  1. Includes another subprogram to output the letter “F”.

Sample output from the program

Restricted automated feedback

Automated feedback for this assignment is still under construction. Submitted programs are checked for syntax errors and their source code is checked for potential errors, bugs, stylistic issues, and suspicious constructs. However, no checks are performed yet to see if the program correctly implements the behaviour specified in the assignment.