Lecture 6 — Turtle Fill Colors & RGB⌗

Instructor: Laksh Budhrani

Review / Recap⌗

Commands You Already Know⌗

CommandMeaning (Simple)
p.forward(steps)Move the turtle straight ahead
p.backward(steps)Move the turtle straight backward
p.left(angle)Turn the turtle left
p.right(angle)Turn the turtle right
p.penup()Move without drawing
p.pendown()Start drawing again
p.pencolor(color)Change the pen color
p.pensize(size)Change the line thickness
p.hideturtle()Hide the turtle icon
p.showturtle()Show the turtle icon again
p.goto(x, y)Teleport the turtle to a coordinate
p.setheading(angle)Point the turtle in a specific direction
p.circle(r)Draw a full circle of radius r
p.circle(r, a)Draw an arc of angle a degrees
p.circle(r, a, s)Draw a polygon circle using s steps

Objectives⌗

  1. Learn how RGB colors work
  2. Learn how to use fillcolor()
  3. Learn how to use begin_fill() and end_fill()

Objective 1 — RGB Colors in Turtle⌗

Simple Definition⌗

  • RGB stands for Red, Green, Blue
  • Each value goes from 0 to 255
  • You can mix these three numbers to create any color

Syntax⌗

p.fillcolor( r, g, b )
p.pencolor( r, g, b )

Example:

p.fillcolor(0, 120, 255)   # bright blue
p.pencolor(255, 0, 0)      # red outline

RGB Venn Diagram⌗

RGB Venn Diagram

Objective 2 — fillcolor()⌗

Simple Definition⌗

  • fillcolor() — Set the color used to fill shapes.

Example⌗

p.fillcolor("purple")

Turtle Fill Color

Objective 3 — begin_fill() and end_fill()⌗

Simple Definition⌗

  • begin_fill() — Start filling the shape
  • end_fill() — Finish filling the shape

Example⌗

p.fillcolor("blue")
p.begin_fill()
p.forward(100)
p.left(90)
p.forward(100)
p.left(90)
p.forward(100)
p.left(90)
p.forward(100)
p.end_fill()

Turtle Filled Square

France Flag Activity (Guided)⌗

Create a new Python file in VS Code named:
turtle_class6.py

France Flag Image⌗

France Flag

Explain in Plain English⌗

Write a short explanation (3–5 sentences) describing how you think we can draw the France flag using:

  • fillcolor()
  • begin_fill()
  • end_fill()
  • goto()
  • setheading()
  • penup()
  • pendown()
  • forward()
  • left()

Explain the steps in simple English, as if you are telling a friend how to draw it.

Boilerplate Code⌗

import turtle as trtl

p = trtl.Turtle()
p.speed(0)

# --- ENTER YOUR CODE HERE ---
# (Use fillcolor, begin_fill, end_fill, and RGB if you want)



# --------------------------------------------------------------
# (Stop writing code above this line)

wn = trtl.Screen()
wn.mainloop()

Notes⌗

  • The France flag has three vertical rectangles
  • Use begin_fill() and end_fill() for each rectangle
  • Use goto() to move to each section
  • Use RGB or color names
  • Use hideturtle() at the end for a clean final look

Independent Activity — Traffic Light Drawing⌗

Traffic Light Image⌗

Traffic Light

Your Task⌗

Look at the image above and draw it independently using:

  • fillcolor()
  • begin_fill()
  • end_fill()
  • circle(r)
  • pensize()
  • goto(x, y)
  • penup()
  • pendown()
  • forward()
  • right()
  • hideturtle()

Use the Turtle boilerplate code provided earlier in this lecture.

Create Your Own File⌗

Create a new Python file in VS Code named:

turtle_class6_independent.py

Inside that file, use the boilerplate and write your traffic‑light code in the section marked:

# --- ENTER YOUR CODE HERE ---

Submission Instructions⌗

Submit your work in Google Classroom by:

  1. Creating a Google Doc
  2. Pasting your code into the document
  3. Adding a screenshot of the output window showing your drawing
  4. Turn in the Google Doc to the assignment titled In‑Class Exercise 6