Learning goals

Fill a shape with color.

Choose a fill color and a background color.

Explain when the turtle fills a shape.

You can give a shape a color on the inside. This is called filling. Tell the turtle where the filling starts with begin_fill() and where it stops with end_fill(). Draw your shape in between. The turtle fills it when you call end_fill().

otto.begin_fill()
otto.circle(50)
otto.end_fill()

A black circle, filled in when the turtle is done

The inside gets the same color as the line, unless you choose another color with fillcolor(). Do this before begin_fill().

otto.color("red")
otto.fillcolor("yellow")
otto.begin_fill()
otto.circle(50)
otto.end_fill()

This draws a circle with a red line and a yellow inside.

A circle with a red line and a yellow inside

You can change the color of the background with bgcolor(). Use "blue" and a yellow circle, and you get a sun in the sky.

otto.bgcolor("blue")
otto.color("yellow")
otto.begin_fill()
otto.circle(50)
otto.end_fill()

A yellow circle on a blue background

Summary

Command	What it does
`begin_fill()`	Starts a shape that will be filled.
`end_fill()`	Ends the shape and fills the inside with color.
`fillcolor(color)`	Sets the `color` for the inside, for example `"yellow"`.
`bgcolor(color)`	Sets the color of the background, for example `"blue"`.