How to Draw Shapes with the Pen

This tutorial will teach how to draw shapes with the pen.

Square

Use this custom block to draw a square where the top-left corner will be the sprite's current position and the top side will be pointed sprite's current direction:

define square (size::custom)
pen down
repeat (4)
move (size::custom) steps
turn cw (90) degrees
end

To have a square that is not rotated, still using the sprite's current position as the top left corner, use the following script instead:

define square (size::custom)
pen down
change x by (size::custom)
change y by (join [-] (size::custom))
change x by (join [-] (size::custom))
change y by (size::custom)

The sprite will now draw a square when the block is run.

Rectangle

The following script will draw a rectangle, with the current sprite's position as the top left corner and rotated in the current sprite's direction:

define rectangle height (height) width (width)
pen down
repeat (2)
move (width) steps
turn cw (90) degrees
move (height) steps
turn cw (90) degrees
end

Circle

This script will draw a circle:

define circle (size::custom)
pen down
repeat (round ((360)/(size::custom)))
move (size::custom) steps
turn cw (size::custom) degrees
end

Any Regular Polygon

A more advanced, but more versatile method draws any regular polygon:

define polygon sides (sides) radius (radius)
set (interior angle) to ((180)-((((sides)-(2))*(180))/(sides))
change y by (radius)
point in direction (((180)-(interior angle))/(2))
pen down
repeat (sides)
turn cw (interior angle) degrees
move ((2)*((radius)*([sin v] of ((180)/(sides))))) steps
end

The "sides" input controls how many sides the polygon has, and the "radius" controls the distance from the center of the polygon to any vertex (corner) of the polygon.