Core turtle data type. A turtle needs to keep track of its current position, like its position, heading etc., and all the paths that it has traversed so far.

We need to record a new path, everytime an attribute like style, pen position etc changes, so that we can separately track styles for each portion of the eventual path that the turtle took.

Turtle path type that captures a list of paths and the style attributes associated with them

Style attributes associated with the turtle pen

Move the turtle forward by x units

Move the turtle backward by x units

Turn the turtle anti-clockwise (left)

Turn the turtle clockwise (right)

alias of setPenColour

Set a new pen color for turtle.

If pen is down, this adds the current trail to paths and starts a new empty trail.

Set a new pen width for turtle.

If pen is down, this adds the current trail to paths and starts a new empty trail.

The initial state of turtle. The turtle is located at the origin, at an orientation of 0 degrees with its pen position down. The pen style is defaultPenStyle.

Turn the turtle to the given orientation, in degrees

Sets the turtle orientation towards a given location.

Set the turtle X/Y position.

If pen is down and the current trail is non-empty, this will also add the current trail to the paths field.

Puts the turtle pen in “Up” mode. Turtle movements will not draw anything

Does nothing if the pen was already up. Otherwise, it creates a turtle with the current trail added to paths.

Puts the turtle pen in “Down” mode. Turtle movements will cause drawing to happen

Does nothing if the pen was already down. Otherwise, starts a new trail starting at the current position.

Prints out turtle representation and returns it. Use for debugging

Creates a diagram from a turtle

Applies the styles to each trails in paths separately and combines them into a single diagram

Creates a path from a turtle, ignoring the styles.