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Creates a turtle at the origin, heading east: turtle() for a fresh default-sized diagram, turtle(w, h) for a fresh sized one, or turtle(d) to draw into an existing diagram.
w (number) -- optional pixel width (fresh diagram only)h (number) -- optional pixel height (fresh diagram only)Moves the turtle forward along its current heading, drawing a segment if the pen is down.
t (turtle) -- dist (number) -- Moves the turtle backward along its current heading, drawing a segment if the pen is down.
t (turtle) -- dist (number) -- Turns the turtle counterclockwise by an angle in degrees.
t (turtle) -- degrees (number) -- Turns the turtle clockwise by an angle in degrees.
t (turtle) -- degrees (number) -- Lifts the turtle's pen -- subsequent moves reposition it without drawing.
t (turtle) -- Lowers the turtle's pen -- subsequent moves draw again.
t (turtle) -- Jumps the turtle directly to (x, y), drawing a segment from its current position if the pen is down.
t (turtle) -- x (number) -- y (number) -- Sets the turtle's heading directly, in degrees (0 = east, increasing = counterclockwise).
t (turtle) -- degrees (number) -- Returns the turtle to the origin with heading reset to 0, drawing a segment there if the pen is down.
t (turtle) -- Sets the turtle's pen colour for future segments: any CSS colour (a name such as "crimson", "#rrggbb", rgb(...), hsl(...)) or a colour value from rgb()/hsl()/mix().
t (turtle) -- color (string) -- The turtle's current heading, in degrees.
t (turtle) -- The turtle's current position, as a point2d.
t (turtle) -- Sweeps the turtle along a true circular arc tangent to its current heading: positive angle curves left, negative curves right.
t (turtle) -- radius (number) -- angleDegrees (number) -- Draws a cubic Bezier curve from the turtle's current position, with control points and endpoint given as local (forward/left) offsets. The turtle exits along the curve's tangent direction.
t (turtle) -- c1dx (number) -- c1dy (number) -- c2dx (number) -- c2dy (number) -- edx (number) -- edy (number) -- Pushes the turtle's position, heading, and pen state onto a stack -- pair with popState() to branch (e.g. drawing a fractal tree) and return.
t (turtle) -- Restores the turtle's position, heading, and pen state from the top of the stack pushState() built. Already-drawn shapes are unaffected.
t (turtle) -- Sets the width of the turtle's lines from now on (2 by default).
t (turtle) -- w (number) -- Sets the colour endFill() fills with (the pen colour until set).
t (turtle) -- color (colour) -- Starts recording a shape to fill: every point the turtle passes until endFill(), pen up or down, arcs and curves included.
t (turtle) -- Fills the shape traced since beginFill(), under the lines drawn meanwhile.
t (turtle) --