Parses axioms and rules and runs a simulation with the given parameters. Use the Preset selector in the bottom for some pre-filled shapes.

Axiom: initial statement to start the expansion from.

Rules: sequence of newline-separated replacement rules.

Initial angle: starting direction the drawing pen is pointing in, in degrees. This simulation uses canvas coordinates (y grows downward); to start pointing up, the initial angle should be set at 180.

Angle change: degrees for each turn command.

Scale multiplier: length multiplier for each recursive step.

Simulation depth: how many recursion steps to perform.