dotSCAD/docs/lib3x-footprints2.md

footprints2

Drive a turtle with ["forward", length] or ["turn", angle]. This function is intended to use a turtle to imitate freehand drawing.

Since: 2.4

Parameters

• cmds : A list of ["forward", length]s and ["turn", angle]s.
• start : Set the start point of the turtle. Default to [0, 0].

Examples

use <polyline2d.scad>;
use <turtle/footprints2.scad>;

function arc_cmds(radius, angle, steps) = 
	let(
		fa = angle / steps,
		ta = fa / 2,
		leng = sin(ta) * radius * 2
	)
	concat(
		[["turn", ta]],
		[
			for(i = [0:steps - 2])
			each [["forward", leng], ["turn", fa]]
		],
		[["forward", leng], ["turn", ta]]
	);
	
poly = footprints2(
	concat(
		[
			["forward", 10],
			["turn", 90],
			["forward", 10] 
		], 
		arc_cmds(5, 180, 12),
		[
			["turn", -90],
			["forward", 10],
			["turn", 90],
			["forward", 10],
			["turn", 90],
			["forward", 10]
		]
	)
);

polyline2d(poly, width = 1);