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56 lines
1.0 KiB
Markdown
56 lines
1.0 KiB
Markdown
# footprints2
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Drive a turtle with `["forward", length]` or `["turn", angle]`. This function is intended to use a turtle to imitate freehand drawing.
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**Since:** 2.4
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## Parameters
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- `cmds` : A list of `["forward", length]`s and `["turn", angle]`s.
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- `start` : Set the start point of the turtle. Default to `[0, 0]`.
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## Examples
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use <polyline_join.scad>;
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use <turtle/footprints2.scad>;
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function arc_cmds(radius, angle, steps) =
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let(
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fa = angle / steps,
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ta = fa / 2,
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leng = sin(ta) * radius * 2
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)
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concat(
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[["turn", ta]],
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[
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for(i = [0:steps - 2])
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each [["forward", leng], ["turn", fa]]
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],
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[["forward", leng], ["turn", ta]]
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);
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poly = footprints2(
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concat(
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[
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["forward", 10],
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["turn", 90],
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["forward", 10]
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],
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arc_cmds(5, 180, 12),
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[
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["turn", -90],
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["forward", 10],
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["turn", 90],
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["forward", 10],
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["turn", 90],
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["forward", 10]
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]
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)
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);
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polyline_join(poly)
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circle(.5);
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