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dotSCAD/docs/lib-torus_knot.md
Justin Lin 49398206de update doc
2019-06-07 10:42:56 +08:00

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# torus_knot
Generate a path of [The (p,q)-torus knot](https://en.wikipedia.org/wiki/Torus_knot).
**Since:** 1.2.
![torus_knot](images/lib-torus_knot-1.JPG)
## Parameters
- `p` : The p parameter of The (p,q)-torus knot.
- `q` : The q parameter of The (p,q)-torus knot.
- `phi_step` : The amount when increasing phi.
## Examples
include <shape_pentagram.scad>;
include <rotate_p.scad>;
include <polysections.scad>;
include <path_extrude.scad>;
include <torus_knot.scad>;
p = 2;
q = 3;
phi_step = 0.05;
star_radius = 0.5;
pts = torus_knot(p, q, phi_step);
shape_pentagram_pts = shape_pentagram(star_radius);
path_extrude(
shape_pentagram_pts,
concat(pts, [pts[0]]),
closed = true,
method = "EULER_ANGLE"
);
![torus_knot](images/lib-torus_knot-2.JPG)