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Code Issues Releases Wiki Activity

added cross_sections.scad

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Justin Lin
2017-05-04 09:58:40 +08:00
parent 2d9ad30d37
commit 3176cfb122
1 changed files with 36 additions and 0 deletions
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src/cross_sections.scad Normal file
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/**
* cross_sections.scad
*
* Given a starting cross-section, points and angles along the path, this function
* will return all cross-sections.
*
* @copyright Justin Lin, 2017
* @license https://opensource.org/licenses/lgpl-3.0.html
*
* @see https://openhome.cc/eGossip/OpenSCAD/lib-cross_sections.html
*
**/
function cross_sections(shape_pts, path_pts, angles, twist = 0, scale = 1.0) =
let(
len_path_pts_minus_one = len(path_pts) - 1,
sh_pts = len(shape_pts[0]) == 3 ? shape_pts : [for(p = shape_pts) [p[0], p[1], 0]],
pth_pts = len(path_pts[0]) == 3 ? path_pts : [for(p = path_pts) [p[0], p[1], 0]],
scale_step_vt = len(scale) == 2 ?
[(scale[0] - 1) / len_path_pts_minus_one, (scale[1] - 1) / len_path_pts_minus_one] :
[(scale - 1) / len_path_pts_minus_one, (scale - 1) / len_path_pts_minus_one],
scale_step_x = scale_step_vt[0],
scale_step_y = scale_step_vt[1],
twist_step = twist / len_path_pts_minus_one
)
[
for(i = [0:len_path_pts_minus_one])
[
for(p = sh_pts)
let(scaled_p = [p[0] * (1 + scale_step_x * i), p[1] * (1 + scale_step_y * i), p[2]])
rotate_p(
rotate_p(scaled_p, twist_step * i)
, angles[i]
) + pth_pts[i]
]
];