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path_extrude_fn: extrude a variable shape over a path #39

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path_extrude_fn: extrude a variable shape over a path #39

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25 changes: 17 additions & 8 deletions src/path_extrude.scad
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,16 @@ use <matrix/m_translation.scad>
use <matrix/m_rotation.scad>

module path_extrude(shape_pts, path_pts, triangles = "SOLID", twist = 0, scale = 1.0, closed = false, method = "AXIS_ANGLE") {
sh_pts = len(shape_pts[0]) == 3 ? [for(p = shape_pts) [each p, 1]] : [for(p = shape_pts) [p.x, p.y, 0, 1]];
shape_pts_fn = function(t) shape_pts;
path_extrude_fn(shape_pts_fn, path_pts, triangles, twist, scale, closed, method);
}

module path_extrude_fn(shape_pts_fn, path_pts, triangles = "SOLID", twist = 0, scale = 1.0, closed = false, method = "AXIS_ANGLE") {
sh_pts_fn = function(t)
let(shape_pts = shape_pts_fn(t))
len(shape_pts[0]) == 3
? [for(p = shape_pts) [each p, 1]]
: [for(p = shape_pts) [p.x, p.y, 0, 1]];
pth_pts = len(path_pts[0]) == 3 ? path_pts : [for(p = path_pts) __to3d(p)];

len_path_pts = len(pth_pts);
Expand Down Expand Up @@ -70,10 +79,10 @@ module path_extrude(shape_pts, path_pts, triangles = "SOLID", twist = 0, scale =

// get all sections
angleyz_pts01 = __angy_angz(pth_pts[0], pth_pts[1]);
function init_section(a, s) =
function init_section(a, s, t) =
let(transform_m = m_rotation([0, -angleyz_pts01[0], angleyz_pts01[1]]) * m_rot_90_0_n90 * m_rotation(a) * m_scaling(s))
[
for(p = sh_pts)
for(p = sh_pts_fn(t))
let(transformed = transform_m * p)
[transformed.x, transformed.y, transformed.z]
];
Expand All @@ -89,14 +98,14 @@ module path_extrude(shape_pts, path_pts, triangles = "SOLID", twist = 0, scale =
ms2p = [ms2[0], ms2[1], ms2[2]]
)
[
for(p = init_section(init_a, init_s))
for(p = init_section(init_a, init_s, (j+1) / len_path_pts_minus_one))
[ms0p * p, ms1p * p, ms2p * p]
];

sections =
let(
fst_section = translate_pts(init_section(0, one), pth_pts[0]),
snd_section = translate_pts(init_section(0, one + scale_step_vt), pth_pts[1]),
fst_section = translate_pts(init_section(0, one, 0), pth_pts[0]),
snd_section = translate_pts(init_section(0, one + scale_step_vt, 1 / len_path_pts_minus_one), pth_pts[1]),
end_i = closed ? len_path_pts - 2 : len_path_pts - 1,
remain_sections = [
for(i = 1; i < end_i; i = i + 1)
Expand Down Expand Up @@ -139,7 +148,7 @@ module path_extrude(shape_pts, path_pts, triangles = "SOLID", twist = 0, scale =
m_scaling([1 + scale_step_vt.x * i, 1 + scale_step_vt.y * i, 1])
)
[
for(p = sh_pts)
for(p = sh_pts_fn(i / len_path_pts_minus_one))
let(transformed = transform_m * p)
[transformed.x, transformed.y, transformed.z]
];
Expand Down Expand Up @@ -174,4 +183,4 @@ module path_extrude(shape_pts, path_pts, triangles = "SOLID", twist = 0, scale =
// override to test
module test_path_extrude(sections, method) {

}
}