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supported vector

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Justin Lin
2017-05-22 09:54:01 +08:00
parent b7163971e3
commit 043af1b9f6
1 changed files with 28 additions and 8 deletions
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36
src/ring_extrude.scad
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@@ -17,21 +17,41 @@ include <__private__/__ra_to_xy.scad>;
module ring_extrude(shape_pts, radius, angle = 360, twist = 0, scale = 1.0, triangles = "SOLID") {
a_step = 360 / __frags(radius);
n = floor(angle / a_step);
angles = __is_vector(angle) ? angle : [0, angle];
m = floor(angles[0] / a_step) + 1;
n = floor(angles[1] / a_step);
leng = radius * cos(a_step / 2);
function begin_r() =
leng / cos((m - 0.5) * a_step - angles[0]);
function end_r() =
radius * cos(a_step / 2) / cos((n + 0.5) * a_step - angle);
leng / cos((n + 0.5) * a_step - angles[1]);
angs = [for(a = [0:a_step:n * a_step]) [90, 0, a]];
pts = [for(a = angs) __ra_to_xy(radius, a[2])];
angs = concat(
[[90, 0, angles[0]]],
[for(i = [m:n]) [90, 0, a_step * i]]
);
pts = concat(
[__ra_to_xy(begin_r(), angles[0])],
[for(i = [m:n]) __ra_to_xy(radius, a_step * i)]
);
is_angle_frag_end = angs[len(angs) - 1][2] == angle;
is_angle_frag_end = angs[len(angs) - 1][2] == angles[1];
angles = is_angle_frag_end ? angs : concat(angs, [[90, 0, angle]]);
points = is_angle_frag_end ? pts : concat(pts, [__ra_to_xy(end_r(), angle)]);
all_angles = is_angle_frag_end ?
angs :
concat(angs, [[90, 0, angles[1]]]);
all_points = is_angle_frag_end ?
pts :
concat(pts, [__ra_to_xy(end_r(), angles[1])]);
polysections(
cross_sections(shape_pts, points, angles, twist, scale),
cross_sections(shape_pts, all_points, all_angles, twist, scale),
triangles = triangles
);
}