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refactored

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Justin Lin 2017-05-25 09:40:51 +08:00
parent 2335ee8268
commit 8e6ba3089e
1 changed files with 2 additions and 43 deletions
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45
src/arc.scad
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@ -15,49 +15,8 @@
include <__private__/__frags.scad>;
include <__private__/__is_vector.scad>;
include <__private__/__ra_to_xy.scad>;
include <__private__/__shape_arc.scad>;
module arc(radius, angle, width, width_mode = "LINE_CROSS") {
w_offset = width_mode == "LINE_CROSS" ? [width / 2, -width / 2] : (
width_mode == "LINE_INWARD" ? [0, -width] : [width, 0]
);
frags = __frags(radius);
a_step = 360 / frags;
half_a_step = a_step / 2;
angles = __is_vector(angle) ? angle : [0, angle];
m = floor(angles[0] / a_step) + 1;
n = floor(angles[1] / a_step);
function edge_r_begin(orig_r, a) =
let(leng = orig_r * cos(half_a_step))
leng / cos(m * a_step - half_a_step - a);
function edge_r_end(orig_r, a) =
let(leng = orig_r * cos(half_a_step))
leng / cos((n + 0.5) * a_step - a);
r_outer = radius + w_offset[0];
r_inner = radius + w_offset[1];
points = concat(
// outer arc path
[__ra_to_xy(edge_r_begin(r_outer, angles[0]), angles[0])],
m > n ? [] : [for(i = [m:n]) __ra_to_xy(r_outer, a_step * i)],
angles[1] == a_step * n ? [] : [__ra_to_xy(edge_r_end(r_outer, angles[1]), angles[1])],
// inner arc path
angles[1] == a_step * n ? [] : [__ra_to_xy(edge_r_end(r_inner, angles[1]), angles[1])],
m > n ? [] : [
for(i = [m:n])
let(idx = (n + (m - i)))
__ra_to_xy(r_inner, a_step * idx)
],
[__ra_to_xy(edge_r_begin(r_inner, angles[0]), angles[0])]
);
polygon(points);
polygon(__shape_arc(radius, angle, width, width_mode));
}