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refactored

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Justin Lin
2017-05-21 20:44:15 +08:00
parent bd310066d8
commit fb0df2cb77
1 changed files with 7 additions and 11 deletions
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18
src/arc.scad
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@@ -13,6 +13,7 @@
**/
include <__private__/__frags.scad>;
include <__private__/__ra_to_xy.scad>;
module arc(radius, angles, width, width_mode = "LINE_CROSS") {
@@ -28,8 +29,6 @@ module arc(radius, angles, width, width_mode = "LINE_CROSS") {
m = floor(angles[0] / a_step) + 1;
n = floor(angles[1] / a_step);
function unit_xy(a) = [cos(a), sin(a)];
function edge_r_begin(orig_r, a) =
let(leng = orig_r * cos(half_a_step))
leng / cos(m * a_step - half_a_step - a);
@@ -43,21 +42,18 @@ module arc(radius, angles, width, width_mode = "LINE_CROSS") {
points = concat(
// outer arc path
[edge_r_begin(r_outer, angles[0]) * unit_xy(angles[0])],
[
for(i = [m:n])
r_outer * unit_xy(a_step * i)
],
[edge_r_end(r_outer, angles[1]) * unit_xy(angles[1])],
[__ra_to_xy(edge_r_begin(r_outer, angles[0]), angles[0])],
[for(i = [m:n]) __ra_to_xy(r_out, a_step * i)],
[__ra_to_xy(edge_r_end(r_outer, angles[1]), angles[1])],
// inner arc path
[edge_r_end(r_inner, angles[1]) * unit_xy(angles[1])],
[__ra_to_xy(edge_r_end(r_inner, angles[1]), angles[1])],
[
for(i = [m:n])
let(idx = (n + (m - i)))
r_inner * unit_xy(a_step * idx)
__ra_to_xy(r_inner, a_step * idx)
],
[edge_r_begin(r_inner, angles[0]) * unit_xy(angles[0])]
[__ra_to_xy(edge_r_begin(r_inner, angles[0]), angles[0])]
);
polygon(points);