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rewrote to use polygon

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Justin Lin
2017-05-07 17:43:12 +08:00
parent 5a172bb9a7
commit 8f6baf623a
1 changed files with 22 additions and 10 deletions
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30
src/circular_sector.scad
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@@ -13,20 +13,32 @@
include <__private__/__frags.scad>; include <__private__/__frags.scad>;
module circular_sector(radius, angles) { module circular_sector(radius, angles) {
function unit_xy(a) = [cos(a), sin(a)];
frags = __frags(radius); frags = __frags(radius);
r = radius / cos(180 / frags); a_step = 360 / frags;
step = -360 / frags;
points = concat([[0, 0]], m = floor(angles[0] / a_step) + 1;
[for(a = [angles[0] : step : angles[1] - 360]) n = floor(angles[1] / a_step);
[r * cos(a), r * sin(a)]
half_a_step = a_step / 2;
leng = radius * cos(half_a_step);
function edge_r_begin(a) =
leng / cos(m * a_step - half_a_step - a);
function edge_r_end(a) =
leng / cos((n + 0.5) * a_step - a);
points = concat(
[[0, 0], edge_r_begin(angles[0]) * unit_xy(angles[0])],
[
for(i = [m:n])
radius * unit_xy(a_step * i)
], ],
[[r * cos(angles[1]), r * sin(angles[1])]] [edge_r_end(angles[1]) * unit_xy(angles[1])]
); );
difference() {
circle(radius);
polygon(points); polygon(points);
} }
}