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provided supports for $fa, $fs, $fn

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Justin Lin
2017-03-23 09:33:23 +08:00
parent 240a05d64b
commit f0a4e4436e
1 changed files with 12 additions and 5 deletions
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17
src/circular_sector.scad
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@@ -1,7 +1,7 @@
/**
* circular_sector.scad
*
* Create a circular sector. You can pass a 2 element vector to define the central angle. It provides a fn parameter consistent with the $fn parameter of the circle module.
* Create a circular sector. You can pass a 2 element vector to define the central angle. Its $fa, $fs and $fn parameters are consistent with the circle module.
*
* @copyright Justin Lin, 2017
* @license https://opensource.org/licenses/lgpl-3.0.html
@@ -11,9 +11,16 @@
**/
module circular_sector(radius, angles, fn = 24) {
r = radius / cos(180 / fn);
step = -360 / fn;
module circular_sector(radius, angles) {
frags = $fn > 0 ?
($fn >= 3 ? $fn : 3) :
max(min(360 / $fa, radius * 2 * 3.14159 / $fs), 5)
;
echo(frags);
r = radius / cos(180 / frags);
step = -360 / frags;
points = concat([[0, 0]],
[for(a = [angles[0] : step : angles[1] - 360])
@@ -23,7 +30,7 @@ module circular_sector(radius, angles, fn = 24) {
);
difference() {
circle(radius, $fn = fn);
circle(radius);
polygon(points);
}
}