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add angle argument to segs()

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Adrian Mariano
2025-08-22 23:59:50 -04:00
parent 7ec33d69d5
commit 64bb095204
1 changed files with 11 additions and 7 deletions
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14
utility.scad
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@@ -772,17 +772,21 @@ function scalar_vec3(v, dflt) =
// Topics: Geometry
// See Also: circle(), cyl()
// Usage:
// sides = segs(r);
// sides = segs(r, [angle]);
// Description:
// Calculate the standard number of sides OpenSCAD would give a circle based on `$fn`, `$fa`, and `$fs`.
// If angle is given, calculate for an arc of the given angle.
// Arguments:
// r = Radius of circle to get the number of segments for.
// r = Radius of circle/arc to get the number of segments for.
// angle = Angle of arc to get the get the number of segments for.
// Example:
// $fn=12; sides=segs(10); // Returns: 12
// $fa=2; $fs=3; sides=segs(10); // Returns: 21
function segs(r) =
$fn>0? ($fn>3? $fn : 3) :
let( r = is_finite(r)? r : 0 )
// $fa=2; $fs=3; sides=segs(10,180); // Returns: 11
function segs(r,angle) =
is_def(angle) ? ceil(segs(r)*abs(angle)/360-2e-15) // 2e-15 needed in case angle is slightly large due to rounding error
: $fn>0? ($fn>3? $fn : 3)
: let( r = is_finite(r)? r : 0 )
ceil(max(5, min(360/$fa, abs(r)*2*PI/$fs)));