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Merge branch 'open_belt' of https://github.com/SmoothieAq/NopSCADlib into SmoothieAq-open_belt

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Chris Palmer
2021-03-14 14:39:05 +00:00
parent 83b4ab2374 d2c795f5f5
commit 42e03679b4
1 changed files with 9 additions and 7 deletions
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16
utils/rounded_polygon.scad
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@@ -24,6 +24,7 @@
//! Because the tangents need to be calculated to find the length these can be calculated separately and re-used when drawing to save calculating them twice.
//
include <../utils/core/core.scad>
use <../utils/maths.scad>
function circle_tangent(p1, p2) = //! Compute the clockwise tangent between two circles represented as [x,y,r]
let(
@@ -41,19 +42,20 @@ function rounded_polygon_arcs(points, tangents) = //! Compute the arcs at the po
len = len(points)
) [ for (i = [0: len-1])
let(
p1 = tangents[(i - 1 + len) % len][1],
p2 = tangents[i][0],
p = points[i],
p1 = vec2(tangents[(i - 1 + len) % len][1]),
p2 = vec2(tangents[i][0]),
p = vec2(points[i]),
v1 = p1 - p,
v2 = p2 - p,
r = abs(p.z),
a = let( aa = acos((v1 * v2) / sqr(r)) ) cross(v1, v2)*sign(p.z) <= 0 ? aa : 360 - aa,
sr = points[i][2],
r = abs(sr),
a = r < 0.001 ? 0 : let( aa = acos((v1 * v2) / sqr(r)) ) cross(v1, v2)*sign(sr) <= 0 ? aa : 360 - aa,
l = PI * a * r / 180,
v0 = [r, 0],
v = let (
vv = norm(v0-v2) < 0.001 ? 0 : abs(v2.y) < 0.001 ? 180 :
let( aa = acos((v0 * v2) / sqr(r)) ) cross(v0, v2)*sign(p.z) <= 0 ? aa : 360 - aa
) p.z > 0 ? 360 - vv : vv - a
let( aa = acos((v0 * v2) / sqr(r)) ) cross(v0, v2)*sign(sr) <= 0 ? aa : 360 - aa
) sr > 0 ? 360 - vv : vv - a
) [a, v, l]
];