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Merge pull request #1435 from adrianVmariano/master

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arc endpoint bugfix
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Revar Desmera 2024-05-23 14:07:52 -07:00 committed by GitHub
commit 334498d8f9
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1 changed files with 17 additions and 5 deletions
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drawing.scad
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@ -771,10 +771,12 @@ function arc(n, r, angle, d, cp, points, corner, width, thickness, start, wedge=
assert(is_def(r) && r>0, "Arc radius invalid")
let(
n = is_def(n) ? n : max(3, ceil(segs(r)*abs(angle)/360)),
arcpoints = [for(i=[0:n-1]) let(theta = start + i*angle/(n-1)) r*[cos(theta),sin(theta)]+cp],
extra = wedge? [cp] : []
arcpoints = [for(i=[0:n-1]) let(theta = start + i*angle/(n-1)) r*[cos(theta),sin(theta)]+cp]
)
concat(extra,arcpoints)
[
if (wedge) cp,
each arcpoints
]
: is_def(corner)?
assert(is_path(corner,[2,3]) && len(corner)==3,str("Point list is invalid"))
assert(is_undef(cp) && !any([long,cw,ccw]), "Cannot use cp, long, cw, or ccw with corner")
@ -849,9 +851,19 @@ function arc(n, r, angle, d, cp, points, corner, width, thickness, start, wedge=
theta_start = atan2(points[0].y-cp.y, points[0].x-cp.x),
theta_end = atan2(points[1].y-cp.y, points[1].x-cp.x),
angle = posmod(theta_end-theta_start, 360),
arcpts = arc(n,cp=cp,r=r,start=theta_start,angle=angle,wedge=wedge)
// Specify endpoints exactly; skip those endpoints when producing arc points
// Generating the whole arc and clipping ends is the easiest way to ensure that we
// generate the proper number of points.
arcpts = [ if (wedge) cp,
points[0],
each select(arc(n,cp=cp,r=r,start=theta_start,angle=angle),1,-2),
points[1]
]
)
dir ? arcpts : wedge?reverse_polygon(arcpts):reverse(arcpts);
dir ? arcpts
: wedge ? reverse_polygon(arcpts) // Keep the centerpoint at position 0 in the list
: reverse(arcpts);
module arc(n, r, angle, d, cp, points, corner, width, thickness, start, wedge=false, anchor=CENTER, spin=0)