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add attachments to region()

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rewrite "circle" attachment to use line intersection
This commit is contained in:
Adrian Mariano
2021-11-13 10:47:51 -05:00
parent f605bafb0d
commit b671a0c37d
3 changed files with 27 additions and 15 deletions
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23
attachments.scad
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@@ -1522,7 +1522,7 @@ function _get_cp(geom) =
)
assert(type!="other", "Invalid cp value")
cp=="centroid" ? centroid(geom[1])
: let(points = type=="vnf"?geom[1][0]:geom[1])
: let(points = type=="vnf"?geom[1][0]:flatten(force_region(geom[1])))
cp=="mean" ? mean(points)
: cp=="box" ? mean(pointlist_bounds(points))
: assert(false,"Invalid cp specification");
@@ -1703,13 +1703,18 @@ function _find_anchor(anchor, geom) =
) [anchor, pos, vec, 0]
) : type == "circle"? ( //r
assert(anchor.z==0, "The Z component of an anchor for a 2D shape must be 0.")
let(
let(
rr = geom[1],
r = is_num(rr)? [rr,rr] : point2d(rr),
pos = approx(anchor.x,0) ? [sign(anchor.x)*r.x,0]
: let(
m = anchor.y/anchor.x,
px = sign(anchor.x) * sqrt(1/(1/sqr(r.x) + m*m/sqr(r.y)))
)
[px,m*px],
anchor = unit(point2d(anchor),[0,0]),
pos = point2d(cp) + v_mul(r,anchor) + point2d(offset),
vec = unit(v_mul(r,anchor),[0,1])
) [anchor, pos, vec, 0]
vec = [r.y/r.x*pos.x, r.x/r.y*pos.y]
) [anchor, point2d(cp+offset)+pos, vec, 0]
) : type == "rgn_isect"? ( //region
assert(anchor.z==0, "The Z component of an anchor for a 2D shape must be 0.")
let(
@@ -1727,7 +1732,10 @@ function _find_anchor(anchor, geom) =
n2 = vector_angle(anchor,n)>90? -n : n
)
if(!is_undef(isect) && !approx(isect,t[0])) [norm(isect), isect, n2]
],
]
)
assert(len(isects)>0, "Anchor vector does not intersect with the shape. Attachment failed.")
let(
maxidx = max_index(column(isects,0)),
isect = isects[maxidx],
pos = point2d(cp) + isect[1],
@@ -1736,8 +1744,7 @@ function _find_anchor(anchor, geom) =
) : type == "rgn_extent"? ( //region
assert(anchor.z==0, "The Z component of an anchor for a 2D shape must be 0.")
let(
rgn_raw = geom[1],
rgn = is_region(rgn_raw)? rgn_raw : [rgn_raw],
rgn = force_region(geom[1]),
anchor = point2d(anchor),
m = rot(from=anchor, to=RIGHT) * move(-[cp.x, cp.y, 0]),
rpts = apply(m, flatten(rgn)),