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Fix for issue #666

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Garth Minette 2022-07-28 18:40:21 -07:00
parent 6047cee208
commit 60b84331e9
2 changed files with 30 additions and 13 deletions
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40
drawing.scad
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@ -552,41 +552,57 @@ module stroke(
// ---
// width = The width of the dashed line to draw. Module only. Default: 1
// closed = If true, treat path as a closed polygon. Default: false
// fit = If true, shrink or stretch the dash pattern so that the path ends ofter a logical dash. Default: true
// roundcaps = (Module only) If true, draws dashes with rounded caps. This often looks better. Default: true
// mindash = (Function only) Specifies the minimal dash length to return at the end of a path when fit is false. Default: 0.5
// Example(2D): Open Path
// path = [for (a=[-180:10:180]) [a/3,20*sin(a)]];
// dashed_stroke(path, [3,2], width=1);
// Example(2D): Closed Polygon
// path = circle(d=100,$fn=72);
// dashpat = [10,2,3,2,3,2];
// dashpat = [10,2, 3,2, 3,2];
// dashed_stroke(path, dashpat, width=1, closed=true);
// Example(FlatSpin,VPD=250): 3D Dashed Path
// path = [for (a=[-180:5:180]) [a/3, 20*cos(3*a), 20*sin(3*a)]];
// dashed_stroke(path, [3,2], width=1);
function dashed_stroke(path, dashpat=[3,3], closed=false) =
is_region(path) ? [for(p=path) each dashed_stroke(p,dashpat,closed=true)] :
function dashed_stroke(path, dashpat=[3,3], closed=false, fit=true, mindash=0.5) =
is_region(path) ? [
for (p = path)
each dashed_stroke(p, dashpat, closed=true, fit=fit)
] :
let(
path = closed? close_path(path) : path,
dashpat = len(dashpat)%2==0? dashpat : concat(dashpat,[0]),
plen = path_length(path),
dlen = sum(dashpat),
doff = cumsum(dashpat),
reps = floor(plen / dlen),
step = plen / reps,
freps = plen / dlen,
reps = max(1, fit? round(freps) : floor(freps)),
tlen = !fit? plen :
reps * dlen + (closed? 0 : dashpat[0]),
sc = plen / tlen,
cuts = [
for (i=[0:1:reps-1], off=doff)
let (st=i*step, x=st+off)
if (x>0 && x<plen) x
for (i = [0:1:reps], off = doff*sc)
let (x = i*dlen*sc + off)
if (x > 0 && x < plen) x
],
dashes = path_cut(path, cuts, closed=false),
evens = [for (i=idx(dashes)) if (i%2==0) dashes[i]]
dcnt = len(dashes),
evens = [
for (i = idx(dashes))
if (i % 2 == 0)
let( dash = dashes[i] )
if (i < dcnt-1 || path_length(dash) > mindash)
dashes[i]
]
) evens;
module dashed_stroke(path, dashpat=[3,3], width=1, closed=false) {
module dashed_stroke(path, dashpat=[3,3], width=1, closed=false, fit=true, roundcaps=false) {
no_children($children);
segs = dashed_stroke(path, dashpat=dashpat*width, closed=closed);
segs = dashed_stroke(path, dashpat=dashpat*width, closed=closed, fit=fit, mindash=0.5*width);
for (seg = segs)
stroke(seg, width=width, endcaps=false);
stroke(seg, width=width, endcaps=roundcaps? "round" : false);
}

3
nema_steppers.scad
View file

@ -16,7 +16,8 @@
// Usage:
// nema_stepper_motor(size, h, shaft_len, ...) [attachments];
// Topics: Parts, Motors
// Description: Creates a model of a NEMA 11 stepper motor.
// Description:
// Creates a model of a NEMA standard stepper motor.
// Arguments:
// size = The NEMA standard size of the stepper motor.
// h = Length of motor body. Default: 24mm