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Added "sideN" named anchors for Ngons.

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Revar Desmera
2020-05-06 17:17:45 -07:00
parent 33c8d80432
commit ef7acd1c10
4 changed files with 42 additions and 17 deletions
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32
shapes2d.scad
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@@ -878,6 +878,8 @@ function oval(r, d, realign=false, circum=false, anchor=CENTER, spin=0) =
// realign = If false, a tip is aligned with the Y+ axis. If true, the midpoint of a side is aligned with the Y+ axis. Default: false
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
// Extra Anchors:
// "side0", "side1", etc. = The center of each side has an anchor, pointing outwards.
// Example(2D): by Outer Size
// regular_ngon(n=5, or=30);
// regular_ngon(n=5, od=60);
@@ -914,8 +916,17 @@ function regular_ngon(n=6, r, d, or, od, ir, id, side, rounding=0, realign=false
maxx_idx = max_index(subindex(path2,0)),
path3 = polygon_shift(path2,maxx_idx)
) path3
)
) reorient(anchor,spin, two_d=true, path=path, extent=false, p=path);
),
anchors = !is_string(anchor)? [] : [
for (i = [0:1:n-1]) let(
a1 = 360 - i*360/n - (realign? 180/n : 0),
a2 = a1 - 360/n,
p1 = polar_to_xy(r,a1),
p2 = polar_to_xy(r,a2),
pos = (p1+p2)/2
) anchorpt(str("side",i), pos, unit(pos), 0)
]
) reorient(anchor,spin, two_d=true, path=path, extent=false, p=path, anchors=anchors);
module regular_ngon(n=6, r, d, or, od, ir, id, side, rounding=0, realign=false, anchor=CENTER, spin=0) {
@@ -923,7 +934,16 @@ module regular_ngon(n=6, r, d, or, od, ir, id, side, rounding=0, realign=false,
r = get_radius(r1=ir*sc, r2=or, r=r, d1=id*sc, d2=od, d=d, dflt=side/2/sin(180/n));
assert(!is_undef(r), "regular_ngon(): need to specify one of r, d, or, od, ir, id, side.");
path = regular_ngon(n=n, r=r, rounding=rounding, realign=realign);
attachable(anchor,spin, two_d=true, path=path, extent=false) {
anchors = [
for (i = [0:1:n-1]) let(
a1 = 360 - i*360/n - (realign? 180/n : 0),
a2 = a1 - 360/n,
p1 = polar_to_xy(r,a1),
p2 = polar_to_xy(r,a2),
pos = (p1+p2)/2
) anchorpt(str("side",i), pos, unit(pos), 0)
];
attachable(anchor,spin, two_d=true, path=path, extent=false, anchors=anchors) {
polygon(path);
children();
}
@@ -950,6 +970,8 @@ module regular_ngon(n=6, r, d, or, od, ir, id, side, rounding=0, realign=false,
// realign = If false, a tip is aligned with the Y+ axis. If true, the midpoint of a side is aligned with the Y+ axis. Default: false
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
// Extra Anchors:
// "side0" ... "side4" = The center of each side has an anchor, pointing outwards.
// Example(2D): by Outer Size
// pentagon(or=30);
// pentagon(od=60);
@@ -990,6 +1012,8 @@ module pentagon(r, d, or, od, ir, id, side, rounding=0, realign=false, anchor=CE
// realign = If false, a tip is aligned with the Y+ axis. If true, the midpoint of a side is aligned with the Y+ axis. Default: false
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
// Extra Anchors:
// "side0" ... "side5" = The center of each side has an anchor, pointing outwards.
// Example(2D): by Outer Size
// hexagon(or=30);
// hexagon(od=60);
@@ -1030,6 +1054,8 @@ module hexagon(r, d, or, od, ir, id, side, rounding=0, realign=false, anchor=CEN
// realign = If false, a tip is aligned with the Y+ axis. If true, the midpoint of a side is aligned with the Y+ axis. Default: false
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
// Extra Anchors:
// "side0" ... "side7" = The center of each side has an anchor, pointing outwards.
// Example(2D): by Outer Size
// octagon(or=30);
// octagon(od=60);