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add $edge_angle and $edge_length

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Adrian Mariano 2024-09-28 17:45:52 -04:00
parent 55aafee003
commit c88319ca8f
1 changed files with 15 additions and 10 deletions
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25
attachments.scad
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@ -12,6 +12,7 @@
// FileFootnotes: STD=Included in std.scad
//////////////////////////////////////////////////////////////////////
include<structs.scad>
// Default values for attachment code.
$tags=undef; // for backward compatibility
@ -836,6 +837,8 @@ function _make_anchor_legal(anchor,geom) =
// `$attach_anchor` for each anchor given, this is set to the `[ANCHOR, POSITION, ORIENT, SPIN]` information for that anchor.
// if inside is true then set default tag to "remove"
// `$attach_to` is set to the value of the `child` argument, if given. Otherwise, `undef`
// `$edge_angle` is set to the angle of the edge if the anchor is on an edge and the parent is a prismoid or vnf with "hull" anchoring
// `$edge_length` is set to the length of the edge if the anchor is on an edge and the parent is a prismoid or vnf with "hull" anchoring
// Example: Cylinder placed on top of cube:
// cuboid(50)
// attach(TOP,BOT) cylinder(d1=30,d2=15,h=25);
@ -964,6 +967,8 @@ module attach(parent, child, overlap, align, spin=0, norot, inset=0, shiftout=0,
: point3d(anchors[anch_ind]);
$anchor=anchor;
anchor_data = _find_anchor(anchor, $parent_geom);
$edge_angle = len(anchor_data)==5 ? struct_val(anchor_data[4],"edge_angle") : undef;
$edge_length = len(anchor_data)==5 ? struct_val(anchor_data[4],"edge_length") : undef;
anchor_pos = anchor_data[1];
anchor_dir = factor*anchor_data[2];
anchor_spin = two_d || !inside || anchor==TOP || anchor==BOT ? anchor_data[3]
@ -3714,7 +3719,7 @@ function _get_cp(geom) =
/// Arguments:
/// anchor = Vector or named anchor string.
/// geom = The geometry description of the shape.
function _find_anchor(anchor, geom) =
function _find_anchor(anchor, geom)=
is_string(anchor)? (
anchor=="origin"? [anchor, CENTER, UP, 0] // Ok that this returns 3d anchor in the 2d case?
: let(
@ -3779,20 +3784,20 @@ function _find_anchor(anchor, geom) =
v3 = unit(line[1]-line[0],UP) * anch.z
)
unit(v3,UP),
edgeang = len(facevecs)==2 ? 180-vector_angle(facevecs[0], facevecs[1]) : undef,
final_dir = default(override[1],anch==CENTER?UP:rot(from=UP, to=axis, p=dir)),
final_pos = default(override[0],rot(from=UP, to=axis, p=pos)),
// If the anchor is on a face or horizontal edge we take the oang value for spin
// If the anchor is on a vertical or sloped edge or corner we want to align the spin to point upward along the edge
spin = anch.x!=0 && anch.y!=0 ? _compute_spin(final_dir, rot(from=UP, to=axis, p=edge)) // Set "vertical" edge and corner anchors point along the edge
: anch.z!=0 && sum(v_abs(anch))==2 ? _compute_spin(final_dir, rot(from=UP, to=axis, p=anch.z*[anch.y,-anch.x,0])) // Horizontal anchors point clockwise
// Set "vertical" edge and corner anchors point along the edge
spin = anch.x!=0 && anch.y!=0 ? _compute_spin(final_dir, rot(from=UP, to=axis, p=edge))
// Horizontal anchors point clockwise
: anch.z!=0 && sum(v_abs(anch))==2 ? _compute_spin(final_dir, rot(from=UP, to=axis, p=anch.z*[anch.y,-anch.x,0]))
: norm(anch)==3 ? _compute_spin(final_dir, final_dir==DOWN || final_dir==UP ? BACK : UP)
: oang // face anchors point UP/BACK
//spin = anchor.x!=0 && anchor.y!=0 ? _compute_spin(dir, edge)
// : anchor.z!=0 && (anchor.x!=0 || anchor.y!=0) ? _compute_spin(dir, _canonical_edge([anchor.y,anchor.x,0]))
// : oang
) [anchor, final_pos, final_dir, default(override[2],spin)]
) [anchor, final_pos, final_dir, default(override[2],spin), if (is_def(edgeang)) [["edge_angle",edgeang],["edge_length",norm(edge)]]]
) : type == "conoid"? ( //r1, r2, l, shift
let(
rr1=geom[1],
@ -3969,8 +3974,8 @@ function _find_anchor(anchor, geom) =
edgedir = edge[1]-edge[0]
)
_compute_spin(direction, flip*edgedir)
)
[direction,spin]
)
[direction,spin,[["edge_angle",ang],["edge_length",norm(edge[0]-edge[1])]]]
: let( // This section handles corner anchors, currently spins just point up
vertices = vnf[0],
faces = vnf[1],
@ -3989,7 +3994,7 @@ function _find_anchor(anchor, geom) =
avep = sum(select(rpts,idxs))/len(idxs),
mpt = approx(point2d(anchor),[0,0])? [maxx,0,0] : avep,
pos = point3d(cp) + rot(from=RIGHT, to=anchor, p=mpt)
) [anchor, default(override[0],pos),default(override[1],dir[0]),default(override[2],dir[1])]
) [anchor, default(override[0],pos),default(override[1],dir[0]),default(override[2],dir[1]),if (len(dir)==3) dir[2]]
) : type == "trapezoid"? ( //size, size2, shift, override
let(all_comps_good = [for (c=anchor) if (c!=sign(c)) 1]==[])
assert(all_comps_good, "All components of an anchor for a rectangle/trapezoid must be -1, 0, or 1")