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fix bug in spherical_random_points (non-uniform)

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add region support to dashed_stroke
move a bunch of functions around for reorganization
This commit is contained in:
Adrian Mariano
2021-09-30 23:11:01 -04:00
parent 956ae7076c
commit 261099e102
9 changed files with 448 additions and 405 deletions
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76
regions.scad
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@@ -35,26 +35,6 @@
function is_region(x) = is_list(x) && is_path(x.x);
// Function: close_region()
// Usage:
// close_region(region);
// Description:
// Closes all paths within a given region.
function close_region(region, eps=EPSILON) = [for (path=region) close_path(path, eps=eps)];
// Function: cleanup_region()
// Usage:
// cleanup_region(region);
// Description:
// For all paths in the given region, if the last point coincides with the first point, removes the last point.
// Arguments:
// region = The region to clean up. Given as a list of polygon paths.
// eps = Acceptable variance. Default: `EPSILON` (1e-9)
function cleanup_region(region, eps=EPSILON) =
[for (path=region) cleanup_path(path, eps=eps)];
// Function: check_and_fix_path()
// Usage:
@@ -329,7 +309,24 @@ function _join_paths_at_vertices(path1,path2,seg1,seg2) =
) cleanup_path(deduplicate([each path1, each path2]));
function _cleave_simple_region(region) =
function new_join_paths_at_vertices(path1,path2,v1,v2) =
let(
repeat_start = !approx(path1[v1],path2[v2]),
path1 = clockwise_polygon(polygon_shift(path1,v1)),
path2 = ccw_polygon(polygon_shift(path2,v2))
)
[
each path1,
if (repeat_start) path1[0],
each path2,
if (repeat_start) path2[0],
];
// Given a region that is connected and has its outer border in region[0],
// produces a polygon with the same points that has overlapping connected paths
// to join internal holes to the outer border.
function _cleave_connected_region(region) =
len(region)==0? [] :
len(region)<=1? clockwise_polygon(region[0]) :
let(
@@ -338,7 +335,36 @@ function _cleave_simple_region(region) =
_path_path_closest_vertices(region[0],region[i])
],
idxi = min_index(subindex(dists,0)),
newoline = _join_paths_at_vertices(
outline = _join_paths_at_vertices(
region[0], region[idxi+1],
dists[idxi][1], dists[idxi][2]
)
)
len(region)==2? clockwise_polygon(outline) : // We joined 2 regions, so we're done
let(
newregion = [
outline,
for (i=idx(region))
if (i>0 && i!=idxi+1)
region[i]
]
)
assert(len(newregion)<len(region))
_cleave_connected_region(newregion);
function new_cleave_connected_region(region) =
len(region)==0? [] :
len(region)<=1? clockwise_polygon(region[0]) :
let(
dists = [
for (i=[1:1:len(region)-1])
_path_path_closest_vertices(region[0],region[i])
],
idxi = min_index(subindex(dists,0)),
newoline = new_join_paths_at_vertices(
region[0], region[idxi+1],
dists[idxi][1], dists[idxi][2]
)
@@ -352,8 +378,8 @@ function _cleave_simple_region(region) =
]
)
assert(len(orgn)<len(region))
_cleave_simple_region(orgn);
new_cleave_connected_region(orgn);
// Function: region_faces()
// Usage:
@@ -372,7 +398,7 @@ function region_faces(region, transform, reverse=false, vnf=EMPTY_VNF) =
vnfs = [
if (vnf != EMPTY_VNF) vnf,
for (rgn = regions) let(
cleaved = path3d(_cleave_simple_region(rgn)),
cleaved = path3d(_cleave_connected_region(rgn)),
face = is_undef(transform)? cleaved : apply(transform,cleaved),
faceidxs = reverse? [for (i=[len(face)-1:-1:0]) i] : [for (i=[0:1:len(face)-1]) i]
) [face, [faceidxs]]