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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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17
regions.scad
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@@ -278,13 +278,16 @@ function force_region(poly) = is_path(poly) ? [poly] : poly;
// Module: region()
// Usage:
// region(r);
// region(r, [anchor], [spin], [cp]) { ... };
// Description:
// Creates the 2D polygons described by the given region or list of polygons. This module works on
// arbitrary lists of polygons that cross each other and hence do not define a valid region. The
// displayed result is the exclusive-or of the polygons listed in the input.
// Arguments:
// r = region to create as geometry
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `"origin"`
// spin = Rotate this many degrees after anchor. See [spin](attachments.scad#spin). Default: `0`
// cp = Centerpoint for determining intersection anchors or centering the shape. Determintes the base of the anchor vector. Can be "centroid", "mean", "box" or a 2D point. Default: "centroid"
// Example(2D): Displaying a region
// region([circle(d=50), square(25,center=true)]);
// Example(2D): Displaying a list of polygons that intersect each other, which is not a region
@@ -293,16 +296,18 @@ function force_region(poly) = is_path(poly) ? [poly] : poly;
// [square([60,10], center=true)]
// );
// region(rgn);
module region(r)
module region(r, anchor="origin", spin=0, cp="centroid")
{
no_children($children);
r = force_region(r);
dummy=assert(is_region(r), "Input is not a region");
points = flatten(r);
lengths = [for(path=r) len(path)];
starts = [0,each cumsum(lengths)];
paths = [for(i=idx(r)) count(s=starts[i], n=lengths[i])];
polygon(points=points, paths=paths);
attachable(anchor, spin, two_d=true, region=r, extent=false, cp=cp){
polygon(points=points, paths=paths);
children();
}
}
@@ -583,7 +588,7 @@ function region_parts(region) =
// Function&Module: linear_sweep()
// Usage:
// linear_sweep(region, height, [center], [slices], [twist], [scale], [style], [convexity]);
// linear_sweep(region, height, [center], [slices], [twist], [scale], [style], [convexity]) {attachments};
// Description:
// If called as a module, creates a polyhedron that is the linear extrusion of the given 2D region or polygon.
// If called as a function, returns a VNF that can be used to generate a polyhedron of the linear extrusion
@@ -630,7 +635,7 @@ function region_parts(region) =
// mrgn = union(rgn1,rgn2);
// orgn = difference(mrgn,rgn3);
// linear_sweep(orgn,height=20,convexity=16) show_anchors();
module linear_sweep(region, height=1, center, twist=0, scale=1, slices, maxseg, style="default", convexity, anchor_isect=false, anchor, spin=0, orient=UP, cp="centroid", anchor="origin") {
module linear_sweep(region, height=1, center, twist=0, scale=1, slices, maxseg, style="default", convexity, anchor_isect=false, spin=0, orient=UP, cp="centroid", anchor="origin") {
region = force_region(region);
dummy=assert(is_region(region),"Input is not a region");
anchor = center ? "zcenter" : anchor;