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Better error checking in bezier routines.

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Revar Desmera
2020-04-11 14:10:07 -07:00
parent 82aaa28471
commit ddca297bba
3 changed files with 21 additions and 8 deletions
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25
beziers.scad
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@@ -318,12 +318,18 @@ function bezier_path_length(path, N=3, max_deflect=0.001) =
// ];
// trace_polyline(bez, size=1, N=3, showpts=true);
// trace_polyline(bezier_polyline(bez, N=3), size=3);
function bezier_polyline(bezier, splinesteps=16, N=3) = let(
function bezier_polyline(bezier, splinesteps=16, N=3) =
assert(is_path(bezier))
assert(is_int(N))
assert(is_int(splinesteps))
assert(len(bezier)%N == 1, str("A degree ",N," bezier path shound have a multiple of ",N," points in it, plus 1."))
let(
segs = (len(bezier)-1)/N
) concat(
[for (seg = [0:1:segs-1], i = [0:1:splinesteps-1]) bezier_path_point(bezier, seg, i/splinesteps, N=N)],
[bezier_path_point(bezier, segs-1, 1, N=N)]
);
) deduplicate([
for (seg = [0:1:segs-1], i = [0:1:splinesteps-1])
bezier_path_point(bezier, seg, i/splinesteps, N=N),
bezier_path_point(bezier, segs-1, 1, N=N)
]);
@@ -412,6 +418,9 @@ function fillet_path(pts, fillet, maxerr=0.1) = concat(
// closed = bezier_close_to_axis(bez, axis="Y");
// trace_bezier(closed, size=1);
function bezier_close_to_axis(bezier, N=3, axis="X") =
assert(is_path(bezier))
assert(is_int(N))
assert(len(bezier)%N == 1, str("A degree ",N," bezier path shound have a multiple of ",N," points in it, plus 1."))
let(
bezend = len(bezier)-1,
sp = bezier[0],
@@ -449,6 +458,10 @@ function bezier_close_to_axis(bezier, N=3, axis="X") =
// closed = bezier_offset([-5,0], bez);
// trace_bezier(closed, size=1);
function bezier_offset(offset, bezier, N=3) =
assert(is_num(offset))
assert(is_path(bezier))
assert(is_int(N))
assert(len(bezier)%N == 1, str("A degree ",N," bezier path shound have a multiple of ",N," points in it, plus 1."))
let(
backbez = reverse([ for (pt = bezier) pt+offset ]),
bezend = len(bezier)-1
@@ -638,7 +651,7 @@ module bezier_sweep_bezier(bezier, path, pathsteps=16, bezsteps=16, bezN=3, path
// ];
// trace_bezier(bez, N=3, size=0.5);
module trace_bezier(bez, N=3, size=1) {
trace_polyline(bez, N=N, showpts=true, size=size/2, color="green");
trace_polyline(bez, N=N, showpts=true, size=size, color="green");
trace_polyline(bezier_polyline(bez, N=N), size=size, color="cyan");
}