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Added EMPTY_VNF

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Revar Desmera
2020-03-09 18:35:14 -07:00
parent 37392e1376
commit 2551f19939
3 changed files with 14 additions and 11 deletions
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15
vnf.scad
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@@ -20,6 +20,9 @@ include <triangulation.scad>
// merge the various VNFs to get the completed polyhedron vertex list and faces.
EMPTY_VNF = [[],[]]; // The standard empty VNF with no vertices or faces.
// Function: is_vnf()
// Description: Returns true if the given value looks passingly like a VNF structure.
function is_vnf(x) = is_list(x) && len(x)==2 && is_list(x[0]) && is_list(x[1]) && (x[0]==[] || is_vector(x[0][0])) && (x[1]==[] || is_vector(x[1][0]));
@@ -56,7 +59,7 @@ function vnf_faces(vnf) = vnf[1];
// vnf2 = vnf_get_vertex(vnf1, p=[3,2,1]); // Returns: [1, [[[3,5,8],[3,2,1]],[]]]
// vnf3 = vnf_get_vertex(vnf2, p=[3,5,8]); // Returns: [0, [[[3,5,8],[3,2,1]],[]]]
// vnf4 = vnf_get_vertex(vnf3, p=[[1,3,2],[3,2,1]]); // Returns: [[1,2], [[[3,5,8],[3,2,1],[1,3,2]],[]]]
function vnf_get_vertex(vnf=[[],[]], p) =
function vnf_get_vertex(vnf=EMPTY_VNF, p) =
is_path(p)? _vnf_get_vertices(vnf, p) :
assert(is_vnf(vnf))
assert(is_vector(p))
@@ -73,7 +76,7 @@ function vnf_get_vertex(vnf=[[],[]], p) =
// Internal use only
function _vnf_get_vertices(vnf=[[],[]], pts, _i=0, _idxs=[]) =
function _vnf_get_vertices(vnf=EMPTY_VNF, pts, _i=0, _idxs=[]) =
_i>=len(pts)? [_idxs, vnf] :
let(
vvnf = vnf_get_vertex(vnf, pts[_i])
@@ -90,7 +93,7 @@ function _vnf_get_vertices(vnf=[[],[]], pts, _i=0, _idxs=[]) =
// Arguments:
// vnf = The VNF structure to add a face to.
// pts = The vertex points for the face.
function vnf_add_face(vnf=[[],[]], pts) =
function vnf_add_face(vnf=EMPTY_VNF, pts) =
assert(is_vnf(vnf))
assert(is_path(pts))
let(
@@ -114,7 +117,7 @@ function vnf_add_face(vnf=[[],[]], pts) =
// Arguments:
// vnf = The VNF structure to add a face to.
// faces = The list of faces, where each face is given as a list of vertex points.
function vnf_add_faces(vnf=[[],[]], faces, _i=0) =
function vnf_add_faces(vnf=EMPTY_VNF, faces, _i=0) =
(assert(is_vnf(vnf)) assert(is_list(faces)) _i>=len(faces))? vnf :
vnf_add_faces(vnf_add_face(vnf, faces[_i]), faces, _i=_i+1);
@@ -124,7 +127,7 @@ function vnf_add_faces(vnf=[[],[]], faces, _i=0) =
// vnf = vnf_merge([VNF, VNF, VNF, ...]);
// Description:
// Given a list of VNF structures, merges them all into a single VNF structure.
function vnf_merge(vnfs=[],_i=0,_acc=[[],[]]) =
function vnf_merge(vnfs=[],_i=0,_acc=EMPTY_VNF) =
(assert(is_vnf_list(vnfs)) _i>=len(vnfs))? _acc :
vnf_merge(
vnfs, _i=_i+1,
@@ -224,7 +227,7 @@ function vnf_vertex_array(
row_wrap=false,
reverse=false,
style="default",
vnf=[[],[]]
vnf=EMPTY_VNF
) =
assert((!caps)||(caps&&col_wrap))
assert(in_list(style,["default","alt","quincunx"]))