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refactor

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This commit is contained in:
Justin Lin
2019-05-28 14:28:53 +08:00
parent 599ffdb4ab
commit e0256a0925
2 changed files with 15 additions and 15 deletions
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12
src/__private__/__line_intersection.scad Normal file
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@@ -0,0 +1,12 @@
function __line_intersection(line_pts1, line_pts2) =
let(
a1 = line_pts1[0],
a2 = line_pts1[1],
b1 = line_pts2[0],
b2 = line_pts2[1],
a = a2 - a1,
b = b2 - b1,
s = b1 - a1
)
cross(a, b) == 0 ? [] : // they are parallel or conincident edges
a1 + a * cross(s, b) / cross(a, b);

18
src/bijection_offset.scad
View File

@@ -9,6 +9,7 @@
**/ **/
include <__private__/__edges_from.scad>; include <__private__/__edges_from.scad>;
include <__private__/__line_intersection.scad>;
function _bijection_inward_edge_normal(edge) = function _bijection_inward_edge_normal(edge) =
let( let(
@@ -41,25 +42,12 @@ function _bijection__bijection_offset_edges(edges, d) =
_bijection_offset_edge(edge, dx, dy) _bijection_offset_edge(edge, dx, dy)
]; ];
function _bijection__bijection__bijection_offset_edges_intersection(edge1, edge2) =
let(
a1 = edge1[0],
a2 = edge1[1],
b1 = edge2[0],
b2 = edge2[1],
a = a2 - a1,
b = b2 - b1,
s = b1 - a1
)
cross(a, b) == 0 ? [] : // they are parallel or conincident edges
a1 + a * cross(s, b) / cross(a, b);
function bijection_offset(pts, d) = function bijection_offset(pts, d) =
let( let(
es = __edges_from(pts), es = __edges_from(pts),
offset_es = _bijection__bijection_offset_edges(es, d), offset_es = _bijection__bijection_offset_edges(es, d),
leng = len(offset_es), leng = len(offset_es),
last_p = _bijection__bijection__bijection_offset_edges_intersection(offset_es[leng - 1], offset_es[0]) last_p = __line_intersection(offset_es[leng - 1], offset_es[0])
) )
concat( concat(
[ [
@@ -67,7 +55,7 @@ function bijection_offset(pts, d) =
let( let(
this_edge = offset_es[i], this_edge = offset_es[i],
next_edge = offset_es[i + 1], next_edge = offset_es[i + 1],
p = _bijection__bijection__bijection_offset_edges_intersection(this_edge, next_edge) p = __line_intersection(this_edge, next_edge)
) )
// p == p to avoid [nan, nan], because [nan, nan] != [nan, nan] // p == p to avoid [nan, nan], because [nan, nan] != [nan, nan]
if(p != [] && p == p) p if(p != [] && p == p) p