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refactor: reuse matrix

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This commit is contained in:
Justin Lin 2022-05-11 10:11:25 +08:00
parent dce855611c
commit fc5965267f
1 changed files with 11 additions and 4 deletions
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15
src/_impl/_shape_path_extend_impl.scad
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@ -17,22 +17,29 @@ function __polytransversals(transversals) =
function _az(p1, p2) = let(v = p2 - p1) -90 + atan2(v.y, v.x); function _az(p1, p2) = let(v = p2 - p1) -90 + atan2(v.y, v.x);
function _rz_matrix(p1, p2) =
let(v = p2 - p1, a = -90 + atan2(v.y, v.x), c = cos(a), s = sin(a))
[
[ c, s],
[-s, c],
];
function _first_stroke(stroke_pts, path_pts) = function _first_stroke(stroke_pts, path_pts) =
let( let(
p1 = path_pts[0], p1 = path_pts[0],
p2 = path_pts[1], p2 = path_pts[1],
a = _az(p1, p2) m = _rz_matrix(p1, p2)
) )
[for(p = stroke_pts) ptf_rotate(p, a) + p1]; [for(p = stroke_pts) p * m + p1];
function _stroke(stroke_pts, p1, p2, scale_step, i) = function _stroke(stroke_pts, p1, p2, scale_step, i) =
let( let(
leng = norm(__to3d(p2) - __to3d(p1)), leng = norm(__to3d(p2) - __to3d(p1)),
a = _az(p1, p2), m = _rz_matrix(p1, p2),
s = 1 + scale_step * i, s = 1 + scale_step * i,
off_p = [0, leng] off_p = [0, leng]
) )
[for(p = stroke_pts) ptf_rotate(p * s + off_p, a) + p1]; [for(p = stroke_pts * s) (p + off_p) * m + p1];
function _inner(stroke_pts, path_pts, leng_path_pts, scale_step) = function _inner(stroke_pts, path_pts, leng_path_pts, scale_step) =
[ [