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add px_spiral_text

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Justin Lin
2019-08-31 16:32:24 +08:00
parent 76c7d15179
commit e32402649c
1 changed files with 54 additions and 0 deletions
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examples/px_spiral_text.scad Normal file
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include <hull_polyline2d.scad>;
tx = "3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989";
pts = px_spiral(1, floor(sqrt(len(tx))) + 1);
linear_extrude(.5) for(i = [0:len(tx) - 1]) {
translate(pts[i]) difference() {
circle(.4, $fn = 24);
color("white") text(tx[i], font = "Arial Black", size = .5, valign = "center", halign = "center");
}
}
linear_extrude(.25) {
for(i = [0:len(tx) - 1]) {
translate(pts[i])
circle(.4, $fn = 24);
}
hull_polyline2d([for(i = [0:len(tx) - 1]) pts[i]], width = 0.25);
}
function _px_spiral_forward(pt, leng, dir, clockwise) =
let(
DIRS = clockwise ? [
[1, 0],
[0, -1],
[-1, 0],
[0, 1]
]
: [
[1, 0],
[0, 1],
[-1, 0],
[0, -1]
]
)
pt + DIRS[dir] * leng;
function _px_spiral_go_turn(from, leng, max_leng, clockwise, dir) =
let(
range = [1:leng],
pts = [for(i = range) _px_spiral_forward(from, i, dir % 4, clockwise)],
ps = pts[len(pts) - 1],
pts2 = [for(i = range) _px_spiral_forward(ps, i, (dir + 1) % 4, clockwise)],
pd = pts2[len(pts2) - 1]
)
concat(pts, pts2, _px_spiral(pd, leng + 1, max_leng, clockwise, dir + 2));
function _px_spiral(from, leng, max_leng, clockwise, dir) =
leng > max_leng ? [] : _px_spiral_go_turn(from, leng, max_leng, clockwise, dir);
function px_spiral(init_leng, max_leng, clockwise = false) =
let(
org = [0, 0]
)
concat([org], _px_spiral(org, init_leng, max_leng, clockwise, 0));