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add px_spiral_text
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54
examples/px_spiral_text.scad
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54
examples/px_spiral_text.scad
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include <hull_polyline2d.scad>;
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tx = "3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989";
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pts = px_spiral(1, floor(sqrt(len(tx))) + 1);
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linear_extrude(.5) for(i = [0:len(tx) - 1]) {
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translate(pts[i]) difference() {
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circle(.4, $fn = 24);
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color("white") text(tx[i], font = "Arial Black", size = .5, valign = "center", halign = "center");
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}
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}
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linear_extrude(.25) {
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for(i = [0:len(tx) - 1]) {
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translate(pts[i])
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circle(.4, $fn = 24);
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}
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hull_polyline2d([for(i = [0:len(tx) - 1]) pts[i]], width = 0.25);
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}
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function _px_spiral_forward(pt, leng, dir, clockwise) =
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let(
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DIRS = clockwise ? [
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[1, 0],
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[0, -1],
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[-1, 0],
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[0, 1]
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]
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: [
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[1, 0],
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[0, 1],
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[-1, 0],
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[0, -1]
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]
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)
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pt + DIRS[dir] * leng;
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function _px_spiral_go_turn(from, leng, max_leng, clockwise, dir) =
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let(
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range = [1:leng],
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pts = [for(i = range) _px_spiral_forward(from, i, dir % 4, clockwise)],
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ps = pts[len(pts) - 1],
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pts2 = [for(i = range) _px_spiral_forward(ps, i, (dir + 1) % 4, clockwise)],
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pd = pts2[len(pts2) - 1]
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)
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concat(pts, pts2, _px_spiral(pd, leng + 1, max_leng, clockwise, dir + 2));
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function _px_spiral(from, leng, max_leng, clockwise, dir) =
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leng > max_leng ? [] : _px_spiral_go_turn(from, leng, max_leng, clockwise, dir);
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function px_spiral(init_leng, max_leng, clockwise = false) =
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let(
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org = [0, 0]
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)
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concat([org], _px_spiral(org, init_leng, max_leng, clockwise, 0));
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