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add twist_taiji

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Justin Lin 2021-08-09 16:45:11 +08:00
parent bbe59b9dbb
commit 401c6baca4
1 changed files with 75 additions and 0 deletions
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examples/spiral/twist_taiji.scad Normal file
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use <pie.scad>;
radius = 15;
height = 90;
twist = 360;
spacing = 0.35;
$fn = 96;
animation_demo = "NO"; // [YES, NO]
if(animation_demo == "YES") {
animation();
}
else {
magatama(radius, height, "yang", spacing);
translate([radius * 2, 0])
magatama_dot(radius, height, "ying", spacing);
}
module magatama(radius, height, type, spacing) {
half_r = radius / 2;
color(type == "ying" ? "DarkSlateGray" : "white")
linear_extrude(height, twist = twist)
difference() {
offset(r = -spacing)
union() {
difference() {
pie(radius, [0, 180]);
translate([-half_r, 0])
circle(half_r);
}
translate([half_r, 0])
circle(half_r);
}
translate([half_r, 0])
offset(r = spacing)
circle(half_r / 3);
}
}
module magatama_dot(radius, height, type, spacing = 0.4) {
half_r = radius / 2;
color(type == "ying" ? "black" : "white")
linear_extrude(height, twist = twist)
translate([half_r, 0])
offset(r = -spacing)
circle(half_r / 3);
}
module animation() {
if($t <= 0.5) {
magatama(radius, height, "ying", spacing);
rotate($t * 2 * twist + 180)
translate([0, 0, height - height * 2 * $t])
magatama(radius, height, "yang", spacing);
}
else {
magatama(radius, height, "ying", spacing);
rotate(180)
magatama(radius, height, "yang", spacing);
t = $t - 0.5;
rotate(t * 2 * twist + 180)
translate([0, 0, height - height * 2 * t]) {
magatama_dot(radius, height, "ying", spacing);
rotate(180)
magatama_dot(radius, height, "wang", spacing);
}
}
}