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include <hollow_out.scad>;
include <archimedean_spiral.scad>;
head_size = 26;
segments = 99;
thickness = 3;
spacing = 0.65;
module joint_Y(leng, width, height, ring_offset, thickness) {
half_h = height / 2;
half_thickness = thickness / 2;
inner_leng = leng - thickness * 2;
inner_width = width - thickness * 2;
// U
linear_extrude(height, center = true)
difference() {
hollow_out(thickness)
offset(delta = thickness, chamfer = true)
square([inner_leng, inner_width], center = true);
translate([-half_thickness - inner_leng / 2, 0, 0])
square([thickness, inner_width], center = true);
}
// ring
r = half_h;
offset_x = ring_offset - r / 4;
translate([half_h + inner_leng / 2 + half_thickness, 0, 0])
rotate([90, 0, 0])
linear_extrude(thickness, center = true)
difference() {
hull() {
translate([offset_x, 0])
circle(r);
translate([-r / 2, 0, 0])
square([r, height], center = true);
}
translate([offset_x, 0])
circle(r - thickness);
}
}
module moving_fish(head_size, segments, thickness, spacing) {
joint_leng = thickness * 2;
joint_height = thickness * 2 + spacing * 2;
joint_thickness = joint_leng / 3;
joint_width = joint_thickness + (spacing + joint_thickness) * 2;
ring_offset = joint_thickness / 2;
module tri_bone(tri_side_leng) {
double_spacing = spacing * 2;
tri_r = tri_side_leng * 0.5773502;
tri_r_m1 = tri_r - 1;
half_tri_r_m1 = tri_r_m1 / 2;
slot_leng = joint_thickness + double_spacing;
translate([0, 0, half_tri_r_m1 + 1]) {
translate([slot_leng, 0, joint_height / 2 - half_tri_r_m1 - 1])
rotate([90, 0, 0])
joint_Y(
joint_leng,
joint_width,
joint_height,
joint_thickness/ 2 ,
joint_thickness
);
offset_x = (-tri_r - 1 + joint_width) / 2;
rotate([0, -90, 0]) {
// triangle
linear_extrude(thickness, center = true)
difference() {
offset(r = 1)
circle(tri_r_m1, $fn = 3);
// slot
translate([offset_x, 0, 0])
square(
[
slot_leng,
joint_height + double_spacing
],
center = true
);
}
// stick
translate([offset_x, 0, 0])
rotate([90, 0, 0])
rotate([0, 90, 0])
linear_extrude(slot_leng, center = true)
circle(joint_height / 2 - joint_thickness - spacing);
}
}
}
module head(tri_leng) {
tri_leng_d2 = tri_leng / 2;
tri_leng_d4 = tri_leng / 4;
tri_leng_d5 = tri_leng / 5;
module eye() {
translate([tri_leng_d4, tri_leng_d5, tri_leng_d5])
sphere(tri_leng / 10);
}
tri_r_m1 = tri_leng * 0.5773502 - 1;
mr = tri_leng_d4 * 0.8660254;
translate([0, 0, tri_r_m1 / 2 + 1])
rotate([0, -90, 0]) {
difference() {
hull() {
linear_extrude(thickness, center = true)
offset(r = 1)
circle(tri_r_m1, $fn = 3);
translate([tri_leng / 14 * 3, 0, tri_leng_d2])
sphere(mr);
translate([-tri_leng_d4, 0, tri_leng_d2])
sphere(mr);
}
linear_extrude(tri_leng * 1.5, center = true)
translate([-tri_leng / 2 - tri_r_m1 / 2 - 1, 0, 0])
square([tri_leng, tri_leng], center = true);
translate([0, 0, tri_leng / 1.25])
rotate([90, 0, 0])
scale([0.75, 1, 1])
linear_extrude(tri_leng, center = true)
circle(tri_leng / 1.5, $fn = 3);
}
// eyes
eye();
mirror([0, 1, 0]) eye();
}
}
point_distance = joint_leng + ring_offset + spacing * 3;
arm_distance = head_size;
init_angle = 540;
num_of_points = segments + 2;
points_angles = archimedean_spiral(
arm_distance = arm_distance,
init_angle = init_angle,
point_distance = point_distance,
num_of_points = num_of_points
);
side_leng_step = 0.45 * head_size / segments;
// head
rotate(init_angle)
translate(-points_angles[0][0])
rotate(90) {
tri_bone(head_size);
head(head_size);
}
// body
leng_pts = len(points_angles);
for(i = [1: leng_pts - 2]) {
translate(points_angles[i][0])
rotate(points_angles[i][1] + 90)
tri_bone(head_size - side_leng_step * i);
}
tail_r = head_size / 3;
// tail
translate(points_angles[leng_pts - 1][0])
linear_extrude(joint_height)
rotate(90 + points_angles[leng_pts - 2][1])
translate([tail_r / 2, 0, 0]) {
difference() {
circle(tail_r);
translate([tail_r * 0.75, 0, 0])
circle(tail_r);
}
hollow_out(thickness / 2.4)
circle(3 * thickness / 2.4);
}
}
moving_fish(head_size, segments, thickness, spacing, $fn = 24);
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