/*
 * Copyright (c) Camden Dixie O'Brien
 * SPDX-License-Identifier: AGPL-3.0-only
 */

module hemisphere (radius)
{
  difference() {
	sphere(radius);
	translate([0, -radius, -radius]) cube([radius, 2 * radius, 2 * radius]);
  }
}

module cup (cup_radius, cup_thickness, cup_offset, spoke_length, spoke_radius)
{
  translate([0, cup_radius + spoke_length, 0]) scale([1, -1, 1])
	difference() {
	union() {
	  translate([spoke_radius + cup_offset, 0, 0]) hemisphere(cup_radius);
	  rotate([-90, 0, 0])
		cylinder(cup_radius + spoke_length, r = spoke_radius);
	}
	translate([spoke_radius + cup_offset, 0, 0]) sphere(cup_radius - cup_thickness);
  };
}

module cups (n_cups, hub_height, hub_outer_radius, hub_inner_radius,
			 cup_radius, cup_thickness, cup_offset, spoke_length,
			 spoke_radius)
{
  difference() {
	union() {
	  cylinder(hub_height, r = hub_outer_radius, center = true);
	  for (i = [0 : n_cups - 1]) {
		rotate([0, 0, i * 360 / n_cups])
		  cup(cup_radius, cup_thickness, cup_offset, spoke_length,
			  spoke_radius);
	  }
	}
	cylinder(hub_height + 1, r = hub_inner_radius, center = true);
  }
}

cups(5, 20, 18, 6, 40, 3, 6, 60, 8);