// -*- C -*-

main_dia = 71.2 + 0.50;
top_thick = 4;

main_cnr = 4.0;

rivet_posn = 6.0;
rivet_thick = 1.67;
rivet_width = 4.15 + 1.0;
rivet_tall = 5.51 + 0.49;

over_rivet_wall = 0.5;
side_rivet_gap = 1.5;

bayo_interf = 0.75;
bayo_behind = 3.5;
bayo_interf_width = 2.0;
bayo_interf_slope = 0.75;

seal_thick = 0.1;
seal_recess = [ 2.0, 2.0 ]; // recess depth, recess height

side_taper = 1.0;

bayo_above_gap = 1.0;

bayo_entry = bayo_behind/3;

bayo_slice_size = 1;

// calculated

bayo_entry_x = bayo_entry;
bayo_entry_z = bayo_entry;
bayo_inramp_x = bayo_entry;
bayo_inramp_z = bayo_entry;

side_height = rivet_posn + bayo_behind + rivet_thick/2;
side_thick = rivet_tall + over_rivet_wall;

top_z = top_thick + seal_thick;

bayo_entry = bayo_behind / 3.0;
bayo_top_z = bayo_behind + rivet_thick + bayo_above_gap;
bayo_entry_ramp = bayo_entry + bayo_interf;

rivet_entry_width = rivet_width + side_rivet_gap;

$fs=0.5;
$fa=1;

// bayonet definition

bayo_a = [ bayo_entry_x, 0 ];
bayo_p = [ 0, bayo_entry_z ];
bayo_n = [ 0, bayo_behind-bayo_inramp_z ];
bayo_m = [ bayo_inramp_x, bayo_behind ];
bayo_l = bayo_m + bayo_interf * [ 1/bayo_interf_slope,  1 ];
bayo_k = bayo_l + [ bayo_interf_width, 0 ];
bayo_j = bayo_k + bayo_interf * [ 1/bayo_interf_slope, -1 ];
bayo_i = bayo_j + [ rivet_width, 0 ];
bayo_h = [ bayo_i[0], bayo_behind + rivet_thick + bayo_above_gap ];
bayo_g = [ bayo_m[0] - rivet_width, bayo_h[1] ];

bayo_e = [-bayo_p[0], bayo_p[1]] - [rivet_entry_width,0];
bayo_d = [-bayo_a[0], bayo_a[1]] - [rivet_entry_width,0];
bayo_c = bayo_d + [0,-5];
bayo_b = bayo_a + [0,-5];

bayo_f = [ bayo_e[0], bayo_g[1] + (bayo_e[0] - bayo_g[0]) ];

bayo_polygon = [ bayo_a,
		 bayo_b,
		 bayo_c,
		 bayo_d,
		 bayo_e,
		 bayo_f,
		 bayo_g,
		 bayo_h,
		 bayo_i,
		 bayo_j,
		 bayo_k,
		 bayo_l,
		 bayo_m,
		 bayo_n,
		 bayo_p ];

echo(bayo_polygon);

module MainProfile(){
  main_cnr_pos = [ side_thick, top_z ] - [1,1]*main_cnr;
  translate(main_cnr_pos){
    intersection(){
      difference(){
	circle(r = main_cnr);
	circle(r = main_cnr * 0.5);
      }
      square([10,10]);
    }
  }
  polygon([[ -1,                    seal_thick        ],
	   [ -1,                    top_z             ],
	   [ main_cnr_pos[0],       top_z             ],
	   [ side_thick,            main_cnr_pos[1]   ],
	   [ side_thick,            -side_height      ],
	   [ side_taper,            -side_height      ],
	   [ 0,                     -rivet_posn       ],
	   [ 0,                     -(seal_recess[0] + seal_recess[1]) ],
	   [ seal_recess[0],        -(seal_recess[0]) ],
	   [ seal_recess[0],        seal_thick        ],
	   ]);
}

module RotateProjectSlice(offset, slice_size, nom_rad, real_rad){
  // nom_rad > real_rad
  rotate([0,0, atan2(offset, nom_rad) ]){
    intersection(){
      translate([-offset, -10, 0])
	rotate([90,0,0])
	linear_extrude(height= nom_rad*2)
	polygon(bayo_polygon);
      translate([0,0, -25])
	cylinder(h=50, r= real_rad);
      translate([0,0, -25])
	linear_extrude(height= 50)
	polygon([ [ 0,0 ],
		  [ -slice_size, -real_rad*2 ],
		  [ +slice_size, -real_rad*2 ] ]);
    }
  }
}

module RotateProject(x_min, x_max, slice_size, nom_rad, real_rad){
  offs = [ for (i=[ x_min :
		    slice_size :
		    x_max + slice_size ]) i ];
  echo (offs);
  for (off=offs)
    RotateProjectSlice(off, slice_size, nom_rad, real_rad);
}

module BayonetCutout(){
  RotateProject(bayo_c[0], bayo_i[0], bayo_slice_size,
		main_dia/2 + side_thick, 
		main_dia/2 + rivet_tall);
}

module ProfilesDemo(){
  translate([-20,0]) MainProfile();
  polygon(bayo_polygon);
}

//ProfilesDemo();
BayonetCutout();