// -*- C -*-

include <funcs.scad>

ply_th = 18;
ply_hole_dia = 15;
ply_edge_min = 10;

tile_th = 3;
post_dia = 8;

post_shorter = 1;

screw_dia = 2.2;
screw_big_dia = 3.6;
screw_big_len = 4.0;

round_edge_rad = 2.0;

// calculated

ply_edge_hole_dist = ply_edge_min + ply_hole_dia/2;

echo(str("HOLES IN PLY ctr dist from edge = ", ply_edge_hole_dist));

hole_slop = (ply_hole_dia - post_dia)/2;
tile_hard_edge_hole_dist = ply_edge_hole_dist + hole_slop;
thehd = [ tile_hard_edge_hole_dist, tile_hard_edge_hole_dist ];

module Post(){
  mirror([0,0,1]) {
    difference(){
      cylinder(r= post_dia/2, h= tile_th + ply_th - post_shorter);
      translate([0,0, tile_th]) {
	cylinder(r= screw_big_dia/2, h= screw_big_len);
	cylinder(r= screw_dia/2, h= ply_th, $fn=20);
      }
    }
  }
}

module Posts(posts) {
  for (p= posts) {
    translate([p[0], p[1], 0])
      Post();
  }
}

module TileBase(botleft_post, topright_post){
  botleft = botleft_post - thehd;
  size = topright_post - botleft_post + thehd * 2;
  mirror([0,0,1])
    translate([botleft[0], botleft[1], 0])
    cube([size[0], size[1], tile_th]);
}

m4_dnl  INREFFRAME(left_post, right_post, morevars) { body; }
m4_define(`INREFFRAME',`
  length_vec = ($2) - ($1);
  length = dist2d([0,0], length_vec);
  length_uvec = length_vec / length;
  ortho_uvec = [ -length_uvec[1], length_uvec[0] ];
  m = [ [ length_uvec[0],  ortho_uvec[0], 0, ($1)[0], ],
	[ length_uvec[1],  ortho_uvec[1], 0, ($1)[1], ],
	[ 0,              0,              1,            0, ],
	[ 0,              0,              0,            1, ] ];
  $3
  multmatrix(m)
  translate([-thehd[1], -thehd[0], -round_edge_rad])
')

module RoundEdge(left_post, right_post) {
  INREFFRAME(left_post, right_post,
	      `tlength = length + thehd[1] * 2;') { m4_dnl '
    difference(){
      rotate([0,90,0])
	cylinder(r= round_edge_rad, h= tlength, $fn=50);
      translate([-1, 0, -20])
	cube([tlength+2, 20, 20]);
    }
  }
}

module RoundLeftCorner(this_post, right_post) {
  INREFFRAME(this_post, right_post){
    difference(){
      sphere(r= round_edge_rad, $fn=60);
      translate([0,0, -20])
	cube([20,20,20]);
    }
  }
}

module InterlockNegative(this_post, right_post) {
}

module TestPiece1(){
  holes = [ [-100, 0],
	    [   0, 0]
	    ];
  difference(){
    TileBase(holes[0], holes[1]);
    InterlockNegative(holes[1], holes[1] + [0,1]);

  }
  Posts(holes);
  RoundEdge(holes[0], holes[1]);
  RoundEdge(holes[0] + [ 0, 0.1 ], holes[0]);
  RoundLeftCorner(holes[0], holes[1]);
}

TestPiece1();