// -*- C -*-

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("HOLES IN PLY ctr dist from edge = "+str(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);
      }
    }
  }
}

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]);
}

module RoundEdge(left_post, right_post) {
  length_vec = right_post - left_post;
  ortho_vec = [ -length_vec[1], length_vec[0] ] / dist2d(length_vec);
  multmatrix([ [ length_vec[0],  length_vec[1], 0, left_post[0], ],
	       [ otho_vec[0],    ortho_vec[1],  0, left_post[1], ],
	       [ 0,              0,             1,            0, ],
	       [ 0,              0,             0,            1, ] ]) {
    translate([0, -tile_hard_edge_hole_dist, -round_edge_rad]){
      difference(){
	rotate([0,90,0])
	  cylinder(r= round_edge_rad, h= 1.0);
	translate([-1, 0, -20])
	  cube([3, 20, 20]);
      }
    }
  }
}

module RoundLeftCorner(this_post, right_post) {
}

module TestPiece1(){
  holes = [ [-100, 0],
	    [   0, 0]
	    ];
  TileBase(holes[0], holes[1]);
  Posts(holes);
  RoundEdge(holes[0], holes[1]);
  RoundLeftCorner(holes[0], holes[1]);
}

TestPiece1();