// -*- C -*-

cover_ysz = 45;
cover_len = 70;

attach_tube_dia = 18;

attach_cx = -15;
attach_cdy = -10;
attach_w = 25;

attach_inrad = 25; ///
attach_hole_dist = 5; ///
attach_hole_dia = 4 + 0.5; ///
attach_ang = 45;

// calculated

cover_lcircle_r = cover_ysz / (1 + 1/sqrt(2));

base_len = cover_len - cover_lcircle_r;

attach_total_len =
  attach_inrad + attach_tube_dia + attach_hole_dist + attach_hole_dia/2;

module RearSideTemplate(){
  polygon([[0.1,0],
	   [-base_len,0],
	   [-base_len,-cover_ysz],
	   [0.1,      -cover_ysz]]);
  translate([-base_len, -cover_ysz + cover_lcircle_r])
    circle(r=cover_lcircle_r);
}

module AttachTemplate(){
  hull(){
//    polygon([[0,   0],
//	     [-0.1, 0],
//	     [-0.1, -cover_ysz],
//	     [0,    -cover_ysz]]);
    translate([attach_cx, -attach_cdy]) rotate([0,0,-attach_ang]) {
      polygon([[-attach_cx,       attach_w/2],
	       [0,                -attach_w/2],
	       [attach_total_len, -attach_w/2],
	       [attach_total_len, attach_w/2]]);
      translate([attach_total_len, 0])
	circle(r=attach_w/2);
    }
  }
}

//module Tube(){
//  translate(

color("blue") RearSideTemplate();
AttachTemplate();