// -*- C -*-

cubez = 12;

shaftz = cubez;

//        shaftdia  recessdia
tests = [[2 + 0.5,   6 + 1.0,   0,  0 ],
	 [3 + 0.5,   9 + 1.0,   0, 10 ],
	 [4 + 0.5,  10 + 1.0,   0, 25 ],
	 [5 + 0.5,  10 + 1.0,  15,  5 ],
	 [6 + 0.5,  12 + 1.0,  15, 20 ]];

last_test = tests[len(tests)-1];

blockminx = -5;
blockminy = -5;
blockmaxx = 25;
blockmaxy = 20;

cubexy = 20;

module RecessScrewCutout_RecessCylinder(recessdia,zbelow, h){
  translate([0,0,-zbelow]) cylinder(r=recessdia/2, h=h+1, $fn=40);
}

RecessedScrewCutout_defaultrecessdepth_flat = -0.35;
RecessedScrewCutout_defaultrecessdepth_hex = -0.70;

function RecessedScrewCutout_recessdepth(recessdia, recessdepth_arg) =
  recessdepth_arg >= 0 ? recessdepth_arg : -recessdepth_arg * recessdia;

function RecessedScrewCutout_totaldepth(recessdia, recessdepth_arg) =
  RecessedScrewCutout_recessdepth(recessdia, recessdepth_arg) +
  + 0.5*recessdia + 0.1;

module RecessedScrewCutout(shaftdia, recessdia, shaftlen,
        zbelow=1,
        recessdepth_arg=RecessedScrewCutout_defaultrecessdepth_flat) {
  // pass recessdepth_arg=-1 for the default for flat heads
  // pass recessdepth_arg=-1 for the default for flat heads
  recessdepth = RecessedScrewCutout_recessdepth(recessdia, recessdepth_arg);
  recesstopz = RecessedScrewCutout_totaldepth(recessdia, recessdepth_arg);

  translate([0,0,-zbelow]) cylinder(r=shaftdia/2, h=shaftlen+zbelow, $fn=20);
  RecessScrewCutout_RecessCylinder(recessdia,zbelow, recessdepth);
  intersection(){
    cube([recessdia + 1, shaftdia + 0.1, recesstopz*2 + 1], center=true);
    translate([0, -recessdia, recesstopz])
      rotate([0,135,0]) cube([recessdia, recessdia*2, 10]);
    RecessScrewCutout_RecessCylinder(recessdia,zbelow, recesstopz+1);
  }
}

module Block(){
  translate([blockminx, blockmaxx, 0])
    cube([blockmaxx-blockminx, blockmaxy-blockminy, cubez]);
}

module Test(){
  difference(){
    Block();
    union(){
      for (t = tests) {
	RecessedScrewCutout(t[0],t[1], shaftz+1);
      }
    }
  }
}

module Holes(){
  for (t = tests) {
    translate([t[2], t[3], 0])
      RecessedScrewCutout(t[0],t[1], shaftz+1);
  }
}

module Demo(){
  Block();
  %Holes();
}

Demo();

//Test();
//Hole();
//Holes();