// -*- C -*-

// xxx
bolt_above = 4;
wall_thick = 4;
bolthole_height = 4;
bolthole_width = 10;
base_thick = 5;
lidinner_thick_allow = 20;
space = 25;
anchor_thick = 4;
anchor_rad = 4;
bevel = 15;

// ----- calculated -----

gppA = [0,0];
gppB = gppA - [ wall_thick, 0 ];

gppL = [ gppB[0], -(lidinner_thick_allow + space + base_thick) ];

// anchor

anchor_b = anchor_thick + anchor_rad;
appM = gppL + anchor_b * [1,1];

a_bevel = 2 * anchor_b * (1 + sqrt(0.5));

module upp_app_Vars(t_bevel){
  $xppE = gppL + t_bevel * [0,1];
  $xppF = gppL + t_bevel * [1,0];

  $xppJ = $xppE + wall_thick * [ 1, tan(22.5) ];
  $xppI = $xppF + base_thick + [ tan(22.5), 1 ];

  children();
}

module upp_app_Profile(){
  polygon([ gppA,
	    gppB,
	    $xppE,
	    $xppF,
	    $xppF + [1,0],
	    $xppI + [1,0],
	    $xppJ ]);
}


module UsualProfile(){
  upp_app_Vars(bevel) upp_app_Profile();
}

module NearAnchorProfile(){
  upp_app_Vars(a_bevel) upp_app_Profile();
}

module AnchorProfile(){
  upp_app_Vars(a_bevel) {

    upp_app_Profile();

    difference(){
      hull(){
	polygon([ $xppE,
		  $xppF,
		  $xppF + [0,1],
		  $xppE + [1,0] ]);
	translate(appM) circle(r= anchor_b);
      }
      translate(appM) circle(r= anchor_rad);
    }
  }
}

module Demo(){
  color("red") AnchorProfile();
  translate([0,0,2]) color("black") NearAnchorProfile();
  color("blue") UsualProfile();
}

Demo();