From 0a00f244e41222b00a55c10ba141c100fe7a7775 Mon Sep 17 00:00:00 2001
From: Martin Budden <mjbudden@gmail.com>
Date: Mon, 21 Dec 2020 23:28:39 +0000
Subject: [PATCH] Added dogbones with circles offset in x and y directions.

---
 tests/dogbones.scad |  6 ++++++
 utils/dogbones.scad | 32 +++++++++++++++++++++++++++++---
 2 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/tests/dogbones.scad b/tests/dogbones.scad
index 09b5bd0..4fa862a 100644
--- a/tests/dogbones.scad
+++ b/tests/dogbones.scad
@@ -26,6 +26,12 @@ module dogbones() {
     #translate([15, 0])
         dogbone_rectangle([10, 20, 5], center = false);
 
+    #translate([30, 0])
+        dogbone_rectangle_x([10, 20, 5], center = false);
+
+    #translate([45, 0])
+        dogbone_rectangle_y([10, 20, 5], center = false);
+
     sq = 3;
     translate([-5 + sq / 2 + eps, -10 + sq / 2 + eps])
         %cube([sq, sq, 1], center = true);
diff --git a/utils/dogbones.scad b/utils/dogbones.scad
index f5c3a04..c893545 100644
--- a/utils/dogbones.scad
+++ b/utils/dogbones.scad
@@ -23,24 +23,50 @@
 //
 include <../utils/core/core.scad>
 
-module dogbone_square(size, r = cnc_bit_r, center = true) //! Square with circles at the corners
+module dogbone(size, r, center, offset_x, offset_y) //! Dogbone utility module
 {
     union() {
         square(size, center = center);
 
         if(r > 0) {
             origin = center ? [0, 0] : size / 2;
-            offset = r / sqrt(2);
 
             for(x = [-1, 1], y = [-1, 1])
-                translate(origin + [x * (size.x / 2 - offset), y * (size.y / 2 - offset)])
+                translate(origin + [x * (size.x / 2 - offset_x), y * (size.y / 2 - offset_y)])
                     drill(r, 0);
         }
     }
 }
 
+module dogbone_square(size, r = cnc_bit_r, center = true) //! Square with circles at the corners
+{
+    dogbone([size.x, size.y], r, center, r / sqrt(2), r / sqrt(2));
+}
+
+module dogbone_square_x(size, r = cnc_bit_r, center = true) //! Square with circles at the corners, offset in the x direction
+{
+    dogbone([size.x, size.y], r, center, 0, r);
+}
+
+module dogbone_square_y(size, r = cnc_bit_r, center = true) //! Square with circles at the corners, offset in the y direction
+{
+    dogbone([size.x, size.y], r, center, r, 0);
+}
+
 module dogbone_rectangle(size, r = cnc_bit_r, center = true, xy_center = true) //! Rectangle with cylinders at the corners
 {
     extrude_if(h = size.z, center = center)
         dogbone_square([size.x, size.y], r, xy_center);
 }
+
+module dogbone_rectangle_x(size, r = cnc_bit_r, center = true, xy_center = true) //! Rectangle with cylinders at the corners, offset in the x direction
+{
+    extrude_if(h = size.z, center = center)
+        dogbone_square_x([size.x, size.y], r, xy_center);
+}
+
+module dogbone_rectangle_y(size, r = cnc_bit_r, center = true, xy_center = true) //! Rectangle with cylinders at the corners, offset in the y direction
+{
+    extrude_if(h = size.z, center = center)
+        dogbone_square_y([size.x, size.y], r, xy_center);
+}