From b7816f485ca65d49bb183fd7be752f0f7674fae8 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sat, 9 Sep 2017 16:02:30 +0100
Subject: [PATCH] sprinkler-spike-receptacle: wip

---
 sprinkler-spike-receptacle.scad | 36 +++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 sprinkler-spike-receptacle.scad

diff --git a/sprinkler-spike-receptacle.scad b/sprinkler-spike-receptacle.scad
new file mode 100644
index 0000000..2c8534f
--- /dev/null
+++ b/sprinkler-spike-receptacle.scad
@@ -0,0 +1,36 @@
+// -*- C -*-
+
+main_height = 95;
+
+spike_top_width = 21.04;
+
+spike_botpos_height = 9.5;
+spike_botpos_width = 11.68;
+
+topwall_width = 1.5;
+
+module NegativePlan(){
+  x4z =
+    (spike_top_width - spike_botpos_width) /
+    (main_height - spike_botpos_height);
+
+  x0 = (spike_botpos_width - x4z * spike_botpos_height)/2;
+  x1 =  spike_top_width/2;
+  z1 = main_height;
+
+  polygon([[ x0, -5],
+	   [ x0, 0],
+	   [ x1, z1],
+	   [-x1, z1],
+	   [-x0, 0],
+	   [-x0, -5]]);
+}
+
+module PositivePlan(){
+  w = spike_top_width + topwall_width*2;
+  translate([ -w/2, 0 ])
+    square([ w, main_height ]);
+}
+
+PositivePlan();
+//NegativePlan();  
-- 
2.30.2