From 995db8a8a516a9c494d3b415fc0e2ce2238e38f5 Mon Sep 17 00:00:00 2001
From: Sandy Noble <sandy.noble@gmail.com>
Date: Sun, 28 Oct 2018 15:18:33 +0000
Subject: [PATCH 1/3] Addition to support gcode without Z codes

---
 FileLoading.pde | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/FileLoading.pde b/FileLoading.pde
index b8217a2..73a7bfb 100644
--- a/FileLoading.pde
+++ b/FileLoading.pde
@@ -322,6 +322,9 @@ RShape loadShapeFromGCodeFile(String filename) {
             drawLine = false;
           }
         }
+        else { //  if there is no Z axis, assume it's always on
+//          drawLine = true; // this isn't always safe!
+        }        
         
         Float x = ins.get("X");
         Float y = ins.get("Y");

From 417c18fec73fed9b756a4b6005881a868a1cd22e Mon Sep 17 00:00:00 2001
From: Sandy Noble <sandy.noble@gmail.com>
Date: Mon, 5 Nov 2018 21:36:13 +0000
Subject: [PATCH 2/3] Add try/catch around the previewQueue(). Fixes #19

---
 polargraphcontroller.pde | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/polargraphcontroller.pde b/polargraphcontroller.pde
index c6a8a54..9508df1 100644
--- a/polargraphcontroller.pde
+++ b/polargraphcontroller.pde
@@ -843,8 +843,17 @@ void drawImagePage()
 
   showGroupBox();
   showCurrentMachinePosition();
-  if (displayingQueuePreview)
-    previewQueue();
+
+  try {
+    if (displayingQueuePreview)
+      previewQueue();
+  }
+  catch (ConcurrentModificationException cme)
+  {
+    // not sure why this prompts an exception. Will revisit this another day.
+    println("Caught CME coming from previewQueue(): " + cme.getMessage());
+  }
+
   if (displayingInfoTextOnInputPage)
     showText(250,45);
   drawStatusText((int)statusTextPosition.x, (int)statusTextPosition.y);

From dba2788d1ffa6537de29499e80edfe858f545a53 Mon Sep 17 00:00:00 2001
From: Sandy Noble <sandy.noble@gmail.com>
Date: Tue, 12 Mar 2019 20:50:46 +0000
Subject: [PATCH 3/3] Added link to the instructions for building from source.

---
 README.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README.md b/README.md
index 6c68d9e..e51a596 100644
--- a/README.md
+++ b/README.md
@@ -13,5 +13,7 @@ This is a desktop application for controlling a polargraph machine, communicatin
 The [latest releases bundle] (https://github.com/euphy/polargraphcontroller/releases/latest) contains 
 copies of all the libraries that I use, as well as all the source, and compiled versions of the code where sensible.
 
+How to [run it from source](https://github.com/euphy/polargraph/wiki/Running-the-controller-from-source-code).
+
 sandy.noble@gmail.com
 http://www.polargraph.co.uk/