From 57fbc2997fe22b3bea50b9ddda168e644ebfae37 Mon Sep 17 00:00:00 2001
From: Adam Goldsmith <adam@adamgoldsmith.name>
Date: Mon, 11 Jun 2018 21:25:43 -0400
Subject: [PATCH] Add some notes

---
 HPGLWrap.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/HPGLWrap.py b/HPGLWrap.py
index 83d1285..ede3587 100755
--- a/HPGLWrap.py
+++ b/HPGLWrap.py
@@ -4,6 +4,12 @@ import os
 import re
 import sys
 
+# Based off of notes from
+# https://github.com/fellesverkstedet/gcc-laserpro-driver
+# and http://www.wiki.cl.cam.ac.uk/rowiki/CompArch/HardwareLab/LaserCutter
+# and src/core/path_gcc.c from
+# https://github.com/fellesverkstedet/fabmodules
+
 def write_pen_values(values, char):
     return "!v64" + char + "".join(["{:04d}".format(value) for value in values])
 
@@ -32,7 +38,7 @@ def pre_content(filename, power, speed, rate, pen_settings):
 
     # Select first (and only) pen (commented out in original source)
     # outString += "!v1D"
-    # outString += "!m2A" # might cause autofocus?
+    # outString += "!m2A" # triggers autofocus
 
     # Use same value for all 16 pens
     # doesn't seem to affect vector settings
@@ -52,6 +58,7 @@ def set_vector_pens(content, pen_settings):
             power=pen_settings['power'][num],
             speed=pen_settings['speed'][num],
             penNum=num+1) for num in range(0, 16)])
+    # TODO: find out why slow movement in PU (pen up) until first PD (pen down)
     content = re.sub(
         "FS\d{1,4};VS\d{1,4};SP1;",
         settings + "SP1;",