From d63b0d35fb22baa15c833dedbd54c971c62fee5b Mon Sep 17 00:00:00 2001
From: Paul Hedderly <paul+github@.mjr.org>
Date: Wed, 13 Jan 2021 08:18:01 +0000
Subject: prh: lua example to turn a trackpad into a numberpad and trigger
 swipes and gestures

---
 configs/trackpad.lua | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 configs/trackpad.lua

diff --git a/configs/trackpad.lua b/configs/trackpad.lua
new file mode 100644
index 0000000..0aa9de7
--- /dev/null
+++ b/configs/trackpad.lua
@@ -0,0 +1,59 @@
+-- Trackpad input by Paul Hedderly
+-- Expects three sources X, Y and touch
+-- On the Korg Nanopad2 these would be nanoP.ch0.cc1, nanoP.ch0.cc2, nanoP.ch0.cc16
+-- so you could map and feed this script with something like:
+--	[midi nanoP]
+--	read = nanoPAD2
+--	write = nanoPAD2
+--	[lua trackpad]
+--	script = trackpad.lua
+-- ..	
+--	nanoP.ch0.cc1 > trackpad.x
+-- 	nanoP.ch0.cc2 > trackpad.y
+-- 	nanoP.ch0.cc16 > trackpad.touch
+--
+-- Each touch will generate four outputs
+-- - on[1-9] - the first point of touch (might not be very useful!)
+-- - off[1-9] - the final point of touch
+-- - swipe[1-9][1-9] - the first and last as a *simple* gesture or swipe
+-- - gesture[1-9]..[1-9] - every segment you touch in order so you can do complicated gestures
+--
+-- Each output of 1 is followed by an output of 0
+-- You would map these as
+-- 	trackpad.on3 > ...
+-- 	trackpad.off9 > ....
+-- 	trackpad.swipe17 > .... -- would catch a line from top left to bottom left but could go anywhere in between
+-- 	trackpad.gesture78965 > .... would catch a backwards capital L starting at the bottom left
+
+-- -- Reserve state variables
+contact=0;
+trace="";
+x=0; y=0
+lpos=""
+
+function x(v) -- NOTE the code assumes that we get an X before the Y - Some devices might differ!
+	x=math.floor((v+0.09)*2.55)
+end
+
+function y(v)
+	y=2-math.floor((v+0.09)*2.55)	-- 2- so that we have 1 at the top
+	pos=""..x+1+y*3 			-- we need a string to compare
+	lpos=string.sub(trace,-1)
+	print("pos"..pos.." lpos"..lpos.." = "..trace)
+	if pos ~= lpos then trace=trace..pos end
+end
+
+function touch(v)
+	--  print("TOUCH .."..contact..".... trace"..trace)
+	if v==1 then contact=1
+	elseif v==0 then 
+		first=string.sub(trace,1,1); last=string.sub(trace,-1)
+		ends=first..last
+		output("on"..last,1); output ("on"..last,0)
+		output("off"..last,1); output ("off"..last,0)
+		output("swipe"..ends,1); output ("swipe"..ends,0)
+		output("gesture"..trace,1); output ("gesture"..trace,0)
+		print("TRACKPAD>>>"..trace.." ends.."..ends)
+		trace="" -- reset tracking
+	end;
+end
-- 
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