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+-- 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