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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
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