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--
-- ////\\\\
-- ////\\\\ TUTORIAL
-- ////\\\\ PART 7
-- \\\\////
-- \\\\//// MIDI
-- \\\\////
--
engine.name = 'OutputTutorial'
local midi_signal_in
local midi_signal_out
local viewport = { width = 128, height = 64, frame = 0 }
-- Main
function init()
connect()
-- Render Style
screen.level(15)
screen.aa(0)
screen.line_width(1)
-- Render
redraw()
end
function connect()
midi_signal_in = midi.connect(1)
midi_signal_in.event = on_midi_event
midi_signal_out = midi.connect(2)
end
function on_midi_event(data)
msg = midi.to_msg(data)
play(msg)
redraw(msg)
end
function play(msg)
if msg.type == 'note_on' then
hz = note_to_hz(msg.note)
engine.amp(msg.vel / 127)
engine.hz(hz)
end
end
-- Interactions
function key(id,state)
if state == 1 and midi_signal_out then
midi_signal_out:note_on(60,127)
elseif midi_signal_ then
midi_signal_out:note_off(60,127)
end
redraw()
end
function enc(id,delta)
redraw()
end
-- Render
function draw_frame()
screen.level(15)
screen.rect(1, 1, viewport.width-1, viewport.height-1)
screen.stroke()
end
function draw_labels()
local line_height = 8
screen.level(1)
screen.move(5,viewport.height - (line_height * 1))
screen.text('note')
screen.move(5,viewport.height - (line_height * 2))
screen.text('ch')
screen.move(5,viewport.height - (line_height * 3))
screen.text('vel')
screen.move(5,viewport.height - (line_height * 4))
screen.text('type')
end
function draw_event(event)
local line_height = 8
screen.level(15)
if event.note then
screen.move(30,viewport.height - (line_height * 1))
screen.text(msg.note)
end
if event.ch then
screen.move(30,viewport.height - (line_height * 2))
screen.text(msg.ch)
end
if event.vel then
screen.move(30,viewport.height - (line_height * 3))
screen.text(msg.vel)
end
if event.type then
screen.move(30,viewport.height - (line_height * 4))
screen.text(msg.type)
end
end
function redraw(event)
screen.clear()
draw_frame()
draw_labels()
if event then
draw_event(event)
end
screen.stroke()
screen.update()
end
-- Utils
function clamp(val,min,max)
return val < min and min or val > max and max or val
end
function note_to_hz(note)
return (440 / 32) * (2 ^ ((note - 9) / 12))
end
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