--

-- ////\\\\

-- ////\\\\ TUTORIAL

-- ////\\\\ PART 6

-- \\\\////

-- \\\\//// INPUT

-- \\\\////

--

engine.name = 'InputTutorial'

local viewport = { width = 128, height = 64 }

local signal = { amp_in_l = 0, amp_out_l = 0, amp_in_l_max = 0, amp_out_l_max = 0 }

local controls = { amp = 1.0 }

local refresh_rate = 1.0 / 15

local p_amp_in

local p_amp_out

function init()

-- Render Style

screen.level(15)

screen.aa(0)

screen.line_width(1)

-- Render

redraw()

-- Listen

audio.monitor_mono()

engine.amp(1.0)

-- Poll in

p_amp_in = poll.set("amp_in_l")

p_amp_in.time = refresh_rate

p_amp_in.callback = function(val)

signal.amp_in_l = val

if signal.amp_in_l > signal.amp_in_l_max then

signal.amp_in_l_max = signal.amp_in_l

end

end

-- Poll out

p_amp_out = poll.set("amp_out_l")

p_amp_out.time = refresh_rate

p_amp_out.callback = function(val)

signal.amp_out_l = val

if signal.amp_out_l > signal.amp_out_l_max then

signal.amp_out_l_max = signal.amp_out_l

end

end

end

function update()

engine.amp(controls.amp)

redraw()

end

function repoll()

p_amp_in:update()

p_amp_out:update()

end

-- Controls

function key(id,state)

if state == 0 then return end

if id == 2 or id == 3 then

if controls.amp == 1 then

controls.amp = 0

else

controls.amp = 1

end

end

update()

end

function enc(id,delta)

controls.amp = clamp(controls.amp + (delta/10), 0.1, 1)

update()

end

-- Render

function draw_frame()

screen.level(15)

screen.rect(1, 1, viewport.width-1, viewport.height-1)

screen.stroke()

end

function draw_uv(value,maximum,offset)

size = {width = 4, height = viewport.height - 4}

pos = {x = viewport.width - size.width - offset, y = 2}

ratio = value/maximum

activity = clamp(size.height - (ratio * size.height),3,size.height)

screen.line_width(size.width)

-- Draw

screen.level(1)

screen.move(pos.x,pos.y)

screen.line(pos.x,pos.y + size.height)

screen.stroke()

screen.level(15)

screen.move(pos.x,pos.y + size.height)

screen.line(pos.x,activity)

screen.stroke()

screen.line_width(1)

end

function draw_controls()

x = viewport.width - 16

y = math.floor(viewport.height-(controls.amp * (viewport.height-5)) - 2)

-- Draw

screen.level(15)

screen.line_width(1)

screen.move(x,y)

screen.line(x + 4,y)

screen.stroke()

end

function draw_label()

line_height = 8

screen.move(5,viewport.height - (line_height * 1))

screen.text(controls.amp..'amp')

end

function redraw()

screen.clear()

draw_frame()

draw_controls()

draw_label()

draw_uv(signal.amp_in_l,signal.amp_in_l_max,0)

draw_uv(signal.amp_out_l,signal.amp_out_l_max,5)

screen.stroke()

screen.update()

end

-- Utils

function clamp(val,min,max)

return val < min and min or val > max and max or val

end

-- Interval

re = metro.init()

re.time = refresh_rate

re.event = function()

repoll()

redraw()

end

re:start()