--

-- ////\\\\

-- ////\\\\ TUTORIAL

-- ////\\\\ PART 5

-- \\\\////

-- \\\\//// OUTPUT

-- \\\\////

--

engine.name = 'OutputTutorial'

local viewport = { width = 128, height = 64, frame = 0 }

local focus = { x = 0, y = 0 }

-- Main

function init()

-- Render Style

screen.level(15)

screen.aa(0)

screen.line_width(1)

-- Center focus

reset()

-- Render

redraw()

end

function reset()

focus.x = viewport.width/2

focus.y = viewport.height/2

end

-- Interactions

function key(id,state)

reset()

redraw()

end

function enc(id,delta)

if id == 2 then

focus.x = clamp(focus.x + delta,6,123)

elseif id == 3 then

focus.y = clamp(focus.y + delta,6,59)

re.time = clamp(focus.y/viewport.height,0.05,4)

end

redraw()

end

-- Render

function draw_frame()

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

screen.stroke()

end

function draw_crosshair()

screen.move(focus.x,focus.y - 4)

screen.line(focus.x,focus.y - 2)

screen.move(focus.x - 4,focus.y)

screen.line(focus.x - 2,focus.y)

screen.move(focus.x,focus.y + 3)

screen.line(focus.x,focus.y + 1)

screen.move(focus.x + 3,focus.y)

screen.line(focus.x + 1,focus.y)

screen.stroke()

for i = viewport.width,1,-1 do

if i % 2 == 1 then

screen.move(i, focus.y)

screen.line(i + 1, focus.y)

end

end

for i = viewport.height,1,-1 do

if i % 2 == 1 then

screen.move(focus.x, i)

screen.line(focus.x, i + 1)

end

end

end

function draw_freq()

screen.move(5,viewport.height - (8 * 1))

screen.text(get_freq()..'hz')

screen.move(5,viewport.height - (8 * 2))

screen.text(clamp(focus.y/viewport.height,0.05,4)..'ms')

end

function redraw()

screen.clear()

draw_frame()

draw_crosshair()

draw_freq()

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 get_freq()

return ((focus.x/viewport.width) * 700) + 300

end

-- Interval

re = metro.init()

re.time = 0.5

re.event = function()

viewport.frame = viewport.frame + 1

engine.hz(get_freq())

end

re:start()