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--
-- ////\\\\
-- ////\\\\ TUTORIAL
-- ////\\\\ PART 4
-- \\\\////
-- \\\\//// ANIMATION
-- \\\\////
--
local viewport = { width = 128, height = 64, frame = 0 }
local amplitude = 10
local rate = 10
-- Main
function init()
-- Render Style
screen.level(15)
screen.aa(0)
screen.line_width(1)
-- Center focus
reset()
-- Render
redraw()
end
function reset()
amplitude = 10
end
-- Interactions
function key(id,state)
reset()
redraw()
end
function enc(id,delta)
if id == 2 then
amplitude = clamp(amplitude + (delta/2),0,20)
else
rate = clamp(rate + (delta/10),2,20)
end
redraw()
end
-- Render
function draw_frame()
screen.rect(1, 1, viewport.width-1, viewport.height-1)
screen.stroke()
end
function draw_wave()
for i = 1,126 do
x = i
y = (math.sin((viewport.frame+i)/rate) * amplitude) + (viewport.height/2)
screen.pixel(x,y)
end
screen.fill()
end
function draw_label()
screen.move(5,viewport.height - (8 * 1))
screen.text(amplitude..':'..rate)
screen.stroke()
end
function redraw()
screen.clear()
draw_frame()
draw_wave()
draw_label()
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 = 1.0 / 15
re.event = function()
viewport.frame = viewport.frame + 1
redraw()
end
re:start()
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