Created
February 4, 2013 16:24
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Notes in Codea
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-- 4 play | |
-- Use this function to perform your initial setup | |
function setup() | |
displayMode(FULLSCREEN) | |
createPitchTable() | |
parameter.integer("X", 1,10,1,play) | |
song = { | |
{x=100,n="e"}, | |
{x=200,n="g"}, | |
{x=300,n="c"}, | |
{x=500,n="E"}, | |
{x=600,n="G"}, | |
{x=700,n="C"}, | |
} | |
for i,v in ipairs(song) do | |
v.x = v.x * .8 | |
v.p = convertNoteToPitch(v.n) | |
v.data = sound(ENCODE, { | |
Waveform = SOUND_SINEWAVE, | |
StartFrequency = v.p | |
}) | |
end | |
end | |
function createPitchTable() | |
multiplier = 1.0296 | |
pitchTable = {1} | |
pitch = pitchTable[1] | |
semitoneModifier = 0 | |
gsNoteOrder = "CDEFGABcdefgab" | |
gsTonalSystem = "22122212212221" | |
-- There are 88 keys on a piano, so we will start from our highest note and go down. | |
-- We calculate the notes ourselves and put them in a table. | |
for i = 88, 1, -1 do | |
pitch = pitch / multiplier | |
table.insert(pitchTable,1,pitch) | |
end | |
end | |
function convertNoteToPitch(n) | |
semitoneModifier = 0 | |
gsNoteBeingPlayed = n | |
for j = 1, #gsNoteBeingPlayed do | |
local currentChar = string.sub(gsNoteBeingPlayed,j,j) | |
if currentChar == "_" then | |
semitoneModifier = semitoneModifier - 1 | |
end | |
if currentChar == "\^" then | |
semitoneModifier = semitoneModifier + 1 | |
currentChar = "%^" | |
end | |
-- NB need to implement naturals = | |
-- if the current char is a note | |
if string.find("abcdefg",string.lower(currentChar)) ~= nil then | |
-- modify octave | |
-- search through the next characters for , and ' | |
local nextCharIndex = 1 | |
local nextChar = string.sub(gsNoteBeingPlayed,j+nextCharIndex,j+nextCharIndex) | |
if nextChar == "," then | |
semitoneModifier = semitoneModifier - 12 | |
end | |
if nextChar == "'" then | |
semitoneModifier = semitoneModifier + 12 | |
end | |
pos = string.find(gsNoteOrder,currentChar) | |
local tonalModifier = string.sub(gsTonalSystem, 1, pos - 1) | |
for i = 1, #tonalModifier do | |
semitoneModifier = semitoneModifier + tonumber(string.sub(tonalModifier,i,i)) | |
end | |
end | |
end | |
pos = semitoneModifier + 44 | |
pitch = pitchTable[pos] | |
return pitch | |
end | |
function play() | |
local note = string.sub(gsNoteOrder,X,X) | |
print(note) | |
sound({ | |
Waveform = SOUND_SINEWAVE, | |
StartFrequency = convertNoteToPitch(note) | |
}) | |
end | |
-- This function gets called once y frame | |
function draw() | |
-- This sets a dark background color | |
background(40, 40, 50) | |
-- This sets the line thickness | |
strokeWidth(5) | |
-- Do your drawing here | |
local x =math.floor((ElapsedTime*WIDTH*.25)%WIDTH) | |
local hh = HEIGHT/2 | |
for i,v in ipairs(song) do | |
local s = 20 | |
if x > v.x then | |
local d = math.abs(x-v.x) | |
if d <400 then | |
s = s + d | |
else | |
s = math.max(20, s+(800-d)) | |
end | |
end | |
ellipse(v.x, v.p*1000, s) | |
if math.abs(x-v.x) < 5 then | |
sound(DATA, v.data) | |
end | |
end | |
stroke(219, 3, 245, 255) | |
line(x,0,x,HEIGHT) | |
end |
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